Composite lattice cores sandwich structures have shown obvious advantages in specific mechanical property and potential multifunctional integration. 3D-Kagome lattice core is regarded as a classic core configuration with relative optimal theoretical performance. However, it is still unavailable due to preparation problem of the overlap joint-node of composite cores. In this paper, a self-locking mortise-tenon joint method is presented to sucessfully fabricate the integrated 3D-Kagome cores with the expected mechanical properties. The out-of-plane compressive behaviour and energy absorption characteristics are experimentally studied. For the composite structures with various relative densities, three kinds of compressive curves are observed, following by different failure modes. An obvious bearing reinforcement emerges for the lattice cores with high relative density. As the length-to-thickness ratio of the core-rods increases, the initial peak strength and modulus of structures both decrease with a slowing rate. Though the mortises weaken the load-bearing capacity of core-rods, the active constraint of mortise-tenon joint suppresses an obvious degradation. The dominated failure more depends on the core-height than rod-thickness. The composite 3D-Kagome cores show more excellent mechanical properties than other similar structures, especially for the elastic strain before the initial peak stress. The semi-rigid power-wasting mortise-tenon joint and load-bearing characteristics of Kagome core together provide a large deformation tolerance at a relatively high stress level. All suggest that the presented 3D-Kagome lattice cores could be considered as a potential energy absorbing material.

复合晶格芯夹层结构在特定的力学性能和潜在的多功能集成方面表现出明显的优势。3D-Kagome晶格核心被认为是具有相对最佳理论性能的经典核心配置。然而，由于复合芯重叠接头节点的制备问题，它仍然不可用。在本文中，提出了一种自锁榫卯连接方法，以成功制造具有预期机械性能的集成 3D-Kagome 芯。实验研究了面外压缩行为和能量吸收特性。对于不同相对密度的复合结构，观察到三种压缩曲线，其破坏模式不同。对于相对密度高的晶格芯，出现了明显的轴承增强作用。随着芯棒长厚比的增加，结构的初始峰值强度和模量均以减慢的速度下降。虽然榫眼削弱了芯杆的承载能力，但榫卯接头的主动约束抑制了明显的退化。主导失效更多地取决于核心高度而不是杆厚。复合 3D-Kagome 磁芯显示出比其他类似结构更优异的机械性能，尤其是在初始峰值应力之前的弹性应变方面。Kagome 核心的半刚性耗能榫卯连接和承重特性共同提供了在相对较高应力水平下的大变形容限。