Discussion
Consider the following statements about fatigue life improvement:
1. Cold working a hole leaves compressive residual stress around it.
2. Shot peening puts the surface layer into compression.
3. Both work by raising the material's yield stress.
Which of the statements given above is or are correct?
Answer: D
The first two describe the two techniques correctly. The third misattributes the mechanism: neither changes the material's properties, and both work by introducing a residual stress that applied tensile cycles must overcome.
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