泡沫填充负泊松比复合结构的吸能特性研究

Study of Energy Absorption Characteristics of Foam-filled Negative Poisson's Ratio Composite Structures

为研究硬质聚氨酯泡沫(RPUF)作为填充材料对负泊松比(NPR)结构吸能特性的影响。将不同比例的聚氨酯白料与聚氨酯黑料混合获得了三种类型的RPUF材料,通过试验计算了泡沫材料的压缩强度。将RPUF作为内凹型NPR结构的填充芯材制备了聚氨酯泡沫-负泊松比复合吸能结构(RPUF-NPR),分析了结构压溃变形的失效模式、泡沫力学性能变化对填充复合结构(RPUF-NPR)耐撞吸能特性的影响。结果表明:采用RPUF作为NPR结构的芯材,大幅提高了结构的承载能力和吸能特性指标,RPUF(30∶50)-NPR的平均压溃荷载值比纯RPUF-NPR提高了75.76%,总吸能值达到127.60 J。该研究工作证实填充RPUF可以有效提高NPR结构的抗压性能,也为RPUF-NPR在车辆被动安全防护领域中的应用提供了新思路。

To study the effect of rigid polyurethane foam(RPUF)as filler on the energy absorption characteristics of negative Poisson's ratio(NPR)structures.Three kinds of RPUF materials were obtained by mixing different proportion of polyurethane white material with black material,and the compressive strength of foam material was calculated by experiment.The polyurethane foam-negative Poisson's ratio composite energy absorption structure(RPUF-NPR)was prepared by using RPUF as the filling core material of the concave NPR structure.The failure mode of the structure's crushing deformation and the influence of the foam mechanical properties on the crashworthiness and energy-absorbing properties of RPUF-NPR were analyzed.The results show that using RPUF as the core material of NPR structure can greatly improve the carrying capacity and energy absorption characteristics of the structure.The average crushing load value of RPUF(30∶50)-NPR is 75.76%higher than that of pure RPUF-NPR,and the total energy absorption value reaches 127.60 J.This work confirms that filling RPUF can effectively improve the compression resistance of NPR structure,and provides a new idea for the application of RPUF-NPR in the field of passive vehicle safety protection.