PSI - Issue 28

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 1399–1406

© 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 Lattice structure is a type of cellular structure and is used in various engineering applications due to its high strength to weight ratio and excellent energy absorption capacity. A traditional way to examine the response of lattice structures subjected to external loading is to perform experimental research and/or to employ numerical investigation. In this study, however, an analytical model is developed utilizing limit analysis to predict the strength of micro lattice structures. Analytical results are compared to the experimental results of additively manufactured (3D-printed) AlSi10Mg aluminum lattice structures by selective laser melting (SLM). Moreover, 2D and 3D finite element simulations are conducted in order to validate the experimental results as well as to investigate the accuracy of the analytical model. Analytical results are found to be in a reasonable agreement with the experimental results. Furthermore, it is found that 2D numerical simulations are not very consistent with the experimental results; therefore, this study suggests use of 3D finite element modeling in order to fully capture the effect of shear in short beams/struts. © 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 Keywords: Strength; Aluminum alloy; Additive manufacturing, Micro lattice structures 1. Introduction A lattice structure is a type of cellular structure which has a repeating structure of a unit cell (Maconachie et al., 2019). The unit cell consists of interconnected struts and nodes in three dimensional space (Peng et al., 2020). However, lattice structures differ from frames and trusses in a matter of scale. The unit cell of a lattice structure is on Abstract Lattice structure is a type of cellular structure and is used in various engineering applications due to its high strength to weight ratio and excellent energy abs rption capacity. A traditional way t exami the response f lattice structure subjected to ex ernal loading is to p rform expe ime tal research and/or t emplo numerical investigati . In this study, however, an analytical mode is eveloped utilizing limit analysis to predict the strength of icro lattice structures. Analytical results are compared to the exp rimental results of additive manufactured (3D-printed) AlSi10Mg alumin m lattice structures by elective laser melting (SLM). Moreover, 2D an 3D finite element simulations are conducted in order to validat the experimental results well as to investigate the accuracy of the analytical model. An lytical r sults are fou d to be in a reasonable agree with the experimental results. Fur rmore, it is ound that 2D numerical simulation are not very consistent with the experimental resul s; therefore, this study suggests use of 3D inite element mod ling in order t fully capture the effect of shear in short b ams/str ts. © 2020 The Authors. Publish d 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 So i ty (ESIS) ExCo Keywords: Strength; Aluminum alloy; Additive manufacturing, Micro lattice structures 1. Introduction A lattice structure is a type of cellular structure which has a repeating structure of a unit cell (Maconachie et al., 2019). Th unit cell consists interconnected struts and nodes in three dimension l spa (Peng et al., 2020). However, lattice structure differ from fram s and s es in a matter of scale. Th unit cell of a lattice structure is on 1st Virtual European Conference on Fracture Comprehensive Studies on Strength of 3D-printed Aluminum Micro Lattice Structures Fuzuli Ağrı Akçay a,b , Dazhong Wu a , Yuanli Bai a, * 1st Virtual European Conference on Fracture Comprehensive Studies on Strength of 3D-printed Aluminum Micro Lattice Structures Fuzuli Ağrı Akçay a,b , Dazhong Wu a , Yuanli Bai a, * a Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA. b İ stanbul Teknik Üniversitesi Gemi İ n ş aat  ve Deniz Bilimleri Fakültesi, Maslak, İ stanbul 34469, Turkey. a Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA. b İ stanbul Teknik Üniversitesi Gemi İ n ş aat  ve Deniz Bilimleri Fakültesi, Maslak, İ stanbul 34469, Turkey.

* Corresponding author. Tel.: +1-407-823-4548. E-mail address: bai@ucf.edu * Corresponding author. Tel.: +1-407-823-4548. E-mail address: bai@ucf.edu

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 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 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.2020.10.112