________________________________________________________________________
PROBLEM (7.155) Rework Prob. 7.154 for the beam of the cross section shown in Fig. P7.152.
SOLUTION
From solution of Prob. 7.152:
64
13.5 10 56.25
zyp
I
mM kN
−
=× = ⋅m
From solution of Prob. 12.27: 1.4.f
=
1.4(56.25) 78.25
pyp
M
fM kN m==⋅
=
Elastic rebound stress
3
max 6
78.25 10 (0.06)
'13.5 10
Mc
I
σ
−
×
== ×
The results are shown below.
M
P
Loading
=
M
P
+
M
P =0
Residual
stresses
y
x
-250 MPa 347.8 MPa
60 m
m
-97.8 MPa
97.8 MPa
250 MPa 347.8MPa
Unloading
250
-250
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