NONLINEAR PROPERTIES OF METALLIC CELLULAR MATERIALS WITH A NEGATIVE POISSON RATIO
NONLINEAR PROPERTIES OF METALLIC CELLULAR MATERIALS WITH A NEGATIVE POISSON RATIO
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DOI：
10.1007/bf02403846
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发表时间：
1992-10-01
影响因子：
4.5
通讯作者：
LAKES, RS
中科院分区：
文献类型：
--
作者：
CHOI, JB;LAKES, RS
制备了负泊松比泡沫铜材料，并对其进行了实验表征。通过在屈服点以上施加连续的永久压缩以实现三轴压缩，来完成向凹进泡沫的转化。凹腔泡沫的泊松比依赖于应变，并在应变接近零时达到相对最小值。泊松比小至-0.8。的应变依赖性的性能发生在一个较窄的范围内的应变比早期研究的聚合物泡沫。退火的泡沫导致在一个稍大幅度的负泊松比和更大的韧性在杨氏模量的降低为代价。
Negative Poisson's ratio copper foam was prepared and characterized experimentally. The transformation into re-entrant foam was accomplished by applying sequential permanent compressions above the yield point to achieve a triaxial compression. The Poisson's ratio of the re-entrant foam depended on strain and attained a relative minimum at strains near zero. Poisson's ratio as small as - 0.8 was achieved. The strain dependence of properties occurred over a narrower range of strain than in the polymer foams studied earlier. Annealing of the foam resulted in a slightly greater magnitude of negative Poisson's ratio and greater toughness at the expense of a decrease in the Young's modulus.