Journal
COMPOSITES PART B-ENGINEERING
Volume 250, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2022.110455
Keywords
Polymer-matrix composites (PMCs); Mechanical properties; Fracture; Damage mechanics; Temperature dependency
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This study investigates the tensile failure behaviors of PEEK, short carbon, and glass-fiber-reinforced PEEK composites at different temperatures and strain rates. Quasi-static and dynamic tensile tests are conducted, and the fracture morphology is characterized by scanning electron microscopy. The results show that the tensile strength is highly influenced by temperature and strain rate. The failure strain of the composites is less sensitive to strain rate at -30 degrees C and 100 degrees C. Additionally, the energy absorptivity of PEEK composites decreases at extreme temperatures.
This work presents an experimental investigation of the tensile failure behaviors of polyetheretherketone (PEEK), short carbon, and glass-fiber-reinforced PEEK composites at-30-100 degrees C and various strain rates (10- 3-103 s-1). Quasi-static and dynamic tensile tests are conducted, and fracture morphology is characterized by performing scanning electron microscopy to reveal the mechanical properties and failure mechanisms of PEEK and its composites at different temperatures and strain rates. The results indicate that the tensile strength is highly sensitive to temperature and strain rate. At-30 degrees C and 100 degrees C, the strain rate sensitivity of the failure strain of the two composites is significantly reduced. In addition, compared with that at 25 degrees C, the energy absorptivity of PEEK composites decreases at high or low temperatures. Moreover, the primary failure mechanisms of the PEEK composites are interfacial debonding and fiber pull-out at high temperatures and fiber fracture at low temperatures.
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