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ansys关于槽钢公式计算和有限元计算结果的差异问题

作者 lolo123
来源: 小木虫 150 3 举报帖子
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小弟最近在琢磨槽钢的简单计算,发现一个问题,就是理论计算上的挠度和有限元的结果(beam和solid单元分别都使用了)一直对照不上,基本上是差一倍的偏差。但是用对称的型钢,比如方钢,工字钢两者计算就没这个问题,不知是什么原因。以下是公式计算和有限元计算结果,载荷就是型钢的自重,最终结果要显示截面的云图(所以beam3,beam4就不考虑使用了)。有懂的虫友,请赐教。
!!!!***************上梁采用18#a槽钢(梁单元计算)*****************
finish
/clear
/prep7
et,1,188
mp,ex,1,2.0e11
mp,dens,1,7800
mp,prxy,1,0.3
SECTYPE,   1, BEAM, CHAN, , 0   
SECOFFSET, CENT
SECDATA,68/1000,68/1000,180/1000,10.5/1000,10.5/1000,7/1000,0,0,0,0

k,
k,2,2330/1000
k,3,,200/1000
k,4,2330/1000,-200/1000

l,1,2

wpoff,0.555
wprot,,,-90
lsbw,all

wpoff,,,-1.22
lsbw,all
kwpave,1,2
lsbw,all

NUMMRG,ALL
NUMCMP,ALL

/eshape,1

/VIEW,1,1,1,1   
/ANG,1  
/REP,FAS

LESIZE,1, , ,20, , , , ,1
LESIZE,2, , ,20, , , , ,1
LESIZE,3, , ,30, , , , ,1
LESIZE,4, , ,30, , , , ,1
latt,1,,1,,3,,1
lmesh,1
latt,1,,1,,4,,1
lmesh,2
latt,1,,1,,4,,1
lmesh,3
latt,1,,1,,3,,1
lmesh,4
eplot

/solu

!FK,2,FY,14500
acel,0,9.8,0
DK,1, , , ,0,ALL, , , , , ,  
!DK,2, , , ,0,UY,UZ,ROTX,ROTY,ROTZ, ,
alls

/solu
eqslv,PCG,1e-3 !选择PCG算法
msave,on
solve

/post1
/dsacle,all,1
PLNSOL, U,Y, 0,1.0  


!!!!***************上梁采用18#a槽钢(实体单元计算)*****************
finish
/clear
/prep7
et,1,95
mp,ex,1,2e11
mp,dens,1,7800
mp,prxy,1,0.3

BLOCK,0,2.33,90/1000,-90/1000,63/2/1000,-63/2/1000,

BLOCK,0,2.33,90/1000-10.5/1000,-90/1000+10.5/1000,63/2/1000,-63/2/1000+7/1000,  

vsbv,1,2

aesize,all,0.025/2
vsweep,all



/solu
asel,,,,15
nsla,s
d,all,all
alls
wpcsys,-1,0
csys,4
KWPAVE,3,4,6,7  
nsel,s,loc,x,0,0
*GET,nn,NODE,,COUNT
F,ALL,FY,14500/nn
alls

solve

/post1
/dscale,all,1
PLNSOL, U,Y, 0,1.0  


finish
/clear
/prep7
et,1,95
mp,ex,1,2e11
mp,dens,1,7800
mp,prxy,1,0.3

BLOCK,0,2.33,90/1000,-90/1000,63/2/1000,-63/2/1000,

BLOCK,0,2.33,90/1000-10.5/1000,-90/1000+10.5/1000,63/2/1000,-63/2/1000+7/1000,  

vsbv,1,2

aesize,all,0.025/2
vsweep,all



alls
et,2,MASS21
r,2,0,0,0, , , ,

wpcsys,-1,0
csys,4
KWPAVE,3,4,6,7  
n,1e6,0,0,0         !定义质量单元节点位置
TYPE,2
REAL,2  
E,1e6


nsel,s,loc,x,0,0
CM,NP,node
NSEL,A,NODE,,1e6
CERIG,1e6,ALL,UXYZ
alls

/solu
asel,,,,15
nsla,s
d,all,all
alls
acel,0,9.8,0
!F,1e6,FY,14500
alls

solve

/post1
/dscale,all,1
PLNSOL, U,Y, 0,1.0

ansys关于槽钢公式计算和有限元计算结果的差异问题
QQ截图20180802093608.png 返回小木虫查看更多

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  • 精华评论
  • lolo123

    BLOCK,0,2.33,90/1000,-90/1000,63/2/1000,-63/2/1000,更正为
    BLOCK,0,2.33,90/1000,-90/1000,68/2/1000,-68/2/1000,

  • lolo123

    BLOCK,0,2.33,90/1000-10.5/1000,-90/1000+10.5/1000,63/2/1000,-63/2/1000+7/1000,  更正为
    BLOCK,0,2.33,90/1000-10.5/1000,-90/1000+10.5/1000,68/2/1000,-68/2/1000+7/1000,

  • lolo123

    实体单元分析更正为:
    finish
    /clear
    /prep7
    et,1,95
    mp,ex,1,2e11
    mp,dens,1,7800
    mp,prxy,1,0.3

    BLOCK,0,2.33,90/1000,-90/1000,68/2/1000,-68/2/1000,

    BLOCK,0,2.33,90/1000-10.5/1000,-90/1000+10.5/1000,68/2/1000,-68/2/1000+7/1000,  

    vsbv,1,2

    aesize,all,0.025/2
    vsweep,all


    /solu
    asel,,,,15
    nsla,s
    d,all,all
    alls
    acel,0,9.8,0
    alls

    solve

    /post1
    /DSCALE,ALL,1.0
    PLNSOL, U,Y, 0,1.0,

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