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徐榕蔚, 张振杰, 刘清原, 张光辉, 龙芋宏. 选区激光熔化制备多孔结构的成形偏差及力学性能与压缩失效分析[J]. 焊接学报, 2022, 43(10): 49-56. DOI: 10.12073/j.hjxb.20211005001
引用本文: 徐榕蔚, 张振杰, 刘清原, 张光辉, 龙芋宏. 选区激光熔化制备多孔结构的成形偏差及力学性能与压缩失效分析[J]. 焊接学报, 2022, 43(10): 49-56. DOI: 10.12073/j.hjxb.20211005001
XU Rongwei, ZHANG Zhenjie, LIU Qingyuan, ZHANG Guanghui, LONG Yuhong. The forming deviation, mechanical properties and compression failure of porous structures fabricated by laser melting were analyzed[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(10): 49-56. DOI: 10.12073/j.hjxb.20211005001
Citation: XU Rongwei, ZHANG Zhenjie, LIU Qingyuan, ZHANG Guanghui, LONG Yuhong. The forming deviation, mechanical properties and compression failure of porous structures fabricated by laser melting were analyzed[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(10): 49-56. DOI: 10.12073/j.hjxb.20211005001

选区激光熔化制备多孔结构的成形偏差及力学性能与压缩失效分析

The forming deviation, mechanical properties and compression failure of porous structures fabricated by laser melting were analyzed

  • 摘要: 因多孔结构轻质高强度、力学性能可调节的特点,被广泛用于骨骼医疗、航空航天等领域. 为了探索多孔结构选区激光熔化(Selective Laser Melting, SLM)成形误差与压缩失效性能,以钻石型晶格和六孔开口球形两种多孔结构为例,采用理论预测与试验测试研究SLM制造多孔结构的压缩力学行为,使用ANSYS软件对所研究的多孔结构进行准静态压缩模拟,并对SLM成形的多孔结构进行单轴压缩试验,最后结合仿真和试验,观测和分析它们的变形过程和失效机制. 对比后发现数值设计的多孔结构尺寸与最终制造的结构存在偏差,导致力学性能理论值与试验值存在一定差异,但应力应变场变化规律一致. 试验结果表明,在孔隙率50% ~ 80%时,钻石型晶格结构屈服强度为31.85 ~ 182.13 MPa,弹性模量为1.45 ~ 2.30 GPa;六孔开口球形结构屈服强度为35.19 ~ 130.64 MPa,弹性模量为1.59 ~ 2.90 GPa,不同多孔结构随孔隙率的增大,力学性能变化趋势不一致.

     

    Abstract: Due to the characteristics of light, high strength and adjustable mechanical properties of porous structure, it is widely used in bone medicine, aerospace and other fields. In order to explore the forming error and compression failure performance of porous structure with selective laser melting (SLM), this paper takes two kinds of porous structure with diamond lattice and spherical six-hole opening as examples to study the compressive mechanical behavior of porous structure manufactured by SLM by theoretical prediction and experimental test. ANSYS software was used to simulate the quasi-static compression of the studied porous structure, and the uniaxial compression experiment of the SLM formed porous structure was carried out. Finally, the deformation process and failure mechanism of the SLM formed porous structure were observed and analyzed combined with the simulation and experiment. After comparison, it is found that the size of the numerical design porous structure deviates from that of the final manufactured structure, resulting in a certain difference between the theoretical value of mechanical properties and the experimental value, but the variation law of stress and strain field is consistent. The experimental results show that when the porosity is 50% ~ 80%, the yield strength and elastic modulus of diamond lattice structure are 31.85 ~ 182.13 MPa and 1.45 ~ 2.30 GPa respectively. The yield strength and elastic modulus of six-hole spherical structure are 35.19 ~ 130.64 MPa and 1.59 ~ 2.90 GPa respectively. The mechanical properties of different porous structures vary with the increase of porosity.

     

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