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Strain S
Stress 6
Time t
Figure 4.4 Long-term stress-strain behavior [7]
Example [9]
Time /
Stress 6
Strain £
The minimum depth of the simple beam made of SAN shown in Figure 4.5 is to be
determined for the following conditions:
The beam should support a mid-span load of 11.13 N for 5 years without fracture and
without causing a deflection exceeding 2.54 mm.
Figure 4.5 Beam under midspan load [9]
Solution
The maximum stress is given by
a
b
c
(4.16)