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Amasker

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Everything posted by Amasker

  1. @Prakash Pagadala What does 2017.2.3 mean? I made a simple collision model and found that the rigid wall passed through the steel plate after the collision and moved a distance. How to control the speed of the rigid wall to zero after colliding with the steel plate, and how to deform the steel plate, I don't know How to set these parameters? here is the model file plate.dynamic.fem plate.dynamic.h3d
  2. @Prakash Pagadala Thank you, I am waiting your reply
  3. @Prakash Pagadala Deselect the CSTRESS and CSTRAIN output. This is still the problem after running the file, will it be related to the time step setting?
  4. @Prakash Pagadala B.dynamic analysis.2.out plate.dynamic.1.out plate.dynamic.out
  5. Hi, @Ivan Thank you very much, it is unrealistic to find a static load simulation collision. This simulation is even ridiculous. I am now ready to improve the simulation method to convert the static load into a rigid wall collision. After the model was modified, the calculation found that it was an error after a few hours, showing the following information. *** INTERNAL PROGRAMMING ERROR *** In file "datasetFtoC.c", at location # 352. Can't find the cause of the error? This is my revised file, please check it for me. At the same time, a simple model was used to simulate the collision. The same calculation time was long. Because of the first use of explicit analysis simulation, some parameters did not know how to set it to shorten the unnecessary calculation time. This is a simple collision file. I am sorry to ask you questions frequently. thank you. B.dynamic analysis.2.fem plate.dynamic.1.fem plate.dynamic.fem
  6. @Prakash Pagadala@Ivan Hi,I ran the file again,I found the force is 1000N,but,I intend to convert the collision force of 50Km/h into a static load. The action time is 0.01s, which is about 1300KN, and then spread to the node. Then I find that the result does not converge. I don't know wether the idea of transforming the collision force into a static load Is feasible。 Here is the file b_pillar.e5.fem b_pillar.e5.h3d
  7. @Prakash Pagadala@Ivan I am sorry about,I run the file again,successfully,Thank you。
  8. Hi,@Prakash Pagadala The first file is mine, the plasticity setting is wrong, the plasticity does not work, The second file is modified by Ivan, the plasticity is set, but the calculation result is unrealistic, and I don’t know where the problem is. B.plastic.fem b_pillar.fem
  9. Hi, @Ivan I calculated the fem file you uploaded and found that after setting the plasticity, the displacement, stress and strain have become very huge. For example, before the plasticity are set, the maximum displacement is 275mm to meet the requirements of the vehicle intrusion, but the stress is very huge.far beyond the limited strength of steel,, but after the introduction of plasticity, the displacement reaches a maximum of 175,000mm. Is this wrong? I'm confused。
  10. Thank you very much. @Ivan At first I wanted to simulate the optimal design of the B-pillar under crash conditions. I didn't find a way to simulate the collision in Optistruct. Because of the simultaneous optimization of composite and the optimization of the size of the steel plate, Radioss cannot be realized at the same time. so use the collision force at 50 km/h is equivalent to static load. Can you give some advice? thanks。
  11. @Prakash Pagadala Hi, I groped for a day and still don't know how to change the analysis type to Non-linear quasi-static. In addition, I want to introduce plastic properties under static load, and NLPARM settings need to consider load increment. In other words, NLPARM is considering the changing load, but I am applying a constant static load. I am confused about how to set material nonlinearity?. Can I provide some related tutorials or cases? Thank you。
  12. Hi, @Prakash Pagadala I tried to introduce plasticity in MATS1, but the result did not change. Is it wrong with my settings? It seems that plasticity does not work. Can you check if the model settings are wrong? Thanks B.plastic.fem
  13. Hi,@Prakash Pagadala, because the model deformation and stress are very large, I want to introduce plastic materials, How to define plastic materials in hypermesh, how to set up? Can you give some relevant suggestions or related materials? thank you
  14. @Prakash Pagadala Thank you,I try to set composite failure response and failure index constraint,but a fatal error appear: *** ERROR # 1807 *** Composite failure responses are applied to ply 1 which belongs to a topology or free-size domain.
  15. Hi,@ Prakash Pagadala Since Per PCOMPP you can select only one failure theory. What do you mean by the above suggestions?,I am confused.
  16. @Prakash Pagadala Composite failure theory includes Hill theory、Hoffman theory、Tsai-Wu theory、Maximum Strain theory、Hashin criteria When setting the material properties, choose a failure theory as the composite failure index. As shown below, I don't know how to set multiple failure indexes, or do I understand the failure index incorrectly?
  17. Thanks, @Prakash Pagadala Due to lack of engineering experience, I don't know how to add other constraints to solve this problem. Can you give some advice?
  18. Hi, I made a simple optimization - about composite optimization and steel plate size optimization, the following is the input file, the result shows FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED). But when viewing the contour image, it is found that the partial area of the composite is invalid, the composite failure index greater than 1,does it mean that Optimizing the design is not feasible, Can someone give some advice?Thanks in advance。 B.FS.355.fem
  19. @Prakash Pagadala Thanks,I also found the same problem, but the load and the unit are carefully checked. Regarding BCs, I don't know whether this constraint can really and effectively simulate the constraint of the B-pillar in the whole vehicle.Maybe BCs is wrong??I don't know.
  20. Thank you, @Prakash Pagadala I converted the concentrated load into a pressure load. After optimization, I found that the displacement of the upper end of the B-pillar is particularly large. I want to know how to set the boundary conditions and constraints to get close to the constraint of the B-pillar in the whole vehicle. And can you check the errors in the model ? FS..2..(4).fem
  21. @Ivan@Prakash Pagadala Thank you very much, the B-pillars I am working on now include steel plates and composite materials, so the optimization of the steel plate thickness and composite materials should be optimized at the same time. However, the optimization module in RADIOSS does not seem to support composite optimization. So I have an idea of equating transient loads into static concentrated loads, but how do you spread this concentrated load to a specific area? Can you give any advice?
  22. @Prakash Pagadala I am trying to simulate the optimization of the B-pillar under the collision of a certain object with speed. I think this case should be regarded as a transient load. I don't know how to set the velocity. Can you give me some details, or provide some related tutorials? Thank you
  23. @Prakash Pagadala, Is optistruct unable to load the dynamic load? I want to apply the velocity load. Do you mean to replace the speed load with displacement? I don't know how to do it. Can you tell us more about it? Thank you
  24. @Prakash Pagadala I am very grateful for your help. I have successfully set the thickness of the node. There is still a question. in size optimization by using shell element,Can I set nodal thickness as the design variable ?
  25. @Prakash Pagadala Thank you very much for your reply. I tried to change the thickness of the node(nodal thickenss) to simulate the thickness change, but as a newbie, I have been trying for a long time and I don't know how to do it. Can you provide some tutorials or examples on how to set nodal thickness? Thank you
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