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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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