复杂受力下股骨应力分析  

Analysis on femur stress under complex load

作　　者：赵均海[1] 刘彦东[1] 

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《医用生物力学》2006年第4期317-321,共5页Journal of Medical Biomechanics

基　　金：教育部博士点基金资助项目(20040710001);陕西省自然科学基金资助项目(2005E204)

摘　　要：目的对人体在行走时身体发生扭曲、跌倒等情况下股骨可能发生在弯矩和压力复合荷载作用下的受力问题进行研究,为人工股骨头置换的设计和手术提供指导。方法应用大型通用有限元软件ANSYS进行受力分析,根据人体股骨的实际尺寸,采用plate42单元建立平面模型,将股骨头传递的关节力的作用点向外偏移为0mm、5mm、10mm、15mm,模拟股骨头受弯矩作用的情况下股骨应力分布。结果得出了在弯压复合荷载下股骨的变形、应力云图、股骨颈和股骨干上端的截面应力。结论股骨颈存在较大的应力集中现象,股骨颈外侧承受较大的拉应力,股骨颈内侧承受较大的压应力,股骨干在垂直方向上外侧为拉应力,内侧为压应力。随着弯矩的增加股骨的应力有明显增加。Objective To study the stress of human femur under the bending moment and compressive load with considering accident twist or tumble happens to the human body in walk. Methods Adopted the Finite Element Method analysis software ANSYS. Based the trim size of human femur, develop plane model using plate42 cell. Excursion the load of node j to outside δ 0 mm. 5 mm. 10 mm. 15mm passed by femur head, simulate the stress distributing of the femur head under the bending moment. Results Obtained the distortion deformation, stress nephogram, section stress of femur neck and upside of femoral shaft of the femur under the bending moment and compressive load. Conclusion There＇s a large stress concentration at femur neck. The large tension stress is concentrated at the outside stress nephogram of femur neck, while the inside of it has large compressive stress. The outside of femoral shaft has large tension stress in perpendicular orientation, while the inside of it has large compressive stress. With the increase of bending moment, the stress of femur increases evidently.

关 键 词：弯压复合荷载 股骨 应力 有限元分析 

分 类 号：R318.01[医药卫生—生物医学工程]