Learning Forum

[John Doyle]

The time hardening creep models can sometimes be very challenging to converge because the time component can overwhelm the stress dependence - time marches on but the material algorithm can only adjust the stress to find the correct value of creep strain. For example, if a generalized time hardening is ecr = C1*sigma*t^r, then if t^r is large the material algorithm needs for find a very small value of sigma so that the creep strain is small enough to satisfy the constitutive equation. n The general guidance is that the time hardening formulations work best in constant stress or when the loading in the simulation is close to the experimental loading.n

[Govindan Nagappan]

Thank you for sharing this informationn