Erosion Corrosion - Material Science and Engineering - Exam, Exams of Material Engineering

Download Erosion Corrosion - Material Science and Engineering - Exam and more Exams Material Engineering in PDF only on Docsity! Page 1 of 3 CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Semester 1 Examinations 2010/11 Material Science Module Code: MECH6025 School: Mechanical & Process Engineering Programme Title: BEng (Hons) Sustainable Energy Programme Code: ESENT_8_Y2 External Examiner(s): Dr Eugene Coyle, Mr Richard Linger Internal Examiner(s): Michael P O’Mahony Instructions: Answer THREE questions Duration: 2 Hours Sitting: Winter 2010 Requirements for this examination: Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator. Page 2 of 3 Q1. (a) Describe the THREE primary types of bonding (6 Marks) (b) List THREE defects found in crystalline solids and expand on ONE (7 Marks) (c) Explain the structural changes which take place for a 0.5% plain carbon steel when: It is heated from room temperature to 950 o C It is quenched from 950 o C in water to room temperature (10 Marks) (d) Explain “TEMPERING” and why it is necessary after the quenching operation above (5 Marks) (e) Why is necessary to let a steel specimen “SOAK” at the high temperature and what determines how long it needs (5 marks) Q2 (a) Explain the difference between Thermoplastic and Thermosetting polymers (3 marks) (b) Illustrate, with diagrams, the arrangements for COPOLYMERS (8 Marks) (c) Describe ONE of the following polymer manufacturing methods and indicate the types of products made by this method (10 Marks) Extrusion Injection moulding (d) What are the advantages and limitations of using composite materials over other materials (7 Marks) (e) A golf club shaft is made from a carbon-fibre composite with continuous fibres of modulus 180GN/m 2 arranged parallel to the axis of the shaft. If the volume fraction of fibers is 80% and the modulus of the matrix material is 3GN/m 2 , what is the modulus of the shaft material along the fiber axis? (5 marks) Q3 a) Briefy describe THREE of the following type of corrosion: (15 Marks) Uniform Corrosion Stress corrosion Cracking Erosion Corrosion Biological Corrosion (b) Explain FIVE factors that affect corrosion of metals (10 Marks) (c) Describe TWO ways to prevent corrosion of steel (8 Marks)