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Caculate the boundary force through surface integration of von mises stress

Posted Feb 18, 2014, 7:55 p.m. EST Structural Mechanics Version 4.3b 4 Replies

Wenqi Deng
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Hello everyone , just wanna ask a simple question.

The simulation is performed under structual mechanics.

Geometry is a cone, whose top redius is 0.009um, bottom radius is 5um, height is 9um. Material is silicon.

I applied a boundary load of 1e-6N total force (z direction only) on the top of the cone, and a fixed constraint on the bottom.

I run a stationery study. What I expected is that when I do the surface integration of von mises stress, the calculated force should be more or less 1e-6N, but what I get is 5.8e-9N.

Could anyone tell me what the problem is, please? Thanks a lot.
4 Replies Last Post Feb 20, 2014, 11:35 a.m. EST
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Feb 19, 2014, 8:44 a.m. EST
You should do the surface integration of the stress component normal to the surface, not the Mises stress.

Nagi Elabbasi
Veryst Engineering
You should do the surface integration of the stress component normal to the surface, not the Mises stress. Nagi Elabbasi Veryst Engineering
Wenqi Deng
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Posted: 1 decade ago Feb 20, 2014, 10:51 a.m. EST
Thanks Nagi

Could you tell me if there is other way to calculate the force?
Thanks Nagi Could you tell me if there is other way to calculate the force?
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Feb 20, 2014, 11:31 a.m. EST
Since you apply the load in the Z-direction and I assume you apply it on a surface in the X-Y plane, you should integrate the Z component of the stress tensor.
Since you apply the load in the Z-direction and I assume you apply it on a surface in the X-Y plane, you should integrate the Z component of the stress tensor.
Wenqi Deng
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Posted: 1 decade ago Feb 20, 2014, 11:35 a.m. EST
I get it. Thanks a lot.
I get it. Thanks a lot.

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