PSI - Issue 37

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 37 (2022) 49–56

© 2022 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 Pedro Miguel Guimaraes Pires Moreira © 2022 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 Pedro Miguel Guimaraes Pires Moreira Abstract Octet-tr s lattices printed by photo olymer have been used in this research to investigate the orientation effects on fra ture behavi urs. Octe -truss l ttices wer print d into CT samples in three orthogonal orientations. The fracture resis ances an crack aths for different orienta ions la tic s were obtained and ompared. The finite element method wi beam eleme t was used in the present study to simulat th fracture ponse of this st u tu . Both th load reaction and c ack paths were obtained in simulations and compared with the experimental results. The numerical results agree well with the test results. © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acces article under the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira ICSI 2021 The 4th International Conference on Structural Integrity Fracture behaviour of octet-truss lattices in different orientations Yifan Li *, Martyn Pavier, Harry Coules Department of Mechanical Engineering, University of Bristol, Queen’s Building, University Walk, Bristol BS8 1TR, UK Abstract Octet-truss lattices printed by photopolymer have been used in this research to investigate the orientation effects on fracture behaviours. Octet-truss lattices were printed into CT samples in three orthogonal orientations. The fracture resistances and crack paths for different orientations lattices were obtained and compared. The finite element method with beam element was used in the present study to simulate the fracture response of this structure. Both the load reaction and crack paths were obtained in simulations and compared with the experimental results. The numerical results agree well with the test results. ICSI 2021 The 4th International Conference on Structural Integrity Fracture behaviour of octet-truss lattices in different orientations Yifan Li *, Martyn Pavier, Harry Coules Department of Mechanical Engineering, University of Bristol, Queen’s Building, University Walk, Bristol BS8 1TR, UK 1. Introduction Periodic lattice structures have a high potential for use in modern industries such as medicine, automotive and aerospace, because of their advantages of high porosity, high energy absorption and high strength-to-density ratios (Hedayati et al. 2017; Zheng et al. 2014; Banhart 2001). With the development of additive manufacturing technology, the fabrication of complex lattice structures become possible (Wang et al. 2018; Hussein et al. 2013). In general, the macroscopic mechanical properties of lattice structures are mainly related to the parent materials, relative density and node connectivity (Deshpande et al. 2001; Płatek et al. 2020; Ling et al. 2019) . Stretching dominated lattices are lattices with high nodal connectivity, like triangular lattices and octet-truss lattices, generally 1. Introduction Periodic lattice structures have a high potential for use in modern industries such as medicine, automotive and aerospace, because of t ir adv ntages of high porosity, high energy absorpti n an high strength-to-density ratios (Hedayati et al. 2017; Zheng et al. 2014; Banhart 2001). With the dev lopment of additive manufacturing technology, the fabrication of complex lattice structures become possible (Wang et al. 2018; Hussein et al. 2013). In gen ral, the macroscopic mechanical properti s of lattice structures are mainly related to the parent materials, relative density and node onnectivity (Deshpande et al. 2001; Płatek et l. 2020; Ling et al. 2019) . Str tching dominated lattices are lattices with high nodal connectivity, like triangular lattices and octet-truss lattices, generally Keywords: Octet-truss lattice, different orientations, fracture test, FE simulation Keywords: Octet-truss lattice, different orientations, fracture test, FE simulation

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

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acces article under the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.058