abormal von mises stresses and peeq values
abormal von mises stresses and peeq values
(OP)
Hi all!
I have an elastoplastic material defined by a Mises yield surface defined by the following input
*Material, name=Mat1
*Damping, alpha=2000.
*Density
7.8e-06,
*Elastic
196000., 0.3
*Plastic
375., 0.
400., 0.009
500., 0.0464
600., 0.1145
676.09, 0.1965
700., 0.2474
710.87, 0.3233
I am performing an explicit analysis and several parts of my structure (at least 5% of the "elements") have von mises stresses and peeq values bigger than the last point of the plastic data (710.87, 0.3233). Is abaqus interpolating beyond (710.87, 0.3233)?
Thanks in advance.
I have an elastoplastic material defined by a Mises yield surface defined by the following input
*Material, name=Mat1
*Damping, alpha=2000.
*Density
7.8e-06,
*Elastic
196000., 0.3
*Plastic
375., 0.
400., 0.009
500., 0.0464
600., 0.1145
676.09, 0.1965
700., 0.2474
710.87, 0.3233
I am performing an explicit analysis and several parts of my structure (at least 5% of the "elements") have von mises stresses and peeq values bigger than the last point of the plastic data (710.87, 0.3233). Is abaqus interpolating beyond (710.87, 0.3233)?
Thanks in advance.





RE: abormal von mises stresses and peeq values
I think it extrapolates yes. 32% plastic strain is a lot. Extrapolation beyond this value might not be physically correct. Remember to activate nlgeom for large deformations (and plastic materials).
Regards,
RE: abormal von mises stresses and peeq values
I am using data presented in this paper "The Stress–Strain Behavior of Coronary Stent Struts is Size Dependent Ann Biomed Eng. 2003 Jun;31(6):686-91." for 316L stainless steel.
Here you can find the stress-strain plot that I used (150micron curve). (http://imageshack.us/photo/my-images/191/30l1.png/)
So it makes sense having 32% plastic strains... Right?