Abaqus無限單元的建立方法

i.什么是無限單元

無限單元是Abaqus單元庫中的一種單元，它的單元形式如下圖所示

二維無限單元三維無限單元

2.無限單元的作用

運用無限單元作為反射邊界，將無反射，防止在邊界上產生的應力波反射，重新進入模

型，從而導致結果不正確。

3.怎么建立無限單元

（1）先建立CAE模型，通過partition將須要設置為無限單元的部分分割，在mesh模

塊中設置該部分單元類型，這樣在inp文件中須要設置為無限單元的部分就會集中在一

起，便利修改其節(jié)點的編號依次。

（2）在inp文件里對無限單元進行單元屬性及編號的變更，須要留意無限單元的方向，

在二維無限單元中，前兩個節(jié)點所組成直線中點A與后兩個節(jié)點所組成直線中點B,無

限單元的方向就是A指向B的方向，如圖1,二維無限元的方向是朝下；在三維無限單

元中，前四個節(jié)點所組成平面的中心點C與后四個節(jié)點所組成平面的中心點D,無限單

元的方向就是C指向D的方向，如圖1,三維無限單元的方向朝右。

（3）將修改后的inp導入，建立job提交就可以了。

4.實例講解-鋼丸撞擊金屬板

本人在做機械噴丸的模擬，其中設置金屬板邊界部分為無限單元：

（1）建立CAE,將金屬板的邊界partition切割，全部設置為C3D8R單元類型，修改邊

界部分為C3D8I,建立job-writeinput生成inp文件。

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單元編號單元節(jié)點的編號

在inp的datalines中第一列是單元編號，后面的是節(jié)點編號，在本文中，無限單元的方

向是從金屬板的中心向外。View-AssemblyDisplayOption-Mesh-shownodelabels（顯示節(jié)

點編號），showelementlabels（顯示單元編號），在mesh模塊中可以看到各個單元的編

號和節(jié)點的編號，隨意找一個單元查看，750,710,114,113,621,158,12,9,141,

在網(wǎng)格顯示中，750單元的節(jié)點編號依次如上圖所示，在此，無限單元的方向是朝右,

inp修改的內容如下圖。

C3D8

CIN3D8

而inp中的編號排列是750,710,114,113,621,158,12,9,141,所以須要進行修改,

將12,158,710,114（逆時針排列）四個節(jié)點編號放在后面，而且12與9在一條直線上，

改為750,621,113,9,141,710,114,12,158。對于大范圍節(jié)點編號依次的修改，建議

接受UltraEdit軟件，列-列模式進行批量修改。

（3）導入inp文件，建立job提交就可以了。

，留意事項：在interaction和load模塊中，定義面的時候不要將無限單元定義在里面，因為

在修改單元編號時，也把面重新定義了，在提交inp文件時出現(xiàn)錯誤abaqus:ErrorinjobJ

ob-6:THEFACES6ISNOTVALIDFORTHEUNDERLYINGELEMENT56INSTANCEPART-5-1,

即某個面包含了無限單元，導致不能運算。

修改好的無限單元為:

運算后

修改前

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