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gslee

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About gslee

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  1. Hi, @Andy I have the two questions. The factors which have an effect on friction force are 'FRIC' and 'VISF'?? 'VISS' is a factor which has an effect on normal force of interface?? Thanks.
  2. Hi, @Andy Thank you for your answer. I appreciate that. The factors which have an effect on friction force are 'FRIC' and 'VISF'?? 'VISS' is a factor which has an effect on normal force of interface?? I attach the model in which contact interface is TYPE7. type7_0001.radtype7_0000.rad Thanks
  3. Hi, @Andy Thank you so much for your answer. I appreciate that. Contact energy output and other energy output are as follows. (Left is setting FRIC=0.2, Right is setting FRIC=0.0) Firstly, as you said, I thought high %energy error is the result from contact energy (friction and crash) because the contact energy is not included in %energy error. So I plot the IE, KE, HE, CE, DTE. 1) I thought DTE is the result from the contact energy, but contact energy is very small. 2) In your answer, 'In the TYPE7 contact model try setting FRIC=0 to see if the energy error is low. If it is low, then the energy error is from the friction and it is OK to have that large of an energy error.' I think that contact energy is so high that %energy error is high. But contact energy is so small. I don't know why %energy error is so high. Please let me know if the opinion is wrong. How do you think about that? Thanks
  4. Hi, @Andy Thank you for your answer. You mean that the damping energy from rayleigh damping causes the energy error. To check the energy error on the model which doesn't have contact (sliding and crash), I compare the 2 models. (No contact, Tied contact) In 3 models, the same rayleigh damping, boundary condition and same loading condition is applied. No contact (Only Yellow component) The energy output is as follows. Tied contact (No sliding and No crash) The energy output is as follows. In the results, although the same rayleigh damping is applied, the %energy error is very small. The high %energy error occurs in the model which has TYPE7 contact. How can I do to reduce the %energy error? How do you think about that?? Thanks.
  5. Thank you for your answer. Loading condition is as follows. (/CLOAD) <- loading curve Unit system is ton,mm,s. In my model, there is a contact interface between Yellow component and Green component. (TYPE 7) TYPE 7 setting is as follows. In the model, there is a rayleigh damping applied on the Yellow and Green component. -> Total energy decrease graudally. Plotting result is as follows. In the output file, negative energy error is -34.4%. Why is this so high? Thanks
  6. Hi, Translational total energy and External force work are same? In referernce guide, energy is as follows. In this topic, However, in my case, Why are they different?? Thanks
  7. Hi, In radioss manual, there is a contact energy formulation. This formulation considers normal force and tangential force? or only consider normal force? What is the 'L' and 'n'?? Thanks
  8. Hi, In RADIOSS theory manual, TYPE7 contact energy formulation is as follows. In formulation, what is the 'L' and 'n' ?? I think this contact energy formulation is only about normal contact force. Is there any formulation about tangential contact force? I want to know the reference about the formulation. Thanks.
  9. Hi This figure shows the accelerations on the node using /TH/NODE and /TH/ACCEL. F_cut of /ACCEL is the recommended value (1650Hz). Filter CFC1000 (F_cut 1650Hz) is applied the acceleration using /TH/NODE. Why are they different? Thanks.
  10. Thank you for your answer
  11. Hi, I want to use /TH/MODE. I can't find it in HM. How can I find it?? Thanks.
  12. Hi, I want to check interface stiffness in TYPE7. Solver compute interface stiffness automatically every time step. How can I check it? Thanks
  13. Hi, The problem is as follows. After 1 cycle, run file stops. Why doe it happens? How do I do? Thanks
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