The
fatigue strength of metal is improved by setting up compressive stresses in the
surface by a process known as________ .
lancing
shot-peening
hemming
slugging
shot-peening
Fatigue
strength of joints improved by peening :Residual stresses
induced by peening are sensitive to high stress peaks which cause
stress relaxation and loss of improvement. For this reason the
improvements in fatiguestrength reported in the literature vary from
about 50% to more than 200%.
Hence, the correct option is (B).
&Key Points:-
Peening is the process of working a metal's surface to improve its material properties, usually by mechanical means, such as hammer blows, by blasting with shot (shot peening) or blasts of light beams with laser peening. Peening is normally a cold work process, with laser peening being a notable exception.
Preparing students for success in a changing World.
We care about our students
RPSC-AE, RSMSSB-JE, SSC-JE, RRB-JE, PSU's