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FIGURE 12.1
Positive forces and moments are shown. This corresponds to Sign Convention 1 for simple beams.
FIGURE 12.2
Positive translations and rotations are shown.
takes the form [Chapter 2, Eq. (2.54)]
−
δ
W
=
V
(σ
x
δ
x
+
τ
xy
δγ
xy
+
τ
xz
δγ
xz
+
σ
y
δ
y
+
σ
z
δ
z
+
τ
yz
δγ
y
z
)
dV
Neglected
S
p
(δ
−
u
x
p
x
+
δ
u
y
p
y
+
δ
u
z
p
z
)
dS
=
0
(12.1)
The body force terms of Eq. (2.54) have been ignored.
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