Determination of Interfacial Shear and Normal Stresses in Fiber Pull-Out

by Vistasp M. Karbhari, Univ of Delaware, Newark, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract: In this paper we present an improved formulation for the pullout problem, wherein both the effects of fiber end condition and interfacial and frictional shear stresses are considered. The externally applied stress required to cause catastrophic pullout is determined as a function of various parameters including the ratio of interfacial shear strength to the interfacial frictional stress. The effects of fibril bundles is also investigated. A comparison is made between the stress needed to cause intermediate non catastrophic debonding with that needed for catastrophic debonding and subsequent pullout. The main aim of this investigation is to develop a sufficient understanding of interfacial phenomena so as to be able to design and control damage mechanisms in composites.

Subject Headings: Shear stress | Pullout behavior | Friction | Shear strength | Disasters | Composite materials | Fabrics | Bonding

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