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) 41–48

© 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 crack grow h rates of octet-truss lat ice were studied using experime al method in this re ear h. I order to perform the fatigu test, octet-truss lattices in differ nt orienta ions were 3D printed into compac tension sp cimen geometry us ng phot polymer. The fatigue crack paths for different orientations latt ces were obtained from the experi ent and compared with ach other. The fatigue crack grow h ates of lattices in d fferent orien ations wer calcula ed u ing complianc method sug ested by ASTM E647. The experimental results show that orientation-Z lattice has the greatest resistance to fatigue crack propagation. © 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 1. Introduction Octet-truss lattice is a typical stretching-dominated lattic , with a u it cell of nodal on ectivity equal to 12 acco ding to the research by Deshpande et al. (2001a). Literatures concluded that stretching-dominated lattices generally have higher specific efficiency compared to b nding-dominated lattices (Deshpande et al. 2001b; Li et al. 2020). Therefore, stretching-do inated lattices are mo e suitable t be used as lightweight bearing structures, and bending-dominated lattices are more widely used in energy absorption applications. ICSI 2021 The 4th International Conference on Structural Integrity Experimental study on fatigue crack propagation of octet-truss lattice Yifan Li *, Martyn Pavier, Harry Coules Department of Mechanical Engineering, University of Bristol, Queen’s Building, University Walk, Bristol BS8 1TR, UK Abstract Orientation effects on fatigue crack growth rates of octet-truss lattice were studied using experimental method in this research. In order to perform the fatigue test, octet-truss lattices in different orientations were 3D printed into compact tension specimen geometry using photopolymer. The fatigue crack paths for different orientations lattices were obtained from the experiment and compared with each other. The fatigue crack growth rates of lattices in different orientations were calculated using compliance method suggested by ASTM E647. The experimental results show that orientation-Z lattice has the greatest resistance to fatigue crack propagation. ICSI 2021 The 4th International Conference on Structural Integrity Experimental study on fatigue crack propagation of octet-truss lattice Yifan Li *, Martyn Pavier, Harry Coules Department of Mechanical Engineering, University of Bristol, Queen’s Building, University Walk, Bristol BS8 1TR, UK Abstract Ori ntation effects on Keywords: Octet-truss lattice, different orientations, fatigue test, crack growth rate Keywords: Octet-truss lattice, different orientations, fatigue test, crack growth rate 1. Introduction Octet-truss lattice is a typical stretching-dominated lattice, with a unit cell of nodal connectivity equal to 12 according to the research by Deshpande et al. (2001a). Literatures concluded that stretching-dominated lattices generally have higher specific efficiency compared to bending-dominated lattices (Deshpande et al. 2001b; Li et al. 2020). Therefore, stretching-dominated lattices are more suitable to be used as lightweight bearing structures, and bending-dominated lattices are more widely used in energy absorption applications.

* 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.2022.01.057