PPT Slide
where NL is the total length of the dislocation line and ? is the dislocation density, NL/L-3. In units of length per unit volume. The shear strain is then the product of the dislocation density (the number of dislocations that have moved), the Burgers vector, and the average distance each dislocation has moved. If the shear strain ?b occurs over a time t, then we can write