Page 73 - MSAM-3-4

Materials Science in

Additive Manufacturing

ORIGINAL RESEARCH ARTICLE
Research on impact resistance of AlSi7Mg

uniform and gradient porous structures
manufactured by laser powder bed fusion

2
Mingkang Zhang 1 , Guijun Bi 2 , and Jie Chen *
1 Additive Manufacturing Laboratory, School of Mechanical and Energy Engineering, Guangdong
Ocean University, Yangjiang, Guangdong, China
2 Guangdong Key Laboratory of Modern Control Technology, Institute of Intelligent Manufacturing,
Guangdong Academy of Sciences, Guangzhou, Guangdong, China

Abstract

Triply periodic minimal surfaces (TPMSs) have the advantage of energy absorption
(EA) in automotive, aerospace, and military applications. In this study, uniform and
gradient TPMS sandwich structures were prepared by laser powder bed fusion
technique, and the effects of cell size and gradient type on the deformation and
EA of the structures at different impact velocities were investigated based on drop
hammer impact tests. The results indicate that, among the uniform TPMS sandwich
structures, the structure with a smaller cell size exhibits higher EA and peak impact
force, providing greater impact strength. In contrast, the structure with a larger
cell size has a lower peak acceleration, which is suitable for vibration damping. The
*Corresponding author: gradient distribution effectively disperses the impact capacity to obtain a higher
Jie Chen impact strength; thus, the sine gradient (G-sineI) structure has the best impact
(j.chen@giim.ac.cn) resistance. This work validated the superior EA of gradient TPMS structures and
Citation: Zhang M, Bi G, Chen J. presented a corresponding design method and impact performance evaluation for
Research on impact resistance these structures.
of AlSi7Mg uniform and gradient
porous structures manufactured by
laser powder bed fusion. Mater Sci Keywords: Additive manufacturing; Laser power bed fusion; Gradient porous structure;
Add Manuf. 2024;3(4):5729.
doi: 10.36922/msam.5729 Impact resistance
Received: October 30, 2024
Revised: November 11, 2024
Accepted: November 12, 2024 1. Introduction
Published online: December 05, 2024 Porous structures are widely used in aerospace, biomedical, automotive, and construction
applications due to their excellent properties, including lightweight, high strength,
Copyright: © 2024 Author(s).
1,2
This is an Open-Access article noise reduction, energy absorption (EA), vibration damping, and biocompatibility.
distributed under the terms of the At present, most researches focus on the design and characterization of uniform
Creative Commons Attribution porous structures. However, uniform porous structures are often unable to meet the
License, permitting distribution,
and reproduction in any medium, requirements of complex non-uniform stress-strain states in practical applications,
provided the original work is making them less optimal compared to other structural distributions. Therefore,
properly cited. researchers designed gradient porous structures by mimicking the distribution pattern of
Publisher’s Note: AccScience multiple structures in nature and rationally distributing the porous structures according
Publishing remains neutral with to the local structural properties. Gradient porous structures are usually linear-graded
3,4
regard to jurisdictional claims in
published maps and institutional porous structures due to fewer design methods and performance investigations for non-
affiliations. linear grade structures. However, there is no absolute linear system in lightweight and

Volume 3 Issue 4 (2024) 1 doi: 10.36922/msam.5729