Abaqus无限单元的建立方法

Abaqus无限单元的建立方法

i.什么是无限单元

无限单元是Abaqus单元库中的一种单元，它的单元形式如下图所示

二维无限单元三维无限单元

2.无限单元的作用

运用无限单元作为反射边界，将无反射，防止在边界上产生的应力波反射，重新进入模

型，从而导致结果不正确。

3.怎么建立无限单元

（1）先建立CAE模型，通过partition将须要设置为无限单元的部分分割，在mesh模

块中设置该部分单元类型，这样在inp文件中须要设置为无限单元的部分就会集中在一

起，便利修改其节点的编号依次。

（2）在inp文件里对无限单元进行单元属性及编号的变更，须要留意无限单元的方向，

在二维无限单元中，前两个节点所组成直线中点A与后两个节点所组成直线中点B,无

限单元的方向就是A指向B的方向，如图1,二维无限元的方向是朝下；在三维无限单

元中，前四个节点所组成平面的中心点C与后四个节点所组成平面的中心点D,无限单

元的方向就是C指向D的方向，如图1,三维无限单元的方向朝右。

（3）将修改后的inp导入，建立job提交就可以了。

4.实例讲解-钢丸撞击金属板

本人在做机械喷丸的模拟，其中设置金属板边界部分为无限单元：

（1）建立CAE,将金属板的边界partition切割，全部设置为C3D8R单元类型，修改边

界部分为C3D8I,建立job-writeinput生成inp文件。

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单元编号单元节点的编号

在inp的datalines中第一列是单元编号，后面的是节点编号，在本文中，无限单元的方

向是从金属板的中心向外。View-AssemblyDisplayOption-Mesh-shownodelabels（显示节

点编号），showelementlabels（显示单元编号），在mesh模块中可以看到各个单元的编

号和节点的编号，随意找一个单元查看，750,710,114,113,621,158,12,9,141,

在网格显示中，750单元的节点编号依次如上图所示，在此，无限单元的方向是朝右,

inp修改的内容如下图。

C3D8

CIN3D8

而inp中的编号排列是750,710,114,113,621,158,12,9,141,所以须要进行修改,

将12,158,710,114（逆时针排列）四个节点编号放在后面，而且12与9在一条直线上，

改为750,621,113,9,141,710,114,12,158。对于大范围节点编号依次的修改，建议

接受UltraEdit软件，列-列模式进行批量修改。

（3）导入inp文件，建立job提交就可以了。

，留意事项：在interaction和load模块中，定义面的时候不要将无限单元定义在里面，因为

在修改单元编号时，也把面重新定义了，在提交inp文件时出现错误abaqus:ErrorinjobJ

ob-6:THEFACES6ISNOTVALIDFORTHEUNDERLYINGELEMENT56INSTANCEPART-5-1,

即某个面包含了无限单元，导致不能运算。

修改好的无限单元为:

运算后

修改前

*Heading

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