Definition - What does Yield Point mean?
The yield point refers to the level of mechanical stress in a metallic object or other material that generates a complete cessation in elasticity. The stress-to-strain ratio in such a material is no longer constant. Surpassing the yield point may lead to catastrophic failure or corrosion.
Corrosionpedia explains Yield Point
If stresses are applied, then prior to reaching the material's yield point, the material is physically capable of returning to its original shape. An increase in applied stress forces beyond the yield point cause permanent deformation and fracture.
The yield point is a vital empirical value to consider when selecting an appropriate material for building applications, particularly when significant stresses are expected. Inadequate evaluation of a material's yield point often leads to stress corrosion cracking in the material.