Reduction of the fracture risk of modular taper interfaces in orthopedic implants by enhancing their resistance towards fatigue and fretting-corrosion by the application of targeted surface modifications

通过应用有针对性的表面改性来增强其抗疲劳和微动腐蚀的能力,从而降低骨科植入物中模块化锥形接口的断裂风险

基本信息

项目摘要

From a clinical point of view, the modular interfaces of revision hip implants are subject to an increased risk of fracture, which can result in costly follow-up operations for patients. The aim of the project is to improve the durability of these modular interfaces and to significantly reduce the risk of fracture. This is to be realized by means of targeted surface modifications at the modular taper interface. The machining processes aim at reducing the susceptibility of the interface to material fatigue under combined mechanical-corrosive loading. The focus lies thereby on the targeted induction of residual stresses (RS) in the near- surface, because residual stresses are known to have a high impact on the fatigue properties of metallic materials. In the joint project, different mechanical surface treatment processes (deep rolling, shot peening, turning) will be used to modify the outer cone surface, resulting in different residual stress depth distributions and different surface roughness. Aside from optimizing the interface, a better understanding of the effects of mechanical surface treatments on the fatigue behavior in a corrosive environment is sought because little is known about the effect of residual stresses in loading situations which comprise mechanical and corrosive stress. A systematic approach is intended to investigate the influence of the factors residual stress state of the joining partners, cone topography and cone geometry on the durability of the interface. For all variations of the cone interface, the frictional fatigue behavior under combined dynamic-mechanical loading will be characterized in a physiological framework. Furthermore, the stability of the RS during the dynamic loading is analyzed to evaluate the effectiveness of the RS over the course of the fatigue tests. Subsequently, corrosive loading is added to the loading scenario to evaluate whether the failure of the cone interfaces is fatigue-driven or corrosion-driven. Finally, long-term dynamic tests with a constant load level will serve to evaluate the effects of the different surface modifications under combined mechanical and fretting-corrosive loading. The knowledge gained during the project will allow implant manufacturers to address the hitherto unsolved problem of frictional-corrosive wear and the resulting increased risk of implant fracture. Ultimately the historically established taper interfaces will be specifically adapted to the demands of modern implant systems. Finally, the project aims on minimizing material- and design-related implant failures and on a significant reduction of the burden on patients and the healthcare system.
从临床角度来看,髋关节翻修植入物的组配式界面发生骨折的风险增加,这可能导致患者的后续手术费用高昂。该项目的目的是提高这些模块化接口的耐用性,并显着降低骨折的风险。这将通过组配式锥体界面处的目标表面修改来实现。机械加工工艺的目的是减少界面的敏感性,材料疲劳下的组合机械腐蚀负荷。因此,焦点在于近表面中残余应力(RS)的有针对性的诱导,因为已知残余应力对金属材料的疲劳特性具有很大影响。在联合项目中,将使用不同的机械表面处理工艺(深滚、喷丸、车削)来修改外锥表面,从而产生不同的残余应力深度分布和不同的表面粗糙度。除了优化界面,更好地了解机械表面处理对腐蚀环境中疲劳行为的影响,因为很少有人知道在负载情况下,包括机械和腐蚀应力的残余应力的影响。系统地研究了连接件残余应力状态、锥体形貌和锥体几何形状等因素对界面耐久性的影响。对于锥体界面的所有变化,将在生理学框架中表征动态-机械载荷组合下的摩擦疲劳行为。此外,在动态加载过程中的RS的稳定性进行了分析,以评估RS的有效性的疲劳试验的过程中。随后,将腐蚀载荷添加到载荷方案中,以评估锥体界面的失效是疲劳驱动还是腐蚀驱动。最后,在恒定载荷水平下进行长期动态试验,以评估机械和微动腐蚀载荷联合作用下不同表面改性的效果。在该项目中获得的知识将使种植体制造商能够解决迄今为止尚未解决的摩擦腐蚀磨损问题以及由此导致的种植体断裂风险增加。最终,历史上建立的锥连接界面将专门适应现代种植体系统的需求。最后,该项目旨在最大限度地减少与材料和设计相关的植入物失效,并显著减轻患者和医疗保健系统的负担。

项目成果

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Dr.-Ing. Jens Gibmeier其他文献

Dr.-Ing. Jens Gibmeier的其他文献

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{{ truncateString('Dr.-Ing. Jens Gibmeier', 18)}}的其他基金

Minimisation corrosive attack in the conus-interface of modular endoprothesis by means of definite surface modification via warm deep rolling
通过温深滚压进行明确的表面改性,最大限度地减少模块化内置假体圆锥界面的腐蚀侵蚀
  • 批准号:
    382919963
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Neutron residual stress analysis for multiphase materials with depth gradients of the strain free / independent lattice parameter D0
具有无应变/独立晶格参数 D0 深度梯度的多相材料的中子残余应力分析
  • 批准号:
    282874578
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Hot crack assessment during welding using novel LTT weld filler materials
使用新型 LTT 焊接填充材料评估焊接过程中的热裂纹
  • 批准号:
    254003098
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Thermal spraying of thick film systems - process optimization by means of residual stress and residual stress stability
厚膜系统热喷涂 - 通过残余应力和残余应力稳定性优化工艺
  • 批准号:
    230530734
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Cracking resistance enhancement of high strength welded joints through the application of modern weld filler materials with low transformation temperatures (LTT)
通过应用低转变温度 (LTT) 的现代焊接填充材料增强高强度焊接接头的抗裂性
  • 批准号:
    188906270
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Experimental Analysis of multiaxial residual stress states induced by laser surface hardening
激光表面硬化引起的多轴残余应力状态的实验分析
  • 批准号:
    206828805
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
In-situ Untersuchungen während des Schweißens mit LTT-Zusatzwerkstoffen
LTT 填充材料焊接过程中的现场调查
  • 批准号:
    71503100
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Residual stresses in welded joints of work hardening steels with high manganese content
高锰加工硬化钢焊接接头的残余应力
  • 批准号:
    441694070
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Influence of residual stresses on the crack propagation behavior in microstructurally graded samples manufactured by laser based additive manufacturing
残余应力对激光增材制造微结构梯度样品裂纹扩展行为的影响
  • 批准号:
    505457585
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Assessment of local residual stress distributions at the local repair of components by means of cold gas spraying
通过冷气体喷涂评估部件局部修复时的局部残余应力分布
  • 批准号:
    452606919
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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关节镜辅助胫骨平台固定术 (AATPF) 与切开复位内固定术 (ORIF):一项多中心随机对照试验
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    7330620
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