Hello,
I'm trying to apply an elasto-plastic law in Radioss which contains both compression and tension aspects. It seems that Law 36 and Law 66 are two elasto-plastic laws considering both compression and tension aspects, as is discussed in this post:
https://community.altair.com/community?id=community_question&sys_id=f086c83a1b2bd0908017dc61ec4bcb01.
However, the simulation has errors (ERROR ID: 23) when using Law 66 because the shell property /PROP/SHELL is not compatible with Law 66, as is discussed in this post:
https://community.altair.com/community?id=community_question&sys_id=fb86cc3a1b2bd0908017dc61ec4bcbb2.
Therefore, Law 36 seems to be the suitable one. But I have some queries when inputting the material data. Here are my questions:
How to define the whole compressive and tensile plastic strain-stress curves in Law 36? Because in Law 66, we can respectively input compressive and tensile plastic strain-stress data via functions "fct_IDc" and "fct_IDt". But in Law 36, in my opinion, only tensile plastic strain-stress data at different strain rates can be input via "Nfunct". While for compressive plastic strain-stress relationship, how to define it? It seems "fct_IDp" is used to distinguish the behavior in tension and compression, and the effective yield stress is then obtained by multiplying the nominal yield stress by the yield factor corresponding to the actual pressure i.e. Sig_y=Sig_y * yield factor, as illustrated below:
The problem is that I have the compressive plastic strain-stress curve, how to use it correctly in Law 36? As I really don't understand the usage of "fct_IDp" , it seems to be relevant to pressure and the default value is zero.
Could someone help me solve this problem? Any help would be appreciated.
Best.
