Transverse mechanical properties of collagen fibers from nanoindentation

被引:21
|
作者
Aifantis, Katerina E. [1 ,2 ]
Shrivastava, Sanjiv [2 ,3 ]
Odegard, Gregory M.
机构
[1] Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA
[2] Aristotle Univ Thessaloniki, Lab Mech, Thessaloniki 54124, Greece
[3] Univ Witwatersrand, Dept Phys, ZA-2050 Johannesburg, South Africa
基金
欧洲研究理事会;
关键词
VISCOELASTIC PROPERTIES; POLYMERIC MATERIALS; I COLLAGEN; CREEP;
D O I
10.1007/s10856-011-4320-9
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The mechanical properties of collagenous tissues, such as tendon and ligaments, are of particular interest as they are found extensively in the human body. In the present study the transverse mechanical properties of collagen fibers are reported for the first time. The elastic modulus was found to be 63 +/- 4 MPa, while the viscosity was estimated to be 14 GPa <= eta <= 56 GPa s. Comparison with similar data in the literature, for bulk tendon and collagen fibrils, suggests that the apparent modulus of a network of interconnected building blocks is reduced as compared to the modulus of the individual building blocks; in particular E-tendon < E-fiber < E-fibril; this is due to the fact that as the scale of the microstructure increases (i) slippage and sliding between the respective building blocks (fibrils or fibers) increases, (ii) the volume fraction of the stiff collagen proteins decreases.
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页码:1375 / 1381
页数:7
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