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Homework%20Assigment%201 - • Determine Y K and n 2 Take a...

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Homework Assignment 1 ISE 2204 Manufacturing Processes Due Date: February 12, 2009 Please include the Virginia Tech Honor Code pledge in the first page of your assignment and sign it. “I have neither given nor received unauthorized assistance on this assignment.” 1.- The following data are taken from an aluminum tension-test specimen: Elongation [in] Load , P [lbf] 0.0010 752 0.0020 810 0.1008 2310 0.2004 2580 0.3010 2680 0.4000 2740 0.5000 2770 0.6010 2760 0.7010 2710 0.8000 2480 0.9000 1943 0.9600 654 The specimen is cylindrical bar with D o = 0.500 in and l o = 2.2 in. Plot the engineering stress – engineering strain curve for the material. Plot the true stress-true strain curve (Please use Excel)
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Unformatted text preview: • Determine Y, K, and n. 2.- Take a cubic piece of metal with a side length lo and deform it plastically to the shape of a rectangular parallelepiped of dimensions l1, l2, and l3. Assuming that the material is rigid and perfectly plastic, show that the volume constancy requires that the following expression be satisfied: ε 1 + ε 2 + ε 3 = 0 3.- A metal is yielding plastically under the stress state shown in the figure. a) Label the principal axes according to their proper numerical convention. b) What is the yield stress using the Tresca criterion? c) What if the von Mises criterion is used? d) The stress state causes measured strains of ε 1 =0.4, and ε 2 =0.1. What is the value of ε 3 ?...
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  • Spring '08
  • RHSturges
  • Yield surface, 3rd millennium, Honor Code pledge, stress-true strain curve, aluminum tension-test specimen

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