Typically PEEK composite materials have been used as a replacement for metallic and ceramic implants, which have a higher modulus of elasticity (Kurtz. When considering PEEK specifically, the effects of short fibre reinforcement on fatigue crack propagation were considered in and where an average planar fibre orientation was assumed. PEEK has the best fatigue resistance of any resin, and the combination of excellent mechanical strength properties and fatigue resistance is the most outstanding of all plastics, with performance not inferior to that of some alloys with hence the mechanical properties. NSIF PEEK PEEK implants biomaterial fatigue assessment strain energy density theory of critical distances. Polyetheretherketone (PEEK) is a thermoplastic polymer that was commercialized in the early 1980s and later proposed as a material to be used for medical applications (Panayotov et al., 2016). 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. 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. No significant change in tensile properties was observed, but a decrease of 25 in fatigue strength was observed. 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. Bioengineering 2017, 5, 18 2 of 10 of carbon/PEEK laminates were also studied 16. Compared to the two main methods used in. The authors have utilized a previously supplied dataset where different notch geometries in a physiologically relevant environment have been tested, revealing how PEEK fatigue behaviour is notch-sensitive. As the mechanical strength is continuous in all processing conditions. A common procedure involves the use of stress/life information to predict the expected life (or expected stress for a particular probability of failure) of a material by plotting the mean stress against the alternating stress. Among them, polyetheretherketone (PEEK) has gained wide interest in load-bearing applications due to its yielding behaviour and its superior corrosion resistance. Herein this approach has been extended to the fatigue behaviour of PEEK, with satisfactory results. The Effect of Resin on the Impact Damage Tolerance of Graphite Epoxy Laminates, ASTM STP 787, Composite Materials: Testing and Design (Sixth Conference pp. PEEK has the best fatigue resistance of any resin, and the combination of excellent mechanical strength properties and fatigue resistance is the most outstanding of all plastics, with performance not inferior to that of some alloys with hence the mechanical properties. A constant fatigue life (CFL) diagram 4 is usually used to the study the effect of R in the fatigue life of a material. 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |