13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- Figure 1. Central crack in a finite homogeneous strip Numerical results for the phonon displacement 2u along the crack-face for various coupling parameter R are given in Fig. 2. For a vanishing coupling parameter R/M = 0, we obtain phonon displacements corresponding to conventional elasticity. One can observe a good agreement between the FEM and present MLPG results. The FEM results have been obtained by the COMSOL code with 576 quadrilateral elements. One can observe that the phonon crack-opening-displacements increase with increasing value of the coupling parameter. The stress intensity factor (SIF) is computed by using equation (25) and the extrapolation technique from stresses ahead of the crack-tip with finite distances. The normalized SIF 0 / IK a σ π P is increasing from 1.139 at R/M=0 to 1.323 at R/M=0.5. Figure 2. Variations of the phonon crack displacement with the normalized coordinate 1 /2 x a
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