# hw2sol - ME363 1. Homework#2Solution 2010 Point 3 8 = 0.356...

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ME363 Homework #2 Solution 2010 1. Point 3 8 0.356 22.5 14.5 ln 0.44 22.5 c e ε == Point no. h, mm P, kN A, mm^2 stress, Mpaeng. Straintrue strain 0 22.5 0 177 0 0 0 1 20.5 115 194 593 0.089 0.093 2 17.5 158 227 696 0.222 0.251 3 14.5 200 274 730 0.356 0.439 4 12.5 235 318 739 0.444 0.588 5 10.5 290 379 765 0.533 0.762 6 8.5 370 468 791 0.622 0.973 400 450 500 550 600 650 700 750 800 850 0 0.2 0.4 0.6 0.8 1 eng stress-strain True stress-strain

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2. () ( ) ( ) 0.5 0.5 -0 . 5 - . 5 70,000 0.5 49,497 25,000 0.5 17,678 0.6 0.364 0.3 0.182 . 49.497 0.364 17.678 0.182 21,23 uA uB o neck n neck o AA n n neck o BB uA neck uB neck AB psi psi A nn A e e e e Max tensile load σ σσ == = = = =+ = A 4 . lbs 2 2 i n i n
3. ) ) () )( ) 0 0.3 1 0 1.2 2 2 0.2 1 145,000 0.3 28,493 1.2 1 2 1 30,000,000 0.02 6,000 2 145,000 0.02 105,093 5 f n n y n uu a Toughness n psi b Modulus of resilience

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hw2sol - ME363 1. Homework#2Solution 2010 Point 3 8 = 0.356...

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