Improved Compressive Properties of Lattice Structure Based on an Implicit Surface Hybrid Optimization Design Method via Selective Laser Melting

In recent years, the lattice structure produced by additive manufacturing is a type of metal foam that has been increasingly investigated for its unique mechanical properties. However, the conventional Computer-Aided Design (CAD) is inefficient, the triply periodic minimal surfaces are rarely mixed,...

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Bibliographic Details
Published in:Metals (Basel ) 2022-09, Vol.12 (9), p.1477
Main Authors: Xiao, Xiong, Xie, Liangwen, Tang, Rongyao, Liu, Jiaan, Song, Peng, Zhu, Xianyong, Zhao, Jiali, Jiang, Cheng, Yang, Song, Wu, Peng
Format: Article
Language:English
Subjects:
Alloys
Analysis
CAD
CAD-CAM systems
compression test
Compressive properties
Computer aided design
Computer programs
Design optimization
Design techniques
Energy
Energy absorption
fabrication
Finite element analysis
Finite element method
Geometry
hybrid design
Laser beam melting
Lasers
Mechanical properties
Metal foams
metallic foams
Methods
Minimal surfaces
Software
Stress concentration
Stress management
Yield stress
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Summary:In recent years, the lattice structure produced by additive manufacturing is a type of metal foam that has been increasingly investigated for its unique mechanical properties. However, the conventional Computer-Aided Design (CAD) is inefficient, the triply periodic minimal surfaces are rarely mixed, and the smooth transitions at the boundaries are not considered. In this study, a hybrid optimization design method based on implicit surfaces is proposed, which combines multiple implicit surfaces to achieve the continuous change in the curvature at the structure junctions and reduce the stress concentration. The hybrid lattice structures designed by this method were additively manufactured using 316L alloy via a selective laser melting. The results of the finite element analysis and mechanical compression test show that the hybrid lattice structures generated by this method exhibit a higher yield strength and energy absorption. These works can be used for other implicit surfaces, improve and enrich the types of implicit surfaces, and provide more good choices for practical applications.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12091477