Load step
Load step
(OP)
Hi gentlemen,
I am condidering 3 load steps in my problem in each forces are acting in x,y & z axes respectively. I could see at the end the summed up result. But if I am deleting the Y force after solving the 2nd step & applying Z force in 3rd step, I could not see the effect of Y force at the end but at the end of 2nd step I could see the effect of X Y forces.
My question is How should it be taken for understanding? Practically If I am applying a Y force & then removing it at the end time before the 3rd one, will it not affect the material. If that force is creating any plastic strains at the time end(of 2nd step), then how that has to be taken into account?
Then for plotting plastic strains, if i use PLNSOL,EPPL,X,0,1 command its printing an error EPPL data unavailable. How to plot that?
Thanking u, Thiru.
I am condidering 3 load steps in my problem in each forces are acting in x,y & z axes respectively. I could see at the end the summed up result. But if I am deleting the Y force after solving the 2nd step & applying Z force in 3rd step, I could not see the effect of Y force at the end but at the end of 2nd step I could see the effect of X Y forces.
My question is How should it be taken for understanding? Practically If I am applying a Y force & then removing it at the end time before the 3rd one, will it not affect the material. If that force is creating any plastic strains at the time end(of 2nd step), then how that has to be taken into account?
Then for plotting plastic strains, if i use PLNSOL,EPPL,X,0,1 command its printing an error EPPL data unavailable. How to plot that?
Thanking u, Thiru.





RE: Load step
I am not sure I understand your question exactly. As I understand you are trying to capture the stress envelop caused by different loading combination. Of course, for nonlinear problem, the final results may totally different for different set of loadings even though this is not so obvious for some problem. However, for J2 plasticy this may show up very different results i.e. X load is pressure, Y load is shear and again Z is pressure. Applying X,Z then Y at the last step obviously result the different responses of structure since plasticity will not occur before Y is applied. Is this your question?
Bests,
RE: Load step
However, in dealing with nonlinear problems, you should bear in mind that the results are path dependant, and you need to apply your 'loading history' correctly.