Experimental Investigation of Dynamic Characteristics of Metal Coated Buckled Micro-Beams with Electrothermal Modulation of Residual Stress

Behera, AR and Shaik, H and Rao, GM and Pratap, R (2018) Experimental Investigation of Dynamic Characteristics of Metal Coated Buckled Micro-Beams with Electrothermal Modulation of Residual Stress. In: 4th IEEE International Conference on Emerging Electronics, ICEE 2018, 17 - 19 December 2018, Bengaluru.

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Abstract

Buckled beams show interesting dynamic behaviour due to geometric nonlinearities present in them. They present a novel platform for study of nonlinear phenomena. Since the buckled deflection is governed by the magnitude of residual stress present in the beam, incorporating a provision for tweaking the state of stress can facilitate experimental investigation of nonlinear behaviour. In this work, we use metal-coated, buckled, micromechanical beams as the structural platform and by applying an appropriate voltage to the thin metal layer, we alter their state of stress. We measure the natural frequencies of the beam at each applied voltage and study how the frequencies evolve with change in the resulting residual stress. As the applied voltage increases, the first and second natural frequency shift close to each other and a crossover occurs between them. Near the crossover point, the mode shapes are distorted as a result of modal interactions.

Item Type:	Conference Paper
Publication:	2018 4th IEEE International Conference on Emerging Electronics, ICEE 2018
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	Metal coatings; Natural frequencies; Residual stresses, Dynamic characteristics; Experimental investigations; Fixed-fixed beams; Geometric non-linearity; Modal interactions; Natural frequency shift; Non-linear vibrations; Nonlinear behaviours, Buckling
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	29 Jul 2022 12:16
Last Modified:	29 Jul 2022 12:16
URI:	https://eprints.iisc.ac.in/id/eprint/75071

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