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Posted 8 juin 2011, 17:49 UTC−4 2 Replies

Mandy Lai
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Hi, I am trying to model the stick-slip phenomena in the fingerprints. I have a number of "ridges" connected to each other and I want to apply a prescribed displacement to a point on the ridge, with a force input. I know a solution is to use a "stiff-spring" constraint (sort of like an elastic support), where a force input will cause a prescribed displacement on the ridge.

Any idea of how to model a prescribed displacement with a force input?

Thank you
Mandy
2 Replies Last Post 9 juin 2011, 09:21 UTC−4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 9 juin 2011, 04:04 UTC−4
Hi

I do not believe the prescribed displacement is the one to use, as this enforces a fixed "u" and a spring force is rather a F = -k*u,

So I would propose to use a boundary load of the type F = -Ks*u (or v w or whatever correct combination)

These load cases are added as explicit BCs in V4.2

--
Good luck
Ivar
Hi I do not believe the prescribed displacement is the one to use, as this enforces a fixed "u" and a spring force is rather a F = -k*u, So I would propose to use a boundary load of the type F = -Ks*u (or v w or whatever correct combination) These load cases are added as explicit BCs in V4.2 -- Good luck Ivar
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 9 juin 2011, 09:21 UTC−4
Why do you want to apply a prescribed displacement using force input? Why not just apply the displacement directly?

Nagi Elabbasi
Veryst Engineering
Why do you want to apply a prescribed displacement using force input? Why not just apply the displacement directly? Nagi Elabbasi Veryst Engineering

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