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GlossaryYoung's modulus (Modulus of elasticity)

measures material stiffness by stress-to-strain ratio in elasticity

Young's modulus, also known as the elastic modulus, is a measure of the stiffness of a material. It quantifies how much a material will deform under a given amount of stress. Specifically, it is the ratio of tensile stress (force per unit area) to tensile strain (proportional deformation) in the linear elasticity region of the material. This property is crucial in fields like materials science and engineering, as it helps predict how materials will behave under different forces.

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research Mechanical Behavior of Scalp Hair in Premature and Full-Term Neonates

1 citations , January 1997 in “Skin Pharmacology and Physiology”

Premature infants have less elastic hair than full-term infants.

research Changes in the Mechanical Properties of Human Hair Under Various Conditions

June 2010 in “DR-NTU (Nanyang Technological University)”

The study investigated the tensile properties of human hair under conditions of hair coloring and chlorine exposure using samples from 10 individuals of the Chinese population. The results indicated significant differences in maximum load and ultimate tensile stress between normal hair and hair subjected to both conditions. Chlorine exposure significantly affected the strain at break, while hair coloring did not. Additionally, hair coloring significantly altered the modulus of elasticity, whereas chlorine exposure did not.

research Biomechanical Properties of Scalp Flaps and Their Correlations to Reconstructive and Aesthetic Surgery Procedures

28 citations , May 1998 in “Skin Research and Technology”

Scalp flaps are stiffer than skin from other body areas, which helps in planning reconstructive and cosmetic head surgeries.

research Ultrasonic and Infrared Hair Treatment: Scientific Justification and Application Practice

December 2025 in “The American Journal of Medical Sciences and Pharmaceutical Research”

Ultrasonic and infrared treatments can improve hair strength and appearance with minimal damage.

research Keratin Network Modifications Lead to the Mechanical Stiffening of the Hair Follicle Fiber

40 citations , May 2016 in “Proceedings of the National Academy of Sciences of the United States of America”

Changes in keratin make hair follicles stiffer.

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