Experimentally, it has been observed for single crystals of a number of metals that the critical resolved shear stress τcrss is a function of the dislocation density ρD as
where t0 and A are constants. For copper, the critical resolved shear stress is 0.69 MPa (100 psi) at a dislocation density of 104 mm–2. If it is known that the value of t0 for copper is 0.069 MPa (10 psi), compute τcrss at a dislocation density of 106 mm–2.
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