Structure and mechanical properties of Saxidomus purpuratus biological shells

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	Structure and mechanical properties of Saxidomus purpuratus biological shells
	W. Yang; G. P. Zhang; X. F. Zhu; X. W. Li; M. A. Meyers
	2011
发表期刊	Journal of the Mechanical Behavior of Biomedical Materials
ISSN	1751-6161
卷号	4 期号:7 页码:1514-1530
摘要	The strength and fracture behavior of Saxidomus purpuratus shells were investigated and correlated with the structure. The shells show a crossed lamellar structure in the inner and middle layers and a fibrous/blocky and porous structure composed of nanoscaled particulates (similar to 100 nm diameter) in the outer layer. It was found that the flexure strength and fracture mode are a function of lamellar organization and orientation. The crossed lamellar structure of this shell is composed of domains of parallel lamellae with approximate thickness of 200-600 nm. These domains have approximate lateral dimensions of 10-70 mu m with a minimum of two orientations of lamellae in the inner and middle layers. Neighboring domains are oriented at specific angles and thus the structure forms a crossed lamellar pattern. The microhardness across the thickness was lower in the outer layer because of the porosity and the absence of lamellae. The tensile (from flexure tests) and compressive strengths were analyzed by means of Weibull statistics. The mean tensile (flexure) strength at probability of 50%, 80-105 MPa, is on the same order as the compressive strength (similar to 50-150 MPa) and the Weibull moduli vary from 3.0 to 7.6. These values are significantly lower than abalone nacre, in spite of having the same aragonite structure. The lower strength can be attributed to a smaller fraction of the organic interlayer. The fracture path in the specimens is dominated by the orientation of the domains and proceeds preferentially along lamella boundaries. It also correlates with the color changes in the cross section of the shell. The cracks tend to undergo a considerable change in orientation when the color changes abruptly. The distributions of strengths, cracking paths, and fracture surfaces indicate that the mechanical properties of the shell are anisotropic with a hierarchical nature. (C) 2011 Elsevier Ltd. All rights reserved.
部门归属	[yang, w.; zhang, g. p.; zhu, x. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [yang, w.; li, x. w.] northeastern univ, coll sci, inst mat phys & chem, shenyang 110004, peoples r china. [meyers, m. a.] univ calif san diego, dept mech & aerosp engn, la jolla, ca 92093 usa. [meyers, m. a.] univ calif san diego, dept nanoengn, la jolla, ca 92093 usa.;zhang, gp (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;gpzhang@imr.ac.cn
关键词	Shell Strength Fracture Microstructure Bending Compression Bivalves Saxidomus Purpuratus Crossed-lamellar Structure Strombus-gigas Abalone Shell Microstructural Characterization Fracture-toughness Organic Matrix Mollusk Shell Flat Pearls Nacre Behavior
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WOS记录号	WOS:000294187500061
引用统计	被引频次：58[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30832
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Yang,G. P. Zhang,X. F. Zhu,et al. Structure and mechanical properties of Saxidomus purpuratus biological shells[J]. Journal of the Mechanical Behavior of Biomedical Materials,2011,4(7):1514-1530.
APA	W. Yang,G. P. Zhang,X. F. Zhu,X. W. Li,&M. A. Meyers.(2011).Structure and mechanical properties of Saxidomus purpuratus biological shells.Journal of the Mechanical Behavior of Biomedical Materials,4(7),1514-1530.
MLA	W. Yang,et al."Structure and mechanical properties of Saxidomus purpuratus biological shells".Journal of the Mechanical Behavior of Biomedical Materials 4.7(2011):1514-1530.