Abstract
Polyetheretherketone (PEEK) is of great interest to the biomedical industry especially for trauma, orthopedic and spinal implants. It is biocompatible and offers numerous advantages over other metallic biomedical implants. A good understanding of behavior of PEEK under different loading conditions is therefore necessary for its more efficient use. This paper investigates the notch sensitivity of PEEK in monotonic tension using the finite element modeling in ABAQUS. An unnotched specimen and three notched specimens (moderate, deep and razor) are modeled and the maximum true stress in each case is obtained. The stress distribution in front of the crack tip is also found by introducing a crack in the model for each specimen. It is observed that PEEK exhibits a ductile behavior in the absence of a stress concentration. The deformation mechanism is found to be dramatically changed from ductile to brittle in the presence of notches. Hence, the locations and severity of stress risers modeled as notches in PEEK should be taken into consideration prior to its use in biomedical implants.
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