Influence of Defects on the Effective Properties of Selectively Laser Melted Cellular Structures
Abstract
Cellular structures have continued to gain increased interest over the years due to their excellent properties and advancements in manufacturing. This work investigates the influence of laser powder bed fusion (L-PBF) manufacturing-induced defects on the effective properties of the octet-truss (OT) lattice structure. Four configurations of the two different defect types, namely missing struts and reduced struts, were investigated numerically. Unit-cell models were developed in Abaqus CAE commercial software to predict the effective elastic modulus and the OT structure’s effective yield strength (0.2% offset). The developed models were validated using experimental results. The validated models were then extended to investigate the effects of defects on the effective elastic modulus and the effective yield strength of the OT structure. Results indicated that both defects (reduced strut and missing strut) negatively affected the relative density, effective elastic modulus, and the effective yield strength of the OT structure. The location of the defect influenced the degree to which the effective properties were reduced. OT structures with missing strut defects experienced a higher reduction in effective properties than OT structures with reduced strut defects. It was also observed that the investigated defects were more detrimental to the OT structure’s effective yield strength compared to the effective elastic modulus.
Recommended Citation
O. Fashanu et al., "Influence of Defects on the Effective Properties of Selectively Laser Melted Cellular Structures," International Journal of Advanced Design and Manufacturing Technology, Springer, Jun 2021.
The definitive version is available at https://doi.org/10.1007/s00170-021-07507-3
Department(s)
Mechanical and Aerospace Engineering
Second Department
Materials Science and Engineering
Research Center/Lab(s)
Center for High Performance Computing Research
Keywords and Phrases
Laser powder bed fusion; Defects; Cellular structures; Effective properties; Octet-truss structure
International Standard Serial Number (ISSN)
2252-0406
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2021 The Authors, All rights reserved.
Publication Date
30 Jun 2021
Comments
This work was funded by the Department of Energy's Kansas City National Security Campus, which is operated and managed by Honeywell Federal Manufacturing & Technologies, LLC under contract number DE-NA0002839.