Kagome点阵结构参数对其压缩特性的影响及轻质化设计

Influence of Kagome lattice structure parameters on its compression characteristics and lightweight design

为研究三杆支撑(Kagome)结构的压缩性能并对其进行轻质化设计,通过改变胞元的结构参数,建立了12种不同胞元相对密度的Kagome多层点阵结构模型,利用压缩试验和模拟仿真对其进行准静态压缩力学性能分析。研究发现在胞元高度一定时,支撑杆倾角和截面直径的增大均会提高Kagome多层点阵结构的抗压缩性能,且倾角大小对结构整体最大等效平压强度的影响要大于杆直径的影响。胞元相对密度从16.6%提高到60.7%,整体等效平压模量提高了5.54倍,最大等效平压强度提高了4.52倍,模拟仿真结果和试验结果具有一致性。此外,对Kagome加固点阵结构进行轻质化设计,整体质量直接减少了16.3%,压缩仿真结果表明,轻质化设计小幅提升了点阵结构在压缩坍塌失效之前的整体等效平压模量、最大等效平压强度、相对比强度、比刚度和等参数。

In order to study the compressive properties of the three-rod support(Kagome)structure and carry out lightweight design,the Kagome multilayer dot matrix structure with 12 different relative cell densities was mod-eled by changing the structural parameters of the cell elements,and the quasi-static compressive mechanical prop-erties were analyzed using compression experiments and simulations.It is concluded that at a certain cell height,the increase of the inclination angle and cross-sectional diameter of the support rod will improve the anti-compression performance of the Kagome multilayer lattice structure,and the influence of the inclination angle on the overall max-imum equivalent flat compressive strength of the structure is greater than that of the rod diameter.The relative densi-ty of Kagome increased from 16.6%to 60.7%,the overall equivalent flat compressive modulus increased by 5.54 times,and the maximum equivalent flat compressive strength increased by 4.52 times,and the simulated and exper-imental results were consistent.In addition,the lightweight design of the Kagome reinforced point structure showed that the overall weight reduced by 16.3%.The compression simulation results showed the lightweight design slightly improved the overall equivalent flat compressive modulus,maximum equivalent flat compressive strength,relative specific strength,specific stiffness and other parameters of the point structure before the compression collapse failure.