新型边界增强变截面空心BCC点阵结构的耐撞性分析  

Crashworthiness Analysis of a Novel Variable-section Hollow BCC Lattice with Boundary Enhancement

作　　者：李博 刘华[1] 张显涛 罗敏[3] 杨先锋 LI Bo;LIU Hua;ZHANG Xiantao;LUO Min;YANG Xianfeng(School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China;Shenyang Aerospace Xinguang Group Co.,Ltd.,Shenyang 110043,China;Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]沈阳航天新光集团有限公司,沈阳110043 [3]北京空间飞行器总体设计部,北京100094

出　　处：《载人航天》2025年第2期202-211,共10页Manned Spaceflight

基　　金：国家自然科学基金项目(12002027)。

摘　　要：针对点阵结构在实际应用中所面临的边界条件和实际尺寸及阵列数限制的问题,提出了一种新型变截面空心点阵设计思路以提高结构的能量吸收能力。通过在变截面空心点阵边界处添加金属片单元,设计了新型增强型变截面空心点阵材料;基于选区激光熔融工艺制备了316L不锈钢变截面空心点阵和增强型变截面空心点阵结构;通过准静态压缩试验及基于LsDyna的仿真分析,对各变截面空心点阵结构的力学性能和吸能特性展开研究。基于试验验证的有限元模型进行了点阵结构性能参数化分析,揭示了边界金属片单元布置方式对增强型点阵结构的能量吸收影响规律。结果表明:金属片单元布置在垂直于加载平面的点阵棱边,可显著增强其能量吸收能力且具有良好的载荷均匀性。Targeting the problem of limitations in boundary conditions,sizes,and the number of arrays in practical applications of lattice structures,a novel design concept for variable cross-section hollow(VCH)lattice structures was proposed to enhance their energy absorption capabilities.By incorporating metal strips at the boundaries of the VCH lattices,a new type of reinforced variable cross-section hollow(RVCH)lattice material was designed.Both VCH lattices and RVCH lattice structures made of 316L stainless steel were fabricated using selective laser melting(SLM)technology.The mechanical properties and energy absorption characteristics of these VCH lattice structures were investigated through quasi-static compression tests and finite element simulations based on Ls-Dyna.A parametric analysis of the lattice structure performance was conducted using the validated finite element models to reveal the influence of the arrangement of metal strips on the energy absorption of the reinforced lattice structures.The results demonstrated that the arrangement of metal strips perpendicular to the loading direction at the lattice edges significantly enhanced the energy absorption capability and load uniformity of the reinforced lattice structures.

关 键 词：点阵结构 变截面设计 边界设计 数值模拟 能量吸收 

分 类 号：V45[一般工业技术—材料科学与工程]