1 Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300384, China
2 National Demonstration Center for Experimental Mechanical and Electrical Engineering Education(Tianjin University of Technology), Tianjin 300384, China
3 School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China
4 Tianjin Langmiu New Material Technology Co., Ltd., Tianjin 300457, China
The coupling effect between stress and galvanic corrosion on bimetallic screws in the femoral environment was systematically investigated for the sake of providing a theoretical basis for the wear prevention and control of a novel degradable screw used in the treatment of vertical femoral neck fractures(Pauwels type III). A three-dimensional model of the femoral based on the CT data was created. With respect to the assembled screws, three geometric structures were proposed, and two sets of material properties, namely Ti/Mg (titanium/magnesium alloy) and Ti/Zn (titanium/zinc alloy) were assigned to afford different mechanical and electrochemical characteristics. Through a multi-physics finite element model, the electrochemical corrosion behaviors and stresses of the screws at different degrees were coupled and analyzed. The research results show that, in the 120-day corrosion process, the Ti/Zn composite screw had the maximum current density and maximum stress at the defect of 0.063 2 A/m2 and 35 MPa, respectively, which are 94.18% and 86.06% less than those of the Ti/Mg composite (maximum current density at the defect of 1.083 A/m2 and a stress of 251 MPa). An Sc/Sa of 0.43 had a significant effect on both single corrosion and load-bearing(the maximum current density and maximum stress of this type of screw in the Ti/Mg composite were 0.377 1 A/m2 and 184 MPa, respectively), lower than that for Sc/Sa values of 3.34 and 1.11, by a significant margin. The stress concentration effect is higher than the yield point of the material (maximum stress of 251 MPa), through an interaction with corrosion, had a remarkable effect on which the material degradation was strongly accelerated(corresponding to an accelerated corrosion thickness of 53 μm). The coupling effect of galvanic corrosion and mechanical stress on the mechanical properties and corrosion resistance of bimetallic materials has a great influence. Optimizing factors such as the geometric structure of the Sc/Sa metal sleeve and the corrosion potential difference can improve the corrosion resistance and mechanical stability of the screw.
LI De-zhi, ZHAN Nan, ZHANG Xiao-chuan, SONG Zhen-xing.
Analysis of Mechanical-Electrochemical Coupling Behavior of Bimetallic Hollow Screws[J].
Science Technology and Engineering, 2026, 26(30): 12950-12960 DOI:10.12404/j.issn.1671-1815.2508118
在Solid Works 2020(Dassault Systemes,美国)中,使用等距法构建了股骨皮质骨和松质骨以创建股骨近端模型(未进行骨折处理)。由于模型中Mg合金和Zn合金发生腐蚀,因此金属套筒的外表面向内移动,在两金属接触点向内引入了0.1 mm的小台阶,以确保在仿真过程中保留几何拓扑结构。将单根螺钉沿着股骨颈轴线植入,位于股骨颈的中心位置;轴线是在MATLAB(MathWorks公司,美国)中自动计算得出[12]。如图2所示,将上述的每一种螺钉单独与股骨组装,共创建了6个模型。
本次仿真所取的股骨、Ti合金、Mg合金及Zn合金分别来自文献[14-17]。力学参数包括泊松比(ν)和弹性模量(E),具体数值如表2所示。电化学参数通过拟合Lu等[15]的实验曲线得到,包括反应的标准平衡电位(Eeq)、交换电流密度(i0)、塔菲尔斜率(b)。使用模拟体液(simulated body fluid,SBF)来代表松质骨内的电解环境,其电导率为1.4 S/m,温度为37 ℃。具体数值如表3所示。
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