Abstract
The assessment of the failure behavior of a material is one of the fundamental needs of engineering. Components can fail for a variety of reasons, and failure by fracture, often emanating from a stress concentration, be it in cyclic or static loading, can be one of the most catastrophic. For neat PEEK, it has been shown that intrinsic factors, such as molecular weight, percent crystallinity, spherulite size, and aging, as well as a variety of extrinsic factors, affect the fracture and fatigue properties of PEEK. Fracture in low-molecular-weight PEEK (150G) is an intraspherulitic process, whereas fracture in high-molecular-weight PEEK (450G) is an interspherulitic process. Under monotonic loading conditions and in the presence of a notch, PEEK is a notch-weakening material in which notching suppresses gross deformation of the specimen and, as a consequence, alters the micromechanism of fracture. The fracture behavior of neat PEEK under monotonic and cyclic loading conditions and in the presence of stress concentrations has been considered.
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