Cork Institute of Technology
Higher Certificate in Engineering in Biomedical Engineering โ Award
(National Certificate in Engineering in Biomedical Engineering โ Award)
(NFQ โ Level 6)
Summer 2005
Material Science
(Time: 3 Hours)
Answer 5 Questions.
All questions carry equal marks.
Examiners: Mr. M. Walsh
Mr. D. Tallon
Prof. P. McHugh
Q1. (a) Label the parts on the Iron-Carbon equilibrium diagram in fig.1. (8 marks)
(b) Explain how to perform the following heat treatment processes, and why they would be
carried out:
(i) Full Annealing
(ii) Normalising
(iii) Quench Hardening (12 marks)
Q2. (a) Describe with the aid of sketches the process of Galvanic/Electrolytic Corrosion
comparing Galvanised and Tin Plated steel. (6 marks)
(b) Describe 3 methods of producing a protective coating on steel. (6 marks)
(c) Explain how three of the following affect corrosion:
๎ Structural Design
๎ Environment
๎ Applied or internal stress
๎ Composition & structure
๎ Temperature (8 marks)
Q3. (a) Given the following data for a fibre-glass reinforced polyester component of rectangular
cross-section in which the strands lie parallel to the direction of loading, calculate:
(i) the matrix area fraction and the reinforcement area fraction
(ii) the tensile modulus of the composite
(iii) the tensile strength of the composite
average fibre diameter 0.005mm
number of fibres per strand 204
number of strands 51470
tensile modulus of polyester 4 GN/M2
