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发表于 2009-3-15 12:25:57
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来自 江苏南京
发了个帖子 也没人回答 只能自己搜索了 我把大家的观点我认为正确的给摘录了下来 大家一起学习
Discrete rigid parts
A part that you declared to be a discrete rigid part can be any arbitrary three-dimensional, two-dimensional, or axisymmetric shape. Therefore, you can use all the Part module feature tools—solids, shells, wires, cuts, and blends—to create a discrete rigid part. However, only discrete rigid parts containing shells and wires can be meshed with rigid elements in the Mesh module. If you try to create an instance of a solid discrete rigid part in the Assembly module, Abaqus/CAE displays an error message; you must return to the Part module and convert the faces of the solid to shells.) H4 h. |) k% q, V2 _
Analytical rigid parts1 O! v1 o2 _8 N9 E1 Z
An analytical rigid part is similar to a discrete rigid part in that it is used to represent a rigid part in a contact analysis. If possible, you should use an analytical rigid part when describing a rigid part because it is computationally less expensive than a discrete rigid part. The shape of an analytical rigid part is not arbitrary, and the profile must be smooth.
解析刚体其实就是用几何的形状表示刚体;
而离散刚体则是用离散的单元来表示刚体
模具也可以设成变形体,然后在interaction模块里面设定congstraint形式为刚体,并设定参考
点,就可以将变形体属性变为刚体,注意的问题就是要在property模块里面创建section并assign
section
如果是动力学问题,涉及到旋转,需要把参考点设置为刚体的质心,其他情况参考点位置任意。
首先都是刚体,解析刚体主要是由直线圆弧等具有简单几何关系的曲线构成,易于建模,离散刚
体主要用于形状复杂的几何体,无法用简单线条构成,比如一些复杂模型的导入,二者本质上没
有区别。但离散刚体需要划分网格,解析刚体不用划分网格。
解析刚体不用赋予截面属性,只要直接给参考点赋予质量就可以了。
对于形状简单的刚性部件,使用解析刚体可以精确的模拟部件的几何形状,而且可以减少计算代
价;但是如果刚性部件的几何形状比较复杂,就需要使用离散刚体
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