21-Mat-A4 Deformation Behaviour and Properties of Materials: May 2017

Paper format. National Exams, May 2017 — 12-Mtl-A4, Mechanical Behaviour and Fracture of Materials. Three hours, closed book, one approved non-communicating calculator. Eight questions of 20 marks each; the rubric marks only the first five questions as they appear in the answer book. All eight are solved here. This sitting's own printed content is fracture mechanics, fatigue crack growth, creep, toughness, strengthening, composites and plastic instability.

Reference texts. The answers below are keyed to the works normally recommended for this syllabus code:

• G. E. Dieter, Mechanical Metallurgy, 3rd ed. — fracture mechanics and design (Ch. 12), fatigue and crack propagation (Ch. 13), plastic instability/necking (Ch. 3), creep (Ch. 14).
• W. D. Callister and D. G. Rethwisch, Materials Science and Engineering: An Introduction, 10th ed. — stress-strain behaviour, toughness and resilience, strengthening mechanisms, composites, slip systems, ductile-to-brittle transition.

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