________________________________________________________________________
PROBLEM (7.140) A steel rectangular beam (Fig. P7.139) is subjected to a moment 1.2 times
greater than My . Determine:
(a) The distance from the neutral axis to the point at which elastic core ends, yo .
(b) The residual stress pattern following release of loading.
(a) Equations (7.53) and (7.54):
2
0
31
1.2 [1 ( ) ]
232
y
y
M
Mh
== −
or
2
00
2
4
0.8 1 ( ), 0.387
3y
y
h
h
=− =
(b) The residual stress pattern will be as in Fig. 7.49c.
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