显式动力模拟力加载的情况如何避免模型乱跑

as997788

最近需要做一个采用显示动力计算的问题，是对一块方形开孔板采用四边力加载，对边的力是平衡的，那么预想的情况是仅发生沿着四边的伸长，无旋转。但是计算出来的结果是板会乱跑并发生旋转。如图所示。请问有什么方法可以解决？原来用隐式算法时可以加接地的弹簧，显示不支持弹簧单元，有类似的解决方法吗？

as997788

顶一下。。。别沉了。。。有大佬遇到过类似的情况吗。。。。

yaodigenius

谁说explicit不能加弹簧  找个连接器加加加加：）

as997788

yaodigenius 发表于 2019-6-26 11:47
谁说explicit不能加弹簧  找个连接器加加加加：）

在属性的特殊设置里加了弹簧/阻尼器选项，提交的时候提示ELEMENT TYPE SPRING1 IS NOT AVAILABLE IN Abaqus/Explicit

ANGRY

as997788 发表于 2019-6-26 14:36
在属性的特殊设置里加了弹簧/阻尼器选项，提交的时候提示ELEMENT TYPE SPRING1 IS NOT AVAILABLE IN Abaq ...

其他原因吧

maschinen666

*SPRING
Define spring behavior.


This option is used to define the spring behavior for spring elements. It is also used to assign a structural damping factor to form the imaginary part of the spring stiffness matrix. The imaginary stiffness represents an element-level damping contribution to the frequency domain dynamic equations and to the time domain mode-based dynamic analyses that support nondiagonal damping (see “Modal dynamic analysis,”  Section 2.5.5 of the Abaqus Theory Guide).

In Abaqus/Standard analyses it is also used to define the spring behavior for ITS and JOINTC elements. If the *SPRING option is being used to define part of the behavior of ITS or JOINTC elements, it must be used in conjunction with the *ITS or *JOINT options and the ELSET and ORIENTATION parameters should not be used.

Products: Abaqus/Standard  Abaqus/Explicit  Abaqus/CAE

spring element 当然是可以用再显示计算的。你的设置有问题.

maschinen666

SPRING1 and SPRING2 elements are available only in Abaqus/Standard. SPRING1 is between a node and ground, acting in a fixed direction. SPRING2 is between two nodes, acting in a fixed direction.

The SPRINGA element is available in both Abaqus/Standard and Abaqus/Explicit. SPRINGA acts between two nodes, with its line of action being the line joining the two nodes, so that this line of action can rotate in large-displacement analysis

选择单元类型springa