zhuxiaorui,

Just now i sent one mail with regard with your question. I made one
mistake because of uncarefulness.I still think you model doesnot have
enough constraint. If you build 2D model with shell63, you must be
careful to be the applied force direction. Otherwise, Ansys will think
you just constraint one line not one surface. so your problem will come
out. there are two ways to solve your problem

1. 3D model with solid element, constraint one end surface.

2. 2D model with shell element careful with force direction.

In fact, i just try the above.they works.

Good luck

shifeng Li

>From: "zhuxiaorui" >To: [email protected] >Subject: about ansys
>Date: Fri, 14 Dec 2001 14:52:23 +0800 > >Dear Li > >Thanks for your
information in MEMS-talk. However I still have some detail problems to
query. > >I take advantage of the element "Shell63". I constrain all the
DOF of one side of it. I use polysilicon as the material. When I add a
pressure on its bottom surface, the kind of error I mentioned appears.
But I think the constraint and the material property are both correct. >
>I will appreciate if you give me any advice. > >Best regards, > >Zhu
Xiaorui > > zhuxiaorui > [email protected] >

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