Hello All (not just Laurent)
I thought I'd do this as I am asked regularly about this and hope it helps generally.
Let me know if I have made any mistakes and I will fix
The deformation units are definitely those of strain : mm/mm or inch/inch etc
Laurent's full stress strain curve:
Yes, in Creo 2 only the plastic part of the curve is entered.
So Laurent's Creo 2.0 table should be
x-axis is only for plastic strain, note the tensile yield is picked out from your data on the right side of the graph. You don't have to enter 17.1; it's done for you.
Stresses and strains should be TRUE and not ENGINEERING. Generally this is not a problem up to 5% (elastic+plastic=total) strain
It is best to ensure that there is an elastic 'core' such that the loads are supported by elastic and plastic parts.
Stresses that rise beyond the extent defined in the data will lead to failure.
Do not apply elasto-plastic materials to an entire component, create volume regions where plastic strains are expected and only apply the plastic properties to these volume region. It may be necessary to run a linear analysis first to define these regions.
Refine the meshes in these regions.
If the material volume is substantially plastic, consider using displacement control (if possible) rather than loads
NOTE. Creo 3.0 behaves differently. It is assumed by the software the first 2 rows of the table define the linear region. i.e. Laurent's full curve and not just the plastic part. Again it's TRUE and not ENGINEERING.