PSI - Issue 21

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 21 (2019) 38–45

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers Abstract In this study, main results from parametric analyses of three-dimensional inclined elliptical surface cracks using FRAC3D are presented in terms of normalized mixed mode stress intensity factors (SIFs) along crack fronts. FRAC3D is the solver of in-house developed “Fracture and Crack Propagation Analysis System (FCPAS)” and is a finite element -based standalone program employing three-dimensional enriched finite elements. In the analyses, values of the main parameters affecting the problem, which are normalized crack depth with respect to plate thickness ( a/t =0.2, 0.4, 0.6, 0.8), crack aspect ratio ( a/c =0.25, 0.50, 1.0, 2.0, 4.0) and crack inclination angle ( β =0°, 15°, 30°, 45°, 60°, 75°), are changed systematically in their realistic ranges to obtain a wide library of solutions representing the general problem and to develop empirical SIF equations that are valid for all values of the main parameters in their pre-determined ranges. This resulted in a total of 120 three-dimensional fracture analyses. The results show that as the inclination angle of the surface crack increases, mode-I SIF decreases along the crack front, while mode-II and mode-III SIFs increase up to β =45°, which contains the plane with maximum in-plane shear stress. For higher values of β , mode-II and mode-III SIFs start decreasing as expected. As the normalized crack depth increases, the normalized SIFs also increase. When the depth point and the free-surface point are compared with each other, it is seen that the crack aspect ratio also has big effect on the relative values of the normalized SIFs. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials Three-Dimensional Mixed Mode Stress Intensity Factors for Inclined Elliptical Surface Cracks in Plates under Uniform Tensile Load Hakan Şahin a , Ali O. Ayhan ɑ ,* a Department of Mechanical Engineering, Sakarya University, Sakarya 54050, Turkey Abstract In this study, main results from parametric analyses of three-dimensional inclined elliptical surface cracks using FRAC3D ar presented in terms of normalized mixed mode stress intensity factors (SIFs) along crack fronts. FRAC3D is the solver of in-house developed “Fracture and Crack Propagation Analysis System (FCPAS)” and is a finite element -based standalone program empl ying three-dimensional enriched finite elements. In the analyses, values of the main parameters ffecting the problem, which re normalized crack depth with respect to plate thickness ( a/t =0.2, 0.4, 0.6, 0.8), crack aspect ratio ( a/c =0.25, 0.50, 1.0, 2.0, 4.0) and crack inclination angle ( β =0°, 15°, 30°, 45°, 60°, 75°), ar changed systematically in t eir r alistic ranges to obtain a wide library of solutions representing the gen ral problem and to develop empirical SIF equations that are valid for all values of the main parameters in their pre-determined ranges. This resulted in a total of 120 thre -dimensional fracture analyses. The results sh w that as the inclination angle of the surface crack incre s s, mode-I SIF decreases along the crack front, while mode-II and mode-III SIFs increase up to β =45°, which contains the plane with maximum in-plane sh ar stress. For higher values of β , mode-II and mode-III SIFs start decreasing as expect d. As the normalized crack depth increases, the normalized SIFs also increase. Whe t depth point and the free-surface point are compared with each other, it is seen that the crack aspect ratio also has big effect on the relative values of the normalized SIFs. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials Three-Dimensional Mixed Mode Stress Intensity Factors for Inclined Elliptical Surface Cracks in Plates under Uniform Tensile Load Hakan Şahin a , Ali O. Ayhan ɑ ,* a Department of Mechanical Engineering, Sakarya University, Sakarya 54050, Turkey

* Corresponding author. Tel.: +9-0264-2955656. E-mail address: ayhan@sakarya.edu.tr * Correspon ing aut or. Tel.: +9-0264-2955656. E-mail address: ayhan@sakarya.edu.tr

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND l cense (http://creativecommons.org/licens s/by-nc-nd/4.0/ Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers 10.1016/j.prostr.2019.12.084