11.91: The normal component of the force is θ F cos and the area (the intersection of the red plane and the bar in Figure (11.52)) is , cos / θ A so the normal stress is . cos ) ( 2 θ A F b) The tangential component of the force is , sin θ F so the shear stress is . cos sin ) A F ( θ θ c) θ 2 cos is a maximum when 0. or 1, cos
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