Accurate determination of the structural elasticity of human hair by a small-scale bending test

Hironori Tohmyoh, Mitsuharu Ishihara, M. A. Salam Akanda, Satoshi Yamaki, Tomoko Watanabe, Tokuro Iwabuchi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

This paper reports on a small-scale bending method for human hair. The test sample, which is elliptical in cross-section, is fixed to a hollow steel needle using resin to form a cantilever. A loading probe is used to subject this to a lateral load, where the load is applied parallel to either the long or short axis of the elliptical cross-section. From these tests, load-displacement relationships for the hair were obtained. From the experimental data and analysis, we found that the structural elasticity determined is independent of the direction of bending, and precise measurements of the structural elasticity of human hair with scattering of less than 5% were realized using this test scheme. Finally, changes in the structural elasticity of hair due to hair treatments were detected and the changes are discussed based on a theoretical model of the multi-layered structure.

Original languageEnglish
Pages (from-to)2833-2837
Number of pages5
JournalJournal of Biomechanics
Volume44
Issue number16
DOIs
Publication statusPublished - 2011 Nov 10

Keywords

  • Area moment of inertia
  • Hair treatment
  • Human hair
  • Loading direction
  • Small-scale bending test
  • Structural elasticity

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

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