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ABSTRACT
Auxetic foam is a new material that exhibits a negative Poisson'
s ratio. It gets fatter when stretched and thinner when
compressed. This property results from its re-entrant
cell shape. Auxetic foam has been fabricated by heating
and compressing to force the cell rib into
permanent buckle and deformation, and then the cells were
converted from converx shape to re-entrant shape. The
Poisson's ratio is such a important property of a
material that a negative Poisson's ratio will
significantly affect the material's mechanical performance .
The new material here is the core of composite sandwich
plates, and a finite element method is developed to
analysis the dynamic performance of the plates with low
velocity impacted.
We will discuss the difference of contact force, displacement,
and strain between composite sandwich plates with auxetic
foam and usual foam .
The method we developed is using finite element method to
model the face plate that based on the Mindlin's plate
theory and lamination theory. A nine-node isoparametric
element is employed in the finite element programming.
The displacement fields of the sandwich core are
linearly interpolated in terms of the displacements of two face
plates
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