APSC278 2005 -

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                                 
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Applied Science 278 December Exam - 2005 1 THE UNIVERSITY OF BRITISH COLUMBIA Department of Materials Engineering APPLIED SCIENCE 278 Engineering Materials FINAL EXAMINATION, December, 2005 This is a Closed Book Examination. The use of calculators containing stored information of relevance to this course is forbidden. Time: 2.5 hours Answer 4 of 5 questions. Only 4 questions will be marked. Each question is worth 25 marks. The complete exam is 10 pages in length. Some useful formulae, material data and phase diagrams are given on the last 5 pages of the exam. The use of sketches or schematic diagrams is encouraged wherever these will aid in solving or discussing a problem. Marks 1. – Testing of Materials (6) a) An unknown metal is loaded in compression. The initial diameter was 10 mm and the diameter under a compressive load of 50 kN was 10.03 mm. Determine the modulus of elasticity for this material, given Poisson’s ratio = 0.3. (4) b) we have seen that metals have a maximum elastic strain of 1 % whereas elastomers can sustain elastic strains of greater than 500 %. Comment on the origin of this difference, clearly identifying the relevant atomic mechanisms for each class of material.
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