如何输出节点作用力RF? (how to export the nodal forces on some indicated nodes?)

liumao1981

帮朋友问个问题,以下是他的问题,请帮忙解答一下,中英文均可,谢谢!
Hi  there,
I am currently modelling rolling by using ANSYS LS-DYNA, and now in the step of doing time history Post pro.
I want to get the reaction forces on some indicated nodes. The problem is the results appear INVALID. Can anyone please help me what is wrong in here and how to fix it. In case you know a better method to get such forces on the nodes, would you please give me some instructions?
Any help would be appreciated.
Many thanks

长脚

你可以参考我对这个帖子的回复http://forum.simwe.com/thread-1020248-1-1.html

liumao1981

Hi 长脚. Thanks for your response.
I already checked the link suggested. But its not useful.
I wanna export the ncforce just for some indicated nodes, not for all the nodes. Once the DATABASE_HISTORY_NODE is used, the data output are written to the nodout file and are not included the nodal force.

Do you have any idea?

长脚

不能光看，你去试下

liumao1981

Hi 长脚,

I already tried, and also read the k word manual very carefully. The data in the Nodout file include such data: displacement, velocity, acceleration, rotation, rotational velocity and rotational acceleration. Nodal force data are not included in this file.

Thanks  

20020824

liumao1981 发表于 2012-1-12 11:43
Hi 长脚,

I already tried, and also read the k word manual very carefully. The data in the Nodout f ...

louzhu's english is quite OK, I gan bai xia feng.
For your need, I think the results should be in the result file "NODFOR",neither "NCFORC" nor "NODOUT".
To get your wanted  "NODFOR",two keywords are related, *set-node and *database_nodal_force_group.

liumao1981

Hi 20020824,

I already found out the way to export the nodal forces yesterday, and intended to post the reply in case anyone met the same problem, but you are faster As mentioned above, database_nodal_force_group should be applied. ^^

Sorry for posting everything in English 'cause im not Chinese.

Thank you guys again.
Cheers