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标题: 【题目】超弹非线形分析(1到2分） [打印本页]

作者: sfszj 时间: 2003-12-18 22:31
标题: 【题目】超弹非线形分析(1到2分）
一轴对称橡胶堆，边界条件如图，分析反力－位移曲线!
V＝0.499
E＝2e5
单轴压缩数据
应变：-0.45,-0.4,-0.35,-0.3,-0.25,-0.2,-0.15,-0.1,-0.05
应力：-256,-128,-64,-32,-16,-8,-4,-2,-1

单轴拉伸数据
应变：0.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9
应力：0.0,1,1.5,2.0,2.9,3.6,5,7.5,9.7,17

体积试验数据
1 0
0.99 20

作者: 1wjlin 时间: 2003-12-21 15:26
Do you mind to explain the V symbol and Volumetric experiment data?
Thanks!!

作者: sfszj 时间: 2003-12-21 16:54

1wjlin wrote:
Do you mind to explain the V symbol and Volumetric experiment data?
Thanks!!

https://www.icax.org/viewthread. ... %3D1&page=#pid=&age=60[/url]

作者: 1wjlin 时间: 2003-12-21 21:58
Thanks!! I have seen it but I still get some of question as listed below,

1. ....体积试验数据有所不同，每一行两个数据同样用空格隔开，第二个数为静水压力，但第一个数不是体积应变e，而是相对体积，即1+e (<--- ???)，例如体积应变为-0.01，则应该在第一列输入0.99。而且程序假定体积试验为线性关系，拟合时也只拟合出一条直线，所以通常输入两个值即可。数据符号：使体积减小的静水压力为正，这需要注意，如下例：
0 0    <------ Error? or should be  1 0
0.99 20

2. ...mooney还有其他一些推导基于几乎不可压缩，所以对mooney模型而言，输入参数时一定要注意其泊松比应该接近0.5，一般大于0.49。 <---- Error?? Your proxy V=-0.499

I am sorry about these questions but I also want to solve your question for personal interesting!! I hope that you don't mind it.

作者: sfszj 时间: 2003-12-22 09:28

1wjlin wrote:
Thanks!! I have seen it but I still get some of question as listed below,
  
  1. ....体积试验数据有所不同，每一行两个数据同样用空格隔开，第二个数为静水压力，但第一个数不是体积应变e，而是相对体积，即1+e (<--- ???)，例如体积应变为-0.01，则应该在第一列输入0.99。而且程序假定体积试验为线性关系，拟合时也只拟合出一条直线，所以通常输入两个值即可。数据符号：使体积减小的静水压力为正，这需要注意，如下例：
  0 0    <------ Error? or should be  1 0
  0.99 20
  
  2. ...mooney还有其他一些推导基于几乎不可压缩，所以对mooney模型而言，输入参数时一定要注意其泊松比应该接近0.5，一般大于0.49。 <---- Error?? Your proxy V=-0.499
  
  I am sorry about these questions but I also want to solve your question for personal interesting!! I hope that you don't mind it.

Sorry!
有两个错误：
泊松比=0.499
关于超弹新功能介绍原文有误：
例子应该为：
1 0
0。99 20
谢谢你的细心！

作者: 1wjlin 时间: 2003-12-24 06:50
Dear CAE Master,
  I draw the model on Solidworks and output ACIS format, however,
I still can not solve it since I only can get the compression value on -0.03 meter(not -50 mm). The code is listed below. I would appreciate that you can help me to check and solve it. Thanks!!

ET,1,PLANE183 !* element 183
!*
!*
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,2e5
MPDATA,PRXY,1,,0.499
*CREATE,file1.UNIA    !* <-- input compression and tension data
  -0.45 -256
  -0.4 -128
  -0.35 -64
  -0.3 -32
  -0.25 -16
  -0.2 -8
  -0.15 -4
  -0.1 -2
  -0.05 -1
  0 0
  0.1 1
  0.2 1.5
  0.3 2.0
  0.4 2.9
  0.5 3.6
  0.6 5
  0.7 4.5
  0.8 9.7
  0.9 17
*END
TBFT,EADD,1,UNIA,file1.UNIA
/DELETE,file1.UNIA
*CREATE,file1.VOLU
  1 0
  0.99 20
*END
TBFT,EADD,1,VOLU,file1.VOLU
/DELETE,file1.VOLU
TBFT,FADD,1,HYPER,MOON,9
TBFT,SOLVE,1,HYPER,MOON,9,1
TBFT,FSET,1,HYPER,MOON,9
~SATIN,Surface,SAT,'..\',SOLIDS,0
/NOPR
/GO
FINISH
/PREP7
SMRT,3
MSHAPE,0,2D
MSHKEY,0
!*
CM,_Y,AREA
ASEL, , , ,    1
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
!*
AMESH,_Y1
!*
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
!*
FINISH
/SOL
ANTYPE,0
ANTYPE,0
NLGEOM,1
CUTCONTROL,NOITERPRED,1
FLST,2,1,4,ORDE,1
FITEM,2,3
!*
/GO
DL,P51X, ,UY,0             !*<- boundary constraint on bottom line
DL,    2, ,SYMM          !*<- boundary constraint on left line symm
FLST,2,1,4,ORDE,1
FITEM,2,1
!*
/GO
DL,P51X, ,UY,-0.05  !*<- boundary constraint on top line by moving down 50
/STATUS,SOLU
/STATUS,SOLU
SOLVE

作者: sfszj 时间: 2003-12-24 15:58
命令流我不会啊，但粗看了一下，好像没有做接触啊，

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