Learning Forum

[varundev]

why does ansys uses different equation to define power law , while most of the literature has different equation . How can i define strength coefficient (K) in ANSYS

[Sheldon Imaoka]

HiArray,nThe Power Law hardening model you cited that is in Mechanical APDL, while having a similar name, is a specific implementation.nThe Power Law model you want to use is not something that is directly implemented in Mechanical APDL. In Mechanical & Mechanical APDL, we want a distinct yield point, so we can separate elastic and plastic strains as output that engineers typically review - the power law model you cited has no distinct yield point, so if such a constitutive model were implemented, we would be reporting that material is always yielding since plastic strain component will always be non-zero (but tiny).nThus, I'd like to suggest that you use Excel to define stress vs. plastic strain as a table that you can utilize instead. In such a case, you do have to identify your yield point separately, but that is actually a good thing, as stresses below your defined yield point will not undergo plasticity.nRegards,nSheldo