Machine-translated by Google. Questions are authored in English.
Top

Discussion

Shot peening improves fatigue life principally by

  • A.Introducing a compressive residual stress in the surface layer
  • B.Polishing the surface smooth
  • C.Increasing the material's yield stress throughout
  • D.Removing all surface cracks

Answer: A

Bombarding the surface plastically deforms a thin layer that the bulk then holds in compression. Since fatigue cracks almost always start at the surface, that compression must be overcome before any tensile cycle is felt there.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.