| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 84 === Auxetic foam is a new material which exhibits a negative
Poisson's Ratio. It gets fatter when stretched and thinner when
compressed. This novel propertyresults 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 convex shape
to re-entrantshape. The Poisson's ratio is such a fundamentally
important property of a material that a negative Poisson's
ratio will significantly affect the material's mechanical
performance. A method of fabricating rigid auxetic foamswas
developed. The microstructures, material properties, and
deformation underloading of conventional foam and auxetic foam
were compared by experiments. It was shown that auxetic foams
have higher ultimate strength and energy absorption.
Therefore, auxetic foams will be nice core materials which can
enhance the impact resistance of sandwich plate.
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