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Chapter 15: Combined Loads
M15.3: Principal Stresses in a Rectangular Tube Beam
Principal Stresses
State the Problem
Plan the Solution
Table of Contents
Equilibrium
Construct the Shear-force Diagram
Construct the Bending-moment Diagram
V and M Values at H
Bending Stress at H
Shear Stress at Point H
Stress Element at H
Principal Stresses
Maximum In-Plane Shear Stress
Finished
Try One
scene
11
of
14
Note that there are no shear stresses on the principal stress faces.
σ
p
1
=
+
1
.
05
M
P
a
θ
p
=
-
76
.
93
∘
σ
p
2
=
-
19
.
44
M
P
a
