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Unformatted text preview: f deformation
4. Orientation of active slip planes with
respect to the applied stress Critical Resolved Shear Stress
Slip begins within a single crystal (or a grain in a
polycrystal) when the shearing stress on the slip
plane in the slip direction reaches a required level
referred to as the critical resolved shear stress
(CRSS). At stress levels below this value, the
deformation remains elastic and no dislocation
motion occurs. Critical Resolved Shear Stress for Slip
τr = F cos λ
cos λ cos φ
Ao /cos φ Ao called Schmid ' s Law Example of Slip calculation Plastic Deformation of Polycrystals
Dislocations moving along on a particular slip
plane cannot go directly from one grain into
another grain in a straight line, unimpeded.
Slip lines change directions at grain boundar...
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- Fall '13