![]() ![]() Results show that the employed model is applicable to capture microstructural effects on fatigue behavior of PEEK.įatigue life estimation Fatigue modeling Polyether ether ketone (PEEK) Strain-life approach Structure–property relations Thermoplastics.Ĭopyright © 2015 Elsevier Ltd. Based on the experimental strain-life results and the observed microstructure of fatigue specimens, a microstructure-sensitive fatigue model was used to predict the fatigue life of PEEK that includes both crack incubation and small crack growth regimes. Polytheretherketone (PEEK) belongs to the high-temperature engineering thermoplastics which have become particularly attractive as a matrix material of advanced. On the other hand, Beguelin et al (1991) reported mode I results of a PEEK matrix carbon composites only a small reduction in the value of K IC as the test rate was similarly increased. The rapid evolution of computer-aided design and computer-aided manufacturing (CAD-CAM) technology led to the introduction of new materials that could be precisely milled for the fabrication of dental prostheses. SEM analysis was also conducted on the fracture surface of fatigue specimens to observe microstructural inclusions that served as the crack incubation sites. epoxy as well as for thermoplastic polyether etherketone (PEEK) composites, as the test rate was increased from a few mm/min to about 1m/s. The microstructure of PEEK was obtained using the optical and the scanning electron microscope (SEM) to determine the microstructural inclusion properties in PEEK specimen such as inclusion size, type, and nearest neighbor distance. Why PEEK Excellent fatigue, stress-crack, and creep resistance Very low moisture absorption Remarkable inertness Excellent electrical properties Radiation. To obtain the cyclic behavior of PEEK, uniaxial fully-reversed strain-controlled fatigue tests were conducted at ambient temperature and at 0.02 mm/mm to 0.04 mm/mm strain amplitudes. Due to the versatility of its material properties, the semi-crystralline PEEK polymer has been increasingly adopted in a wide range of applications particularly as a biomaterial for orthopedic, trauma, and spinal implants. For small strains, this strain is proportional 20 2 to the stress and calculable from the appropriate modulus. 40 6 When a material is subjected to stress, an immediate 4 strain occurs. In this study, the effects of microstructural inclusions on fatigue life of polyether ether ketone (PEEK) was investigated. 8 application of stress is cyclical, then fatigue must also be considered. With increasing alignment of the fibres along the loading axis, a noticeable improvement of fatigue strength could be observed, whereas when the fibres were mostly perpendicular, fatigue properties were even lower than those of unreinforced PEEK.
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