Question: Experimentally, it has been observed for single crystals of a number of metals that the critical resolved shear stress crss is a function of

Experimentally, it has been observed for single crystals of a number of metals that the critical resolved shear stress τ_crss is a function of the dislocation density ρ_D as

where τ₀ and A are constants. For copper, the critical resolved shear stress is 2.10MPa (305psi) at a dislocation density of 10⁵ mm^-2. If it is known that the value of A for copper is 6.35 × 10^-3MPa-mm (0.92psi-mm), compute the t_crss at a dislocation density of 10⁷ mm^-2.

:- + p A. crss

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