Plenary Lecture

Mechanical Design of Electrical Routing on Stretchable Substrate

Professor Hong Hocheng
Co-author: C.-M. Chen
Department of Power Mechanical Engineering
National Tsing Hua University
Hsinchu, Taiwan
E-mail: hocheng@pme.nthu.edu.tw

Abstract: Stretchable electrical devices, unlike solid and flexible electrical devices, possess high mechanical stretchability in plane that are essentally advantageous for innovative biomedical and textile applications. In last ten years, the design development of mechanics for stretchable electronics has been dedicated to solve for two problems: improving the conductivity while increasing the strain tolerance of the electrical routing. According to the adopted routing geometry and fabrication process, various designs can be divided into five patterns: straight; wavy; wrinkly; bridge-like; and conductive-elastomeric. The geometric function of a specified routing form can be analyzed by finite element simulation and the experimental tensile test. The authors find that the strain limit at wire-breaking is determined by width-to-radius ratio, route angle and wire thickness. Larger angle and thickness with lower width-to-radius ratio provide higher strain limit. The influences are examined and a mathematical function predicting the maximum strain is derived. Furthermore, a fabrication method incorporating the pre-strainis is proposed, that supplies higher stretchability for the electrical routing.

Brief Biography of the Speaker: Professor H. Hocheng earned his Diplom-Ing. from Technische Hochschule at Aachen and Ph.D. from University of California at Berkeley in mechanical engineering. He has been University Chair Professor at National Tsing Hua University. He received numerous national and international research awards and are Fellows of ASME and AMME. His research interest lies in the area of innovative materials processing technoogy.

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