Question

material science

s 4 (A) Alloy bar 3340N then Yolsa axi-2 (B) Provide two solutions to improve the fatigue life of a mechanical part (C) Draw or Describe the classification Scheme for the various types of composite matcrials, Le what are the different types of composite materials maximum allowable surface crack length if the surface energy of MgO is 1.0 /m2 (modulus of elasticity of MgO is 225 GPa)? 5 (A) A MgO component must not fail when a tensile stress of 13.5 MPa is applied. Determine the (1X3

Answer 1

Since the S - N curve is not clearly visible still I am suggesting you to answer first one you can find corresponding number of cycle at given by of stress by the graph.

And for second one

Because fatigue always start from the surface of a component therefore for improving fatigue life we should improve surface quality. Surface quality can be improved by

Carburizing of surface

Shot peening

Good surface funish

Chemical treatment of surface

Chemical