Correct Answer - Option 3 : Fatigue of the metal
Explanation:
Plasticity of the metal-
(i) The characteristics of the metal by which it undergoes inelastic strain beyond those at the elastic limit is Known as plasticity.
(ii) Plasticity can be described as the increase in strain at the same stress level. The ductile metals shows more plasticity.
Workability of the metal-
(i) Workability is defined as the extent to which a material be deformed in a specific metal working process without the formation of cracks. If ductility of the material is high the material can be mechanically worked with ease.
Fatigue of the metal-
(i) A member which is subjected to reversible tensile or compressive stresses may fail at stresses may fail at stresses lower than the ultimate stresses of the material. This property of metal is called fatigue of the metal.
(ii) Due to cyclic or reverse cyclic loading fracture failure may occur if total accumulated strain energy exceeds the toughness. Fatigue causes rough fracture surface even in ductile metals.
Creep-
(i) It is a permanent deformation which is recorded with passage of time at constant loading. It is plastic deformation in nature.
(ii) The temperature at which creep is uncontrollable is called homologous temperature.
