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Abhishek Kumar

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  1. Thank you George for your reply. What I understand from your reply is that, the difference in time for simulation is due the constitutive material law. Gurson model calculate microvoid nucleation and growth at every step and the constitutive law of Gurson model depends on many factors such as mean stress, yield stress, equivalent stress and void volume fraction. Whereas in Johnson-Cook model I am taking only strain hardening effect for simplicity.
  2. I had performed simulation of Incremental sheet forming process in Hyperworks 12.0. In this analysis I compared the two material law (Law52 and Law2) keeping all conditions same. The Gurson (Law52) based model takes 26.3 hrs for simulation while J-C (Law2) based model takes 17.23 hrs for the same analysis. Why Gurson model takes more time for analysis?
  3. I am trying to simulate Incremental Sheet Forming process..I just wanted to improve simulation results..with help of 8noded shell elements.
  4. Just wanted to improve my simulation results as in many Literature I found they used 8 noded shell elements.
  5. That is for 4 node shell element...i want to use 8 node shell element. please see the screenshot.
  6. Hiii. I wanted to use 8 noded shell element in my analysis...which element in hypermesh is 8 noded shell element?
  7. Hiii, TH/SHEL describes the time history of 4 node shell element. In this time history file, F1 and F2 are two variables. In RADIOSS 12 reference guide F1 and F2 are stress in direction 1 and 2 respectively. But when I plot time history for F1 and F2 in hypergraph it shows FORCE. Is it "force" or "stress"? Please clarify.
  8. Hii, I am trying to simulate a tensile test, but I am getting error in FUNCTION READ. I have attached .hm file. e8_tensile_law36.hm
  9. Hii, I have simulated the tensile test experiment but the values of force which I am getting in simulation is very less compared to real time experiment. In simulated result I am getting max. force around 120 N but in experiment it is around 2660 N. Please check attached results and model. I have also attached the results of real time experiment. Thanks and regards, Abhishek e8_tensile.h3d e8_tensile.hm e8_tensileT01 Results.xlsx
  10. Hii prakash, Please find the attached pdf. In this example a comparison has been done between experimental results and simulated results. Same comparison I want to perform in my study. Example_11.pdf
  11. Dear Prakash, Thanks for your continuous support. I just checked the SENSOR/DIAS in RADIOSS manual. Can you suggest me how to edit the card image? I mean what values should I input to card image. Should I use- Tdelay- 0 node1- any node at fixed end. node2- any node at velocity end. Dmin- 0 Dmax- 0.006m (if I want to stop at 6mm displacement) After that should I also edit engine file to stop the simulation at this prescribed displacement? Thanks and regards, Abhishek
  12. Hiii, I was trying to simulate another tensile test.But the result was totally unexpected. I don't know what was the error in my model. This is the result. Meshing- Please find the .hm and .h3d files. pure_shear_12mar.h3d pure_shear_12mar.hm
  13. Thanks Prakash, I will try your suggestions. In actual tensile test experiment specimen breaks after 4-5 mm extension. So I wanted to know that can I simulate the experiment until this point only?Also how I can ensure that the displacement results in simulation are in mm and force results are in Newton. Please tell me about units of the material data which I should follow. Presently I am using following data for MATLAW 2- Density of material- 2.7 kg/m^3 Elastic constant- 69000 MPa a = 58.73 MPa b = 83.81 MPa n = 0.1382 eps_max = 5.711 sigma_max 112.65 MPa
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