Time and temperature dependence of carbon/epoxy interface strength

Characterization of fiber/matrix interface is essential for the understanding of long-term properties of fiber reinforced composite materials. In this research, time and temperature dependence of carbon/epoxy interface strength were investigated. Unidirectional specimens were tested under tensile lo...

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Bibliographic Details
Published in:	Composites science and technology Vol. 70; no. 9; pp. 1395 - 1400
Main Authors:	Koyanagi, Jun, Yoneyama, Satoru, Nemoto, Ayumu, Melo, Jose Daniel D.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-09-2010 Elsevier
Subjects:	A. Polymer–matrix composites (PMCs) Applied sciences B. Interfacial strength C. Finite element analysis (FEA) Carbon Carbon-epoxy composites Critical point D. Fractography Exact sciences and technology Failure Failure modes Forms of application and semi-finished materials Laminates Polymer industry, paints, wood Strength Stresses Technology of polymers Temperature dependence Time and temperature dependence B. Interfacial strength A. Polymer–matrix composites (PMCs) Time and temperature dependence C. Finite element analysis (FEA) D. Fractography Thermal stress Laminate Mechanical model Unidirectional fiber material Fiber reinforced material Epoxy resin Mechanical properties Tensile property Experimental study Mineral fiber Modeling Composite material Finite element method A. Polymer-matrix composites (PMCs) Interface properties Matrix fiber interface Residual stress Fracture mode Temperature time superposition Carbon fiber
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Summary:	Characterization of fiber/matrix interface is essential for the understanding of long-term properties of fiber reinforced composite materials. In this research, time and temperature dependence of carbon/epoxy interface strength were investigated. Unidirectional specimens were tested under tensile load up to failure, at various temperatures and testing speeds. The failure modes were identified as matrix dominant failure or interface dominant failure. A unit-cell model was considered to evaluate the stresses at the microscopic level and identify the critical points of highest stresses. Time and temperature dependent stress-concentration factor and thermal residual stress at the critical points were calculated using viscoelastic FEA. The micro stresses at the critical points were found to be properly represented by a bilinear curve with the interface dominant failure mode associated with the horizontal portion of the curve, suggesting that the interface strength is independent of time and temperature.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0266-3538 1879-1050
DOI:	10.1016/j.compscitech.2010.04.019