The advent and improvement of Additive Manufacturing technologies enable the fabrication of sandwich panels with complex shapes characterized by strength-to-weight ratio properties and multifunctional features. Due to the insufficient support performance for the overhanging panel, effective solutions need to be addressed for designing the internal filling cores. In this work, Triply Periodic Minimal Surfaces (TPMS) lattice of sandwich structures with novel linear, quadratic, and cosine gradient in cell size were designed and fabricated by selective laser melting (SLM) using Ti-6Al-4 V, and their morphology and mechanical properties of the sandwich structures were investigated using SEM, white-light interferometer, Micro-CT, compression experiment, and numerical simulation. The experimental results show that the manufacturing fidelity of the sandwich panel was improved due to the good overhanging support of cell-size graded lattices. Moreover, the plateau stress and cumulative energy absorption of quadratic graded lattices were enhanced by 57% compared to the uniform counterparts, attributing to the critical layer-by-layer collapse mechanism.

增材制造技术的出现和改进使制造具有复杂形状的夹心板成为可能，这些夹心板具有强度重量比特性和多功能特性。由于悬垂面板的支撑性能不足，需要在设计内部填充芯时提出有效的解决方案。在这项工作中，使用 Ti-6Al-4 V 通过选择性激光熔化 (SLM) 设计和制造了具有新型线性、二次和余弦梯度单元尺寸的夹层结构的三重周期最小表面 (TPMS) 晶格，以及它们的形貌和使用SEM、白光干涉仪、Micro-CT、压缩实验和数值模拟研究了夹层结构的机械性能。实验结果表明，由于单元尺寸渐变晶格的良好悬垂支撑，夹芯板的制造保真度得到提高。此外，与均匀对应物相比，二次梯度晶格的平台应力和累积能量吸收提高了 57%，这归因于临界的逐层坍塌机制。