Abaqus无限单元的建立方法

Abaqus无限单元的建立方法1. 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2. 无限单元的作用使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将需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文件中需要设置为无限单元的部分就会集中在一起，方便修改其节点的编号顺序。（2）在inp文件里对无限单元进行单元属性及编号的改变，需要注意无限单元的方向，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-write input 生成inp文件。（2）修改inp文件的单元属性及编号将C3D8修改为CIN3D8，下一步修改无限单元节点编号的排列顺序在inp的data lines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-Assembly Display Option-Mesh-show node labels（显示节点编号），show element labels（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，任意找一个单元查看，750, 710, 114, 113, 621, 158, 12, 9, 141，在网格显示中，750单元的节点编号顺序如上图所示，在此，无限单元的方向是朝右，inp修改的内容如下图。而inp中的编号排列是750, 710, 114, 113, 621, 158, 12, 9, 141，所以需要进行修改，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顺序的修改，建议采用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。注意事项：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: Error in job Job-6: THE FACE S6 IS NOT VALID FOR THE UNDERLYING ELEMENT 56 INSTANCE PART-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* Job name: Job-1 Model name: Model-1* Generated by: Abaqus/CAE 6.10-1*Preprint, echo=NO, model=NO, history=NO, contact=NO* PARTS*Part, name=Part-2*Node 1, 0., 0., 1.5 2, 0., 2., 1.5 3, -2., 0., 1.5 4, 0., 2., 0. 5, 0., 0., 0. 6, -2., 0., 0. 7, 0., 2.5, 1.5 8, 0., 2.5, 0. 9, 2., 0., 1.5 10, 2., 0., 0. 11, 2.5, 0., 0. 12, 2.5, 0., 1.5 13, -2.5, 0., 1.5 14, -2.5, 0., 0. 15, 0., 0.0786545798, 1.5 16, 0., 0.172710776, 1.5 17, 0., 0.285184383, 1.5 18, 0., 0.419681847, 1.5 19, 0., 0.580515683, 1.5 20, 0., 0.772842824, 1.5 21, 0., 1.00283027, 1.5 22, 0., 1.27785218, 1.5 23, 0., 1.60672712, 1.5 24, -0.312868923, 1.97537673, 1.5 25, -0.618034005, 1.90211308, 1.5 26, 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