HW8 ENME382 S10 Section0201

HW8 ENME382 S10 Section0201 - ENME 382 Section 0201...

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ENME 382 Section 0201 Homework 8 Due in class: April 26, 2010 1 a) The critical resolved shear stress for copper is 0.48 MPa (70 psi). Determine the minimum possible yield strength for a single crystal of Cu pulled in tension. bi) A single crystal of a metal that has the BCC crystal structure is oriented such that a tensile stress is applied in the [100] direction. If the magnitude of this stress is 4.0 MPa, compute the resolved shear stress in the [1 1 1] direction on each of the (110), (011), and (10 1 ) planes. bii) On the basis of these resolved shear stress values, which slip system(s) is (are) most favorably oriented? 2. Briefly explain how each of the following influences the tensile or yield strength of a semicrystalline polymer and why: (a) Molecular weight (b) Degree of crystallinity (c) Deformation by drawing (d) Annealing of an undeformed material Think about why this question refers specifically to semicrystalline polymers. 3. A cylindrical rod of 1040 steel originally 11.4 mm (0.45 in.) in diameter is to be cold worked by
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HW8 ENME382 S10 Section0201 - ENME 382 Section 0201...

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