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Printed piezoresistive strain sensors for monitoring of light-weight structures

Rausch, Jacqueline and Salun, Larisa and Griesheimer, Stefan and Ibis, Mesut and Werthschützky, Roland (2011):
Printed piezoresistive strain sensors for monitoring of light-weight structures.
In: SENSOR & TEST Conference, Nürnberg, 07.-09.06.2011, [Conference or Workshop Item]

Abstract

In this paper we present the design and test of printed strain sensors, which can be integrated in lightweight structures for monitoring purposes. We focus on composite structures consisting of a metal substrate and insulating and conductive ink layers for sensing normal strain at the surface. Both, inkjet and screen printing technology are used to realize resistive topologies. In a first step, we analyze electrical properties of functional inks: electrical impedance and breakdown electrical field strength in case of insulation inks, resistance in case of conducting inks. Silver and PEDOT:PSS based suspensions are printed as sensing layer. To determine the resistance change due to plastic deformation of the metal substrate, tensile tests are performed up to 30% strain and subsequent resistance change is measured. In a second step, the sensing effect of printed conductive structures is investigated. Resistive sensing topologies are designed for detecting longitudinal and transversal normal strain. Meander structures, which form single resistors as well as bridge configurations, are printed on test specimens and analyzed in a four-point bending set up. Performing loading and unloading cycles, gauge factor, cross sensitivity, nonlinearity and hysteresis error of the sensors are measured.

Item Type: Conference or Workshop Item
Erschienen: 2011
Creators: Rausch, Jacqueline and Salun, Larisa and Griesheimer, Stefan and Ibis, Mesut and Werthschützky, Roland
Title: Printed piezoresistive strain sensors for monitoring of light-weight structures
Language: English
Abstract:

In this paper we present the design and test of printed strain sensors, which can be integrated in lightweight structures for monitoring purposes. We focus on composite structures consisting of a metal substrate and insulating and conductive ink layers for sensing normal strain at the surface. Both, inkjet and screen printing technology are used to realize resistive topologies. In a first step, we analyze electrical properties of functional inks: electrical impedance and breakdown electrical field strength in case of insulation inks, resistance in case of conducting inks. Silver and PEDOT:PSS based suspensions are printed as sensing layer. To determine the resistance change due to plastic deformation of the metal substrate, tensile tests are performed up to 30% strain and subsequent resistance change is measured. In a second step, the sensing effect of printed conductive structures is investigated. Resistive sensing topologies are designed for detecting longitudinal and transversal normal strain. Meander structures, which form single resistors as well as bridge configurations, are printed on test specimens and analyzed in a four-point bending set up. Performing loading and unloading cycles, gauge factor, cross sensitivity, nonlinearity and hysteresis error of the sensors are measured.

Title of Book: SENSOR & TEST Conference
Divisions: 16 Department of Mechanical Engineering > Institute of Printing Science and Technology (IDD)
16 Department of Mechanical Engineering > Institut für Produktionstechnik und Umformmaschinen (PtU)
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Measurement and Sensor Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
16 Department of Mechanical Engineering
18 Department of Electrical Engineering and Information Technology
Event Location: Nürnberg
Event Dates: 07.-09.06.2011
Date Deposited: 22 Aug 2011 16:22
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