Analytical solution and experimental study of effective Young’s modulus of SLM-fabricated lattice structure with triangular unit cells

Niu, Jie; Choo, Hui Leng; Sun, Wei; Mok, Sui Him

Abstract

Research on materials, design, processing, and manufacturability of parts produced by additive manufacturing (AM) has been investigated significantly in the past. However, limited research on tensile behavior of cellular lattice structures by AM was carried out. In this paper, effective tensile Young's modulus, E*, of triangular lattice structures was determined. Firstly, analytical solution was derived based on Euler–Bernoulli beam theory. Then, numerical results of E* were obtained by finite element analysis (FEA) for triangular lattice structures classified by three shape parameters. The effects of side length, L, beam thickness, t, and height, h, on E* were investigated individually. FEA results revealed that there is a relationship between E* and the relative density and shape parameters. Among them, t has the most significant effect on E*. Numerical results were also compared with the results from modified general function for cellular structures and modified formula for triangular honeycomb. The E* predicted by the proposed analytical solution shows the best agreement with the numerical results. Finally, tensile tests were carried out using AlSi10 Mg triangular lattice structures manufactured by selective laser melting (SLM) process. The experimental results show that both analytical and numerical solutions are able to predict E* with good accuracy. In the future, the proposed solution can be used to design lightweight structures with triangular unit cells.

Citation

Niu, J., Choo, H. L., Sun, W., & Mok, S. H. (2018). Analytical solution and experimental study of effective Young’s modulus of SLM-fabricated lattice structure with triangular unit cells. Journal of Manufacturing Science and Engineering, 140(9), Article 091008. https://doi.org/10.1115/1.4040159

• Journal Article Type: Article
• Acceptance Date: Apr 26, 2018
• Online Publication Date: Jun 28, 2018
• Publication Date: Sep 1, 2018
• Deposit Date: Apr 23, 2018
• Journal: Journal of Manufacturing Science and Engineering
• Print ISSN: 1087-1357
• Electronic ISSN: 1528-8935
• Publisher: American Society of Mechanical Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 140
• Issue: 9
• Article Number: 091008
• DOI: https://doi.org/10.1115/1.4040159
• Keywords: Lattice structure; Effective Young’s modulus; Analytical solution; Finite Element Analysis; Additive Manufacturing
• Public URL: https://nottingham-repository.worktribe.com/output/926983
• Publisher URL: http://manufacturingscience.asmedigitalcollection.asme.org/article.aspx?articleid=2681027
• Contract Date: Apr 20, 2018