【摘要】 在人工髋关节假体柄承受压力作用下,假设股骨和假体柄为完全结合的同心圆柱体,建立了一个相对完善的界面应力传递理论模型,获得了界面剪切应力和径向应力随轴向位置变化的分布.界面最大的剪应力发生在z=0处,即股骨颈的截面上.随着z的增大,界面剪应力呈幂指数减小.重要的是使得股骨假体柄与股骨之间界面应力在假体柄轴向上沿长度保持为一定常数且与施加于假体柄z=0处的压力相平衡,这样就不会出现股骨局部应力集中和假体柄下沉的现象.假设0<z<0.1 m区域内的剪应力值等于z=0.1 m处的值,计算出假体柄半径a随轴向位置变化的分布,进而为假体柄表面尺寸的设计提供一个理论参考依据.更多还原

【Abstract】 Under the compressive load on the manual hip joint prosthesis,when the femur and prosthesis were considered as concentric cylinders with perfectly bonded interface,a relatively perfect theoretical model simulating the interfacial stress transfer was established,and distributions of the interfacial shear and radial stresses with the axial positions were obtained.The maximum interfacial shear stress occurs at the position of z=0,namely,the cross section of the femur neck.The interfacial shear stress decreases exponentially with the increasing of z.It is important to keep the interfacial shear stress of the prosthesis/femur interface along the axial direction of the prosthesis constant and balanced with the pressure load at the position of z=0 on the prosthesis,thus local stress concentration and prosthesis sink can be avoided.When the shear stress values within the region of 0<z<0.1 m were assumed to be equal to that at the position of z=0.1 m,distributions of the prosthesis radius a with the axial positions were calculated,providing a theoretical reference for the design of the surface size of the prosthesis.更多还原