通孔球壳胞元结构压缩力学性能

Compressive Mechanical Properties of Through-hole Spherical Shell Cell Structures

球壳胞元结构作为一种新型轻质功能材料,在航空航天、交通运输等领域有着广阔的应用前景。本工作通过实验和数值模拟的方法对简单堆积的通孔球壳胞元结构受压缩时的力学性能进行了研究,得出其名义应力-应变曲线,分析了结构的有效弹性模量、屈服极限、平台应力、比吸能等性能随球壳壁厚和球心距变化的规律。结果表明,部分球壳胞元结构在压缩过程中出现屈曲现象,并翻转形成塑性铰,从而增强结构的承载能力。球壳胞元结构的有效弹性模量、屈服极限随着球心距增大呈先增加后减小的规律,其平台应力和比吸能随着球心距增大而增加。综合各项数据可得,球壳胞元结构的球心距大于等于18.0 mm是更理想的结构形式。

As a new kind of multi-functional lightweight material,spherical shell cell structure has a great application prospect in aerospace,transportation and other fields.In this work,the mechanical properties of simple cubic through-hole spherical shell cell structure under compression were studied by means of experiment and numerical simulation.The nominal stress-strain curves were obtained,and the rules of effective elastic modulus,yield limit,platform stress,specific energy absorption and other properties with the change of shell wall thickness and spherical center distance was studied.The results showed that some spherical shell cell structures appeared buckling and turn over to form plastic hinges during the compression process,thus enhancing the bearing capacity of the structure.The effective elastic modulus and yield limit of the spherical shell cell structure increased first and then decreased with the increase of the spherical center distance,and the platform stress and specific energy absorption increased with the increase of the spherical center distance.It can be concluded that the spherical center distance greater than or equal to 18.0 mm is a more ideal structure.