PSI - Issue 28

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

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Procedia Structural Integrity 28 (2020) 1140–1147

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract A new test configur tion called Hol d-Cracked S r Plate (HCSP) is proposed to investigate mixed mode I/II fracture of bri tl and quasi-brittle materials. T is specimen is a square plate containing a centr l hole and two rad al cracks initiated from the ci cumferen e of the internal hole. The finite eleme t thod was u ed to calcul te mode I, mode II intensity factors and T-stress for vari us crack l ngths and hole diameters. The numerical results sh w that a full range of fracture mode mixities from pu e mode I to pur mode II can b realized by ch n ing the or entati n angle of two radial cracks in this specimen. The simple geometry and loading set up of this specimen make it a good substitute for other fracture tests. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under t CC BY-NC-ND license (https:// r ativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 1st Virtual European Conference on Fracture A new specimen for mixed mode I/II fracture of brittle and quasi brittle materials Yifan Li*, Martyn J. Pavier, Harry Coules Department of Mechanical Engineering, University of Bristol, Queens Building, University Walk, Bristol BS8 1TR, UK Abstract A new test configuration called Holed-Cracked Square Plate (HCSP) is proposed to investigate mixed mode I/II fracture of brittle and quasi-brittle materials. This specimen is a square plate containing a central hole and two radial cracks initiated from the circumference of the internal hole. The finite element method was used to calculate mode I, mode II intensity factors and T-stress for various crack lengths and hole diameters. The numerical results show that a full range of fracture mode mixities from pure mode I to pure mode II can be realized by changing the orientation angle of two radial cracks in this specimen. The simple geometry and loading set up of this specimen make it a good substitute for other fracture tests. 1st Virtual European Conference on Fracture A new specimen for mixed mode I/II fracture of brittle and quasi brittle materials Yifan Li*, Martyn J. Pavier, Harry Coules Department of Mechanical Engineering, University of Bristol, Queens Building, University Walk, Bristol BS8 1TR, UK 1. Introduction Rock masses and rock structures with pre-existing cracks and flaws are often subjected to a complex geo mechanical environment. Hence, mixed mode fracture is the most common type of mechanical failure of rock materials. Study of the mechanism of mixed mode fracture of rocks and the measurement of fracture toughness is of great significance in engineering applications. Different types of specimens have been proposed and employed by 1. Introduction Rock masses a d rock structures with pre-existing cracks and flaws are often subj ted to a complex geo echanical environment. He ce, mixed mode fracture is the most common typ of mechanical failure of rock materials. Study of th mechanism of mixed mode fracture of rocks and the measurement of fracture toughness is of great significance in engineering applications. Different types of specimens have been proposed and employed by Keywords: Brittle fracture; mixed mode I/II loading; new specimen; numerical analysis Keywords: Brittle fracture; mixed mode I/II loading; new specimen; numerical analysis

* Corresponding author. Tel.: +44 759648 4143; fax: + 44 117929 4423. E-mail address: yifan.li@bristol.ac.uk * Correspon ing author Tel.: +44 759648 4143; fax: + 44 117929 4423. E-mail address: yifan.li@bristol.ac.uk

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND license (ht ps:// r ativecommons. rg/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.129