Experimentally, it has been observed for single crystals of a number of metals that the critical resolved shear stress Iuml crss is a function of the dislocation density Iuml D as here Iuml 0 and A are constants For copper, the critical resolved shear stress is 2 10 MPa (305 psi) at a dislocation d...

We are asked in this problem to compute the critical resolved shear stress at ...

Experimentally, it has been observed for single crystals of a number of metals that the critical resolved

Question:

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

here Ï„0 and A are constants. For copper, the critical resolved shear stress is 2.10 MPa (305 psi) at a dislocation density of 105 mm-2. If it is known that the value of A for copper is 6.35 Ã— 10-3 MPa-mm (0.92 psi-mm), compute the Ï„crss at a dislocation density of 107 mm-2.