Effect of Fiber Rupture on Tensile Properties of Short Fiber Composites
Publication: Journal of Engineering Mechanics
Volume 121, Issue 8
Abstract
A probabilistic-based micromechanical model has been developed for the postcracking behavior of a brittle matrix reinforced with short, randomly distributed fibers. The model that predicts the composite-bridging stress crack-opening displacement (COD) relationship, accounts for fiber pullout, fiber tensile rupture, and a local frictional effect called snubbing. However, it does not account for fiber bending rupture, and the possible effect of matrix spalling at the exit points of inclined fibers from the matrix. The model assumes a fiber/matrix interface that is controlled by a constant frictional bond stress. The model is used to predict the composite tensile strength and fracture energy. Comparisons of model-predicted bridging stress-COD relationship with experimental data, where fiber rupture has occurred, show reasonable agreement supporting the validity of the proposed model. The model is then used to perform a parametric study to evaluate the effect of the micromechanical parameters on the composite tensile strength and fracture energy. The study suggests that this model can be used to design the composite for optimum performance.
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Information
Published In
Journal of Engineering Mechanics
Volume 121 • Issue 8 • August 1995
Pages: 903 - 913
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Aug 1, 1995
Published in print: Aug 1995
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