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    Hi Yashh Gaikwad The below link might help you: https://altairuniversity.com/learning-library/1-impact-analysis-set-up-for-radioss-in-20mins/
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    There are two options: -instead of minimize compliance objective subject to volume fraction constraint, try minimize volume fraction objective subject to stress constraint. Note that stress constraint in this case is defined by static stress response (DRESP1), not on topology card -optimization in two stages (concept and detail): first concept stage without stress constraint on topology cards and minimize compliance objective subject to volume fraction constraint, and in the second detailed stage (after interpreting results of first stage), perform size, shape or free shape optimization to locally optimize the design and stay bellow stress constraint.
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    Place a picture box in panel area: set picbox [label .mypic -text Hello] lassign [hm_getpanelarea] x y W H place $picbox -in .hmContainer -x 100 -y [expr [winfo height .hmContainer]-$H+50]
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    Hi, the following might help you: https://altairuniversity.com/conceptual-design-of-a-3-wheeler-motorbike/conceptual-design-of-a-3-wheeler-motorbike-crash-box-analysis/ http://altairuniversity.com/wp-content/uploads/2013/09/Crashbox_rm_w_Post_Marco_MG.pdf First try to set up the simulation yourself, because you will not learn if someone else did it for you. Besides, not enough details are provided like material and initial velocity. RD-T_ 3530 Buckling of a Tube Using Half Tube Mesh.pdf
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    Hi, there are limitations for stress constraints in topology and free-size optimization (see attached document). The stress constraint definition in a topology optimization is a global constraint and does not target local stress concentrations. These areas can be addressed subsequently through size, shape, and free shape optimization or a combination thereof. Subsequent size, shape or free-shape optimization is performed to minimize the mass while meeting stress and deflection criteria. Artificial stress concentrations are filtered out during topology optimization with stress constraints. These include regions around rigid connections, concentrations due to hard geometric features such as corners, etc. from Optistruct User Guide: Stress Responses for Topology and Free-Size Optimization.pdf
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    Thank you a lot for the explication.
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    Dear @Ivan I really appreciate your help thank you.
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    If the analysis ends and the analysis' results are available it means analysis has converged. The basic principle in assessing nonlinear convergence is to compare an error measure of the solution with a pre-determined tolerance level. When the error falls below the specified tolerance, the problem is considered converged. In a case of multiple, simultaneous convergence criteria, all criteria need to be satisfied for the solution to be converged. Convergence monitors relative error in displacements, loads, work or any combination. These norms only measure the error of the nonlinear iterative process. Their values do not represent the accuracy of the finite element solution, only the fact that the nonlinear process has converged properly. However, the results shouldn't be trusted blindly so verification and validation steps have to be taken before results can be given any credibility. https://blog.altair.com/verification-and-validation-in-fea/ https://www.engineering.com/DesignSoftware/DesignSoftwareArticles/ArticleID/11356/Verifying-Your-Finite-Element-Analysis-Results.aspx https://www.nafems.org/publications/browse_buy/browse_by_topic/qa/verification_and_validation/
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    Hi @vishruthdilip you can try manually extracting the midsurfaces, by picking a pair of surfaces: geom>midsurface>final edit tool>surface pair or try other manual options or manual editing:
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