Influence on fiber inclination and interfacial conditions on fracture in composite materials |
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Authors: | S K Khanna A Shukla |
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Affiliation: | (1) Department of Mechanical Engineering, Texas A&M University, 77843-3123 College Station, TX;(2) Department of Mechanical Engineering, University of Rhode Island, 02881 Kingston, RI |
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Abstract: | Dynamic photoelasticity has been used to study the effect of the fiber-matrix interface and fiber orientation on dynamic crack growth in fiber composites. Two types of fiber-matrix interfaces are considered: well bonded and partly debonded. The fiber-matrix interface is characterized by conducting fiber pullout tests. Partly debonded fibers aligned with the loading direction, result in higher fiber debonded lengths, lower dynamic stress-intensity factorK
ID and lower fracture surface roughness compared to well bonded fibers. Orientation of brittle fibers, with respect to the loading direction, impairs their ability to lowerK
ID
, while oriented ductile fibers produce no significant change inK
ID
. Misalignment of fibers from the loading direction reduces the fiber debonded length due to kinding of the fiber at the crack face. |
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