9. Which process generally causes final failure in fatigue? A. Necking B. Corros

Question

9. Which process generally causes final failure in fatigue? A. Necking B. Corrosion C. Fast fracture D. Elastic buckling E. Plastic instability 10. What is the stroke of a piston engine? A. Cerebrovascular accident B. Distance of piston travel C. Diameter of the cylinders D. Ratio of maximum volume to minimum vol- ume on a E. Design power output 11. How do cracks form in high-cycle fatigue? A. Stress concentrations cause local plasticity. B. Dislocations pile up at grain boundaries. C. General plasticity roughens the surface. D. Energy dissipation generates heat. E. Cleavage occurs where ? > ?. etal 12. How do cracks start in low-cycle fatigue? A. Stress concentrations cause local plasticity. B. Dislocations pile up at grain boundaries. C. General plasticity roughens the surface. D. Energy dissipation generates heat. E. Cleavage occurs where ? > ?.

Explanation / Answer

9) The final failure in fatigue is

Answer: E) Plastic Instability

The failure occurs in three different forms, elastic deformation, plastic deformation and fracture.The final fracture is ductile in nature and is the plastic instability.

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