PPT Slide

Example: An NaCl single crystal is loaded in uniaxial compression with the [001] direction parallel to the compression axis. Dislocation motion is first observed on the slip system when the applied tensile stress is 500 psi. Calculate the inherent lattice resistance to dislocation motion.

Solution: The resolved shear stress on the slip system is given by Eq.(6.7), where

or for slip since . The shear stress necessary to overcome the inherent lattice resistance to dislocation motion is therefore 250 psi.

Example: An NaCl single crystal is loaded in uniaxial compression with the [001] direction parallel to the compression axis. Dislocation motion is first observed on the slip system when the applied tensile stress is 500 psi. Calculate the inherent lattice resistance to dislocation motion.