Direct observations of debonding in fiber pull-out specimens
- Univ. of Toronto, Ontario (Canada). Dept. of Chemical Engineering and Applied Chemistry
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{sup {minus}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.
- Sponsoring Organization:
- Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
- OSTI ID:
- 536323
- Report Number(s):
- CONF-9411343-; ISBN 0-8031-2046-X; TRN: IM9745%%162
- Resource Relation:
- Conference: Symposium on fiber, matrix, and interface properties, Phoenix, AZ (United States), 14 Nov 1994; Other Information: PBD: 1996; Related Information: Is Part Of Fiber, matrix, and interface properties; Spragg, C.J.; Drzal, L.T. [eds.]; PB: 206 p.; ASTM special technical publication, 1290
- Country of Publication:
- United States
- Language:
- English
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