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practice_mt - Materials Science and Engineering 564...

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1/9 Materials Science and Engineering 564 Mechanical behavior and microstructure Winter 2007 Midterm Exam February 16, 2007 Instructions: Enter your 4 digit course code here: _____________ You have approximately 50 minutes to complete this exam. Answer all 8 questions. Write your answers in the spaces provided. Always provide complete answers, including units where applicable. Work you show may count for partial credit. You may use your one-sided sheet of personal notes and a calculator. The point values for each question are given below. Good luck! 1: __/12 2: __/12 3: __/10 4: __/10 5: __/10 6: __/12 7: __/10 8: __/24 TOTAL: ______/100
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MSE 564 Midterm Feb. 16, 2007 page 2 / 9pages total 1. Engineering versus True Strain (12 points) Company A takes a bar of length L 1 and imposes a strain of –0.15, thereby changing the length to L 2 . The bar of length L 2 is then shipped to Company B where a strain of 0.15 is imposed, changing the length to L 3 = 1 m. a. Calculate the initial length L 1 to 4 significant figures, assuming engineering strains were imposed. Answer (a): b. Calculate the initial length L 1 to 4 significant figures, assuming true strains were imposed.
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