PPT Slide
The terms flow criterion, yield criterion and failure criterion have different meanings.
- Yield criterion applies mainly to materials that are in the annealed condition (usually ductile materials).
- Failure criterion applies to both ductile and brittle materials. However, it is mainly used for brittle materials (fracture criterion), in which the limit of elastic deformation coincides with failure.
- Flow criterion applies to materials that have been previously processed via work hardening (usually ductile materials).