A Novel Approach for Assessing the Fatigue Behavior of PEEK in a Physiologically Relevant Environment

Materials

Mirco Peron¹  Jan Torgersen¹  Filippo Berto¹ 

[1] Department of Industrial and Mechanical Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2b, 7034 Trondheim, Norway;

关键词: fatigue assessment;    PEEK;    strain energy density;    theory of critical distances;    NSIF;    biomaterial;    PEEK implants;   

DOI  :  10.3390/ma11101923

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown