Scattering of Plane Waves by a Propagating Crack

[+] Author and Article Information
E. P. Chen, G. C. Sih

Institute of Fracture and Solid Mechanics, Lehigh University, Bethlehem, Pa.

J. Appl. Mech 42(3), 705-711 (Sep 01, 1975) (7 pages) doi:10.1115/1.3423666 History: Received November 01, 1974; Revised March 01, 1975; Online July 12, 2010


Scattering of plane harmonic waves by a running crack of finite length is investigated. Fourier transforms were used to formulate the mixed boundary-value problem which reduces to pairs of dual integral equations. These dual integral equations are further reduced to a pair of Fredholm integral equations of the second kind. The dynamic stress-intensity factors and crack opening displacements are obtained as functions of the incident wavelength, angle of incidence, Poisson’s ratio of the elastic solid and speed of crack propagation. Unlike the semi-infinite running crack problem, which does not have a static limit, the solution for the finite crack problem can be used to compare with its static counterpart, thus showing the effect of dynamic amplification.

Copyright © 1975 by ASME
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