On fracture mechanism of additively manufactured triply periodic minimal surface structures using an explicit phase field model

被引:2
作者
Li, Cunyi [1 ]
Fang, Jianguang [1 ]
Qiu, Na [2 ]
Wu, Chi [3 ]
Steven, Grant [3 ]
Li, Qing [3 ]
机构
[1] Univ Technol Sydney, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia
[2] Hainan Univ, Mech & Elect Engn Coll, Haikou 570228, Peoples R China
[3] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia
基金
澳大利亚研究理事会;
关键词
Triply periodic minimal surface; Phase field fracture; Additive manufacturing; Crushing behaviour; Fracture mechanism; POROUS SCAFFOLD DESIGN; DUCTILE FRACTURE; ENERGY-ABSORPTION; BRITTLE-FRACTURE; ALUMINUM FOAM; DAMAGE MODEL; STRAIN; DEFORMATION; FORMULATION; LOCUS;
D O I
10.1016/j.addma.2024.104192
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Triply periodic minimal surface (TPMS) structures have been extensively studied for their exceptional mechanical characteristics. However, numerical analysis of their fracture behaviour remains insufficient due to the complexity of the fracture mechanism. This study aims to utilise a new phase field model to predict the mechanical responses and analyse the fracture mechanism of TPMS gyroid (G) and primitive (P) structures. Firstly, the G and P structures were additively manufactured using Ti-6Al-4 V titanium and tested under both axial and oblique compression. Secondly, an explicit phase field model was developed by incorporating the Bao-Wierzbicki fracture model to capture damage initiations. It was found that the developed explicit phase field model enables accurate reproduction of experimental force-displacement responses, deformation modes, crack initiations and propagations for G and P structures under both loading conditions. It was found that medium stress triaxiality tension was the dominant stress state to trigger material damage, regardless of structure and loading condition. Moreover, compared with axial compression, oblique loading introduced a more non-proportional loading history, leading damage initiation points far away from the fracture locus. Further, in comparison with the G structure, the P structure involved more medium and high stress triaxiality tension induced fracture initiations, resulting in more damaged material points. This study offers valuable insight into the fracture mechanism of TPMS structures, which is beneficial to improving the design of these structures.
引用
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页数:22
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