Problem:
The Peierls-Nabarro stress, t=c*exp(-kd/b), where c and k are constants, b is the magnitude of the burger vector and d is the interplanar spacing between adjacent planes, describes the shear stress, t, that is required to move a dislocation from one equilibrium location to another. Several factors determine the most likely slip system that will be active. Discuss (how does the factor impact movement) the following with respect to the Peierls-Nabarro stress: length of the Burgers vector, interplanar spacing, materials with metallic bonding, materials with covalent bonding, and materials with ionic bonding.
Note: Show all workings.