Question: A Frank - Read source is operating in a fcc crystal which has a shear modulus of 5 0 GPa. If the dislocation pinning points

A Frank-Read source is operating in a fcc crystal which has a shear modulus of 50 GPa. If the dislocation pinning points are 2 microns apart and the magnitude of the dislocation burgers vector is 0.4 nm, determine the shear stress, in units of MPa, required to operate the source.

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