재료공학 I (2nd Examination)

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1. Suppose that yielding occurs in a single crystal of Cu when a critical resolved shear stress τ=10,000 psi is produced on {110} type slip planes along a <111> type direction. If the tensile axis coincides with a <100> direction, what minimum axial stress must be applied to cause yielding on a {110} plane in a <111> direction.

2. Suppose that plastic deformation occurs at the tip of a crack when the local stress reaches the tensile yield strength. If yield stress σ= 35,000 psi, what axial stress is required to cause local yielding if a crack 0.5 in. long, having ρ=0.001 in., is present

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