Mechanical Metallurgy Practice Test 7

1. The fatigue limit of the cast and wrought iron is around ___________ of tensile strength.

2. Is it possible that the material which shows the fatigue limit in normal environment does not show any endurance limit in a corrosive environment.

3. The size of the component does play a role in deciding the fatigue life of the element.

4. Generally, the fatigue crack initiation takes place in which stage of the life of the component?

5. Find the crack growth per cycle for a steel plate where the crack growth equation is given by:
-> da/dN = A(ΔK)^p
The value of p=3, A= 6.9*10^-18, and stress intensity factor variation is 1 kPa m^1/2.

6. Which of the following material has the highest damping capacity?

7. The fretting is the process of ____________

8. The fatigue strength of the material ___________ as the grain decreases.

9. The stress concentration factor and fatigue strength reduction factor are the same quantity.

10. The measure of the internal friction is the fractional decrease in ____________ per cycle.