#23 ABAQUS Tutorial: Modeling Geometric Imperfections With Buckling Modes

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  • Опубликовано: 1 авг 2024
  • How to model initial geometric imperfections in your model based on buckling modes?
    Useful references:
    ------------------------------
    ascelibrary.org/doi/full/10.1...
    link.springer.com/article/10....
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Комментарии • 27

  • @laraditzel
    @laraditzel Год назад +2

    Thanks for the class!
    Just to find some things faster... a detailed breakdown of the modelling process:
    3:41 Rename Model
    3:56 Create a Part and its Partition
    5:14 Properties
    5:36 Create a Section and Assign Section
    5:57 Assembly
    6:07 Create a Loading Step (NL Geometry)
    6:50 Define Reference Points and Rigid Body Constraints
    7:38 Create Reference Point to impose Rigid Body Displacement
    8:26 Create Step: Fixed End BC
    8:55 Create Step: Displacement (Ramp)
    9:50 Meshing
    10:18 to run the job? Define imperfections...
    [in progress...]

  • @aneecafarzana8487
    @aneecafarzana8487 3 года назад +3

    Thank you so very much..helped me a lot to clarify too many confusions...may Allah award you with better requitals

  • @avandinovena5920
    @avandinovena5920 3 года назад +1

    Thank you for the explanation Dr. Ahmed Elkady.

  • @esmaeilmorshedi3573
    @esmaeilmorshedi3573 3 года назад +1

    Like always perfect, Ahmed. Thank you

  • @edgararturogomezmeisel2217
    @edgararturogomezmeisel2217 2 года назад

    Super good video!!!

  • @debdeepmajumder9136
    @debdeepmajumder9136 Год назад

    Excellent videos on FEA... Hope you create similar videos for ANSYS APDL... with details on scripting.

  • @CuongNguyen-tt4jp
    @CuongNguyen-tt4jp 2 года назад

    Dear Ahmed Elkady,
    if we have 2 steps in a job, the first step is a static, general analysis and the second is static, Riks. so how can we apply the imperfection for only the second step in this job?
    Thank you for your help!

  • @user-uq5ny8mc1g
    @user-uq5ny8mc1g Год назад

    thank you for your good tutorial، I have a question. i'm working on IPE sections. my critical load in analysis , without imperfection is 42KN which is very close to experimental results. But when , I incloude the initial geometric imperfection equal to 3.6 mm which is 0.001 time of my beam length, i get results that is not true . its readuses to 32KN which is small than experimental critical load. and my second question is that , is it possible to eigenvalue to be less than my critical load? or it must be always , higher than critical load which obtain from nonelinear buckling analysis called riks method?

  • @SalahM07
    @SalahM07 2 года назад +1

    Slm Dr Ahmed could you clarify why the buckling load of the first mode is negative while the load is in y positive direction ?, i think the first mode should be positive with local buckling in the upper flange that's more rational with the direction of load

  • @miroamir1203
    @miroamir1203 2 года назад

    thanck you doctor ,please doctor if I use pression load in my beam ,In buckling step I use "1 " us reference load ?

  • @happylucas3033
    @happylucas3033 8 месяцев назад

    Hello Ahmed. Thanks for great pedagogical video. One question. If I have a column with several loads along it's height, or say a beam... Should I run Eigenvalue buckling analysis with all these loads and get the corresponding modes ?

  • @neajacob8470
    @neajacob8470 Год назад

    Can u perform a buckling and post analysis in composite cylindrical shell

  • @bishalnaik798
    @bishalnaik798 2 года назад +1

    Thank you Dr. Ahmed for the video. But can we include more than one files into Imperfection keyword?

    • @AElkady
      @AElkady  2 года назад +1

      I don't believe you can do that.

  • @CuongNguyen-tt4jp
    @CuongNguyen-tt4jp 3 года назад +1

    An useful video!
    How can we run a job with * imperfection and predefined fields: initial state in abaqus?
    Regards,

    • @AElkady
      @AElkady  3 года назад

      this video describs how to include and run a model with GI. For predefined fields (such as stresses) yiou can check this video ruclips.net/video/4qyNZW6OHK0/видео.html

  • @hasanfal2515
    @hasanfal2515 Год назад

    Why did we introduce the load (displacement 100 mm) into the main-model, and no effect was shown because of it?

  • @elenikoozbikila6771
    @elenikoozbikila6771 Год назад

    sir can you upload modeling of cold formed steel concrete composite beam please

  • @sohinimishra9202
    @sohinimishra9202 2 года назад

    Hello Dr. Ahmed, many thanks for making this useful video. I followed exactly the same steps shown here to model the initial geometric imperfection. However, I could not see the initial imperfection in the results of the main model at step 0. The .fil was also not created. However, the analysis ran successfully without any error. I am working with Abaqus teaching licence, for your information. Could provide any direction here? I am not very sure if this is any restriction with the teaching licence?

    • @AElkady
      @AElkady  2 года назад

      Yes, that probably means that your license does not support the "imperfection" keyword

    • @sohinimishra9202
      @sohinimishra9202 2 года назад

      Great! many thanks for your response.

  • @sohinimishra9202
    @sohinimishra9202 2 года назад +1

    Hello Dr. Ahmed, could you please clarify, what is the meaning of writing GLOBAL=NO, (after NODE FILE) in the edit keyword section of the linear buckling model? What will be the difference in result if I write, GLOBAL= YES?

    • @AElkady
      @AElkady  2 года назад +1

      GLOBAL=NO is specified to write vector-valued nodal variables (i.e., displacements is this case) in the local directions.

    • @sohinimishra9202
      @sohinimishra9202 2 года назад

      Thank you for your response.

  • @Hello-vu7hb
    @Hello-vu7hb Год назад

    Hey Ahmed, I am modelling an I section like you are in the tutorial, but the space between the flanges is filled with reinforced concrete: in this case: is it enough to conduct a buckling analysis only with the steel profile and create a fil file from only the steel beam or do i have to conduct a buckling analysis from the whole concrete filled i section? because in both cases the first mode is the same so if i scale it the same it shouldnt matter no?

    • @AElkady
      @AElkady  Год назад +1

      You might get errors if the main model nodes are not consistent with those of the buckling model. ABAQUS documentation states the following:
      "ABAQUS imports imperfection data through the user node labels. ABAQUS does not check model compatibility between both analysis runs. Node set definitions in the original model and the model with the imperfection may be different. Care must be taken for models in which ABAQUS generates additional nodes (for example, the nodes generated for contact surfaces on 20-node brick elements). In such cases you have to ensure that the models for both analysis runs are identical and that the nodal information for the generated nodes is written to the results file"

    • @Hello-vu7hb
      @Hello-vu7hb Год назад

      Thank you very much!