Peron Mirco, Torgersen Jan, Berto Filippo
Department of Industrial and Mechanical Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2b, 7034 Trondheim, Norway.
Materials (Basel). 2018 Oct 10;11(10):1923. doi: 10.3390/ma11101923.
In recent years, the need of surgical procedures has continuously increased and, therefore, researchers and clinicians are broadly focusing on the development of new biocompatible materials. Among them, polyetheretherketone (PEEK) has gained wide interest in load-bearing applications due to its yielding behaviour and its superior corrosion resistance. To assure its reliability in these applications where notches and other stress concentrators weaken implants resistance, a design tool for assessing its tensile and fatigue behaviour in the presence of geometrical discontinuities is highly claimed. Herein, a new fatigue design method based on a local approach is proposed for PEEK implant, and the results are compared with those obtained using the two main biomaterial design approaches available in literature, i.e., the theory of critical distances (TCD) and the notch stress intensity factor (NSIF) approach. To this aim, previously published datasets of PEEK-notched specimens are used, and the proposed method is reported to provide more accurate results and to be robust for different notch geometries.
近年来，外科手术的需求持续增长，因此，研究人员和临床医生广泛关注新型生物相容性材料的开发。其中，聚醚醚酮（PEEK）因其屈服行为和卓越的耐腐蚀性，在承重应用中引起了广泛关注。为确保其在存在缺口和其他应力集中器会削弱植入物抗性的这些应用中的可靠性，迫切需要一种用于评估其在几何不连续情况下拉伸和疲劳行为的设计工具。在此，针对PEEK植入物提出了一种基于局部方法的新疲劳设计方法，并将结果与使用文献中现有的两种主要生物材料设计方法（即临界距离理论（TCD）和缺口应力强度因子（NSIF）方法）获得的结果进行比较。为此，使用先前发表的PEEK缺口试样数据集，结果表明所提出的方法能提供更准确的结果，并且对于不同的缺口几何形状具有鲁棒性。
