Initially, the I-shape specimen is examined to show the accuracy of the crack pattern, the role of a q parameter, and the load-carrying capacity of the specimen. In the next step, the single edge tension test is used to evaluate the effect of the loading angle and role of the n parameter in combination with the proposed q parameter.
Finally, double notched specimens and a compact tension specimen were studied to evaluate the robustness of the proposed model. In this process, the crack trajectory, role of length scale, and strain threshold on the load-displacement behavior were tested. All numerical computations are performed within the finite element framework using fully integrated 8-node quadrilateral elements and assuming plain strain conditions, with the material properties as mentioned before. Displacement controlled conditions are always assumed. Moreover, all of the simulations are performed on an Intel® Xeon® CPU E5-2690 v4 @ 2.60 GHz with 24 GB RAM memory. The calibration parameters are described as follows.
Table . Calibration Parameters