如何在hm中加载随着距离变化的力。。

suliangyao

各位大侠，小弟在用hm分析中，用到在点上加载一个力，它是随着距离变化的力，F=30s，s就是位移（0<s<10），F是力。
请各位大侠不吝指教。。

Eospearo

位移是可控的吗？
如果可以，那么请控制速度，从而位移确定，力就施加一条根据位移算出来的曲线！

jinleki

ls说的不错，你可以搞一条时间-力曲线来控制。其他方法怎么想都是只能在多体动力学软件中实现。

suliangyao

的确可以转换成力和时间的关系图，
小弟不知道怎么加载，我在FORCE面板里面没有找到相应的加载方法。
请各位大侠具体指教一下，小弟不胜感激。。。

Eospearo

建一条load curve,然后施加在需要的位置！

suliangyao

5# Eospearo

Eospearo 你好，谢谢你的指教。。
具体是怎么建立load curve,我在hm中找过，好像没有这个命令。
是不是在force 面板下magnitude选项里面？

Eospearo

6# suliangyao

Extract the follow information from the help documents.

*DEFINE_CURVE
The *DEFINE_CURVE card defines a curve in LS-DYNA. Curves are often used to define non-linear materials and loads. There are a few methods for creating DYNA curves in LS-DYNA in HyperMesh. A few methods are described below.
Method 1: Create using the Curve Editor
From the XYPlots menu, click Curve Editor.
Method 2: Input XY Data from a File
Create *DEFINE_CURVE by inputting an XY data file from the read curves or edit curves panel in the xy plots drop down menu. The figure below displays a sample XY data file with a format supported by these panels.
Method 3: Create with Math Expressions
Create *DEFINE_CURVE with math expressions from the edit curves panel. From this panel, you can also create *DEFINE_CURVE with a math expression and an XY data file combination.

suting2008

6# suliangyao
如图所示：