[B=[4[N b5(1+n) 0 0 a(1+5) (i=1,2,3,4) a(1+5)b5(1+n,) 2.单元应力与应变 0/ax0 /a·a/a50 =00/0y=01/b。0/0n 0/00/axl/b-a/n1/a./02 s}=[4[N(5,n)P =[4[N[4N…by IBI Bk.Alloy 应变矩阵 =[B62.单元应力与应变   A d T  =                     =                   =     1/ / 1/ / 0 1/ / 1/ / 0 / / 0 / / 0 b a b a y x y x A T        T e  = A N(,)            T T e = A N 1 A N 2           e = B 1 B 2  B 4     e = B  应变矩阵      i T B i = A N ( 1,2,3,4) (1 ) (1 ) 0 (1 ) (1 ) 0 =           + + + + = i a b a b i i i i i i i i          