钴铬合金是常用的人造骨骼材料,其多孔结构直接影响力学性能。应用选区激光熔化工艺成形多孔钴铬合金,设计4种常见的单元结构模型,通过数值模拟和实验验证,研究单元结构参数对多孔骨架抗压强度、弹性模量和应力应变关系等力学性能的影响。实验结果表明,具有交叉单元结构的多孔合金力学性能最优,结构中的形状突变会导致力学性能大幅降低,孔径的增大会降低合金力学性能,减小速率成反比例函数型减小。实验中所设计的A750和C结构的钴铬合金多孔骨具有较好的力学性能,满足人造骨骼的压缩性能需求。

Cobalt-chromium alloy is a commonly used artificial bone material, and its porous structure directly affects the mechanical properties. The porous cobalt-chromium alloy was formed by the selective laser melting process, and four common cell structure models were designed. Through numerical simulation and experimental verification, the mechanical properties of the porous structure, such as compressive strength, elastic modulus and stress-strain relationship were studied. The experimental results show that the mechanical properties of the porous alloy with cross-cell structure are optimal, and the shape change in the structure will lead to a substantial reduction in mechanical properties. The increase of pore size will reduce the mechanical properties of the alloy and decrease the rate of inverse proportional function type reduction. The cobalt-chromium alloy porous bones of A750 and C structures designed in the experiment have good mechanical properties and meet the compression performance requirements of artificial bones.