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Transverse mechanical properties of collagen fibers from nanoindentation

  • Katerina E. Aifantis
  • Sanjiv Shrivastava
  • Gregory M. Odegard
Article

Abstract

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 \( 14\;{\text{GPa}} \le \eta \le 56\;{\text{GPa}}\;{\text{s}} \). 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.

Keywords

Elastic Modulus Atomic Force Microscopy Fibril Collagen Fiber Collagen Fibril 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

KEA and SS are grateful for support from KEA’s European Research Council Starting Grant, MINATRAN-211166. The authors are also thankful to Ms. Betty for her assistance in the experiments.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Katerina E. Aifantis
    • 1
    • 2
  • Sanjiv Shrivastava
    • 1
    • 3
  • Gregory M. Odegard
    • 4
  1. 1.Laboratory of MechanicsAristotle University of ThessalonikiThessalonikiGreece
  2. 2.Department of PhysicsMichigan Technological UniversityHoughtonUSA
  3. 3.Department of PhysicsUniversity of the WitwatersrandWitsSouth Africa
  4. 4.Mechanical EngineeringMichigan Technological UniversityHoughtonUSA

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