INPLANE PROBLEM OF DIFFRACTION OF ELASTIC-WAVES BY A PERIODIC ARRAY OF COPLANAR GRIFFITH CRACKS

This paper represents the analysis of the problem of diffraction of lo ngitudinal waves by a series of periodically spaced coplanar Griffith cracks in an infinite, isotropic elastic medium. Due to the periodicit y of the geometry, the problem with a single crack in a strip with bou ndaries such that shear stress and normal displacement are zero on the m. On use of Fourier transform the mixed boundary value problem for a typical strip has been reduced firstly to the solution of dual integra l equations and finally to that of a Fredholm integral equation of the second kind. Numerical values of stress intensity factor and the crac k opening displacement have been plotted graphically.