Hi,
I am using Abaqus 2020 and am having trouble with the Low Density Foam material model. When trying to use multiple strain rates I always receive the error "UNSTABLE MATERIAL BEHAVIOR: THE RATE DEPENDENT STRESS-STRAIN CURVES HAVE INTERSECTIONS. THE MATERIAL DEFINITION MUST BE MODIFIED". This occurs no matter how simple I make the test data, for example:
| Stress | Strain | Rate |
| 0 | 0 | 1 |
| 0.2 | 0.1 | 1 |
| 0 | 0 | 2 |
| 0.2 | 0.2 | 2 |
These two curves definitely don't intersect, but I receive the same error.
Does anybody have any ideas? Perhaps I'm entering the data incorrectly?
Thanks!
