Mechanical Metallurgy Practice Test 7

1. The correct graph to show the relationship between the crack growth rate (da/dN) vs stress intensity factor range (ΔK) is shown in the figure ________

2. The following hysteresis cycle represents the adiabatic loading and unloading of a sample in the elastic region, without thermal equilibrium. Which part of the curve is associated with increase in the temperature of the sample?

3. Which state of the creep curve state is associated with the metallurgical changes in the material?

4. The fatigue strength of the metal strain aging due to interstitial atoms is shown by which of the following curve?

5. The relationship between the K_f and K_t is defined as ____________ (where q is notch sensitivity factor).

6. The material with higher stacking fault energy has higher fatigue strength whereas the material with lower stacking fault will have a lower fatigue limit.

7. The fatigue strength reduction factor is not affected by ____________

8. The fatigue failure is divided into ______ major parts.

9. The electroplating always has a positive effect on fatigue properties.

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