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Journal of Thermoplastic Composite Materials
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Analysis of Fiber/Matrix Interface in Unidirectional Fiber-Reinforced Composites

Wen S. Chan

Center for Composite Materials, Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA, chan{at}mae.uta.edu

Lee Ann Johnson

Center for Composite Materials, Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA

Finite element models are used to analyze a quarter of unit cell for a unidirectional lamina. Effective lamina properties obtained from a micromechanics model were used to compare with the FEM results. Stresses at the fiber/matrix interface are determined for longitudinal and transverse tension load and combined tension and thermal load. Strain energy release rates are calculated for various degrees of fiber/matrix debonding under tension, transverse, thermal and their combined loading conditions. Variations of strain energy release rates along the interface indicate that completely debonding along the fiber/matrix interface of the circumference of the fiber is unlikely. Finally, the loss in stiffness due to the aforementioned load cases is predicted.

Journal of Thermoplastic Composite Materials, Vol. 15, No. 5, 389-402 (2002)
DOI: 10.1177/0892705702015005733
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[Abstract] [PDF]