Unformatted text preview: o C, and causes the particles to coarsen slowly. After 1000 hours they have grown to a diameter of 3 x 10-8 m and are spaced 18 x 10-8 m apart. Estimate the drop in yield strength. (The shear modulus of aluminum is 26 GN m-2 , and b = 0.286 nm.) 3. (1pt) The yield stress of a sample of brass with a large grain size 20 MN m-2 . The yield stress of an otherwise identical sample with a grain size of 4 μ m was 120 MN m-2 . 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
- Mechanical Engineering, Tensile strength, 2pts, 1pt, tensile yield strength, 0.286 nm