Parameters of fracture mechanics under combined loading by normal separation and in-plane shear

The methods of separable functions and finite elements have been used to generate design formulas of the J-integral for a tensing plate made of material reinforced by a deformation with a centrally inclined through crack. The crack angle allows for a variation of the loading conditions from normal separation up to the combined loading by normal separation and in-plane shear. The correcting coefficients η pl and η pl COD that enter into the formulas of the J integral depend on the relation between normal separation and in-plane shear parameters and on the deformation reinforcement factor. At the same time, the normalized correcting coefficients η pl (θ)/η pl(θ = 0) are practically independent of the sample geometry. © Allerton Press, Inc. 2009.