Hello Mohankumar,
If you mean elastic deformation, that happens as soon as any force or pressure is applied, so the answer is zero.
If you mean plastic (permanent) deformation, that depends on the yield strength of the material. If the material is ductile, like most metals, then the von Mises equivalent stress is the quantity to compare with the yield strength to determine if the model is above or below the point of permanent deformation.
Regards,
Peter
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