SYMPOSIA PAPER Published: 01 January 1996

Direct Observation of Debonding in Fiber Pull-Out Specimens


Single-fiber pull-out experiments under the microscope were compared with results from Instron pull-out experiments using the same glass fiber-room-temperature-cured epoxy system. It was found that when the loading system was stiff the pull-out curve obtained with the Instron had a transition which could be identified with the initiation of debonding, as seen under the microscope. Under these conditions debonding appeared to be a controlled fracture process. The work of fracture was about 70 ± 20 Jm-2, and was governed by an equivalent debonding shear stress of 44 ± 8 MPa. The yielding process was initiated at a shear stress of 25 ± 6 MPa. These results could be obtained using a very simple analysis because they were not affected by friction.

Author Information

Piggott, MR
University of Toronto, Toronto, Canada
Xiong, Y
University of Toronto, Toronto, Canada
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Developed by Committee: D30
Pages: 84–91
DOI: 10.1520/STP38227S
ISBN-EB: 978-0-8031-5564-0
ISBN-13: 978-0-8031-2046-4