Mechanical properties and deformation behavior under compressive loading of selective laser melting processed bio-inspired sandwich structures

被引：53
作者：
Hu, Kaiming [1 ,2 ]
Lin, Kaijie [1 ,2 ]
Gu, Dongdong [1 ,2 ]
Yang, Jiankai [1 ,2 ]
Wang, Haoran [1 ,2 ]
Yuan, Luhao [1 ,2 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Yudao St 29, Nanjing 210016, Jiangsu, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Jiangsu Prov Engn Lab Laser Addit Mfg High Perfor, Yudao St 29, Nanjing 210016, Jiangsu, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2019年 / 762卷
基金：
中国国家自然科学基金;
关键词：
Bio-inspired; Sandwich structure; Selective laser melting; Deformation behavior; Finite element analysis; ENERGY-ABSORPTION CHARACTERISTICS; VELOCITY IMPACT BEHAVIOR; CORRUGATED-CORE; CELLULAR STRUCTURES; DYNAMIC-RESPONSE; TI-6AL-4V ALLOY; TENSILE PROPERTIES; HEAT-TREATMENT; MICROSTRUCTURE; TI6AL4V;
D O I：
10.1016/j.msea.2019.138089
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Sandwich structures are widely used in aviation and aerospace applications because of their outstanding characteristics of light-weight, excellent energy absorption and continuous compression behaviors. Nature has provided us with extraordinary resources to meet the demanding for modern industry. In this study, inspired by the microstructures of the Norway spruce stem, four light-weight sandwich structures were designed and manufactured by selective laser melting (SLM). The structures had good formability using an optimized laser processing parameter setting. The uniaxial compression tests of SLM-processed bio-inspired sandwich structures were conducted to evaluate their specific compressive strength and energy absorption performance. Finite element analysis was employed to study stress distributions in structures during compression tests and analyze fracture mode combining with the observation of fracture surface morphology. The experimental and numerical results indicated that the gradient structure, with tube size gradually decreasing from top and bottom plate towards the center, exhibited the highest specific absorption energy, ultimate strength and specific strength, which was 5.73 J/g, 214.8 MPa and 98.99 MPa/(g/cm(3)), respectively. The FEA results revealed that the arrangement of tubes significantly affected the stress distribution and fracture locations of structures. The gradient structure, with the highest specific absorption energy and ultimate strength, had the most uniform stress distributions, contributing to its excellent compressive performance.
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页数：12
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