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Applied Science 278 Midterm Examination – February 25, 2008 1 THE UNIVERSITY OF BRITISH COLUMBIA Department of Materials Engineering APSC 278 Engineering Materials MID-TERM EXAMINATION, February 25, 2008 Name: Student #: This is a closed book examination. Use of relevant material stored in programmable calculators prohibited. Answer all questions. Show all work and units. The complete exam is 8 pages in length
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Applied Science 278 Midterm Examination – February 25, 2008 2 1. Stress-strain Curves (8p) A standard tensile sample (meeting ASTM standards) with a gauge length of 60 mm was originally used as a demonstration for APSC 279 laboratory. For this sample, the change in length for at the necking point was measured to be 25 mm and the change in length between the necking point and failure was found to be 10 mm. i. calculate a. the percent uniform elongation b. percent total elongation Solution ii. later in the term, a lack of material led to redesign of the sample such that the gauge length was reduced to 30 mm. Assuming the material was exactly the same, predict the percent total elongation for this test. Solution The change in length up to necking is proportional to the gauge length and the post-necking change in length is independent of l o . Thus Total Elongation (%) =
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