| 引用本文: | 王沫楠,王红晶,杜志江.股骨假体热应力有限元分析[J].哈尔滨工业大学学报,2012,44(7):38.DOI:10.11918/j.issn.0367-6234.2012.07.007 |
| WANG Mo-nan,WANG Hong-jing,DU Zhi-jiang.Finite element analysis of thermal stress of femoral prosthesis[J].Journal of Harbin Institute of Technology,2012,44(7):38.DOI:10.11918/j.issn.0367-6234.2012.07.007 |
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| 摘要: |
| 为定量研究材料热物性对股骨-假体系统应力的影响,以热弹性力学为基础,利用有限元方法对髋关节置换后股骨-假体系统的应力进行分析．假设假体、骨水泥、股骨为线弹性和各向同性材料且完全结合的同心圆柱体,经力学分析和有限元仿真,分别求得钛合金和钴铬合金作为假体材料时考虑热效应前后的假体／骨水泥、骨水泥／股骨随轴向位置分布的界面剪切应力以及假体、骨水泥、股骨的轴向应力．结果表明:界面失效是股骨-假体系统的主要失效形式,热效应使界面产生了混合而不是纯剪切的失效形式,加快了股骨-假体系统的界面失效,加速了假体柄的松动;由于钴铬合金的热膨胀系数大于钛合金,钴铬合金作为假体材料时更易引起界面失效,导致手术失败．选择热膨胀系数小的假体材料,可以减小界面失效的可能性,提高手术成功率． |
| 关键词: 股骨 假体 钛合金假体；钴铬合金假体；热应力 有限元分析 |
| DOI：10.11918/j.issn.0367-6234.2012.07.007 |
| 分类号:R496 |
| 基金项目:国家自然科学基金资助项目（61073144）; 黑龙江省新世纪优秀人才培养计划资助项目（251NCET006）; 机器人技术与系统国家重点实验室开放研究资助项目. |
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| Finite element analysis of thermal stress of femoral prosthesis |
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WANG Mo-nan,WANG Hong-jing,DU Zhi-jiang
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1.State Key Laboratory of Robotics and System, Harbin Institute of Technology, 150080 Harbin, China;2.College of Mechanical and Power Engineering, Harbin University of Science and Technology, 150080 Harbin, China
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| Abstract: |
| To study the influence of thermo property on stress of femur-prosthesis system quantitatively, the finite element method is used to analyze the stress of femur-prosthesis system when the hip joint has been replaced, in which the prosthesis, bone cement and femur are assumed as linear elastic and isotropic materials in shape of a concentric cylinder. Considering the thermal effect, the axial stress of prosthesis, bone cement, femur and the interface shear stress along axial of the prosthesis／bone cement and bone cement／femur when the prosthesis are made of titanium alloy and cobalt-chromium alloy are acquired separately by mechanical analysis and FEM simulation.The results indicate that the interface failure is the primary failure mode of the femur-prosthesis system. The existence of thermal effect accelerates the interface failure of femur-prosthesis system and the loose of prosthesis stem. The possibility of interface failure which result in operation failure will ascend when the cobalt-chromium alloy is used, because the thermal expansion coefficient of cobalt-chromium alloys is higher than that of titanium alloy. |
| Key words: femur prosthesis titanium prosthesis cobalt-chromium prosthesis thermal stress finite element analysis |
