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22-Mec-B8 Engineering Materials: May 2018

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Processing routes for aerospace FRP laminated components
  2. Question 2 ABS versus hardened PVC for an engine-mounted box
  3. Question 3 Two applications where corrosion is an issue
  4. Question 4 Aluminium–lithium substitution for aircraft floor beams
  5. Question 5 Heat-treatment schemes for 1080 steel using the TTT diagram
  6. Question 6 Carbon diffusion through FCC and BCC iron
  7. Question 7 Magnesium sacrificial anode in a hot water heater
  8. Question 8 Tension test on an aluminium bar

Start with Question 1 →

Paper format. National Exams, May 2018 — 16-Mec-B8 Engineering Materials. Three hours, open book; any non-communicating calculator permitted. Eight problems, all of equal value; any five of the eight constitute a complete paper, so each problem is worth 20 marks. Candidates are urged to submit a clear statement of any assumptions made. All eight problems are solved below, because the set as a whole is the study resource.

Reference texts (22-Mec-B8 Engineering Materials).

  • Askeland & Wright, The Science and Engineering of Materials, 7th ed. — the primary syllabus text.
  • Callister & Rethwisch, Materials Science and Engineering: An Introduction, 10th ed.
  • Shackelford, Introduction to Materials Science for Engineers, 8th ed.
  • Fontana, Corrosion Engineering, 3rd ed. — galvanic series, sacrificial protection and Faraday's law.
  • Ashby, Materials Selection in Mechanical Design, 5th ed. — selection criteria and material indices.
  • Dieter, Mechanical Metallurgy, 3rd ed. — the tension test, true stress and necking.
  • Polmear, Light Alloys, 5th ed. — aluminium tempers, Al–Li alloys and maraging steels.
  • Strong, Fundamentals of Composites Manufacturing, 2nd ed. — FRP consolidation routes.

Note on this sitting. Two questions carry fresh data and have been re-worked from this paper's own numbers — the aluminium–lithium floor beams (Q4, where the ask is now a true/false test of an entire saving rather than a percentage, and the answer is that it is true with 65 kg to spare) and the magnesium anode (Q7, 0.9 kg in 14 years). Questions 6 and 8 are new to this subject: carbon diffusion through the two iron lattices, and a straightforward tension test.