Abaqus Truss Analysis Lecture 1 | 2D Three Member Plane Truss | Deflections and Support Reactions

00:30:03
https://www.youtube.com/watch?v=XwSeMeOnUlU

摘要

TLDRThis video tutorial provides a detailed guide to performing a plain truss analysis using Abaqus CAE. The tutorial begins with the setup of units, emphasizing that Abaqus does not default to specific units, requiring users to specify their own based on the problem requirements. The example involves a steel truss with a modulus of elasticity of 200 GPa and a cross-sectional area of 2300 mm². The procedure covers the steps of creating parts, materials, sections, meshing the model, applying boundary conditions, and executing a static load analysis. Users are guided through creating job submissions, running the simulation, and visualizing results including deflections, stresses, and reaction forces. The tutorial stresses the importance of setting a work directory and describes how to generate reports from simulations to analyze forces, especially axial forces, which require manual calculation from stress results.

心得

  • 🔧 Understand the setup process in Abaqus CAE for truss analysis.
  • 📏 Manage units effectively as Abaqus does not default to specific units.
  • 🧱 Create materials and sections with proper mechanical properties.
  • 🔍 Mesh the model with appropriate element distribution.
  • 📂 Set up boundary conditions and apply static loads.
  • ✔️ Run job submissions and check data consistency.
  • 📊 Visualize analysis results and generate detailed reports.
  • 🖋️ Manual calculation is needed for extracting axial forces.
  • 📁 Save models and results systematically in a work directory.
  • ⚙️ Field output modification for specific analysis needs.
  • 💾 Export analysis results for further processing.
  • ✅ Validate Abaqus results against theoretical examples.

时间轴

  • 00:00:00 - 00:05:00

    The video introduces a tutorial on Plain Cross analysis using Abacus CAE, focusing on a three-member truss made of steel with specified properties such as elasticity, Poisson's ratio, and cross-sectional area. Objectives include determining joint reactions, normal stresses, and axial forces under load. The example is from a textbook on finite element analysis.

  • 00:05:00 - 00:10:00

    The tutorial emphasizes the importance of setting correct units in Abacus and establishing a work directory. It follows steps starting with creating a part as a 2D deformable wire. The speaker outlines how to sketch lines for the truss and proceed with defining material properties such as elasticity and Poisson's ratio, specifically for steel.

  • 00:10:00 - 00:15:00

    The process continues with creating a section for the truss, setting cross-sectional properties, assigning sections, and beginning the meshing process. The tutorial details choosing the mesh size, number of elements for truss nodes, and assigning element types, emphasizing standard practices for accuracy in results.

  • 00:15:00 - 00:20:00

    After meshing, the tutorial moves to the assembly module to create an instance of the truss and define steps for simulation, choosing static load procedures. The speaker explains modifying field output for capturing necessary data like stresses and displacements, preparing for load application and boundary conditions setup.

  • 00:20:00 - 00:25:00

    Boundary conditions such as simple and roller supports are set. Next, an analysis job is created with steps to check for data integrity, followed by submitting the job. Visualization in Abacus includes checking deflections, stresses, and ensuring data alignment with theoretical examples from literature.

  • 00:25:00 - 00:30:03

    Final steps encompass exporting results to analyze forces and ensure correct model behavior compared to theoretical stress and reaction forces. The tutorial reinforces that while stress and reaction outputs are direct, member axial forces require additional calculation, covering comprehensive steps from modeling to analysis across three main phases.

显示更多

思维导图

Mind Map

常见问题

  • What materials are used in the tutorial truss example?

    The truss members are made of steel with a modulus of elasticity of 200 GPa and a Poisson's ratio of 0.3.

  • What software tools are discussed in this tutorial?

    The tutorial uses Abaqus CAE and Matlab for finite element analysis.

  • What are the dimensions and properties of the truss members?

    Each member has a cross-sectional area of 2300 mm². Dimensions are converted from meters to millimeters.

  • How are units handled in Abaqus?

    Abaqus does not have a defined set of units, so users must consistently select and apply units throughout the analysis.

  • What analysis setup steps are highlighted in this tutorial?

    Key steps include creating parts, materials, sections, meshing, assigning loads and boundary conditions, and running simulation jobs.

  • What is the main objective of this tutorial?

    To perform a plain truss analysis, determine deflections, stresses, reaction forces, and axial forces of a steel truss using Abaqus CAE.

  • How can axial forces be calculated in this example?

    Axial forces must be manually calculated by multiplying axial stresses (S11) by the cross-sectional area.

  • What does the process of creating a report in Abaqus involve?

    Reports for variable outputs such as displacements, stresses, and reaction forces can be generated and exported for further analysis.

  • Why is it important to set the work directory in Abaqus?

    The work directory is where models and results are saved, ensuring organized file management during analysis.

  • What steps are needed to visualize results in Abaqus?

    Users can visualize nodal displacements, reaction forces, and stress contours in the viewport and generate reports for detailed analysis.

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  • 00:00:00
    hello everyone here
  • 00:00:04
    this video tutorial is Plain Cross
  • 00:00:06
    analysis in Abacus CAE
  • 00:00:10
    plus is a three member
  • 00:00:14
    as shown in the figure so that is a
  • 00:00:16
    plane press all members are made from
  • 00:00:19
    steel with the modulus of elasticity 200
  • 00:00:21
    Giga Pascal
  • 00:00:23
    Python's ratio of 0.3 and
  • 00:00:24
    cross-sectional area of each member
  • 00:00:27
    is 2300 millimeter square
  • 00:00:31
    she determine the fraction of each joint
  • 00:00:34
    normal stresses for each member reaction
  • 00:00:36
    at each sport and axial force in each
  • 00:00:40
    member under loading condition
  • 00:00:44
    this truss is a work example from
  • 00:00:47
    chapter 2 bar elements introduction to
  • 00:00:49
    finite element analysis using Matlab and
  • 00:00:52
    abacus
  • 00:00:53
    so this is a book introduction to finite
  • 00:00:56
    element analysis using Matlab and abacus
  • 00:01:01
    that is chapter 2
  • 00:01:03
    and this one this is a work example
  • 00:01:08
    here you can see this is a work example
  • 00:01:10
    and I'll use results from this example
  • 00:01:15
    to verify
  • 00:01:17
    like as here you can see that the
  • 00:01:19
    reaction forces they are
  • 00:01:21
    here and then deflections are given so
  • 00:01:27
    and then member forces are here so these
  • 00:01:30
    are the member forces
  • 00:01:32
    so
  • 00:01:34
    the results from here so
  • 00:01:37
    they will be used to verify
  • 00:01:40
    Abacus modeling three main straps
  • 00:01:43
    in
  • 00:01:45
    analysis in a backup caes the first one
  • 00:01:48
    is modeling then analysis and then
  • 00:01:50
    results and these are the highlights
  • 00:01:52
    so create a part create material create
  • 00:01:55
    section assign element
  • 00:01:58
    assign section create mesh create
  • 00:02:00
    instance create step modify field output
  • 00:02:03
    create load create boundary condition
  • 00:02:05
    create job and then run the job and
  • 00:02:08
    finally visualize results
  • 00:02:10
    for displacement stresses reaction
  • 00:02:13
    forces and then to calculate member
  • 00:02:16
    forces so these the these are straps
  • 00:02:19
    which I'll follow one by one for
  • 00:02:21
    starting you need to make sure that you
  • 00:02:24
    have correct set of units because
  • 00:02:26
    Abacus doesn't have any set of unit so
  • 00:02:30
    you have to select your own unit the
  • 00:02:32
    units may be Newton meter Pascal or
  • 00:02:35
    Newton millimeter Mega Pascal or Newton
  • 00:02:38
    per millimeter square so you need to set
  • 00:02:40
    your own System of Units based on
  • 00:02:43
    stresses loads and
  • 00:02:46
    dimensions
  • 00:02:48
    so in this problem
  • 00:02:50
    dimensions are in
  • 00:02:53
    meters areas they are in millimeters and
  • 00:02:57
    stresses are in Pascal
  • 00:02:59
    so
  • 00:03:01
    for this problem I am going to set
  • 00:03:03
    dimensions
  • 00:03:04
    in millimeters so I need to convert that
  • 00:03:07
    meters into millimeter so that is very
  • 00:03:10
    simple 4000 millimeter 6000 millimeter
  • 00:03:14
    and then because area is in millimeter
  • 00:03:18
    and then poisons ratio is a unitless and
  • 00:03:20
    modulus of elasticity 200 gigapascal so
  • 00:03:23
    that will go 220 raised per 3 mega
  • 00:03:26
    Pascal or 200 race but 3 Newton per
  • 00:03:29
    millimeter square I am going to use here
  • 00:03:31
    Newton millimeter Mega Pascal or Newton
  • 00:03:34
    per millimeter square
  • 00:03:35
    the next one you need to set a work
  • 00:03:37
    directory so work directory you need to
  • 00:03:39
    set where you want to save your model
  • 00:03:42
    and we want to save all your results
  • 00:03:46
    so here I have abacus
  • 00:03:50
    CAE 2020 so the first step is to file
  • 00:03:54
    and set work directory that is a folder
  • 00:03:57
    plain trust three member I want to save
  • 00:04:02
    all model and results here so just copy
  • 00:04:05
    it from here and then paste there
  • 00:04:11
    and okay so in our work directory is
  • 00:04:13
    being set and I'm going to save that
  • 00:04:15
    model
  • 00:04:18
    plane trust remember and okay so now it
  • 00:04:22
    is being saved
  • 00:04:23
    step now is to create part and it is 2D
  • 00:04:27
    deformable wire
  • 00:04:28
    an approximate size need to keep at 2
  • 00:04:31
    times maximum length and then create
  • 00:04:34
    lines connected so that these are the
  • 00:04:36
    steps so I'll go here so now you have
  • 00:04:40
    three options here
  • 00:04:42
    using tabs here you can create a part
  • 00:04:45
    then in the module need to
  • 00:04:48
    click here to create a part or you have
  • 00:04:50
    in model tree you have double click to
  • 00:04:53
    create part
  • 00:04:54
    okay so part is 2D deformable wire and
  • 00:04:58
    approximate size will be maximum
  • 00:05:00
    Dimension so the maximum Dimension is
  • 00:05:02
    6000 Times by 2 so if I add there twelve
  • 00:05:06
    thousands is not going to add because
  • 00:05:08
    the maximum it is going to take as 10
  • 00:05:11
    000
  • 00:05:12
    and I named that as cross so plain truss
  • 00:05:16
    and now need to sketch
  • 00:05:19
    and here you are 2D deformable wire
  • 00:05:24
    so and then you need to
  • 00:05:27
    create lines connected lines so
  • 00:05:29
    here you can use that connected line so
  • 00:05:32
    I am going to draw the first diagonal
  • 00:05:34
    line so you have two options here
  • 00:05:38
    either you can enter here the values
  • 00:05:40
    like as origin 0 0 that is the starting
  • 00:05:43
    point and then the ending point is four
  • 00:05:46
    thousand and six thousand
  • 00:05:51
    so now you can see you have here first
  • 00:05:55
    line and then you can use Mouse for the
  • 00:05:59
    other ones and mouse will use to zoom in
  • 00:06:02
    or zoom out so that is a second
  • 00:06:04
    connected line and then that is the
  • 00:06:06
    third connected line and you can see
  • 00:06:08
    that there is H on it so it shows that
  • 00:06:10
    is a horizontal so once it's done then
  • 00:06:12
    you need to cancel procedure
  • 00:06:15
    and then here
  • 00:06:17
    sketch the section for the wire so it is
  • 00:06:20
    done
  • 00:06:21
    so now you can see that part is being
  • 00:06:23
    created so that is a truss
  • 00:06:25
    so and here you can see that
  • 00:06:29
    that part is being created
  • 00:06:31
    next step is to create material and the
  • 00:06:36
    other material elastic type isotropic
  • 00:06:38
    and need to add modulus of elasticity
  • 00:06:40
    and poisons ratio
  • 00:06:42
    so here
  • 00:06:44
    you have option three options there
  • 00:06:47
    so either you can here click on the
  • 00:06:51
    material that's the first option or here
  • 00:06:54
    using module property you can create a
  • 00:06:56
    material here or otherwise you have here
  • 00:07:00
    material so create a material
  • 00:07:04
    okay so material name I am going to name
  • 00:07:07
    it as Steel
  • 00:07:08
    and then here you have mechanical
  • 00:07:10
    elasticity
  • 00:07:12
    and then elastic
  • 00:07:15
    need to add modulus of elasticity which
  • 00:07:18
    is 200 e raised per three uh Mega Pascal
  • 00:07:22
    or Newton per millimeter square and the
  • 00:07:24
    poisons ratio is 0.3
  • 00:07:27
    so here you can add the values
  • 00:07:30
    okay
  • 00:07:32
    and then you can see here the material
  • 00:07:34
    is created so that material is created
  • 00:07:37
    next step is create section and the
  • 00:07:41
    category is beam type is to us and need
  • 00:07:43
    to add cross-sectional area
  • 00:07:45
    so to create section so you have here
  • 00:07:50
    again in the property module you can
  • 00:07:53
    click here to create section or you have
  • 00:07:55
    option here to create section or in the
  • 00:07:58
    model tree you have section here so just
  • 00:08:01
    double click on it and section
  • 00:08:05
    is beam type is for us I'm going to name
  • 00:08:09
    it as truss so continue
  • 00:08:11
    and then here material is steel and you
  • 00:08:15
    need to add cross sectional area which
  • 00:08:17
    is 2300 millimeter squared
  • 00:08:20
    and click ok
  • 00:08:22
    and now you can see a section has been
  • 00:08:25
    created with cross step using property
  • 00:08:28
    module you can assign section and you
  • 00:08:30
    need to select region and then select
  • 00:08:34
    section
  • 00:08:35
    so you have options here you can go here
  • 00:08:39
    and then assign section or you can hear
  • 00:08:43
    assign section
  • 00:08:45
    okay and now it asks you here select the
  • 00:08:49
    region to be sign section so I'm not
  • 00:08:51
    going to create any set and then I'm
  • 00:08:53
    going to select whole of this region and
  • 00:08:56
    it says done and then here is a cross
  • 00:09:01
    and okay and here done so now section
  • 00:09:07
    has been assigned to trust that is your
  • 00:09:11
    trust the section has been assigned
  • 00:09:15
    next step is to create mesh and here's
  • 00:09:18
    the seed Edge by number number should be
  • 00:09:20
    one then mesh part assign element type
  • 00:09:24
    so here you have again options
  • 00:09:27
    you can
  • 00:09:29
    here go to property module and then you
  • 00:09:33
    can mesh it or here you can create mesh
  • 00:09:38
    or otherwise you have here in the model
  • 00:09:40
    tree so you can create mesh
  • 00:09:42
    and then when you select create mesh
  • 00:09:45
    then you have here seed edges option so
  • 00:09:48
    I'm going to select CJ three digits
  • 00:09:51
    and then hit say that select the region
  • 00:09:54
    to be assigned local seed so I am going
  • 00:09:57
    to select whole of this region done and
  • 00:10:00
    then it gives you option
  • 00:10:02
    so mesh by number and then number of
  • 00:10:06
    elements you need to select as one
  • 00:10:08
    because in theory there must be one
  • 00:10:10
    element between nodes
  • 00:10:13
    for truss elements so then I'll apply
  • 00:10:17
    OK and then the next one here you have
  • 00:10:21
    option of mesh part so mesh part here
  • 00:10:25
    you can it says that okay to mesh part
  • 00:10:27
    so yes
  • 00:10:28
    and then here you have a sine element
  • 00:10:31
    type it says that select the region to
  • 00:10:34
    be a sign element type so I am going to
  • 00:10:36
    select whole of that
  • 00:10:38
    and then done and now I have options
  • 00:10:42
    here
  • 00:10:43
    so family in the family I need to select
  • 00:10:47
    for us then element Library standard
  • 00:10:50
    geometric order standard and then it is
  • 00:10:52
    the TD t2d2 and 2 node linear 2D Truss
  • 00:10:58
    and then I'll select OK and then done so
  • 00:11:01
    now it's being matched next step in the
  • 00:11:05
    assembly mode you will need to create
  • 00:11:06
    instance or create instance from parts
  • 00:11:08
    and need to select parts so again you
  • 00:11:11
    have here option so here you can go
  • 00:11:15
    in assembly module and create instance
  • 00:11:19
    there or you have here in create
  • 00:11:22
    instance or otherwise in the model tree
  • 00:11:25
    so you can go and create instance so I
  • 00:11:28
    am going to start from here so click and
  • 00:11:31
    then it says that create instance from
  • 00:11:34
    truss part so I'm just going to select
  • 00:11:36
    OK and then here in the assembly you can
  • 00:11:40
    see that plane truss is here so that
  • 00:11:44
    instance is being created is to create
  • 00:11:46
    step so step means that which type of
  • 00:11:48
    load you want to apply and procedure
  • 00:11:50
    type is general and then static journal
  • 00:11:53
    and I'm going to name that as static
  • 00:11:55
    load so you have again options here so
  • 00:11:57
    like as you can go here and then in Step
  • 00:12:00
    module
  • 00:12:01
    or you have stepmon here in the tab or
  • 00:12:06
    otherwise you can have here in the model
  • 00:12:09
    tree step so I can create step from here
  • 00:12:13
    and now you have option here so name
  • 00:12:17
    and then is it journal and then static
  • 00:12:19
    Journal
  • 00:12:21
    to name at static load
  • 00:12:23
    continue
  • 00:12:24
    and then I'm going to leave everything
  • 00:12:26
    default values and you can see their
  • 00:12:29
    static load is being created in the
  • 00:12:31
    model tree next step is to either create
  • 00:12:34
    field output or to modify field output
  • 00:12:36
    stresses displacement and forces are
  • 00:12:38
    required and for this one here you have
  • 00:12:41
    field output requests in the model tree
  • 00:12:45
    so I am going to just click on field
  • 00:12:47
    output and then you have here few stuff
  • 00:12:51
    Domain Whole model and then I am going
  • 00:12:54
    to select stresses I'm going to unselect
  • 00:12:58
    sprains contact I am going to unstress
  • 00:13:00
    so you have either empty or a take or
  • 00:13:04
    then an a box so for the stresses I have
  • 00:13:07
    only selected one part there for
  • 00:13:10
    displacement I have selected only
  • 00:13:12
    translation and rotational displacements
  • 00:13:14
    and for forces reaction forces and
  • 00:13:16
    moment and concentrated forces and
  • 00:13:18
    moments so I have selected these ones so
  • 00:13:22
    once you have modified it so I click ok
  • 00:13:25
    so it is being modified next step is to
  • 00:13:28
    load module create load and step is
  • 00:13:31
    static load which you have already
  • 00:13:33
    defined in Step category mechanical type
  • 00:13:36
    concentrated force and then select a
  • 00:13:38
    point where you want to add
  • 00:13:40
    uh apply load so again you have here
  • 00:13:45
    you have here load module so this is you
  • 00:13:49
    can create a load or you can create a
  • 00:13:52
    load from there or down in the model
  • 00:13:54
    tree you have load here so I'm just
  • 00:13:57
    going to double click it and then you
  • 00:14:00
    will have load so you can name the load
  • 00:14:03
    step is a static load which you have
  • 00:14:05
    already defined category mechanical
  • 00:14:07
    concentrated Force continue
  • 00:14:11
    and then
  • 00:14:13
    select point for the load so I am going
  • 00:14:16
    to select this point here
  • 00:14:19
    and then it's a selected done and now it
  • 00:14:25
    asks me about what are the forces
  • 00:14:29
    so a force of 12 kilo Newton is being
  • 00:14:31
    applied at 0.3
  • 00:14:35
    so in horizontal axis that is 12 E power
  • 00:14:39
    3 so 12 kilo Newton concentrated Force 1
  • 00:14:43
    and then to one mean x axis and 2 mean
  • 00:14:46
    its y axis
  • 00:14:48
    so okay so now this load is being
  • 00:14:51
    applied and you can see that here
  • 00:14:54
    a load one is being created
  • 00:14:59
    next step is to create boundary
  • 00:15:02
    condition using load module so step is
  • 00:15:05
    initial category mechanical type
  • 00:15:06
    displacement rotation and select the
  • 00:15:08
    region for it
  • 00:15:09
    so here I have options for it so in the
  • 00:15:14
    load module you have the second one is
  • 00:15:16
    create boundary condition or otherwise
  • 00:15:18
    you have here to create boundary
  • 00:15:20
    condition or in the model tree you have
  • 00:15:22
    here to create boundary condition so
  • 00:15:24
    double click on it so now the boundary
  • 00:15:27
    condition name is bc1 I'm
  • 00:15:30
    and step is initial categories
  • 00:15:32
    mechanical type is displacement or
  • 00:15:35
    rotation and then I need to select a
  • 00:15:38
    point where I want to apply boundary
  • 00:15:39
    condition so add Node 1 is a simple
  • 00:15:42
    sport
  • 00:15:43
    so simple support which means there are
  • 00:15:46
    two reactions I am going to continue and
  • 00:15:50
    then select the region for the boundary
  • 00:15:52
    condition so I am going to select this
  • 00:15:53
    done
  • 00:15:54
    and then here you have option so U1 and
  • 00:15:58
    U2 need to be uh constrained here
  • 00:16:03
    so
  • 00:16:05
    okay so now you can see that here
  • 00:16:07
    boundary condition is being applied and
  • 00:16:09
    I'm gonna so I renamed that as pin
  • 00:16:13
    and now here I can create other boundary
  • 00:16:17
    condition so
  • 00:16:19
    create
  • 00:16:21
    and then this boundary condition I am
  • 00:16:23
    going to name it as roller the step is
  • 00:16:27
    initial mechanical displacement rotation
  • 00:16:28
    continue I am going to select this point
  • 00:16:30
    so done and on ruler support
  • 00:16:34
    displacement in X direction is free so
  • 00:16:38
    U2 is 0 okay so now you can see that one
  • 00:16:42
    pin support apply it one ruler support
  • 00:16:44
    is being applied the modeling part is
  • 00:16:46
    done next one is analysis job need to
  • 00:16:49
    create job data check and submit
  • 00:16:53
    I forgot to do one thing I need to
  • 00:16:56
    rename that model to name it as plain
  • 00:16:58
    press and then here in the module I have
  • 00:17:02
    here job so I can create a job here
  • 00:17:06
    or otherwise you can create a job from
  • 00:17:09
    there so let's say create a job and job
  • 00:17:11
    name is plain truss and then model is
  • 00:17:14
    plain rust so continue
  • 00:17:16
    leave it as it is and then you have here
  • 00:17:20
    so you right click and then you need to
  • 00:17:23
    First do data check
  • 00:17:25
    so data check will help you to check if
  • 00:17:28
    there is any major problem in the model
  • 00:17:31
    so and then it takes some time
  • 00:17:36
    and then you can see that data
  • 00:17:39
    completed successfully so there is no
  • 00:17:42
    error or it's not being aborted so then
  • 00:17:44
    I can go and submit
  • 00:17:47
    Okay so
  • 00:17:48
    okay and now that is being submitted so
  • 00:17:51
    take some time to
  • 00:17:53
    finish so it's running and then once uh
  • 00:17:57
    status change so you can see that
  • 00:17:59
    completed there
  • 00:18:01
    so this is completed now
  • 00:18:04
    job is complex one in the results you
  • 00:18:07
    need to visualization field output
  • 00:18:09
    dialogue displacement as you stresses
  • 00:18:12
    ss11 when reaction forces
  • 00:18:15
    so it's simple there are different
  • 00:18:17
    options you can go here and click on the
  • 00:18:20
    results and now you can see here
  • 00:18:24
    is a plain truss ODB or otherwise you
  • 00:18:27
    can go here file and then you can open
  • 00:18:31
    an ODB
  • 00:18:33
    OK and then it will
  • 00:18:36
    so select that and open so that is ODB
  • 00:18:40
    and now here you can see that in ODB so
  • 00:18:43
    that is a model so that is deformed
  • 00:18:45
    model and then here you can see that so
  • 00:18:50
    that is with the Contour so you have
  • 00:18:52
    option here so you can
  • 00:18:53
    plot here deformed and undeformed and
  • 00:18:57
    then here you have option
  • 00:19:00
    okay so that is field output dialog and
  • 00:19:02
    that is a primary so you can select U
  • 00:19:05
    from here U1 it's a magnitude in
  • 00:19:08
    horizontal Direction U1 in vertical
  • 00:19:10
    direction or the magnitude of it
  • 00:19:12
    otherwise presses and S11 is axial
  • 00:19:17
    stress which we are looking for and then
  • 00:19:20
    here you have concentrated forces you
  • 00:19:23
    have reaction forces so this is like uh
  • 00:19:26
    we need reaction forces we need stresses
  • 00:19:30
    so that is why in the field output
  • 00:19:32
    dialog so all these are being displayed
  • 00:19:38
    next step is visualization for
  • 00:19:41
    displacements
  • 00:19:43
    okay so you can use prop values so prop
  • 00:19:46
    nodes components or display group all
  • 00:19:49
    and then you can write to the file so
  • 00:19:52
    now here you have two options to go to
  • 00:19:54
    the prop so first you need to select
  • 00:19:57
    here from the field output dialog
  • 00:20:00
    from the field orbital dialog you need
  • 00:20:02
    to select U and then like magnitude and
  • 00:20:06
    then you have either here tools query
  • 00:20:09
    and then in query you have here prop
  • 00:20:12
    values
  • 00:20:14
    so when you are going to get that prop
  • 00:20:16
    value so you have option so select from
  • 00:20:18
    viewport or select a display group
  • 00:20:21
    because displacements or deflection are
  • 00:20:24
    at nodes I select that component all
  • 00:20:27
    selected
  • 00:20:28
    okay all and then display group all
  • 00:20:31
    nodes so now you can see that here are
  • 00:20:34
    the values on the nodes
  • 00:20:36
    so I am going to just
  • 00:20:40
    display
  • 00:20:42
    model and then I select all that and you
  • 00:20:46
    can see here
  • 00:20:47
    so
  • 00:20:49
    deflections
  • 00:20:51
    at these points they are almost zero ten
  • 00:20:54
    to raise power minus 32 they are 0 but
  • 00:20:57
    there must be a deflection at that point
  • 00:20:58
    so horizontal is
  • 00:21:01
    0.96355 and the vertical is
  • 00:21:04
    minus 0.233
  • 00:21:09
    so you can see here
  • 00:21:11
    like u3 and V3 in horizontal direction
  • 00:21:15
    is 0.9635 and the other one is in
  • 00:21:19
    vertical direction is minus 0.2348
  • 00:21:23
    so the same values which you got which
  • 00:21:26
    are in the book so we are getting here
  • 00:21:29
    so one thing you want uh so these are
  • 00:21:31
    the values here so then you can write
  • 00:21:33
    those to a file so all that value you
  • 00:21:37
    can drive to a file and you can create
  • 00:21:39
    report and that report is being saved in
  • 00:21:42
    your work directory and from here you
  • 00:21:46
    can change number of significant digits
  • 00:21:51
    number format automatic engineering so
  • 00:21:53
    I'm selecting engineering and then uh
  • 00:21:57
    it's a write total column totals or
  • 00:21:59
    column any minimum I'm going to select
  • 00:22:01
    both of these two and then I'm going to
  • 00:22:04
    name it as trust plane
  • 00:22:07
    so now that is being saved okay
  • 00:22:12
    so you can see that here you have that
  • 00:22:14
    report created and then you can open
  • 00:22:17
    that report in as a text file using any
  • 00:22:22
    of the software I'm using notepad and
  • 00:22:24
    you can see here like at nodes how much
  • 00:22:28
    is deflection and that is in millimeter
  • 00:22:31
    and then the minimum varies it and then
  • 00:22:34
    the maximum where is it and the total so
  • 00:22:36
    I am going to close that report now in
  • 00:22:39
    the visualization I need axial stresses
  • 00:22:43
    and for that I need to select S11 and
  • 00:22:45
    pro values and stresses are on the
  • 00:22:48
    elements
  • 00:22:50
    so I am going to cancel it
  • 00:22:52
    so
  • 00:22:55
    cancel and previous one I am going to
  • 00:22:57
    clear now from here I'll go s
  • 00:23:00
    here and then S11 and now here I have
  • 00:23:05
    prop values now again so prop values
  • 00:23:09
    and then here I'll select elements
  • 00:23:12
    components all direct and then centroid
  • 00:23:15
    and then all so you can see that if
  • 00:23:18
    there are three element and for each
  • 00:23:20
    element the values you can see there
  • 00:23:25
    okay so these are the values
  • 00:23:27
    so like as these are the values these
  • 00:23:31
    are stresses and I'm going to write to
  • 00:23:33
    file
  • 00:23:34
    and now append to the file so which is
  • 00:23:37
    already created so it is going to append
  • 00:23:39
    that ad there okay
  • 00:23:42
    and then I'm going to cancel it yes to
  • 00:23:44
    continue is to find reaction forces
  • 00:23:46
    again prop value and I'm going to show
  • 00:23:49
    you here how it's going to be here you
  • 00:23:52
    will go RF reaction force is magnitude
  • 00:23:55
    and then here you have prop values and
  • 00:23:58
    reaction forces are on the nodes nodes
  • 00:24:01
    and components all and then all and here
  • 00:24:05
    you can see so these are the reaction
  • 00:24:08
    forces so there is no reaction force on
  • 00:24:10
    node 3 but at Node 1 and node 2 you have
  • 00:24:14
    reaction forces let me check that what
  • 00:24:15
    are in the book
  • 00:24:17
    so
  • 00:24:19
    force in horizontal Direction at Node 1
  • 00:24:22
    is -12 kilo Newton node to in vertical
  • 00:24:26
    direction is minus 18 and a node 2 is 18
  • 00:24:29
    kilo Newton so the same values we got
  • 00:24:31
    here so minus 12 000 minus eighteen
  • 00:24:33
    thousand and eighteen thousand so the
  • 00:24:36
    reaction forces are also verified
  • 00:24:40
    next step is to need create a report of
  • 00:24:44
    using field output for the variable S11
  • 00:24:48
    and Export to Excel and calculate member
  • 00:24:51
    force in
  • 00:24:53
    a Backus you can't get that directly
  • 00:24:57
    member forces so you need to then create
  • 00:25:00
    a report for stresses which I have
  • 00:25:03
    already created so I'm going to show
  • 00:25:06
    here so what we have here for
  • 00:25:10
    and you can see that
  • 00:25:13
    so here the second one
  • 00:25:16
    this report is written and then these
  • 00:25:19
    are stresses
  • 00:25:21
    okay so these are stresses
  • 00:25:23
    and these are the values of stresses so
  • 00:25:26
    I am going to import that file in Excel
  • 00:25:29
    and then
  • 00:25:31
    I calculate xcl4 you uh Excel sheet I
  • 00:25:35
    have opened so I'm going to just copy
  • 00:25:37
    the stuff from there
  • 00:25:41
    and paste here
  • 00:25:44
    and now in the data I'll go text to the
  • 00:25:48
    columns and then fixed with any
  • 00:25:52
    denominator
  • 00:25:53
    okay so here
  • 00:25:56
    next
  • 00:25:58
    finish so now these are these are the
  • 00:26:01
    two stresses or stresses and then I need
  • 00:26:05
    to multiply that with
  • 00:26:07
    area
  • 00:26:12
    so that is minus 18 000 and then the
  • 00:26:14
    other one is
  • 00:26:16
    21 kilo Newton
  • 00:26:20
    so
  • 00:26:22
    I can check that here the member force
  • 00:26:25
    is
  • 00:26:26
    so here are the member forces
  • 00:26:29
    okay so the member forces you can see in
  • 00:26:33
    that uh this member 3 which is let me
  • 00:26:39
    show here what are the members
  • 00:26:41
    so
  • 00:26:44
    labels to element labels and No Label
  • 00:26:46
    apply and that is member three so in
  • 00:26:50
    member three
  • 00:26:52
    uh you can see that in member three so
  • 00:26:57
    force is member force is 21.633 kilo
  • 00:27:00
    Newton
  • 00:27:01
    and you can see that it is the same
  • 00:27:04
    value which you have here
  • 00:27:06
    okay so member force that is a third one
  • 00:27:09
    member force in third member force and
  • 00:27:12
    then similarly for second member
  • 00:27:14
    so
  • 00:27:16
    the member Force for the second member
  • 00:27:18
    can be computed as
  • 00:27:21
    which is we have here in here so that is
  • 00:27:24
    18 000. so now in this way you can
  • 00:27:27
    calculate member forces
  • 00:27:31
    recap and summary of the tutorial so
  • 00:27:34
    this tutorial is 3D plane cross analysis
  • 00:27:37
    in a backup CAE so dimensions of the
  • 00:27:40
    members the mechanical properties are
  • 00:27:42
    given and required is deflection normal
  • 00:27:45
    stress reaction force and axial Force so
  • 00:27:48
    you can find these uh deflection normal
  • 00:27:51
    stress and reaction directly but axial
  • 00:27:52
    member axial Force you need to calculate
  • 00:27:55
    and these are three main steps modeling
  • 00:27:57
    analysis and results so most important
  • 00:28:00
    you there are no such unit in a Backus
  • 00:28:02
    you have to set your own unit you need
  • 00:28:04
    to set work directory and save model and
  • 00:28:06
    then the first is to create part then
  • 00:28:09
    create material then create section so
  • 00:28:11
    section is which type of equations you
  • 00:28:13
    want to saw use to solve particular
  • 00:28:16
    problem then you need to assign section
  • 00:28:18
    to your created part then you need to
  • 00:28:21
    create mesh and for process there must
  • 00:28:24
    be as per Theory there must be one
  • 00:28:27
    element between two nodes so then we
  • 00:28:30
    need to that one member element between
  • 00:28:34
    two nodes and then create instance
  • 00:28:36
    instance is to
  • 00:28:38
    combine your different parts to get
  • 00:28:40
    assembly but here we have only one part
  • 00:28:42
    so then there's no need of going for
  • 00:28:45
    complex assembly then create step so
  • 00:28:47
    step is mean that which type of load you
  • 00:28:49
    are going to apply
  • 00:28:51
    and then you need to modify field output
  • 00:28:55
    or create field output that which output
  • 00:28:57
    parameters you need and here I'm going
  • 00:28:59
    to you I use stress displacement and
  • 00:29:02
    forces and then you need to create load
  • 00:29:04
    or simply apply load then you need to
  • 00:29:07
    create boundary conditions
  • 00:29:08
    and then create a job and then you can
  • 00:29:11
    after creating jobs so you can perform
  • 00:29:13
    data check and then submit so once
  • 00:29:15
    you're being submitted you can go to the
  • 00:29:17
    visualization of the results so you can
  • 00:29:18
    visualize those results in the viewport
  • 00:29:20
    and sometime you like here then with the
  • 00:29:24
    pro value you can first visualize
  • 00:29:28
    deflections and then you can write a
  • 00:29:31
    file report file on that similarly for
  • 00:29:34
    stresses similarly for reaction forces
  • 00:29:35
    but for the member force is uh you need
  • 00:29:39
    to First extract a file report file for
  • 00:29:42
    S11 and then you need to multiply with
  • 00:29:45
    area of cross section to get values
  • 00:29:48
    thank you very much for uh watching this
  • 00:29:51
    video tutorial I hope you find this
  • 00:29:54
    video tutorial helpful so if you have
  • 00:29:56
    any feedback you can leave in comment
  • 00:29:59
    section
  • 00:30:00
    thank you very much
标签
  • Abaqus CAE
  • finite element analysis
  • plain truss
  • steel properties
  • meshing
  • analysis setup
  • static load
  • deflection
  • stress analysis
  • axial force calculation