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1. Describe the mechanism of crack propagation for both ductile and brittle

modes of fracture.

2. Explain why the strengths of brittle materials are much lower than predicted

by theoretical calculations.

3. Define fracture toughness in terms of (a) a brief statement and (b) an

equation; define all parameters in this equation.

4. Make a distinction between fracture toughness and plane strain fracture

toughness.

5. From a fatigue plot for some material, determine

(a) the fatigue lifetime (at a specified stress level) and

(b) the fatigue strength (at a specified number of cycles).

6. Define fatigue and specify the conditions under which it occurs.

7. Define creep and specify the conditions under which it occurs.

8. Given a creep plot for some material, determine

(a) the steady-state creep rate and (b) the rupture lifetime.