ex_fin_w08 - ME 382 Winter 2008 FINAL EXAM MONDAY/TUESDAY,...

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ME 382 Winter 2008 FINAL EXAM MONDAY/TUESDAY, APRIL 20/21, 2008 This is a closed book exam; students are allowed one unmarked copy of the ME382 Data Book. Answer all 5 questions. Show all calculations for full credit. If you need more paper, staple it to the back of this exam. There are a total of 9 pages to this exam. Use a ruler / straight edge to read from graphs! Name (PRINTED): Circle Your Section: Prof. Garikipati Prof. Jones Honor Pledge:__________________________________________________________ _______________________________________________________________________ Signed: ____________________________ Problem Score 1 _______ 2 _______ 3 _______ 4 _______ 5 _______ 1
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Problem 1 (20pts). A bar made of a polymer is to be used in a high temperature application at 90C . It demonstrates time-dependent creep deformation expressed in terms of effective strain and effective stress of the form ) / exp( ~ 10 3 . 7 ~ 4 6 RT Q H H × = σ ε where Q = 150 kJ/mole , R = 8.31 J/K-mole and σ H is in MPa and temperature, T , is in Kelvin. The bar has a circular cross section of initial radius 10 cm , has initial length 2 m. Its axis is vertically-oriented and it is loaded by gravity. The acceleration due to gravity is 9.81 m/sec 2 . The alloy of which the bar is made has density 1200 kg/m 3 ,Young’s modulus 4 GPa and Poisson ratio 0.5 . Its yield stress is 70 MPa . a)
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This note was uploaded on 05/12/2010 for the course MECHENG 382 taught by Professor Thouless during the Winter '08 term at University of Michigan.

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ex_fin_w08 - ME 382 Winter 2008 FINAL EXAM MONDAY/TUESDAY,...

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