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Structural Design - Materials and Manufacturing Process - Exam, Exams of Materials science

Birla Institute of Technology and ScienceMaterials science

Major Points are give below: Structural Design, Iron-Carbon Equilibrium, Transformation, Cooling Transformation, Steel, Eutectic Composition, Recrystallisation, Materials Involved, Structural Design, Environment

Typology: Exams

2012/2013

Uploaded on 04/13/2013

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Cork Institute of Technology
Bachelor of Engineering in Biomedical Engineering – Stage 2
(EBIME_7_Y2)
Summer 2008
(Materials Science) Materials & Manufacturing Process
(Time: 3 hours)
Answer 5 Questions Examiner: Mr. M. Walsh
All questions carry equal marks Mr. M. Murphy
Dr. G. McGuinness
Q1. (a) Label the parts on the Iron-Carbon equilibrium diagram in fig.1 (8 Marks)
(b) Explain the cooling transformation of steel at the eutectic composition. (6 Marks)
(c) Describe, with the aid of sketches, the theory of recrystallisation of metals due to cold
working (6 Marks)
Q2. (a) Discuss galvanic corrosion, giving examples of materials involved, include sketches.
(8 Marks)
(b) Discuss the factors affecting corrosion of ferrous metals under the following headings:
(i) Structural Design
(ii) Environment
(iii) Applied or internal Stress
(iv) Composition and Structure
(v) Temperature (12 Marks)
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Cork Institute of Technology

Bachelor of Engineering in Biomedical Engineering – Stage 2

(EBIME_7_Y2)

Summer 2008

(Materials Science) Materials & Manufacturing Process

(Time: 3 hours)

Answer 5 Questions Examiner: Mr. M. Walsh All questions carry equal marks Mr. M. Murphy Dr. G. McGuinness

Q1. (a) Label the parts on the Iron-Carbon equilibrium diagram in fig.1 (8 Marks)

(b) Explain the cooling transformation of steel at the eutectic composition. (6 Marks)

(c) Describe, with the aid of sketches, the theory of recrystallisation of metals due to cold working (6 Marks)

Q2. (a) Discuss galvanic corrosion, giving examples of materials involved, include sketches. (8 Marks)

(b) Discuss the factors affecting corrosion of ferrous metals under the following headings:

(i) Structural Design (ii) Environment (iii) Applied or internal Stress (iv) Composition and Structure (v) Temperature (12 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/M 2 tensile modulus for glass fibre 75GN/M 2 tensile strength of polyester 50MN/M 2 tensile strength of glass fibre 1500 MN/M^2 Cross-sectional area of component 300mm^2 (12 Marks)

(b) Show using sketches the effect of the direction of the grain on the strength of wood. (8 Marks)

Q4. (a) Discuss Tensile testing of polymers, include sketches. What is the Secant Modulus. Describe the properties of the polymers from the stress/strain graphs shown in fig (12 Marks)

(b) Give a brief description of 4 additives with regard to polymeric materials. (8 Marks)