Interface Behavior in Steel Fiber/Cement Composites under Tension
Publication: Journal of Engineering Mechanics
Volume 124, Issue 9
Abstract
The fundamental properties of fiber-matrix interface are commonly determined by analyzing fiber pullout tests. Recognition of the dependence of the interface properties on the explanation of the pullout force-displacement curve has motivated a recent study on using special techniques to directly measure parameters relating to interface properties. In this paper, laser Moire interferometry was employed to study interface shear stress and interface energy release rate in continuous steel fiber-reinforced cementitious composites under tension in order to evaluate the fiber-matrix interface response, which was primarily acquired from fiber pullout tests. It was observed that the maximum interface shear stress in the debonded zone was independent of fiber volume fraction, fiber diameter, and applied tensile load. The interface frictional shear stress decreased with increasing slip. The interface strain energy release rate measured using the continuous fibers was larger than those obtained from short fiber pullout tests. The values of the interface energy release were dependent on fiber volume fraction and diameter. This dependency can be well described by an R-curve approach.
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Information
Published In
Journal of Engineering Mechanics
Volume 124 • Issue 9 • September 1998
Pages: 1037 - 1044
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Sep 1, 1998
Published in print: Sep 1998
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