Structure and mechanical behavior of human hair

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Yang Yu
  • Wen Yang
  • Bin Wang
  • Marc André Meyers


Original languageEnglish
Pages (from-to)152-163
Journal / PublicationMaterials Science and Engineering C
Publication statusPublished - 1 Apr 2017
Externally publishedYes


The understanding of the mechanical behavior of hair under various conditions broadens our knowledge in biological materials science and contributes to the cosmetic industry. The hierarchical organization of hair is studied from the intermediate filament to the structural levels. The effects of strain rate, relative humidity, and temperature are evaluated. Hair exhibits a high tensile strength, 150–270 MPa, which is significantly dependent on strain rate and humidity. The strain-rate sensitivity, approximately 0.06–0.1, is comparable to that of other keratinous materials and common synthetic polymers. The structures of the internal cortex and surface cuticle are affected by the large tensile extension. One distinguishing feature, the unwinding of the α-helix and the possible transformation to β-sheet structure of keratin under tension, which affects the ductility of hair, is analytically evaluated and incorporated into a constitutive equation. A good agreement with the experimental results is obtained. This model elucidates the tensile response of the α-keratin fibers. The contributions of elastic and plastic strains on reloading are evaluated and correlated to structural changes.

Research Area(s)

  • Human hair, Keratin, Mechanical properties, Strain-rate sensitivity

Bibliographic Note

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Citation Format(s)

Structure and mechanical behavior of human hair. / Yu, Yang; Yang, Wen; Wang, Bin et al.
In: Materials Science and Engineering C, Vol. 73, 01.04.2017, p. 152-163.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review