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Fracture Mechanics of Interfaces

Published online by Cambridge University Press:  21 February 2011

Surendra P. Shah  and
Yeou-Shang Jenq
Surendra P. Shah
Affiliation:
Northwestern University, Department of Civil Engineering, Director, Center of Concrete and Geomaterials, Evanston, IL 60201
Yeou-Shang Jenq
Affiliation:
The Ohio State University, Department of Civil Engineering, Columbus, Ohio 43210
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Abstract

Interfacial bond properties between fibers and matrix are investigated in the present paper. A fiber pull-out test, which is commonly used to study the interfacial bond strength of fiber-matrix system, is analyzed. The bonding between fibers and matrix is assumed to be perfect before the pull-out load is applied. Griffith energy criterion is used to govern the crack propagation at the interfacial region when debonding begins. A constant frictional shear stress, which may be a result of existence of surface roughness at the interface, is assumed to exist at the wake of debonding region. Based on this mechanism, the total pull-out load can be decomposed as: resistance offered by the interfacial bond and resistance offered by the frictional stress. The proposed approach is applicable to any elastic fiber and matrix system, but only the results of steel fibers and reinforcing bar in a cementitious matrix are reported. The proposed model correctly predicts several experimental trends of bond strengths reported by other researchers. Furthermore, theoretical predictions of progressive failure of bond cracks are found to be in good agreement with a holographic interferometry study on a pull-out test.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 114: Symposium R – Bonding in Cementitious Composites , 1987 , 205
Copyright
Copyright © Materials Research Society 1988

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References

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