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Research Papers

Thermomechanical Analysis of Epidermal Electronic Devices Integrated With Human Skin

[+] Author and Article Information
Yuhang Li

Institute of Solid Mechanics,
Beihang University (BUAA),
Beijing 100191, China;
Key Laboratory of Soft Machines and Smart
Devices of Zhejiang Province,
Zhejiang University,
Hangzhou 310027, China;
State Key Laboratory of Digital Manufacturing
Equipment and Technology,
Huazhong University of Science and Technology,
Wuhan 430074, China

Jianpeng Zhang, Yufeng Xing

Institute of Solid Mechanics,
Beihang University (BUAA),
Beijing 100191, China

Jizhou Song

Key Laboratory of Soft Machines and Smart
Devices of Zhejiang Province,
Zhejiang University,
Hangzhou 310027, China;
Department of Engineering Mechanics and Soft
Matter Research Center,
Zhejiang University,
Hangzhou 310027, China
e-mail: jzsong@zju.edu.cn

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received August 9, 2017; final manuscript received August 18, 2017; published online September 12, 2017. Editor: Yonggang Huang.

J. Appl. Mech 84(11), 111004 (Sep 12, 2017) (7 pages) Paper No: JAM-17-1435; doi: 10.1115/1.4037704 History: Received August 09, 2017; Revised August 18, 2017

Epidermal electronic devices (EEDs) are very attractive in applications of monitoring human vital signs for diagnostic, therapeutic, or surgical functions due to their ability for integration with human skin. Thermomechanical analysis is critical for EEDs in these applications since excessive heating-induced temperature increase and stress may cause discomfort. An axisymmetric analytical thermomechanical model based on the transfer matrix method, accounting for the coupling between the Fourier heat conduction in the EED and the bio-heat transfer in human skin, the multilayer feature of human skin and the size effect of the heating component in EEDs, is established to study the thermomechanical behavior of the EED/skin system. The predictions of the temperature increase and principle stress from the analytical model agree well with those from finite element analysis (FEA). The influences of various geometric parameters and material properties of the substrate on the maximum principle stress are fully investigated to provide design guidelines for avoiding the adverse thermal effects. The thermal and mechanical comfort analyses are then performed based on the analytical model. These results establish the theoretical foundation for thermomechanical analysis of the EED/skin system.

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References

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Figures

Grahic Jump Location
Fig. 1

(a) An EED consisting of temperature sensors and heaters on a skin in a twisting motion (Reproduced with permission from Webb et al. [2]. Copyright 2013 by Nature Publishing Group.) and (b) schematic diagram of the cross-sectional structure for the EED/skin system.

Grahic Jump Location
Fig. 2

(a) The distribution of the temperature increase along the radial direction at the EED/skin interface and (b) the distribution of the temperature increase along the thickness direction with r = 0

Grahic Jump Location
Fig. 3

The distribution of the maximum principle stress at the EED/skin interface along the radial direction

Grahic Jump Location
Fig. 4

(a) The influences of the thermal conductivity and thickness of the substrate on the maximum principle stress σmax at the EED/skin interface and (b) the influences of the Young’s modulus and thermal expansion coefficient of the substrate on the maximum principle stress σmax at the EED/skin interface

Grahic Jump Location
Fig. 5

(a) The maximum temperature increase and (b) the maximum principle stress σmax at the EED/skin interface varies with the size of heating component and the substrate thickness

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