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CURVED PIEZOELECTRIC DEVICE

United States Patent Application

20160365501
A1
View the Complete Application at the US Patent & Trademark Office
Disclosed is a curved piezoelectric device maximizing an electrical potential of the piezoelectric material corresponding to an external mechanical stress. The curved piezoelectric device includes: a curved substrate; and a piezoelectric material provided on one surface or both surfaces of the curved substrate, wherein when a stress is applied, a neutral plane in which a compressive stress and a tensile stress are balanced is located in the curved substrate, wherein the location of the neutral plane is determined by y.sub.1 and y.sub.2 of Equation 1 or 2 below, and wherein the location of the neutral plane is controllable by adjusting a thickness (d), a sectional area (A) and a Young's modulus (E) of each of the curved substrate and the piezoelectric material: wherein y 1 = E 2 d 2 ( d 1 + d 2 ) 2 ( E 1 d 1 + E 2 d 2 ) , y 2 = E 1 d 1 ( d 1 + d 2 ) 2 ( E 1 d 1 + E 2 d 2 ) and Equation 1 y 1 = E 2 A 2 ( A 1 + A 2 ) 2 ( E 1 A 1 + E 2 A 2 ) , y 2 = E 1 A 1 ( A 1 + A 2 ) 2 ( E 1 A 1 + E 2 A 2 ) . Equation 2 ##EQU00001##
KANG, Chong Yun (Seoul, KR), YOON, Seok Jin (Seoul, KR), KIM, Jin Sang (Seoul, KR), CHOI, Ji-Won (Seoul, KR), BAEK, Seung Hyub (Seoul, KR), KIM, Seong Keun (Seoul, KR), JUNG, Woo-Suk (Seoul, KR), KWON, Beomjin (Seoul, KR)
Korea Institute of Science and Technology (Seoul KR)
15/ 158,158
May 18, 2016
DESCRIPTION ABOUT NATIONAL RESEARCH AND DEVELOPMENT SUPPORT [0001] This study was supported by the Energy Technology R&D Project of Ministry Of Trade, Industry & Energy, Republic of Korea (Development and demonstration of Piezoelectric Energy Harvester for using unused energy in road traffic, Project No. 20142020103970) under the Industrial-Academic Cooperation Group of Hanyang University.