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Published April 2005 | public
Journal Article Open

Frictional sliding modes along an interface between identical elastic plates subject to shear impact loading

Abstract

Frictional sliding along an interface between two identical isotropic elastic plates under impact shear loading is investigated experimentally and numerically. The plates are held together by a compressive stress and one plate is subject to edge impact near the interface. The experiments exhibit both a crack-like and a pulse-like mode of sliding. Plane stress finite element calculations modeling the experimental configuration are carried out, with the interface characterized by a rate and state dependent frictional law. A variety of sliding modes are obtained in the calculations depending on the impact velocity, the initial compressive stress and the values of interface variables. For low values of the initial compressive stress and impact velocity, sliding occurs in a crack-like mode. For higher values of the initial compressive stress and/or impact velocity, sliding takes place in a pulse-like mode. One pulse-like mode involves well-separated pulses with the pulse amplitude increasing with propagation distance. Another pulse-like mode involves a pulse train of essentially constant amplitude. The propagation speed of the leading pulse (or of the tip of the crack-like sliding region) is near the longitudinal wave speed and never less than √2 times the shear wave speed. Supersonic trailing pulses are seen both experimentally and computationally. The trends in the calculations are compared with those seen in the experiments.

Additional Information

© 2004 Elsevier Ltd. Received 18 May 2004; received in revised form 5 November 2004; accepted 6 November 2004. DC and AN are pleased to acknowledge support from the Office of Naval Research through Grant N00014-97-1-0179 and from the General Motors Cooperative Research Laboratory at Brown University. GL and AJR are grateful for support from the Office of Naval Research through Grant N00014-02-1-0522. We are indebted to Professor J.R. Rice of Harvard University and to Professors K.S. Kim and T.E. Tullis of Brown University for stimulating comments and insightful suggestions during the course of this work.

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