Thermal damage effects on mode II interlaminar fatigue crack propagation of graphite/epoxy composites

Jiun Ren Hwang, An Shyh Lee

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Abstract

The relative change in mode II interlaminar crack propagation performance of graphite/epoxy specimens was determined as a function of isothermal overheating up to 300°C. Various periods up to 30 min were chosen to simulate a fire-extinguishing procedure. End-notched flexure (ENF) specimens of 24-ply unidirectional graphite/epoxy laminates with a starter film, Teflon, introduced at the mid-thickness of the laminate were prepared. The mode II cyclic delamination growth rate and interlaminar shear strength were determined. The mode II strain energy release rate was calculated from load-displacement results. The interlaminar shear strength change in the response of thermal damage was determined according to ASTM D2344 standard. Fracture surfaces were also examined using a SEM in order to identify the microfailure modes and clarify the mechanisms of degradation.

Original languageEnglish
Pages (from-to)389-393
Number of pages5
JournalComposite Structures
Volume27
Issue number4
DOIs
StatePublished - 1994

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