Direct observations of debonding in fiber pull-out specimens

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:536323

Piggott, M R; Xiong, Y ^[1]

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1. 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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
EPOXIDES
EXPERIMENTAL DATA
FAILURES
FRACTURE MECHANICS
FRACTURE PROPERTIES
GLASS
INTERFACES
REINFORCED MATERIALS
SHEAR PROPERTIES