Fig.8 The effect of \(\mathbf{q}\) parameter on the stability of crack propagation a) \(\mathbf{q}\mathbf{=1}\) , b) \(\mathbf{q}\mathbf{=0.8}\) , c)\(\mathbf{q}\mathbf{=0.5}\)
The global aspect of the load-displacement curve is similar to that obtained with the previous investigations.15,53However, it should be noted that the general fracture process is quite different for the highest values of the hardening module. From the force-displacement curve, unlike Ambati et al , the initiation of the failure in the present material is not quite abrupt, Fig.9.