Original: According to the properties of the material , failure will occur as yield for materials with ductile behaviour ( most metals , some soils and plastics ) or as rupture for brittle behaviour ( geomaterials , cast iron , glass , etc ) .
Simplified: Then materials will react with ductile behaviour ( most metals , some soils and plastics ) or with fracture in case of brittle materials ( geomaterials , cast iron , glass , etc ) .