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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Why the Equivalent (von-Mises) stress is excessivly high for non-linear Nitinol? › Reply To: Why the Equivalent (von-Mises) stress is excessivly high for non-linear Nitinol?

October 16, 2024 at 11:28 am
Kaushal Vadnere
Ansys Employee

Hello,
What is the location of highest magnitude of Eq. VMS in your model? is it over a larger area or on a single node/element? can you attach a screeshot?

The reason I am asking is, this seems like a case of artificially high stress or stress singularity. Artificially high stresses arise in structural FEA model due to variety of reasons such as sharp corners in contact, over-oconstraint, etc. Also, you are using a hyperelastic material model which makes the analysis highly non-linear. You can refer to 'lesson 3 - understanding and dealing with artificially high stress' in this free Ansys Innovation course: Numerically Accurate Results - Innovation Space (ansys.com) to understand how to deal with stress singularities.

Thanks