Network-based and sheet-based Gyroid lattice structures with different gradient directions: manufacture, mechanical response and energy absorption

IF 1.9 3区 工程技术 Q3 MECHANICS
Bo Hao, Zhiming Zhu, Li Zhang
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Abstract

To investigate the effect of gradient direction on mechanical properties and energy absorption capability of Gyroid lattice structures (GLSs), network-based and sheet-based lattice structures (G1-N768, G2-N768, G1-S768, G2-S768) of different gradient directions with an average porosity of 70% were established. The Al-Si10-Mg samples were manufactured through selective laser melting (SLM). Through compression tests and finite element analysis (FEA), the energy absorption, deformation behavior, and mechanical properties of the GLSs were evaluated. The data exhibited good consistency, and the deviations of yield strength, elastic modulus, plateau stress, densification strain and energy absorption could be controlled at about 10%. The results indicated that whether it is network-based or sheet-based GLSs, by changing the gradient direction, the deformation behavior could be transformed from layer-by-layer deformation (G1-GLSs) to uniform deformation (G2-GLSs), and thus realize the regulation of mechanical properties. At the same time, due to different topological configurations, stretch-dominated sheet-based GLSs (G1-S768, G2-S768) exhibited higher energy absorption capability and mechanical properties than bending-dominated network-based GLSs (G1-N768, G2-N768), and the energy absorption, yield strength and elastic modulus increased by 93.7%, 80.8% and 66.7%, respectively. In addition, the introduction of the Johnson–Cook model has effectively simulated the failure behavior of GLSs. This paper can offer theoretical guidance for the subsequent performance regulation and application of functionally graded GLSs.

Abstract Image

具有不同梯度方向的网状和片状 Gyroid 晶格结构:制造、机械响应和能量吸收
为了研究梯度方向对Gyroid晶格结构(GLSs)机械性能和能量吸收能力的影响,我们建立了不同梯度方向的网状和片状晶格结构(G1-N768、G2-N768、G1-S768、G2-S768),其平均孔隙率为70%。铝-硅-10-镁样品是通过选择性激光熔融(SLM)制造的。通过压缩试验和有限元分析,对 GLS 的能量吸收、变形行为和机械性能进行了评估。数据显示出良好的一致性,屈服强度、弹性模量、高原应力、致密化应变和能量吸收的偏差均可控制在 10% 左右。结果表明,无论是网状 GLS 还是片状 GLS,通过改变梯度方向,都可以将变形行为从逐层变形(G1-GLS)转变为均匀变形(G2-GLS),从而实现对力学性能的调控。同时,由于拓扑结构的不同,拉伸为主的片状 GLS(G1-S768、G2-S768)比弯曲为主的网状 GLS(G1-N768、G2-N768)具有更高的能量吸收能力和力学性能,能量吸收率、屈服强度和弹性模量分别提高了 93.7%、80.8% 和 66.7%。此外,Johnson-Cook 模型的引入还有效地模拟了 GLS 的失效行为。本文可为功能分级 GLS 的后续性能调节和应用提供理论指导。
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来源期刊
Meccanica
Meccanica 物理-力学
CiteScore
4.70
自引率
3.70%
发文量
151
审稿时长
7 months
期刊介绍: Meccanica focuses on the methodological framework shared by mechanical scientists when addressing theoretical or applied problems. Original papers address various aspects of mechanical and mathematical modeling, of solution, as well as of analysis of system behavior. The journal explores fundamental and applications issues in established areas of mechanics research as well as in emerging fields; contemporary research on general mechanics, solid and structural mechanics, fluid mechanics, and mechanics of machines; interdisciplinary fields between mechanics and other mathematical and engineering sciences; interaction of mechanics with dynamical systems, advanced materials, control and computation; electromechanics; biomechanics. Articles include full length papers; topical overviews; brief notes; discussions and comments on published papers; book reviews; and an international calendar of conferences. Meccanica, the official journal of the Italian Association of Theoretical and Applied Mechanics, was established in 1966.
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