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blogTitle:'ABAQUS有限元接触分析的基本概念',
blogAbstract:'16.1.1& 点对面离散与面对面离散
【常见问题16-1】
&&& 在ABAQUS/Standard分析中定义接触时，可以选择点对面离散方法(node-to-surface-dis- cre-tization)和面对面离散方法(surface-to-surface discretization)，二者有何差别?
&&& 在点对面离散方法中，从面(slave surface)上的每个节点与该节点在主面(master surface)上的投影点建立接触关系，每个接触条件都包含一个从面节点和它的投影点附近的一组主面节点。
&&& 使用点对面离散方法时，从面节点不会穿透(penetrate)主面，但是主面节点可以穿透从面。',
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abaqus关键字的中文说明摘要.doc 24页
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(一)总规则
1、关键词必须以*符号开头，且关键词前无空格；
2、**为解释行，它可以出现在文件中的任何地方；
2、当关键词后带有参数时，关键词后必须采用逗号相隔；
3、参数间采用都好相隔；
4、关键词可以采用简写的方式，只要程序能够识别就可以了；
5、没有隔行符，如果参数比较多，一行放不下，可以另起一行，只要在上?????一行的末尾加逗号便可以；
(二)建模部分关键词????在我的学习过程中，是将ansys的模型倒入abaqus的，最简单的方法就是在ansys中提取单元与节点信息，将提取出来的信息在abaqus中形成有限元模型。因此首先从节点的关键词来开始吧。
1、*heading???描述行
这是.inp文件的开头语，相当于你告诉abaqus，我要进行工程建模与分析了。另起一行可以对模型进行描述，这个描述可有可无，只是为了以后阅读的方便。abaqus中对每个模块没有清晰的界定，根据关键词的不同来判别进入哪个模块。而在ansys中对模块要求比较严格，如/prep7为前处理模块，/solu为求解模块,/post26为后处理模块。
2、*node,&input&,&nset=结点集名称&,&system&
(a) 通知软件，我要开始建立结点了。&&的意思是&&中的内容可有可无，这两个也称为node 命令的参数。
(b) &input&: 指出包含结点所在的文件名称，包括文件的扩展名。当这项参数省略时，程序认为*node下的数据为所需要建立的结点。
(c) &nset=结点集名称&: 熟悉ansys的人应该了解，为了选择的方便对某些合适的点可以采用cm命令建立component(cm,结点集名称,node)，在abaqus中&nset=结点集名称&与此相对应。
(d) &system&: 坐标系标识参数，system=r（缺省）定义坐标系为笛卡尔坐标系，system=c定义坐标系为柱面坐标系，system=s定义坐标系为球面坐标系。这个坐标系为局部坐标系.
3、*element,type=单元类型,&elset=&,&input&
??(a) 建立单元关键词；这一命令将单元类型，单元特性，单元结点以及单元集这几个过程全部统一起来。
??(b) *element与type=单元类型必须同时使用，否则程序不知道你的单元是什么形状，哪种类型。在ansys中对模型划分网格，你需要做两步：指定单元类型（et），确定单元特性（keyopt）,然后建立单元;在abaqus中单元类型与单元特性通过单元的名称可以完全确定下来。
??(c) &elset=&这个参数来确定单元集的名称; ansys中需要采用（cm,,elem）来定义。
??(d) &input& 指出包含单元信息的文件名称,包括文件的扩展名。
4、*solid section,elset,material
??(a) 对实体单元、无限元以及truss单元的特性作出声明；
??(b) elset 指出单元集的名称；
??(c) material 指定此类单元对应的材料。
??(d) 此项命令类似于ansys中给几何体确定相应的属性，如vatt,latt等命令，不同的是ansys中一般对集合体确定单元、材料、实常数，而在abaqus中，材料通过*solid section命令赋予单元。
5、*nset,nset=,&elset&,&instance&,&internal&,&generate&,&unsorted&
??(a) 指定结点集以及结点集的名称，相当于ansys中的 cm,name,node。其中*nset于nset=是同时出现的，既然定义了结点集，就一定得给出结点集的名称；
??(b) &elset& 将前面定义的单元集中所有结点定义成结点集，注意此项不能与&generate&参数选项同时使用；
??(b) &instance&??(c) &internal& 确定结点集中的结点是内部确定的。缺省的设置是省略这项；
??(d) &generate& 此参数可以根据用户指定的参数自动确定结点集中的结点.如果使用了这个参数，那么在*nset的命令中需要按照一定的格式来确定并产生结点。如
??????*nset,nset=long,generate
??????n1,n2,i
正在加载中，请稍后...tied to_中华文本库
Slave node 12 instance plate-1-lin-2-1 will not be tied to the master surface assembly__pickedsurf93. The distance from the master surface is ...
Key to Exercises U1 I 1. 2. 3. 4. 5. 6. 7. 8. 9. tied with a ribbon for decoration did not have a favorable or friendly feeling toward ...
Detailed reading She lingered beside villages of boat folk, and saw them live, the babies tied to a rope and splashing in the shallower waters. But ...
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In a sense they were tied to the ground. Now they were able to ride on horseback. This gave them a freedom of movement, thus completely liberating ...
*Contact Tied Nodes To Surface *Contact_Tied_Nodes_To_Surface *Contact_Tied_Surface_To_Surface 接触类型(续) 2.采用罚函数算法、约束平动、不考虑失效、...
Unit 5 Lifelong Education Passage A Tongue-tied Several weeks ago I was ...He listened to the radio as he drove and often jotted down unfamiliar, ...
For me, happiness is closely tied to my studies, my work and my family. When I make great progress in my studies , when I made contributions to ...
2. Check XCLKS is connected to the correct logic level in order to select used oscillator circuitry. 3. Check the TEST pin is tied to GND. 4. ...
Cans or old shoes are sometimes tied to the car that carries the bride and groom away. Some people think that loud noises drive bad spirits away. ...查看: 8025|回复: 0
abaqus 计算出错。接触方面的。谁能帮我解决一下吗？谢谢。
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学徒工, 积分 543, 距离下一级还需 -443 积分
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Node 258 instance luoshuan_2-1 is common between the tied pair (asse
mbly__t3_luoshuan_2-1_s, assembly__t3_luoshuan_2-1_m). No constraint is formed for this node.
Node 259 instance luoshuan_2-1 is common between the tied pair (assembly__t3_luoshuan_2-1_s, assembly__t3_luoshuan_2-1_m). No constraint is formed for this node.
Node 260 instance luoshuan_2-1 is common between the tied pair (assembly__t3_luoshuan_2-1_s, assembly__t3_luoshuan_2-1_m). No constraint is formed for this node.
Node 261 instance luoshuan_2-1 is common between the tied pair (assembly__t3_luoshuan_2-1_s, assembly__t3_luoshuan_2-1_m). No constraint is formed for this node.
Node 262 instance luoshuan_2-1 is common between the tied pair (assembly__t3_luoshuan_2-1_s, assembly__t3_luoshuan_2-1_m). No constraint is formed for this node.
Node 263 instance luoshuan_2-1 is common between the tied pair (assembly__t3_luoshuan_2-1_s, assembly__t3_luoshuan_2-1_m). No constraint is formed for this node.
For contact pair (assembly_surf-bolt_1-up-assembly_surf-plate-up), adjusted nodes with very small adjustments were not printed. Specify *preprint,contact=yes for complete printout.
For contact pair (assembly_surf-bolt_2-up-assembly_surf-plate-up), adjusted nodes with very small adjustments were not printed. Specify *preprint,contact=yes for complete printout.
Not all the nodes that do not find intersection with the master surface are printed. However all of these nodes have been included in a node set.
For contact pair (assembly_surf-plate-down-assembly_surf-part-up), adjusted nodes with very small adjustments were not printed. Specify *preprint,contact=yes for complete printout.
For *tie pair (assembly__t0_luoshuan-1_s-assembly__t0_luoshuan-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly__t1_luoshuan-1_s-assembly__t1_luoshuan-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly__t2_luoshuan-1_s-assembly__t2_luoshuan-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly__t3_luoshuan-1_s-assembly__t3_luoshuan-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly__t0_luoshuan_2-1_s-assembly__t0_luoshuan_2-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly__t1_luoshuan_2-1_s-assembly__t1_luoshuan_2-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly__t2_luoshuan_2-1_s-assembly__t2_luoshuan_2-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly__t3_luoshuan_2-1_s-assembly__t3_luoshuan_2-1_m), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly_surf-bolt_1-cir-assembly_surf-part_1-cir), not all the nodes that have been adjusted were printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly_surf-bolt_2-cir-assembly_surf-part_2-cir), not all the nodes that have been adjusted were printed. Specify *preprint,model=yes for complete printout.
Slave node 13 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 15 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 19 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 26 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 121 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 122 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 123 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 124 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
Slave node 125 instance luoshuan-1 will not be tied to the master surface assembly_surf-part_1-cir. The distance from the master surface is greater than the position tolerance value.
abaqus 计算出错。接触方面的。谁能帮我解决一下吗？谢谢。
在创建 装配的时候是不是 接触的面都要&&约束住啊？
望大家不吝赐教！
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这个你先看看帮助文件中关于接触的实际情况，即接触的定义，具体就应该是两个面上节点与节点的约束，但是如果你的网格划分的不合适，两个面上的节点无法匹配的话，就会出现你说的那个问题，建议多划分几次网格试试
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