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,2020,49(5):1736~1742.[Xu Yangli,Zhang Dongyun,Hu Songtao,Chen Runping,Gu Yilei,Tao Jiongming,Kong Xiangsen.Unit Cell Size Effect on Mechanical Properties of Ti6Al4V Porous Structure[J].Rare Metal Materials and Engineering,2020,49(5):1736~1742.]
结构尺寸对Ti6Al4V多孔结构力学性能的影响
投稿时间:2019-03-10  修订日期:2019-04-22
中文关键词:  激光选区熔化  Ti6Al4V  多孔结构  单元结构尺寸  力学性能
基金项目:国家自然科学基金资助(项目号51675012)
中文摘要:
      采用激光选区熔化技术制造了不同单元结构尺寸(1~6 mm)、孔隙率(40~80%)的拓扑优化多孔阵列结构,研究了单元结构尺寸对其压缩形变规律和弹性性能的影响。结果表明,多孔阵列结构的抗压强度、弹性模量均与单元结构尺寸成反比,抗压强度在126~199 MPa,弹性模量在3.5~55.47 GPa;压缩应力-应变曲线与单元结构尺寸有关,分别遵循弹性、弹脆性和脆性多孔材料三种应力应变规律;通过数值模拟多孔阵列结构的压缩形变过程,解释了两种45°断裂带的成因,力学性能与实验结果基本吻合;利用Gibson-Ashby模型评价多孔结构的稳定性,稳定性参数C与单元结构尺寸成反比;给出Gibson-Ashby拟合方程,特征参数n随单元结构尺寸增加而增大;建立了单元结构尺寸、相对密度和相对弹性模量的三维曲面数学模型,提出骨植入体的设计区域。
Unit Cell Size Effect on Mechanical Properties of Ti6Al4V Porous Structure
英文关键词:Selective Laser Melting  Ti6Al4V  porous structure  unit cell size  mechanical properties
英文摘要:
      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.
作者单位E-mail
徐仰立 激光工程研究院 782013916@qq.com 
张冬云 激光工程研究院  
胡松涛 激光工程研究院  
陈润平 激光工程研究院  
顾亦磊 上海卫星工程研究所  
陶炯鸣 上海卫星工程研究所  
孔祥森 上海卫星工程研究所  
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