Research Article Numerical Simulation of Mixed-Mode Fatigue Crack Growth for Compact Tension Shear Specimen Yahya Ali Fageehi and Abdulnaser M. Alshoaibi Department of Mechanical Engineering, Jazan University, P. O. Box 706, Jazan 45142, Saudi Arabia Correspondence should be addressed to Abdulnaser M. Alshoaibi; alshoaibi@gmail.com Received 30 January 2020; Revised 3 March 2020; Accepted 20 March 2020; Published 23 April 2020 Academic Editor: Davide Palumbo Copyright © 2020 Yahya Ali Fageehi and Abdulnaser M. Alshoaibi. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. is work concentrates on the fracture behaviour of the compact tension specimen under mixed-mode loading, and numerical investigation using ANSYS Mechanical APDL 19.2 finite element program with different modes of mix angles is carried out. e prediction of mixed-mode fatigue life under constant amplitude fatigue loading for the compact tension shear specimen (CTS) is employed using Paris’ law model for two different loading angles with agreement to the experimental results. e predicted values of ΔK eq were compared with the experimental and analytical data for various models. Depending on the analysis, the findings of the present study show consistency with the results achieved with similar models of predicting the equivalent stress intensity factor. In addition, the direction of crack growth derived from the analysis was observed to follow the same trend of the literature experimental results. 1. Introduction is work describes the use of ANSYS Mechanical APDL 19.2 finite element program in crack analysis of the engi- neering structures containing discontinuities and holes. In the proposed study of the cracks throughout elastic mate- rials, linear elastic fracture mechanics are employed where the crack driving force called stress intensity factor (SIF) is used as a measure of fracture associated with the materials threshold SIFs (K th ) for dynamic loading. e accuracy of a crack propagation simulation depends highly on the accu- racy achieved for the calculated SIFs. Engineering structures are generally used under periodic and cyclic loading con- ditions [1] [2–7] [6]. e periodic as well as cyclic loading decreases the load limit required to initiate deformation in the material under static loading and results in progressive fracture leading to catastrophic failures of the material known as fatigue failures [6]. It has been estimated that 60% to 80% of the failures of mechanical components are as- sociated with fatigue [8]. Various problems concerning fatigue crack growth can be found in the literature using different approaches for simple and complex geometries in two and three dimensions [9–13]. Combined action of tensile stress, cyclic stress, and plastic strain initiates failure due to fatigue phenomena. If any of these three does not exist, it will not trigger and spread a fatigue crack growth [14]. As environmental loads are also multidirectional in nature, the fatigue cracks may propagate under mixed-mode conditions [15–18]. e majority of failures in service is of mixed-mode type, where the cracks do not propagate in the direction normal to the applied load. However, the majority of fatigue crack growth behavior studies focus on mode I cracks, whereas the cracks and defects in actual engineering components (e.g., pressure vessels, pipelines, and fan blades) tend to be plane-stress mixed-modes I–II cracks [19]. In reality also mixed mode can be observed, for example, in turbine shafts or railway tracks by a sudden change of the loading direction. e crack will initiate due to the plastic strain occasioning from the cyclic stress, whereas the propagation steps of the cracks result from the tensile stress. Furthermore, the cause of local tensile stresses happens to be the fact that compressive loads may not lead to the initiation of fatigue crack [20]. To prevent failure due to fatigue, ex- tensive research has been performed to get developed and Hindawi Advances in Materials Science and Engineering Volume 2020, Article ID 5426831, 14 pages https://doi.org/10.1155/2020/5426831