Topic of the Speech: Smart Textiles for in Situ Monitoring of Composites

Professor Vladan Koncar ENSAIT, University of Lille France

Professor Vladan Koncar is Professor at ENSAIT (Ecole Nationale Supérieure des Arts et Industries Textiles) textile engineering institute in Roubaix, France. He obtained his PhD in 1991 at the University of Lille 1 in Villeneuve d’Ascq, France in the field of multirate control of com- plex systems.

From November 2009 to November 2015 he was Head of Research at ENSAIT and Director of GEMTEX research laboratory. Professor Koncar was AUTEX (Association of Universities for Textiles, www.autex.org) President from June 2007 to June 2010.

He has been promoted Doctor Honoris Causa of the University of Iasi, Romania in January 2010. Professor Koncar was Scientific coordinator and coordinator of Large Scale EU Integrated Pro- jects in FP7 and Horizon 2020 and Coordinator of National (French) research projects.

He served as a Chairman of 7 International Scientific Conferences and is member of numerous Editorials Boards of Scientific Journals.

Professor Koncar is author of more than 250 scientific articles (ISI Web of science referred, book chapters, conference proceedings and patents).

ABSTRACT SUBMISSION -FOR INVITED SPEAKER ONLY

Smart Textiles for in Situ Monitoring of Composites Vladan Koncar* ENSAIT GEMTEX, 2, Allée Louise et Victor Champier, 59100 Roubaix, France *Presenter’s email: vladan.koncar@ensait.fr Abtr ABSTRACT (NO MORE THAN 500 WORDS:) Materials such as metals, optical fibres and conductive polymers may be directly integrated into the 2D or 3D textile structures, thus supplying electrical conductivity, sensing capability and data transmission capability to the material. Electronic components, such as electrodes, antennas, transmission lines or heating elements require electro conductive yarns to increase textile compatibility. In recent years, conductive and semi conductive polymers and textile products have been considered for electromagnetic shielding (EMI) and anti-electrostatic purposes, heating, transport of electrical signals, transistors etc. in various applications for the electronic and defence industries. This is mainly due to their desirable properties in terms of electrostatic discharge, radio frequency interference protection, thermal expansion matching and weight. Electro conductive yarns must satisfy the electric characteristics requirements of textile (resistance, capacitance, inductance) and physical characteristics (tensile strength, extensibility). The conductive fibres may be transformed in textile structures by weaving, knitting or other manufacturing processes. Textile fibres are typical examples of electrical insulators. They do not permit the flow of electric current through them. However, for certain technical applications it is essential to use fibres with a considerable electrical conductivity. For textile reinforced composites, one possible solution is to use intelligent textile materials and structures, which provide a real possibility for on line and in situ monitoring of structural integrity. Such intelligent materials are made by coating or treating textile yarns, filaments, or fabrics with nanoparticles or conductive and semi conductive polymers, giving them specified performance. In this presentation novel textile sensors are introduced aiming at: - monitoring of composite structures in real time in situ; - composite manufacturing processes monitoring, such as stamping and weaving of reinforcements (multi layer, 3D etc.), - monitoring of the infusion process for thermoset composites and thermo consolidation process for thermoplastic composite structures. Main contributions of this presentation, about the scope of the researches, are quoted below: - Introduction to the development of fibrous sensors based on smart textile materials adapted to structural health monitoring in real time in situ of composite structures to achieve the concept of predictive maintenance; - Development of specific textile sensors adapted to the monitoring of composite manufacturing and set up processes such as textile reinforcement production, stamping process and infusion process; - Introduction and classification of composite structures using reinforcement realized by textile manufacturing processes such as weaving, knitting, braiding, and hybrid processes; - Structural Health Monitoring (SHM) of composites, including health monitoring definitions, State of the art of traditional monitoring technics, Characterisation of textile sensors before insertion in textile preforms, Mechanical stress response of textile sensors, Interface phenomena of textile sensors and related textile reinforced thermoplastic composites, etc. - Structural Health Monitoring of processes related to composite manufacturing, weaving, braiding, infusion process, etc. This section contains three study cases to better explain our approach to specific applications.