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徐仰立,张冬云,胡松涛,陈润平,顾亦磊,陶炯鸣,孔祥森.结构尺寸对Ti6Al4V多孔结构力学性能的影响[J].稀有金属材料与工程(英文),2020,49(5):1736~1742.[Xu Yangli,Zhang Dongyun,Hu Songtao,Chen Runping,Gu Yilei,Tao Jiongming and Kong Xiangsen.Unit Cell Size Effect on Mechanical Properties of Ti6Al4V Porous Structure[J].Rare Metal Materials and Engineering,2020,49(5):1736~1742.]
Unit Cell Size Effect on Mechanical Properties of Ti6Al4V Porous Structure
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Received:March 10, 2019  Revised:April 22, 2019
DOI:
Key words: Selective Laser Melting  Ti6Al4V  porous structure  unit cell size  mechanical properties
Foundation item:国家自然科学基金资助(项目号51675012)
Author NameAffiliation
Xu Yangli,Zhang Dongyun,Hu Songtao,Chen Runping,Gu Yilei,Tao Jiongming and Kong Xiangsen  
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Abstract:
      Topology optimized porous lattice structure with different unit cell size (1~6 mm) and porosity (40~80%) were fabricated by Selective Laser Melting, and their compressive deformation behavior and elastic properties were discussed. The results shown that compressive strength and elastic modulus of lattice structure were inversely proportional to unit cell size. Their compressive strength ranged from 126 to 199 MPa and elastic modulus ranged from 3.5 to 55.47 GPa. The stress-strain curves of lattice structures with different unit cell size followed three kinds of stress-strain laws: elastic material, elastic-brittle material and brittle material. The compressive deformation process was simulated by ABAQUS and explained the reason of two 45° fracture band. The numerical results shown a good agreement with experimental results. The stability was evaluated by Gibson-Ashby model, and the stability parameter C decreased with the increase of unit cell size. Meanwhile, the fitting curves based on Gibson-Ashby model were established, and the value of n increased with the increase of unit cell size. A 3D surface mathematical model combining unit cell size, relative density and relative elastic modulus was established, and the design area satisfying mechanical properties of bone implants was proposed.