Abaqus無(wú)限單元的建立方法

Abaqus無(wú)限單元的建立方法

i.什么是無(wú)限單元

無(wú)限單元是Abaqus單元庫(kù)中的一種單元，它的單元形式如下圖所示

二維無(wú)限單元三維無(wú)限單元

2.無(wú)限單元的作用

運(yùn)用無(wú)限單元作為反射邊界，將無(wú)反射，防止在邊界上產(chǎn)生的應(yīng)力波反射，重新進(jìn)入模

型，從而導(dǎo)致結(jié)果不正確。

3.怎么建立無(wú)限單元

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

塊中設(shè)置該部分單元類型，這樣在inp文件中須要設(shè)置為無(wú)限單元的部分就會(huì)集中在一

起，便利修改其節(jié)點(diǎn)的編號(hào)依次。

（2）在inp文件里對(duì)無(wú)限單元進(jìn)行單元屬性及編號(hào)的變更，須要留意無(wú)限單元的方向，

在二維無(wú)限單元中，前兩個(gè)節(jié)點(diǎn)所組成直線中點(diǎn)A與后兩個(gè)節(jié)點(diǎn)所組成直線中點(diǎn)B,無(wú)

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

元中，前四個(gè)節(jié)點(diǎn)所組成平面的中心點(diǎn)C與后四個(gè)節(jié)點(diǎn)所組成平面的中心點(diǎn)D,無(wú)限單

元的方向就是C指向D的方向，如圖1,三維無(wú)限單元的方向朝右。

（3）將修改后的inp導(dǎo)入，建立job提交就可以了。

4.實(shí)例講解-鋼丸撞擊金屬板

本人在做機(jī)械噴丸的模擬，其中設(shè)置金屬板邊界部分為無(wú)限單元：

（1）建立CAE,將金屬板的邊界partition切割，全部設(shè)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(hào)單元節(jié)點(diǎn)的編號(hào)

在inp的datalines中第一列是單元編號(hào)，后面的是節(jié)點(diǎn)編號(hào)，在本文中，無(wú)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(diǎn)編號(hào)），showelementlabels（顯示單元編號(hào)），在mesh模塊中可以看到各個(gè)單元的編

號(hào)和節(jié)點(diǎn)的編號(hào)，隨意找一個(gè)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(diǎn)編號(hào)依次如上圖所示，在此，無(wú)限單元的方向是朝右,

inp修改的內(nèi)容如下圖。

C3D8

CIN3D8

而inp中的編號(hào)排列是750,710,114,113,621,158,12,9,141,所以須要進(jìn)行修改,

將12,158,710,114（逆時(shí)針排列）四個(gè)節(jié)點(diǎn)編號(hào)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(duì)于大范圍節(jié)點(diǎn)編號(hào)依次的修改，建議

接受UltraEdit軟件，列-列模式進(jìn)行批量修改。

（3）導(dǎo)入inp文件，建立job提交就可以了。

，留意事項(xiàng)：在interaction和load模塊中，定義面的時(shí)候不要將無(wú)限單元定義在里面，因?yàn)?/p>

在修改單元編號(hào)時(shí)，也把面重新定義了，在提交inp文件時(shí)出現(xiàn)錯(cuò)誤abaqus:ErrorinjobJ

ob-6:THEFACES6ISNOTVALIDFORTHEUNDERLYINGELEMENT56INSTANCEPART-5-1,

即某個(gè)面包含了無(wú)限單元，導(dǎo)致不能運(yùn)算。

修改好的無(wú)限單元為:

運(yùn)算后

修改前

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