Recent content by MMTUser1

I will try this approach. So far, we built a simple model and have successfully tested till we could apply Original YUM formula through FORTRAN code. I would verify it again. Static step. A tensile test with cyclic loading would belong to implicit analysis. I wil try with smooth step amplitude...

Hi, I have encountered this issue in my cyclic loading tensile test simulation but only my stresses were negative. This usually occurs when you have defined a displacement boundary condition using amplitude to replicate the loading. Since we implement a defined displacement at a defined time...

I tried to smoothen the amplitude of the loading curve obtained from the experiment. The simulation curve now resembles the experimental curve more.

Yes, the increment size is set to 0.001 for both initial and maximum increment size. We are using automatic increment and not fixed increments. The field output request is set for whole model (domain) for frequency = every n increments and n = 0.001. Thank you for confirming these inputs. Now...

Yes, amplitude is applied to the displacement BC to recreate the cyclic loading. The time step is given as 0.001 and there are 1000 points in the amplitude data. That should be the resolution needed for the simulation, if I am correct. The displacement values are directly taken from the tensile...

Thank you for the reply and all the information! You are right about the RVE, we used a single element model to test the FORTRAN code in the simulation and called it an RVE. We are now focusing on the single element model to rectify the issue. The original YUM model is giving correct results as...

Following is the FORTRAN code snippet: CALL GETVRM('SINV',ARRAY,JARRAY,FLGRAY,JRCD,JMAC,JMATYP,MATLAYO, 1 LACCFLA) SvM = ARRAY(1) current_von_mises_stress = SvM IF (KINC .EQ. 1) THEN ! For the first time step, current and...

Further information: To check the FORTRAN code, we used a RVE (a simple cube element). Original YUM formula mentioned in the research paper works correctly. The modified YUM formula gives negative E values at certain time points which can be seen as the oscillations on the Force-Displacement...

Thank you!

I am currently working on a FE simulation project where a tensile test of DP800 steel is subjected to cyclic loading. It utilizes Yoshida Uemori model (YUM) to formulate the modulus of elasticity (E) to simulate the hysteresis caused by cyclic loading. We are using a USDFLD subroutine in...