Biomolecular origin of the rate-dependent deformation of prismatic enamel

被引：32

作者：

Zhou, Jikou ^{[1
]}

Hsiung, Luke L. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 05期

关键词：

D O I：

10.1063/1.2245439

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Penetration deformation of columnar prismatic enamel was investigated using instrumented nanoindentation testing that was carried out at three constant strain rates (0.05, 0.005, and 0.0005 s(-1)). Enamel demonstrated better resistance to penetration deformation and greater elastic modulus values were measured at higher strain rates. The origin of rate-dependent deformation was rationalized to be the shear deformation of nanoscale protein matrix surrounding each hydroxyapatite crystal rod. The shear modulus of protein matrix was determined. It depends on strain rate in a format G(p)=0.213+0.021 ln epsilon.

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