Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

abormal von mises stresses and peeq values

Status
Not open for further replies.

neslon

Bioengineer
Apr 24, 2013
15
PT
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.
 
Replies continue below

Recommended for you

Hi,
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,
 
Hi.

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). (
So it makes sense having 32% plastic strains... Right?
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top