Fatigue occurs in materials subjected to repeated loading and unloading, leading to microscopic cracks at stress concentrators. The Poisson's ratio of a material can be 0.35, which falls within the typical range of 0 to 0.5.

1. Under which type of loading does fatigue occur? static load plane load high load repeated
load Which of the following may be the Poisson ratio of a material? 0.35 0.52 0.55 0.60
Solution
1.D
Fatigue occurs when a material is subjected to repeated loading and unloading. If the loads are
above a certain threshold, microscopic cracks will begin to form at the stress concentrators such
as the surface, persistent slip bands (PSBs), and grain interfaces.
2.poissons ratio =0.35 since poissons ratio is between 0 to 0.5