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An Additional Matrix "Constraint Jacobian" In Shell Module

Posted 2025年4月24日 GMT+8 01:40 Studies & Solvers, Structural Mechanics, Physics Interfaces Version 5.5 1 Reply

JC Luo
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Hi,

Recently, when I checked the process of "Elimination Constraint Handing" in Shell Module, I found something confused.

As a toy model, I just built a plate in the Shell Module and no boundary conditions are applied. However, in the matrix "Constraint Jacobian", an additional constraint was used, i.e. . What's the meaning for this constraint?

In my knowledge, it implies the displacement component u_3 should be equal to 0 for all nodes. Actually, the surface plot in "Results" tells me this is misunderstanding.

Any guidance would be very appreciated. Thanks!

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1 Reply Last Post 2025年4月24日 GMT+8 02:05
JC Luo
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Posted: 6 months ago 2025年4月24日 GMT+8 02:05

Sorry , I think I find it, the constraint means instead. That implies the displacement of shell normal should be 0 as Reissner-Mindlin assumption required. Thanks.

Sorry , I think I find it, the constraint means n_3 \cod \theta_3=0 instead. That implies the displacement of shell normal \theta_3 should be 0 as Reissner-Mindlin assumption required. Thanks.

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