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Journal of Composite Materials
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Free-edge Stress Singularities and Edge Modifications for Fiber Pushout Experiments

L. Roy Xu

Department of Civil and Environmental Engineering & Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN 37235, USAl.roy.xu{at}vanderbilt.edu

Huacheng Kuai

Sreeparna Sengupta

Department of Civil and Environmental Engineering & Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN 37235, USA

A comprehensive investigation of the fiber pushout test reveals that the existence of free-edge stress singularities hinder the accurate measurement of interfacial shear strengths. An integrated analytical, numerical, and experimental investigation is conducted to remove the free-edge stress singularities by modifying the edge design in a model fiber pushout test. The proposed interfacial joint angles are applicable to most composite material systems. The microdroplet test is recommended over the fiber pushout test since the convex shape of the microdroplet matrix makes it a natural choice.

Key Words: adhesion • fiber pushout • interfacial strength • stress singularity • microdroplet test

Journal of Composite Materials, Vol. 39, No. 12, 1103-1125 (2005)
DOI: 10.1177/0021998305048742
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