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Journal of Composite Materials
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Stress Transfer Model for Single Fibre and Platelet Composites

D. A. Mendels

Laboratoire de Technologie des Composites et Polymeres (LTC), Ecole Polytechnique Fgderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

Y. Leterrier

Laboratoire de Technologie des Composites et Polymeres (LTC), Ecole Polytechnique Fgderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

J. A. E. Manson

Laboratoire de Technologie des Composites et Polymeres (LTC), Ecole Polytechnique Fgderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

A model for elastic stress transfer across the interface in composites has been developed in particular to overcome the known problem of the matrix effective radius. Stresses were determined using a two dimensional method by introducing a novel hypothesis of structural response of the matrix. This is in contrast to previous approaches, which mainly consider that the axial derivative of axial stress does not depend upon the radius. This leads to a new form of the stress transfer equation, free of an adjustable parameter. This analysis was applied to linear elastic single fibre and single platelet composites. The comparison of the two reinforcements allowed the identification of a structural parameter for which the two geometries are shown to be equivalent. The model was validated using literature results obtained by Raman spectroscopy means or photo-elastic methods. The agreement between measured data and the model showed the relevance of the matrix structural response approach to stress transfer.

Key Words: stress transfer • single fibre • single platelet • mechanical properties • structural response • interface

Journal of Composite Materials, Vol. 33, No. 16, 1525-1543 (1999)
DOI: 10.1177/002199839903301604
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