The uniform stress condition pictured in Fig. 1-2d exists throughout
9 m, y7 F. |: D7 g& sthe length of the bar except near the ends. The stress distribution at the+ }3 ^- _' r8 T9 O
end of a bar depends upon how the load P is transmitted to the bar. If the
5 H$ D& A& H3 b$ R8 x7 ]load happens to be distributed uniformly over the end, then the stress. H3 I/ N4 Q5 h6 l6 Q7 O
pattern at the end will be the same as everywhere else. However, it is
& O' f; e1 M- s* A4 X$ Z! cmore likely that the load is transmitted through a pin or a bolt, producing: W8 O& c# h1 S# ^! e5 v+ n
high localized stresses called stress concentrations.
1 J: W) k; y! D, A$ f" u, H$ K1 }
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发表于 2015-9-7 09:26:10
