Polymerization - Material Science and Engineering - Exam, Exams of Material Engineering

Download Polymerization - 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 Autumn Examinations 2010/11 Module Title: Material Science Module Code: MECH6025 School: Mechanical & Process Engineering Programme Title: Bachelor of Engineering (Honours) in Sustainable Energy – Year 2 Bachelor of Engineering in Mechanical Engineering – Year 2 Bachelor of Engineering in Biomedical Engineering – Year 2 Programme Code: ESENT_8_Y2 EMECH_7_Y2 EBIME_7_Y2 External Examiner(s): Mr. G. Clerkin, Prof. D. FitzPatrick Internal Examiner(s): Mr Michael P O’Mahony, Ms Sally Bryan Instructions: Answer THREE questions Duration: 2 Hours Sitting: Autumn 2011 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) In the context of plain carbon steels describe: Pearlite AND Martensite Explain why Martensite does not appear on the Fe-C equilibrium diagram and Why Pearlite and martensite will NOT appear in the same microstructure (10 Marks) (b) What is a phase equilibrium diagram? Sketch and label the three different types of phase equilibrium diagram. Why they are important for heat treating plain carbon steels (8 Marks) (c) Explain “TEMPERING” and why it is necessary after the quenching operations (6 Marks) (d) Describe THREE effects of alloying in steels (9Marks) Q2. (a) Polymers are formed by a “Polymerization” process. This can be Addition or Condensation. Explain these processes and give an example of the type of polymers formed by these methods (10 Marks) (b) Using diagrams explain the types of structures for polymer chains (8 Marks) (c) What are the advantages and limitations of using composite materials over other materials. (6 Marks) (d) A continuous and aligned glass fibre-reinforced composite consists of 40% of glass fibre having a modulus of elasticity of 69GPa and 60% of a polyester resin that, when hardened, displays a modulas of 3.4GPa i) Compute the modulus of elasticity of the composite in the longitudinal direction ii) If the cross section area is 250mm 2 and a stress of 50MPa is applied in this longitudinal direction, compute the magnitude of the load carried by each of the phases. iii) If a modulas of 45GPa is required in the composite, what percentage glass fibre would be required (9 Marks)