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Found 3 results

  1. Hello, is it possible to run a topology optimization maximizing the von-Mises stresses to a state of a Fully Stressed Design ? I want to optimize a reinforced concrete beam under a given load. The respons should be to minimize the mass/volume by optimizing the concrete towards its main compressive stress (reaching a Fully Stressed Design). Is this possible by using the stress constraint definition of optistruct ? Thanks for your answer. Philipp
  2. Hi all, can someone please explain to me the difference between defining the stress constraint via DTPL - Card and by DRESP1-card? All the tutorial models show differerent solutions without explaining the difference in detail. Thanks in adance!! Regards Peter
  3. Hy, I would like to calculate a special safety value from stress responses, and using it in topology optimization. The test of this calculation is started with a simple problem. DRESP1 case 1: - constaint: DRESP1 (von mises stress response, one selected element) - objective: DRESP1 volume DRESP2 case 1: - only response: DRESP1 (von mises stress response, one selected element) - constaint: DRESP2, (equation response) is calculated the following equation a(x)=x and using the DRESP1 von mises response - objective: DRESP1 volume In this case the changes on design variables are the same, and the results are the same. Than i changed the response element quantity to 2 and the DRESP1 and DRESP2 case results are different I have tried to change constraint screening, nothing has changed I have tried to look on sensitivity values, but no stress values included in *.asens files or *_topol.h3d files I have tried to compare it with displacement response/constraint and they are good, so the DRESP1 and DRESP2 with 2 response nodes has the same results. Is this problem connected to Stress-NORM aggregation ? How can i turn ON Stress-NORM aggregation in DRESP2 case? How can i examine the stress response sensitivities? Did i miss someting in the setup? I have attached the 2 different *.hm and *.fem files Thanks, CSR dresp1_simp.fem dresp1_simp.hm dresp2_simp.fem dresp2_simp.hm
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