Showing papers by "Matt Pharr published in 2016"
TL;DR: In this article, the authors measured the stresses that develop in sputter-deposited amorphous Ge thin films during electrochemical lithiation and delithiation, and determined the fracture energies are Γ = 8.0 ǫm−2 for a-Li 0.3Ge and Γ ǔ = 5.6 Ôm−1 for a -Li 1.6Ge.
64 citations
TL;DR: A mechanics model is developed for the encapsulated piezoelectric thin-film actuators/sensors system imperfectly bonded to the human skin to simultaneously determine the Young's moduli of the epidermis and dermis as well as the thickness of epidermal thickness.
Abstract: A mechanics model is developed for the encapsulated piezoelectric thin-film actuators/sensors system imperfectly bonded to the human skin to simultaneously determine the Young's moduli of the epidermis and dermis as well as the thickness of epidermis.
17 citations
TL;DR: This paper studies designs for stretchable electronics that resist failure from impacts due to incorporation of a viscoelastic encapsulation layer, and shows that a commercially available, low modulus silicone material offers viscous properties that make it a good candidate as the encapsulations layer forStretchable electronics.
Abstract: Stretchable electronics offer soft, biocompatible mechanical properties; these same properties make them susceptible to device failure associated with physical impact. This paper studies designs for stretchable electronics that resist failure from impacts due to incorporation of a viscoelastic encapsulation layer. Results indicate that the impact resistance depends on the thickness and viscoelastic properties of the encapsulation layer, as well as the duration of impact. An analytic model for the critical thickness of the encapsulation layer is established. It is shown that a commercially available, low modulus silicone material offers viscous properties that make it a good candidate as the encapsulation layer for stretchable electronics.
12 citations