| 摘要: |
| 随着增材制造技术的发展，使更为复杂的多孔材料制造得以实现，三维点阵的轻量化设计方法有望为航天发动机的减重增效带来全新途径。针对现有极小曲面点阵结构力学性能计算复杂问题，本文研究了初始极小曲面结构（Primitive Triply Periodic Minimal Surface, P-TPMS）及其加肋增强结构（Ribbed Primitive Triply Periodic Minimal Surface, RP-TPMS）的等效弹性参数与变形行为，及二者受相对密度改变的影响规律，提出解析模型，显著提高了RP-TPMS结构等效弹性模量的计算效率。基于有限元方法对P-TPMS结构与RP-TPMS结构的计算结果进行对比，结果表明：垂直加肋设计可以有效提高P-TPMS结构的等效弹性模量。 |
| 关键词: 激光选区熔化 点阵结构 力学性能 加肋结构 |
| 基金项目:国防科工局基础科研课题（JCK******B052） |
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| Study on Equivalent Elastic Properties of Ribbed Minimal Surface Lattice Structures Based on Additive Manufacturing |
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Cai Jiaxin Bai Jing Xie Chong Yang Xi Yang Huanqing
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Xi’an Space Engine Co., Ltd., Xi’an 710100
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| Abstract: |
| In recent years, with the rapid development in additive manufacturing (AM) technique, a series of porous structures with complex geometries can be manufactured. Lightweight design based on three-dimensional lattice structure is expected to bring a new method to the weight reduction of liquid rocket engines. This paper investigates the equivalent elastic parameters of the primitive triply periodic minimal surface (P-TPMS) structure and its ribbed primitive triply periodic minimal surface (RP-TPMS), as well as the deformation behavior and the influence of relative density changes on both. An analytical model has been proposed, which can efficiently and accurately predict the equivalent elastic properties of the RP-TPMS lattice structure according to the P-TPMS lattice and ribbed equivalent elastic properties, greatly improving the calculation efficiency equivalent elastic properties of the RP-TPMS. Based on the finite element method, by comparing the calculation results of the P-TPMS structure with the RP-TPMS lattice structure, showing that the vertical ribbed design can effectively improve the equivalent elastic properties of the P-TPMS structure. |
| Key words: selective laser melting lattice structure mechanical properties ribbed structure |
