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Found 7 results

  1. Hello Is it possible to model a 1D element that fails in either tension or shear? I would like analyze a breakaway feature on a structure that absorbs a portion of the impact energy and breaks off. Fracture can be either in tension (i.e cable) or in shear (i.e shear pin). Thank you
  2. Hello I am using RADIOSS to simulate a crash test which I have previously done. The trajectory of the impactor before impact is complex and requires several linkages and mechanisms to set up. The area of interest is the post-impact behaviour (stress/strain) on the target component, as well as the trajectory of the impactor. When I run the impactor by itself, to see the launch trajectory, I get a reasonable run time of about an hour. When I run the impactor with a simplified initial velocity + the target with all the contact and failure cards defined, I get a reasonable run of about 3 hours. When I run the full model: impactor with the initial trajectory + the target with all the contact and failure cards defined, I get a run around 12 hours to reach the impact, and another 12-24 hours to get results from post impact trajectory. I believe this is partly due the finer mesh required for the target model. I was hoping there is a way I can split the analysis in two, using the results from a the first as an initial condition for the second. Consider the following scenario: Model A: Simple model with only what is required to set off the trajectory of the impactor. The target is not modeled. Run from T=0 to T=T_impact. The run is stopped at the moment where the impact would have occurred. Model B: The target, with finer mesh and contact and fail definition is introduced, and the analysis is "RESTART" picking up from where Model A left off. In other words the target (with finer mesh) only appears just before impact onwards. This should theoretically cut down the majority of the analysis time. Is there a way to set up a RESTART file with introduction of new elements / properties / fail cards, and linking it to a "Stopped" run? I hope the diagrams attached illustrates what I'd like to do. Please let me know if there is a way to do this. Thank you. Best Regards, MN
  3. Dear all, I have following doubts in meshing: What if I do good meshing in one portion of solid (say critical portion) and poor quality mesh in some other portion, do the results in the good mesh region are affected by the results of poor mesh region. Or do they remain unchanged? If possible, please explain the reason for the answer. What if we couldn't maintain uniform mesh size in non linear analysis?, If I use small elements to capture the geometry and large elements to keep nodes as less as possible then it causes sudden transition between the two. Does it affects the results badly or increases the solving time?
  4. Subhu

    AMS

    Hi All, I am Running a Frontal crash Analysis. Will AMS suit for this. The time step is not reaching the target value. But the energy error is increasing from the beginning. Need Hellp. Regards, SUBHU
  5. When I run my model, the solver starts to run but hangs up without showing any error or warning, I just get to see the following output: The amount of memory allocated for the run is 1000 MB. This run will use in-core processing in the solver. After this, nothing happens, neither can I kill the run nor abort it or pause it also, I cannot close the window. In the top right corner, it shows, Iteration: 0 Progress: 100% Iteration progress: 0
  6. Dear all, anybody please tell me, whether mixed mesh (Hexa+Tetra+Pyramid) is compatible with the stress analysis under the transient loading in radioss. The time duration of the load is very small. Is there any concern in doing mixed mesh in such a loading condition?
  7. Hello Everyone!! I want to do a Drop analysis of an assembly. The Assembly consists of more than two parts connected by bolts. I have the pretension Loads. Is it possible to apply (include) the pretension loads for the drop analysis (explicit)? Or is there any other way to simulate the effect of pretension? Kindly advice. Thanks in advance, -RathinaVel
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