Compression fatigue failure of CFRP laminates with impact damage

Nobuhide Uda; Kousei Ono; Kazuo Kunoo

doi:10.1016/j.compscitech.2008.11.031

Compression fatigue failure of CFRP laminates with impact damage

Nobuhide Uda, Kousei Ono, Kazuo Kunoo

Aerospace Structures and Structural Dynamics Laboratory

Research output: Contribution to journal › Article

43 Citations (Scopus)

Abstract

The objective of this study is to investigate failure mechanisms of impact-damaged CFRP laminates subjected to compression fatigue. Two kinds of composite materials, UT500/Epoxy and AS4/PEEK, were used to examine the dependence of failure behavior on the material properties such as interlaminar toughness. Impact-induced delaminations in the UT500/Epoxy specimen were considerably larger than those in the AS4/PEEK specimen. The S-N curves for the UT500/Epoxy specimens with impact damage exhibited a similar tendency to those without impact. The impact-induced delamination in the UT500/Epoxy specimen grew widthwise to the free edge on the rear side of the specimen during the fatigue test. On the other hand, the AS4/PEEK specimens without impact exhibited a more steeply declining S-N curve than those with impact damage. The delaminations in the impacted AS4/PEEK specimen did not reach the free edge before the fatigue fracture.

Original language	English
Pages (from-to)	2308-2314
Number of pages	7
Journal	Composites Science and Technology
Volume	69
Issue number	14
DOIs	https://doi.org/10.1016/j.compscitech.2008.11.031
Publication status	Published - Nov 1 2009

All Science Journal Classification (ASJC) codes

Engineering(all)
Ceramics and Composites

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Uda, N., Ono, K., & Kunoo, K. (2009). Compression fatigue failure of CFRP laminates with impact damage. Composites Science and Technology, 69(14), 2308-2314. https://doi.org/10.1016/j.compscitech.2008.11.031

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abstract = "The objective of this study is to investigate failure mechanisms of impact-damaged CFRP laminates subjected to compression fatigue. Two kinds of composite materials, UT500/Epoxy and AS4/PEEK, were used to examine the dependence of failure behavior on the material properties such as interlaminar toughness. Impact-induced delaminations in the UT500/Epoxy specimen were considerably larger than those in the AS4/PEEK specimen. The S-N curves for the UT500/Epoxy specimens with impact damage exhibited a similar tendency to those without impact. The impact-induced delamination in the UT500/Epoxy specimen grew widthwise to the free edge on the rear side of the specimen during the fatigue test. On the other hand, the AS4/PEEK specimens without impact exhibited a more steeply declining S-N curve than those with impact damage. The delaminations in the impacted AS4/PEEK specimen did not reach the free edge before the fatigue fracture.",

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