Hi Javat,
It depends on the loading conditions. If the material remains below the yield stress, then its elastic properties are sufficient. However, if the loading exceeds the yield stress in the material, then it is better to use elastic-plastic material properties for the analysis.
For further information, you can check out this AIS course.
https://courses.ansys.com/index.php/courses/metal-plasticity/
You are navigating away from the AIS Discovery experience