the fatigue life of a material can be enhanced by which of t

the fatigue life of a material can be enhanced by which of the following techniques ?

a) cause hardening and introducing sharp corners

b) introduceing compressive stresses and sharp corners

c) cause hardning and shot peening

d) round corners and introducing tensile stresses

Solution

Answer is option (c) cause hardning and shot peening

a strength gradient-Hardening, substantially enhances the fatigue life of the material

Shot Paening is a method of cold working in which compressive stresses are induced in the exposed surface layers of metallic parts by the impingement of a stream of shots directed at the metal surface at high velocity under controlled conditions.

The major applications are related to improvement and restoration of fatigue life and reliability of machine elements by increasing their fatigue strength.