多层尺寸梯度面心立方点阵结构力学性能研究  

Study on the Mechanical Behavior of Multilayer Size-Graded Face Center Cubic Lattice Structures

作　　者：张武昆 谭永华[2] 高玉闪 王珺 赵剑 ZHANG Wukun;TAN Yonghua;GAO Yushan;WANG Jun;ZHAO Jian(National Key Laboratory of Science and Technology on Liquid Rocket Engines,Xi’an Aerospace Propulsion Institute,Xi’an 710100,China;Academy of Aerospace Propulsion Technology,Xi’an 710100,China)

机构地区：[1]西安航天动力研究所液体火箭发动机技术重点实验室,西安710100 [2]航天推进技术研究院,西安710100

出　　处：《西安交通大学学报》2023年第11期21-30,共10页Journal of Xi'an Jiaotong University

基　　金：航天先进制造技术研究联合基金资助项目(U1737205);液体火箭发动机重点实验室开放基金资助项目(6142704210403,6142704220403)。

摘　　要：针对均匀点阵结构能量吸收性能低和截面梯度点阵结构刚度性能较差的问题,设计了多层尺寸梯度面心立方点阵结构,通过理论、仿真和试验方法研究了其力学性能。首先,采用SS316L不锈钢材料和选择性激光熔融(SLM)技术,制备了胞元尺寸梯度面心立方(SG-FCC)和均匀面心立方(U-FCC)两种点阵结构的试验件,并进行了准静态压缩试验;然后,在试验和有限元分析的基础上,获得了两种点阵结构在压缩过程的力学行为,基于杆梁变形理论和多层梯度点阵结构刚度组集方法,提出了两种点阵结构的等效弹性模量理论模型;最后,研究了不同梯度因子对SG-FCC点阵结构压缩性能的影响规律。试验结果表明:相比于U-FCC点阵结构,SG-FCC点阵结构的力学性能更加优异,其刚度和比刚度分别增长了17.8%和16.2%,吸能量和比吸能量分别提高了10.8%和10.36%。所提出的SG-FCC点阵结构弹性模量理论模型与试验和有限元分析结果相比吻合较好,误差小于10%,可用于SG-FCC点阵结构的刚度预测;当梯度因子为1.5时,SG-FCC点阵结构的刚度性能较好;当梯度因子为3时,SG-FCC点阵结构的吸能性能较好。该研究可为集高刚度和大吸能性能的轻质化结构设计和工程应用提供参考。This paper aims to address the low energy absorption performance of uniform lattice structures and the poor stiffness performance of cross-section gradient lattice structures.To this end,a multilayer size gradient FCC lattice structure was designed and its mechanical properties were investigated through theoretical,numerical,and experimental methods.Firstly,size-graded face center cubic(SG-FCC)and uniform face center cubic(U-FCC)lattice structures were fabricated using the SS316L stainless steel and selective laser melting(SLM)technology.The quasi-static compression tests were also carried out.Then the mechanical properties of the two lattice structures during compression were obtained from the tests and finite element analysis results.In addition,the equivalent elastic modulus analytical models were proposed for both lattice structures based on the deformation theory of beams and the stiffness set method of gradient lattice structures.Finally,the study explored the influence of different gradient factors on the compressive performance of the SG-FCC lattice structures.The results showed that the mechanical properties of the SG-FCC lattice were superior to those of the U-FCC lattice.Specifically,the stiffness and specific stiffness of the SG-FCC lattice increased by 17.8%and 16.2%respectively,and the absorption energy and specific absorption energy increased by 10.8%and 10.36%respectively.Furthermore,the theoretical elastic modulus model of SG-FCC lattices was in good agreement with the experimental and finite element results.The prediction error was less than 10%,which could be used to predict the stiffness of the SG-FCC lattice structure.When the gradient factor was 1.5,the stiffness properties of the SG-FCC lattice structure were better than those of other gradient factors.When the gradient factor was 3,the energy absorption properties of the SG-FCC lattice structure were better than those of other gradient factors.The research findings offer guidance for the design and engineering application of lightweight st

关 键 词：梯度面心立方点阵结构 弹性模量 压缩性能 梯度因子 有限元分析 

分 类 号：V414.9[航空宇航科学与技术—航空宇航推进理论与工程]