为什么位移和时间的关系曲线是直线?
各位大侠，我分析一个弧面的极限载荷，模型取四分之一圆弧面，壁厚0.6毫米，用SHELL63单元；材料是钢，用了双线性的材料模型代替真实本构关系；载荷是在一侧加1E6帕的压强，两半径我用了对称约束，圆周线固支。非线性求解后，用/POST26画了圆心那点的位移（沿压强方向）和时间的关系曲线，为什么关系曲线是直线呢?好象仍在弹性变形范围，但模型最大应力已经超过屈服应力值很多了呀，下面是命令流，高手指教一下，谢谢了。
/PREP7
ET,1,SHELL63
KEYOPT,1,1,0
KEYOPT,1,2,0
KEYOPT,1,3,0
KEYOPT,1,5,0
KEYOPT,1,6,0
KEYOPT,1,7,0
KEYOPT,1,8,0
KEYOPT,1,9,0
KEYOPT,1,11,0
R,1,0.0006, , , , , ,
RMORE, , , ,
RMORE
RMORE, ,
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,2e11
MPDATA,PRXY,1,,0.3
TB,BISO,1,1,2,
TBTEMP,0
TBDATA,,2.35E5,,,,,
K,1,0,0,0,
K,2,0,-0.01,0,
K,3,0,-0.02,0,
K,4,0.01,-0.02,0,
LSTR, 1, 2
LSTR, 2, 3
LSTR, 3, 4
K,5,0.01,0,0,
LFILLT,2,3,0.004, ,
LDELE, 3
FLST,2,3,4,ORDE,3
FITEM,2,1
FITEM,2,-2
FITEM,2,4
FLST,8,2,3
FITEM,8,1
FITEM,8,5
AROTAT,P51X, , , , , ,P51X, ,90, ,
FLST,2,3,5,ORDE,2
FITEM,2,1
FITEM,2,-3
AESIZE,P51X,0.001,
MSHAPE,1,2D
MSHKEY,0
FLST,5,3,5,ORDE,2
FITEM,5,1
FITEM,5,-3
CM,_Y,AREA
ASEL, , , ,P51X
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
AMESH,_Y1
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
/UI,MESH,OFF
NUMMRG,ALL,1e-7, , ,LOW
NUMCMP,ALL
FINISH
/SOLU
ANTYPE,0
FLST,2,6,4,ORDE,2
FITEM,2,1
FITEM,2,-6
DL,P51X, ,SYMM
FLST,2,1,4,ORDE,1
FITEM,2,9
/GO
DL,P51X, ,ALL,0
FLST,2,3,5,ORDE,2
FITEM,2,1
FITEM,2,-3
/GO
SFA,P51X,1,PRES,-1e6
alls
/SOLU
antype,static
outres,,1
nlgeom,on
kbc,0
nsubst,300
arclen,on,5
ALLSEL,ALL
SOLVE
FINISH
/POST26
NSOL,2,1,U,X
PRVAR,2 自己顶一下，高手指教。
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