MME 2503 SEM 2 2013 2014 copy - MME 2501/2503 INTERNATIONAL...

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MME 2501/2503 1 INTERNATIONAL ISLAMIC UNIVERSITY MALAYSIA KULLIYYAH OF ENGINEERING END OF SEMESTER EXAMINATION SEMESTER II, 2013/2014 SESSION Programme : MATERIALS ENGINEERING Level of Study : UG 2 Time : 03:00 pm 06:00 pm Date: 23 rd of May 2014 Duration : 3 Hrs Course Code : MME 2501 / MME 2503 Section(s): 1, 2, 3, 4, 5 and 6 Course Title : Engineering Materials / Materials Science and Engineering This question paper consists of Nine (9) printed pages (including cover page) and one Appendix with Five (5) Questions. INSTRUCTION(S) TO CANDIDATES DO NOT OPEN UNTIL YOU ARE ASKED TO DO SO Answer any Four (4) out of Five (5) questions provided. Answers should be clear and intelligible. Justify your answer with simplification of intermediate steps for full marks. No book, notes and programmable calculator are permitted Total Marks for this paper is 100. Any form of cheating or attempt to cheat is a serious offence which may lead to dismissal
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MME 2501/2503 2 Q1 (25 Marks) a) A cylindrical specimen of steel having an original diameter of 12.8 mm is tensile tested to fracture and found to have an engineering fracture strength σ f of 460 MPa. If the cross sectional diameter at fracture are 10.7 mm, determine: i) The ductility in terms of percentage reduction in area (1 mark) ii) The engineering stress at fracture (2 marks) iii) The true stress at fracture (2 marks) b) Table Q1(b) consists of four materials with their mechanical properties. The length of a cylindrical rod is 380 mm long, having a diameter of 10.0 mm, is to be subjected to a tensile load of 24,500 N. i) Calculate the stress of the cylindrical rod (2 marks) ii) Compare with data given in Table Q1 which are the likely materials for the cylindrical rod if it does not experience plastic deformation? Justify your answer. (4 marks) iii) What is the likely material if the elongation is less than 0.9 mm? Justify your answer. (4 marks)
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MME 2501/2503 3 Table Q1(b) : Modulus of elasticity, yield strength and tensile strength of selected engineering materials Material Modulus of Elasticity (GPa) Yield Strength (MPa) Tensile Strength (Mpa) Aluminum alloy 70 255 420 Brass alloy 100 345 420 Copper 110 250 290 Steel alloy 207 450 550 c)
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