晶格结构因具有结构质量轻、隔音性能好、比强度高、比刚度高以及吸振性能好等优点,在航空航天、汽车制造、生物医疗等领域应用广泛。为了研究梯度策略与梯度晶格结构力学响应之间的联系,本研究设计具有不同梯度策略的梯度晶格结构,并采用选区激光熔化技术制备相应的零件,通过模拟仿真与实验验证相结合的方法对梯度晶格结构的压缩性能展开研究。结果表明：在压缩过程中晶胞的节点是应力的主要分布位置,均匀结构、单向梯度结构和双向梯度结构表现出不同的变形行为。梯度晶格结构的弹性模量、屈服强度、抗压强度和平台应力均高于均匀结构。双向梯度结构的力学性能优于单向梯度结构,能量吸收性能高于均匀结构和单向梯度结构。本研究可为预测不同梯度晶格结构的压缩响应提供技术支持。
Lattice structures are increasingly utilized in aerospace, automotive manufacturing, and biomedical fields due to their advantages of lightweight construction, excellent sound insulation, high specific strength, high specific stiffness, and superior vibration absorption properties. To investigate the relationship between gradient strategies and the mechanical response of gradient lattice structures, this study designed gradient lattice structures with different gradient strategies and fabricated corresponding specimens using selective laser melting technology. The compressive properties of these structures were systematically investigated through a combined approach of simulation and experimental validation. The results indicate that during compression, the nodes of the lattice cells serve as primary stress concentration locations. Uniform structures, unidirectional gradient structures, and bidirectional gradient structures exhibit distinct deformation behaviors. Gradient lattice structures exhibit higher elastic modulus, yield strength, compressive strength, and plateau stress compared to uniform structures. Furthermore, bidirectional gradient structures demonstrate superior mechanical properties over unidirectional gradient structures and superior energy absorption performance compared to both uniform and unidirectional gradient structures. This study provides technical support for predicting the compressive response of diverse gradient lattice structures.
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