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Found 4 results

  1. Anyone can explain *CONTROL_TIMESTEP
  2. Hello everybody, I want to perform an explicit analysis in radioss. I have read that we follow a time step of 1E-06 sec for steel with minimum element size of 5 mm. In my case the element size goes up to 1 mm. I have gone through the book "Crash Analysis with Radioss", according to which we have to look for two formulae to calculate the time step- one is elemental time step and the other is nodal time step. With an approximate sound speed of 5000 m/s through steel, I calculated the time step of 2E-07 sec [i.e., 1 mm / 5000 m per sec]. But I am not able to figure out how to calculate the nodal time step? Would somebody help me out with this? My question is - how much smaller time step would I require to take (for steel) in this case? [Please suggest me an optimum- rough estimate for the element size of 1 mm for steel by taking into consideration the nodal time step also].
  3. what exactly element time and nodal time step mean?
  4. I am simulating a rubber component where rubber has a self - contact as it compresses, but i can see through animations that elements are intersecting and penetrating. I have defined type 19 self -contact (with Istf=4 and inacti 6 and igap =1) by using surf cards via components. and used mat 42 as material card and Isolid 24 as formulation. with material property. The model is in volume cavity and can only displaces in gap between it and load is applied horizontally by displacing a rigid shell along outerbody in horizontal direction and rigid element with internal nodes of rubber is fixed in space. Cut -section displacement <2mm (gap is 2mm) and element start to deform at before gap reduction element distortion and time step is reducing .there is penetrations and intersection between elements despite self-contact what should be contact parameters or any other input to avoid such behaviour?
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