Unformatted text preview: o C, and causes the particles to coarsen slowly. After 1000 hours they have grown to a diameter of 3 x 108 m and are spaced 18 x 108 m apart. Estimate the drop in yield strength. (The shear modulus of aluminum is 26 GN m2 , and b = 0.286 nm.) 3. (1pt) The yield stress of a sample of brass with a large grain size 20 MN m2 . The yield stress of an otherwise identical sample with a grain size of 4 μ m was 120 MN m2 . Why did the yield stress increase in this way? What is the value of β in equation (10.5) for the brass?...
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 Spring '09
 Asst.Prof.A.FethiOkyar
 Mechanical Engineering, Tensile strength, 2pts, 1pt, tensile yield strength, 0.286 nm

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