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Viscoelasticity Measurement of Softness by Indentation Devices for Evaluation of Human Skin

[+] Author Affiliations
Atsushi Sakuma, Yuma Sango

Tokyo University of Agriculture and Technology, Koganei-city, Tokyo, Japan

Paper No. IMECE2014-38261, pp. V003T03A088; 4 pages
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 3: Biomedical and Biotechnology Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4646-9
  • Copyright © 2014 by ASME


In this paper, spherical indentation testing is studied to evaluate the viscoelasticity of soft materials like human skin. Here, the Hertzian contact theory is functionally extended to evaluate indentations for the thin tissues. In the expansions, the technique used for evaluating the thickness of finite specimens is first explained by analyzing the experimental results of indentations. Then, the viscoelasticity of soft materials with finite thickness is theoretically derived by defining an equivalent indentation strain for the analysis of the indentation process. The expansions are examined to evaluate its reliability by applying them to measure the viscoelasticity of some soft materials. Furthermore, this technology is applied to the elasticity investigation of the human skin. Especially, the measurement results of viscoelastic characteristics of the skin of human face are shown as the first report. The influences of sex and ultraviolet rays and so on are discussed to reveal the mechanics of human skin in this report. Moreover, it is discussed about the validity of the device which measures the elasticity of the skin of human face.

Copyright © 2014 by ASME
Topics: Viscoelasticity , Skin



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