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Volume 14
Issue 23
10.3390/ma14237467
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Article

Finite Element Analysis on Initial Crack Site of Porous Structure Fabricated by Electron Beam Additive Manufacturing

by
Meng-Hsiu Tsai
1,2,†,
Chia-Ming Yang
3,†,
Yu-Xuan Hung
1,
Chao-Yong Jheng
3,
Yen-Ju Chen
4,
Ho-Chung Fu
1,* and
In-Gann Chen
3,*
1
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807618, Taiwan
2
School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
3
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan
4
Metal Processing R & D Department, Metal Industries Research and Development Centre (MIRDC), Kaohsiung 811, Taiwan
*
Authors to whom correspondence should be addressed.
†
Meng-Hsiu Tsai and Chia-Ming Yang contributed equally to this manuscript as the first authors.
Materials 2021, 14(23), 7467; https://doi.org/10.3390/ma14237467
Submission received: 31 October 2021 / Revised: 28 November 2021 / Accepted: 30 November 2021 / Published: 6 December 2021
(This article belongs to the Topic Material and Process Innovations for 3D Printing Applications)
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Abstract

Ti6Al4V specimens with porous structures can be fabricated by additive manufacturing to obtain the desired Young’s modulus. Their mechanical strength and deformation behavior can be evaluated using finite element analysis (FEA), with various models and simulation methodologies described in the existing literature. Most studies focused on the evaluation accuracy of the mechanical strength and deformation behavior using complex models. This study presents a simple elastic model for brittle specimens followed by an electron beam additive manufacturing (EBAM) process to predict the initial crack site and threshold of applied stress related to the failure of cubic unit lattice structures. Six cubic lattice specimens with different porosities were fabricated by EBAM, and compression tests were performed and compared to the FEA results. In this study, two different types of deformation behavior were observed in the specimens with low and high porosities. The adopted elastic model and the threshold of applied stress calculated via FEA showed good capabilities for predicting the initial crack sites of these specimens. The methodology presented in this study should provide a simple yet accurate method to predict the fracture initiation of porous structure parts.
Keywords: electron beam additive manufacturing; Ti6Al4V; brittleness; finite element analysis; elastic model; initial crack site electron beam additive manufacturing; Ti6Al4V; brittleness; finite element analysis; elastic model; initial crack site
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MDPI and ACS Style

Tsai, M.-H.; Yang, C.-M.; Hung, Y.-X.; Jheng, C.-Y.; Chen, Y.-J.; Fu, H.-C.; Chen, I.-G. Finite Element Analysis on Initial Crack Site of Porous Structure Fabricated by Electron Beam Additive Manufacturing. Materials 2021, 14, 7467. https://doi.org/10.3390/ma14237467

AMA Style

Tsai M-H, Yang C-M, Hung Y-X, Jheng C-Y, Chen Y-J, Fu H-C, Chen I-G. Finite Element Analysis on Initial Crack Site of Porous Structure Fabricated by Electron Beam Additive Manufacturing. Materials. 2021; 14(23):7467. https://doi.org/10.3390/ma14237467

Chicago/Turabian Style

Tsai, Meng-Hsiu, Chia-Ming Yang, Yu-Xuan Hung, Chao-Yong Jheng, Yen-Ju Chen, Ho-Chung Fu, and In-Gann Chen. 2021. "Finite Element Analysis on Initial Crack Site of Porous Structure Fabricated by Electron Beam Additive Manufacturing" Materials 14, no. 23: 7467. https://doi.org/10.3390/ma14237467

APA Style

Tsai, M.-H., Yang, C.-M., Hung, Y.-X., Jheng, C.-Y., Chen, Y.-J., Fu, H.-C., & Chen, I.-G. (2021). Finite Element Analysis on Initial Crack Site of Porous Structure Fabricated by Electron Beam Additive Manufacturing. Materials, 14(23), 7467. https://doi.org/10.3390/ma14237467

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