一种正、负和零泊松比相互转换的新策略

New strategy for interconversion of positive,negative,and zero Poisson’s ratios

针对正、负和零泊松比值难以调节的问题,本文基于曲杆/板组成的内凹式十边形多孔结构,提出了一种转换策略。采用数值模拟和实验相结合的方法验证了在不同胞壁曲率下,结构的泊松比不同(范围包括正、负和零)。研究发现:结构的泊松比绝对值随着有效真实应变的增大而逐渐减小,随后出现了相反的泊松比值。对这种现象进行了分析,并提出了曲率效应影响机制。

To address the problem that the positive,negative and zero Poisson′s ratios are difficult to adjust,a new conversion strategy is proposed based on re-entrant decagonal cellular structures composed of curved rods/plates.A combination of experiments and numerical simulations are performed to verify that the Poisson′s ratios of the structures are different(the range includes positive,negative,and zero)under various rod curvatures.The absolute value of the Poisson′s ratios of such structure is found to decrease gradually with the increasing effective true strain,followed by the appearance of reversed Poisson′s ratios.Theoretical analysis is conducted to explain such phenomena,and a curvature effect is proposed.