Triply periodic minimal surface (TPMS) sheet lattice structures are composed of continuous and smooth shells, enabling the achievement of a high surface-to-volume ratio and pore interconnectivity, which represent an emerging solution for lightweight applications. In this study, an improved Schwarz primitive lattice (P-lattice) structure was proposed by redefining the original opening diameter with a shape parameter. Prototypes of different configurations, such as the original P-lattice (OP) structure, modified P-lattice structure with a small opening diameter (SP), and modified P-lattice structure with a big opening diameter (BP) were fabricated via micro-selective laser melting using 316 L stainless steel. Quasi-static compression tests were performed on the fabricated samples. The experimental results indicated that the Young's modulus, compressive strength, and energy absorption of the SP lattice were increased by 25.84%, 15.63%, and 33.02%, respectively, compared with those of the OP structure. A finite element model was established to investigate the mechanical properties and energy absorption of all the designed configurations, and the results showed good agreement with the experimental observations. A rigid–plastic hardening model was also introduced to macroscopically predict the mechanical response and energy absorption of the as-designed lattice structures. The mechanical properties and energy absorption of the SP structure outperformed those of the OP and BP structures.

三重周期性最小表面 (TPMS) 片晶格结构由连续和光滑的壳组成，能够实现高表面积与体积比和孔隙互连，这是轻量级应用的新兴解决方案。在这项研究中，通过使用形状参数重新定义原始开口直径，提出了一种改进的 Schwarz 原始晶格（P-lattice）结构。不同配置的原型，如原始 P 晶格 (OP) 结构、具有小开口直径 (SP) 的改良 P 晶格结构和具有大开口直径 (BP) 的改良 P 晶格结构，通过微使用 316 L 不锈钢的选择性激光熔化。对制造的样品进行准静态压缩试验。实验结果表明，杨氏模量，与OP结构相比，SP晶格的抗压强度和能量吸收分别提高了25.84%、15.63%和33.02%。建立有限元模型来研究所有设计配置的机械性能和能量吸收，结果与实验观察结果吻合良好。还引入了刚性-塑性硬化模型来宏观预测设计的晶格结构的机械响应和能量吸收。SP结构的机械性能和能量吸收优于OP和BP结构。建立有限元模型来研究所有设计配置的机械性能和能量吸收，结果与实验观察结果吻合良好。还引入了刚性-塑性硬化模型来宏观预测设计的晶格结构的机械响应和能量吸收。SP结构的机械性能和能量吸收优于OP和BP结构。建立有限元模型来研究所有设计配置的机械性能和能量吸收，结果与实验观察结果吻合良好。还引入了刚性-塑性硬化模型来宏观预测设计的晶格结构的机械响应和能量吸收。SP结构的机械性能和能量吸收优于OP和BP结构。