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Densification and crushing of a thin elastic material?

Densification and crushing of a thin elastic material?

Densification and crushing of a thin elastic material?

(OP)
Hello all,

Please could you help shed some light on this issue that I can't figure out. :)

A thin sheet of soft uniform material is lying flat on a rigid surface, and is subjected to transverse compression (ramp increasing force) by a flat indenter from the top.

In real life, past a certain point the material is densified and becomes crushed, such that it deflects less and less per equal unit of increased compression force (i.e. it becomes stiffer).

In a finite-element model, this sheet is represented by a simple linear elastic material formulation. Is this stiffening behaviour intrinsically taken into account by the fact that the elements are densifying beneath the indenter? Or, is a linear elastic material model not sufficient to capture this behaviour?

Thank you

RE: Densification and crushing of a thin elastic material?

Linear elastic means just that. The load-deflection relationship is linear (i.e. constant stiffness). So no, a liner elastic model cannot capture the nonlinear behavior you are describing.

Brian
www.espcomposites.com

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