Abstract
We consider the problem of determining the stress intensity factors and the crack energy in an infinitely long elastic strip containing two coplanar Griffith cracks. We assume that the strip is bonded to semi-infinite elastic planes on either side and that the cracks are opened by constant internal pressure. By the use of Fourier transforms we reduce the problem to solving a set of triple integral equations withcosine kernel and a weight function. These equations are solved using Finite Hilbert transform techniques. Analytical expressions upto the order off δ −10 where 2δ denotes the thickness of the strip and δ is much greater than 1 are derived for the stress intensity factors and the crack energy.
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