Non-linear properties of metallic cellular materials with a negative Poisson's ratio

摘要: Negative Poisson's ratio copper foam was prepared and characterized experimentally. The transformation into re-entrant accomplished by applying sequential permanent compressions above the yield point to achieve a triaxial compression. of depended on strain attained relative minimum at strains near zero. as small -0.8 achieved. dependence properties occurred over narrower range than in polymer foams studied earlier. Annealing resulted slightly greater magnitude negative toughness expense decrease Young's modulus.