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Interfacial toughening effect of suture structures
Liu, Zengqian1,2; Zhang, Zhefeng1,2; Ritchie, Robert O.3
Corresponding AuthorLiu, Zengqian(zengqianliu@imr.ac.cn) ; Zhang, Zhefeng(zhfzhang@imr.ac.cn) ; Ritchie, Robert O.(roritchie@lbl.gov)
2020-01-15
Source PublicationACTA BIOMATERIALIA
ISSN1742-7061
Volume102Pages:75-82
AbstractSuture interfaces are one of the most common architectural designs in natural material-systems and are critical for ensuring multiple functionalities by providing flexibility while maintaining connectivity. Despite intensive studies on the mechanical role of suture structures, there is still a lack of understanding on the fracture mechanics of suture interfaces in terms of their interactions with impinging cracks. Here we reveal an interfacial toughening effect of suture structures by means of "excluding" cracks away from interfaces based on a dimensionless micro-mechanical model for single-leveled and hierarchical suture interfaces with triangular-shaped suture teeth. The effective stress-intensity driving forces for crack deflection along, versus penetration through, an interface at first impingement and on subsequent kinking are formulated and compared with the corresponding resistances. Quantitative criteria are established for discerning the cracking modes and fracture resistance of suture interfaces with their dependences on sutural tooth sharpness and interfacial toughness clarified. Additionally, the effects of structural hierarchy are elucidated through a consideration of hierarchical suture interfaces with fractal-like geometries. This study may offer guidance for designing bioinspired suture structures, especially for toughening materials where interfaces are a key weakness. Statement of significance Suture interfaces are one of the most common architectural material designs in biological systems, and are found in a wide range of species including armadillo osteoderms, boxfish armor, pangolin scales and insect cuticles. They are designed to provide flexibility while maintaining connectivity. Despite many studies on the mechanical role of suture structures, there is still little understanding of their role in terms of interactions with impinging cracks. Here we reveal an interfacial toughening effect of suture structures by means of "excluding" cracks away from interfaces based on a dimensionless micro-mechanical model for single-leveled and hierarchical suture interfaces with triangular-shaped suture teeth. Quantitative criteria are established for discerning the cracking mode and fracture resistance of the interfaces with their dependences on sutural tooth sharpness and interfacial toughness clarified. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordSuture Crack Interface Hierarchy Toughening
Funding OrganizationNational Natural Science Foundation of China ; Multi University Research Initiative from the Air Force Office of Scientific Research
DOI10.1016/j.actbio.2019.11.034
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51871216] ; National Natural Science Foundation of China[51331007] ; Multi University Research Initiative from the Air Force Office of Scientific Research[AFOSR-FA9550-15-1-0009]
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Biomedical ; Materials Science, Biomaterials
WOS IDWOS:000509786400004
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/137192
Collection中国科学院金属研究所
Corresponding AuthorLiu, Zengqian; Zhang, Zhefeng; Ritchie, Robert O.
Affiliation1.Chinese Acad Sci, Inst Met Res, Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
Recommended Citation
GB/T 7714
Liu, Zengqian,Zhang, Zhefeng,Ritchie, Robert O.. Interfacial toughening effect of suture structures[J]. ACTA BIOMATERIALIA,2020,102:75-82.
APA Liu, Zengqian,Zhang, Zhefeng,&Ritchie, Robert O..(2020).Interfacial toughening effect of suture structures.ACTA BIOMATERIALIA,102,75-82.
MLA Liu, Zengqian,et al."Interfacial toughening effect of suture structures".ACTA BIOMATERIALIA 102(2020):75-82.
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