Machine Design
Auto frettage is the method of

Joining thick cylinders
Increasing the life of thick cylinders
Pre-stressing thick cylinders
Calculating stresses in thick cylinders

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Very serious in ductile materials and less serious in brittle materials
Very serious in brittle materials and less serious in ductile materials
Seriousness would depend on other factors
Equally serious in both types of materials

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