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What are the major failure modes of sandwich structures?

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Fill out the form and we will return to you asap. Thanks!

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info@managingcomposites.com
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whereismyhelmet
@managingcomposites.com

What are the major failure modes of sandwich structures? What are the causes of each failure mode?

1) Facing Failure – Caused due to insufficient panel thickness, facing thickness, or facing strength;

2) Transverse Shear Failure – Caused when either the shear strength of the core or panel thickness is insufficient;

3) Core Local Crushing – Caused when compressive strength of the core material is too low;

4) Panel Buckling – Caused when either the panel thickness of core shear stiffness is too low;

5) Shear Crimping – Caused when either the shear modulus of the core materials or the shear strength of the adhesive is too low;

6) Face Wrinkling – May occur depending on the relative strength of the core in compression and adhesive in flatwise tension;

7) Intracell buckling – Occurs where the skins or faces are very thin and the cell size is large. This effect may cause failure by propagating across adjacent cells, thereby inducing face wrinkling.

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Bibliographical Reference:

Advanced Composite Materials for Aerospace Engineering – Processing, Properties and Applications, Page 169.