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Giant panda's tooth enamel: Structure, mechanical behavior and toughening mechanisms under indentation
Weng, ZY; Liu, ZQ; Ritchie, RO; Jiao, D; Li, DS; Wu, HL; Deng, LH; Zhang, ZF; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
2016-12-01
Source PublicationJOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
ISSN1751-6161
Volume64Pages:125-138
AbstractThe giant panda's teeth possess remarkable load-bearing capacity and damage resistance for masticating bamboos. In this study, the hierarchical structure and mechanical behavior of the giant panda's tooth enamel were investigated under indentation. The effects of loading orientation and location on mechanical properties of the enamel were clarified and the evolution of damage in the enamel under increasing load evaluated. The nature of the damage, both at and beneath the indentation surfaces, and the underlying toughening mechanisms were explored. Indentation cracks invariably were seen to propagate along the internal interfaces, specifically the sheaths between enamel rods, and multiple extrinsic toughening mechanisms, e.g., crack deflection/twisting and uncracked-ligament bridging, were active to shield the tips of cracks from the applied stress. The giant panda's tooth enamel is analogous to human enamel in its mechanical properties, yet it has superior hardness and Young's modulus but inferior toughness as compared to the bamboo that pandas primarily feed on, highlighting the critical roles of the integration of underlying tissues in the entire tooth and the highly hydrated state of bamboo foods. Our objective is that this study can aid the understanding of the structure-mechanical property relations in the tooth enamel of mammals and further provide some insight on the food habits of the giant pandas. (C) 2016 Elsevier Ltd. All rights reserved.
description.department[weng, z. y. ; liu, z. q. ; jiao, d. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [liu, z. q. ; ritchie, r. o.] univ calif berkeley, dept mat sci & engn, berkeley, ca 94720 usa ; [li, d. s. ; wu, h. l. ; deng, l. h.] china conservat & res ctr giant panda, wolong 623003, peoples r china
KeywordGiant Panda Tooth Enamel Hierarchical Structure Indentation Anisotropy Toughening Mechanisms
Subject AreaEngineering, Biomedical ; Materials Science, bioMaterials
Funding OrganizationNational Natural Science Foundation of China [51501190, 51331007]; Multi-University Research Initiative from the Air Force Office of Scientific Research [AFOSR-FA9550-15-1-0009]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/76174
Collection中国科学院金属研究所
Corresponding AuthorLiu, ZQ; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Weng, ZY,Liu, ZQ,Ritchie, RO,et al. Giant panda's tooth enamel: Structure, mechanical behavior and toughening mechanisms under indentation[J]. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,2016,64:125-138.
APA Weng, ZY.,Liu, ZQ.,Ritchie, RO.,Jiao, D.,Li, DS.,...&Zhang, ZF .(2016).Giant panda's tooth enamel: Structure, mechanical behavior and toughening mechanisms under indentation.JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,64,125-138.
MLA Weng, ZY,et al."Giant panda's tooth enamel: Structure, mechanical behavior and toughening mechanisms under indentation".JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 64(2016):125-138.
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