Learning Forum

[William Yu]

Hi guys,

I use beam element to simulte screw in ansys mechanical. The scope in reference and that in mobile I have selected are shown in figs below. However, the length of the generated beam element is shorter than the length of the screw shank. As you see in the second picture, the end of the beam element has not reached the end of the blue face, which should be the real end of the screw. could any one tell me why? Many thanks! 

 

[Aurojyoti Prusty]

Hi,

The vertex of the hole should be selected as contact side and the surface can be selected as target side if you doing an MPC connection (or follow for the same as per the fixed connection). You need to give the same definition to both ends of the screw(not one side). 

You may refer to the following link for more discussion on the same. 

Correct beam connection to simulate screw (ansys.com)

/forum/forums/topic/correct-beam-connection-to-simulate-screw/

You can also go through this video if you have access for the same.

/courses/index.php/courses/connecting-bolts-with-the-rest-of-an-assembly/lessons/connecting-bolts-represented-as-beam-elements-lesson-3/

Hope this helps,

Thanks

Aurojyoti

 

[William Yu]

Dear Aurojyoti,

Thank you very much for your reply. However, my situation is somewhat different from what's shown in the video. In my case, it's a screw, whereas the video deals with a bolt. The length of the bolt is longer than the combined thickness of two parts which are connected this bolt, so it can be set the same way on both sides. But for the screw in my case, only one end is outside the parts, so it seems I can't give the same definition to both ends of the screw. 

Best,

William

[William Yu]

By the way, I use beam connection method, not line-body to simulate screw.