Quiz4spring2004

# Quiz4spring2004 - ENSC 3313 Spring 2004 Quiz 4 ANSWERS Name...

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ENSC 3313, Spring 2004 Quiz 4 - ANSWERS Name ________________________________ Answer any 4 questions only , 1 point each 1. The stress-strain plot is from a flat specimen of 4 inch gauge length, 1 inch width, and 0.25 inch thickness. Determine a) the load at yielding (use the 0.2% offset method), b) the elastic modulus, and c) the maximum load this specimen can support before failure. Calculate all loads in units of lb f . Note: inset is the magnified low strain region. cross sectional area is 2 25 . 0 25 . 0 1 in A = × = (a) Draw a line from 0.002 strain parallel to linear portion. YS~232,000 psi. Thus, the load is f lb YS A P 000 , 58 = × = (b) At a strain of 0.005, the stress is 1000 MPa so E=1000/0.005=200 GPa (~29x10 6 psi) (c) Drawing a horizontal line from the max in the stress- strain curve over to the stress axis, I read: TS~1950 MPa (280,000 psi). Thus, the maximum supportable load is f lb TS A P 000 , 70 max = × = 2. Using the data below for aluminum, calculate the minimum thickness (

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Quiz4spring2004 - ENSC 3313 Spring 2004 Quiz 4 ANSWERS Name...

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