title: Effect of water desorption on the rheology and dynamic response of human hair to a non-contact impact.
abstract: Human hair is a non-homogeneous complex material made of keratin fibers oriented along the longitudinal axis which offer anisotropic mechanical properties. Nowadays, it is possible to measure the mechanical properties of hairs with the classical tests, but most often, these tests are destructive and make hard to measure the influence of some external factors or treatments on the behavior of a same hair fiber. In the current paper, vibrations induced by a non-contact impact have been utilized as a representative response of the mechanical behavior of hair. The characteristics of the vibratory response allow measuring the variation in the mechanical properties and the instantaneous effect of an external factor on the properties of a same sample. First, load relaxation tests have been performed on hair samples after moisturization and for different times of an air-drying process in order to characterize the change in the visco-elastic behavior of hair during the water desorption. Other hair samples have been tested with our non-contact impact and vibration technique in order to observe the change in the vibratory response during the water desorption. The vibratory response has then been correlated to the mechanical properties of the hair fiber.
authors: Université de Lyon, Ecole Centrale de Lyon, ENISE, LTDS, CNRS-UMR5513, 69134 Ecully, France; Société Calor/Groupe Seb, Département Soins de la Personne, 38780 Pont Eveque, France. Electronic address: juliette.jamart@ec-lyon.fr.
authors: J
authors: J
authors: Jamart
authors: Université de Lyon, Ecole Centrale de Lyon, ENISE, LTDS, CNRS-UMR5513, 69134 Ecully, France.
authors: M
authors: M
authors: Djaghloul
authors: Université de Lyon, Ecole Centrale de Lyon, ENISE, LTDS, CNRS-UMR5513, 69134 Ecully, France.
authors: J M
authors: JM
authors: Bergheau
authors: Université de Lyon, Ecole Centrale de Lyon, ENISE, LTDS, CNRS-UMR5513, 69134 Ecully, France.
authors: H
authors: H
authors: Zahouani
mesh_terms: D001696:Biomechanical Phenomena; D006197:Hair / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena; D012212:Rheology; D013718:Tensile Strength; D014732:Vibration; D014867:Water / Q000737:chemistry*; D016474:Weight-Bearing
chemical_list: D014867:Water
keywords: Human hair; Impact test; Induced vibration; Water desorption