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Sandwich face sheet wrinkling and its amplification caused by compression

From the PowerPoint presentation of the 1997 sandwich paper.

Shown here is the effect of initial face sheet waviness amplitude, w0: Under axial compression the amplification of w0 gives rise to the possibility of core crushing, core tensile failure, face sheet pull-off, core shear failure, and additional bending stresses in a face sheet as the initial face sheet waviness w0 is amplified by the compressive loading in a face sheet.

L=the critical buckling (wrinkling) half-wave length. Typical initial wrinkling amplitude, w0, is given by w0/L=0.001 (Plantema). This initial waviness is amplified by axial compression.

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