Hi Sal,
When strains reach 20% like you have here it is important to use the “Large plastic strains” option as Henrick specified and you are probably getting necking. It is also important to know how stress and strain are defined. Most experimental data report engineering stress and engineering strain. When you select the large plastic strains option I believe COMSOL is expecting “true” stress and plastic strain. You should therefore convert your test data to these measures if necessary. The differences are insignificant at say 2% strain but at 20% they are not.
Nagi Elabbasi
Veryst Engineering
When strains reach 20% like you have here it is important to use the “Large plastic strains” option as Henrick specified and you are probably getting necking. It is also important to know how stress and strain are defined. Most experimental data report engineering stress and engineering strain. When you select the large plastic strains option I believe COMSOL is expecting “true” stress and plastic strain. You should therefore convert your test data to these measures if necessary. The differences are insignificant at say 2% strain but at 20% they are not.
Nagi Elabbasi
Veryst Engineering
