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发表于 2009-9-25 16:53:45
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来自 香港
例:四边简支板,长度a=1000mm,宽度ay=500m,受轴向压力荷载NX=Ny=1N/mm,材料构成[(0/90)3]s,AS4D/9310复合板,纤维体积含量Vf=0.6,板厚10.2mm,单层弹性常数如表1所示, 试用ANSYS分析其特征临界荷载和失稳形状。
解 :采用LLS方法建立符合材料模型,采用shell91
/PREP7
uimp,1,ex,ey,ez,145880,13312,13312
uimp,1,gxy,gyz,gxz,4386,4529,4386
uimp,1,prxy,pryz,prxz,0.263,0.470,0.263
ET,1,SHELL91,,1
KEYOPT,1,5,1
R,1,12,1, ! 12 layers symmetrical
RMORE,,,,,,, !following is LSS information
RMORE,1,0,0.85 ! 1st layer: mat. #1, 0 deg, Th=0.85 mm
RMORE,1,90,0.85 ! 2nd layer: mat. #1, 90 deg, Th=0.85 mm
RMORE,1,0,0.85 ! 3nd layer: mat. #1, 0 deg, Th=0.85 mm
RMORE,1,90,0.85 ! 4th layer: mat. #1, 90 deg, Th=0.85 mm
RMORE,1,0,0.85 ! 5th layer: mat. #1, 0 deg, Th=0.85 mm
RMORE,1,90,0.85 ! 6th layer: mat. #1, 90 deg, Th=0.85 mm
! Geometry and mesh
RECTNG,0,500,0,250
ESIZE,,25
AMESH,all
FINISH
分析模块
/SOLU
ANTYPE,STATIC
PSTRESS,ON
DL,2,1,uz,0
DL,3,1,uz,0
DL,1,1,symm
DL,4,1,symm
!d,all,rotz
!Load application
SFL,2,PRES,1
SFL,3,PRES,1
SOLVE
FINISH
/SOLU ! Solution module, (ii) find the BIFURCATION LOADS
ANTYPE,BUCK
BUCOPT,SUBSP,10 ! Find the first 10 bifurcations loads
SOLVE ! Solve
FINISH ! Exit solution module
/SOLU ! Solution module, (ii) find the BUCKLING MODES
EXPASS
MXPAND
SOLVE ! Solve
FINISH ! Exit solution module
/POST1 ! Post-processor module
SET,LIST ! List the critical loads
SET,1,2 ! Set mode number 2 shape
PLDISP,1 ! Display the mode 2 shape displacements
FINISH ! Exit post-processor module |
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