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首页> 外文会议>Modularity and tapers in total joint replacement devices >Tribocorrosion in Hip Modular Taper Junctions: Load-Triggered Transitions in Electrochemical and Mechanical Behavior
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Tribocorrosion in Hip Modular Taper Junctions: Load-Triggered Transitions in Electrochemical and Mechanical Behavior

机译：髋部模块化锥型接头中的摩擦腐蚀：电化学和机械行为中的载荷触发跃迁

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摘要

Modular hip junctions operate in a challenging environment. This includes exposure to cyclic loads, micromotions at the interfaces, and a shifting local chemical environment. The objectives of this study are to identify the tribocorrosion mechanisms in mixed-metal contacts under a simulated joint environment at various axial loads at two pH levels. Fretting-corrosion tests were conducted in a custom-made apparatus, by articulating a square Ti-6Al-4V-alloy rod with two, axially loaded, CoCrMo pins (15 cm~2 exposed surface area) in a flat-on-flat contact system. Bovine calf serum (BCS) solution was used as an electrolyte (electrolyte volume = 70 mL with 30 g/L protein content). A sinusoidal fretting motion, with a displacement amplitude of ±50 μm was applied to the Ti-6Al-4V-alloy rod. To evaluate the effect of load, a range of normal loads (50-800 N) was applied at two different pH levels (pH 3.0 and pH 7.6). We observed variations in electrochemical potential and dissipated friction energy that were both functions of load and pH. Under gross slip conditions, there was an increase in magnitude of potential drop as a function of load until a critical value was reached. This was likely related to the incremental increase in the tribo-activated area. At high load, the fretting zone was in the stick-slip fretting region, where the sliding amplitude was almost zero. Hence, at high load, the reduction in the magnitude of potential drop is caused by a reduced tribo-activated area. In addition, the presence of a tribofilm was observed at high load, possibly offering electrochemical protection to the surface. The data indicate that mechanistic transitions in the fretting-corrosion behavior of modular junctions depend on applied load and pH.
机译：模块化髋关节在充满挑战的环境中运行。这包括承受周期性载荷，界面处的微动以及变化的局部化学环境。这项研究的目的是确定在模拟的联合环境下，在两个pH值的各种轴向载荷下，混合金属触点中的摩擦腐蚀机理。微动腐蚀试验是在定制设备中进行的，方法是将方形的Ti-6Al-4V合金棒与两个轴向加载的CoCrMo插针（暴露的表面积为15 cm〜2）铰接在一起。系统。牛犊血清（BCS）溶液用作电解质（电解质体积= 70 mL，蛋白质含量为30 g / L）。对Ti-6Al-4V合金棒施加正弦微动运动，位移幅度为±50μm。为了评估负载的影响，在两个不同的pH值（pH 3.0和pH 7.6）下施加了一定范围的正常负载（50-800 N）。我们观察到了电化学电势和耗散的摩擦能量的变化，它们都是负载和pH的函数。在总滑移条件下，电位降的大小随载荷的增加而增加，直到达到临界值为止。这可能与摩擦激活区域的增加有关。在高负载下，微动区位于粘滑微动区，滑动幅度几乎为零。因此，在高负载下，电位下降幅度的减小是由减小的摩擦激活面积引起的。另外，在高负荷下观察到摩擦膜的存在，可能对表面提供电化学保护。数据表明，模块化结的微动腐蚀行为中的机械转变取决于所施加的载荷和pH。

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  • 来源
  • 会议地点 New Orleans LA(US)
  • 作者

    Mathew T. Mathew; Megha Patel; Dmitry Royhman; Maria Runa; Joshua Jacobs; Markus A. Wimmer; Nadim J. Hallab;

  • 作者单位

    Rush University Medical Center, Dept. of Orthopedic Surgery, 1611 West Harrison St., Chicago, IL 60612;

    Rush University Medical Center, Dept. of Orthopedic Surgery, 1611 West Harrison St., Chicago, IL 60612,University of Illinois at Chicago, Medical Biotechnology, Dept. of Biomedical Science, 1601 Parkview Ave., Rockford, IL 61101;

    Rush University Medical Center, Dept. of Orthopedic Surgery, 1611 West Harrison St., Chicago, IL 60612;

    Rush University Medical Center, Dept. of Orthopedic Surgery, 1611 West Harrison St., Chicago, IL 60612,Universidade do Minho, Center for Mechanical and Materials Technologies (CT2M), Campus de Azurem, 4800-058 Guimaraes, Portugal;

    Rush University Medical Center, Dept. of Orthopedic Surgery, 1611 West Harrison St., Chicago, IL 60612;

    Rush University Medical Center, Dept. of Orthopedic Surgery, 1611 West Harrison St., Chicago, IL 60612;

    Rush University Medical Center, Dept. of Orthopedic Surgery, 1611 West Harrison St., Chicago, IL 60612;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    modularity; fretting corrosion; friction energy; metal-on-metal;

    机译：模块化微动腐蚀；摩擦能金属对金属;

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