Slide
12
We
now look at the behavior of a shaft made of a ductile material under
torsional loading. Hookes law applies only when the shear
stress is below the yield stress, tau y .The value of the torque
at the start of yield is given by T yield is equal to tau y times
J over r zero, where tau y is the shear yield strength of the material
and r zero is the outer radius of the shaft. Note also that the
outer surface yields first and then the plastic deformation progresses
to the center of the shaft as the torque increases.
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