158. viscoelastic response of pig skin under tension - a macroscopic approach using image processing techniques

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Graduate Program in Materials Science and Engineering
Faculty Advisor(s): Marc A. Meyers

Primary Student
Name: Andrei Pissarenko
Email: apissare@ucsd.edu
Phone: 858-291-2579
Grad Year: 2020

Student Collaborators
Andrei Pissarenko, apissare@eng.ucsd.edu

Abstract
Skin is the outermost layer of our bodies, as well as the second largest organ after the skeleton. It acts as a first protective barrier against external agents such as heat, light, infection, and injury. Skin carries a vast network of nerves, glands and vessels that enable sensing of heat, touch, pressure and pain, and is also a crucial interface that regulates our body temperature and stores water and lipids in order to maintain a healthy metabolism. In order to fulfill such a broad range of functions throughout an individual?s life, skin must be able to withstand and recover from tremendous deformations as well as mitigate tear propagation that can occur during growth, movement, and potential injuries that affect its integrity. As a result, characterizing the viscoelastic behavior of skin and understanding the underlying mechanisms of deformation at different levels of scale is essential in a large spectrum of applications such as surgery, cosmetics, forensics, biomimicry and engineering of protective gear or artificial grafts, for example. Although a fair amount of research has focused on skin's viscoelastic properties at various structural levels, proposed models often neglect said levels of complexity and lean towards a phenomenological approach rather than a micromechanical model. The present study offers new insight into the macroscale viscoelastic behavior of skin through a series of tensile tests performed on pig skin, a preferred candidate for its similarity to human skin and availability of samples. Different fiber alignments were tested at varying strain rates and stress relaxation was observed. A viscoelastic models are proposed to fit the obtained data.

Industry Application Area(s)
Life Sciences/Medical Devices & Instruments | Materials

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