Sandwich composite structures are comprised of a low-density core (commonly honeycomb) and facesheets. They are typically used in applications that require lightweight for efficient design, such as in the marine and aerospace industries. This work investigates the feasibility of adopting triply periodic minimal surface (TPMS) cellular structures as the core for sandwich composites. Sandwich structures were manufactured using a carbon fiber-reinforced polymer (CFRP) facesheet and three different 304 L stainless steel core structures (honeycomb, gyroid TPMS, and diamond TPMS). Three mechanical tests, namely edgewise compression, three-point bend, and impact test, were carried out to evaluate the performance of each sandwich configuration. The experimental results of the non-traditional sandwich configurations were compared against those of a honeycomb core sandwich composite. The edgewise compression test showed that the ultimate edgewise compressive strength increased by 7% when the honeycomb core was replaced by the gyroid core and reduced by 2% when the diamond core replaced the honeycomb core. The three-point bend test showed that the traditional honeycomb core sandwich configuration had a higher shear yield stress when compared to the non-traditional sandwich structures. The shear yield stress was reduced by 54% when non-traditional sandwich cores were used. The shear ultimate stress was reduced by 41% and 37% when the honeycomb core was replaced by the gyroid and diamond structure, respectively. Impact test results, on the other hand, showed that the peak force recorded during the impact event was reduced, while the absorbed energy was increased when non-traditional cores were used. Peak force was reduced by 28% and 39%, while the absorbed energy was increased by 9% and 16% when the honeycomb core was replaced by the gyroid and diamond cores, respectively.

夹心复合结构由低密度芯（通常为蜂窝）和面板组成。它们通常用于需要轻量化以实现高效设计的应用，例如海洋和航空航天工业。这项工作研究了采用三重周期性最小表面 (TPMS) 蜂窝结构作为夹心复合材料的核心的可行性。三明治结构是使用碳纤维增强聚合物 (CFRP) 面板和三种不同的 304 L 不锈钢芯结构（蜂窝、陀螺 TPMS 和金刚石 TPMS）制造的。进行了三项机械测试，即边缘压缩、三点弯曲和冲击测试，以评估每种夹层结构的性能。将非传统夹层结构的实验结果与蜂窝芯夹层复合材料的实验结果进行了比较。边向压缩试验表明，当蜂窝芯替换为陀螺芯时，极限边向压缩强度提高了7%，金刚石芯替换蜂窝芯时，边向压缩强度降低了2%。三点弯曲试验表明，与非传统夹层结构相比，传统的蜂窝芯夹层结构具有更高的剪切屈服应力。当使用非传统夹心芯时，剪切屈服应力降低了 54%。当蜂窝芯被螺旋结构和金刚石结构取代时，剪切极限应力分别降低了 41% 和 37%。另一方面，冲击试验结果，表明在撞击事件期间记录的峰值力降低，而当使用非传统核心时吸收的能量增加。当蜂窝芯被螺旋芯和金刚石芯取代时，峰值力分别降低了 28% 和 39%，而吸收能量分别增加了 9% 和 16%。