The uniform stress condition pictured in Fig. 1-2d exists throughout& L; m# H0 u6 P% t; H" C
the length of the bar except near the ends. The stress distribution at the" Y8 d. q1 ~2 d5 X$ {
end of a bar depends upon how the load P is transmitted to the bar. If the
& t2 l6 y! l- s: g( A9 O5 Y$ Fload happens to be distributed uniformly over the end, then the stress) C9 u- f! I) Y: ~
pattern at the end will be the same as everywhere else. However, it is
3 V# @: B9 L' C% }; a- @7 U. K7 Qmore likely that the load is transmitted through a pin or a bolt, producing: P- _ C1 i# |: M
high localized stresses called stress concentrations.
8 l. |* P9 {, O- ]9 B( a
# \0 H1 F5 M. n. \ |
发表于 2015-9-7 09:26:10
