Structural Health Monitoring of Fiber Reinforced Plastics Strukturüberwachung von Faserkunststoffverbunden
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1 Structural Health Monitoring of Fiber Reinforced Plastics Strukturüberwachung von Faserkunststoffverbunden A. Nocke, E. Haentzsche, G. Bardl, Ch. Cherif Institute of Textile Machinery and High Performance Material Technology, Technische Universität Dresden Sensorsysteme 2014, Lichtenwalde
2 Outline 1. Initial Situation & Motivation 2. Goals & Approach 3. Results I. Functional model 1 - Textile membrane for biogas storage facilities II. Functional model 2 - FRP wind turbine blade 4. Conclusions & Outlook slide 2
3 1. Initial Situation & Motivation Substitution of classic construction materials by increasing usage of FRP s in multiple application areas Investigation 09/2013: = kg Annual production output in 10 6 kg Carbon Composites e.v SMC, BMC Open Mould RTM Continuous Processing (pulltrusion, sheets) Winding, Casting Hybrid Prepreg: GMT, LFT, SFT Others Investigation 09/2013: 08/2009: = kg kg SMC, BMC Annual production output in in kg kg Open Mould Early prediction of saftey critical structural degradations in textile reinforcement RTM structure of FRP s becomes Continuous essential Processing (pulltrusion, sheets) Winding, Casting Reliability requires structural-healthmonitoring techniques (in-situ sensor Carbon Composites e.v. systems) 2014 Hybrid-Prepreg: GMT, LFT, SFT Others Federation of German Wind- Energy 2014 MEHLER TEXNOLOGIES GMBH 2009 BAM, Dept. Chemical Safety Engineering, Dr. Th. Schendler 2011 German Wind Energy Association 2014 slide 3
4 2. Goals & Approach Long-term stable structuremonitoring and damage detection for FRP s Textile-technological realization of tailored & structure-compatible sensor networks Cost- and time effective usage of textile-technological fabric generating techniques Multiaxial weaving Multiaxial knitting Integration of piezo-resistive materials during textile fabric s production (multiaxial weaving and warp knitting) Membrane with textile strain sensors FRP wind turbine blade with textile sensors slide 4
5 2. Goals & Approach Strain measurement principle Piezo-resistive effect of CF by mechanical straining; geometry change causes change in resistance R R 0 F A E 0 II k l k l expan CF-Roving Toho Tenax -J HTA40 1k 67 tex 15S U R 1 U I 0 0 slide 5
6 2. Goals & Approach Factors of influence on the sensory characteristics: carbon filament yarn (CFY) elasticity Toho Tenax HTA40 1k 67tex (E II = 238 GPa) resistivity coupling agents or rather filament sizing Performance of CF based strain sensors in FRTP Filament-matrix interface filament-matrix adhesion interaction with functional groups of matrix and/or filament infiltration ability of the matrix (polymer/pressure/temperature) Sensor embedding (crimp) textile technique related crimp in the reinforcement structure of the FRTP Sensor alignment to the major stress direction deflection between major stress direction and measuring direction HAENTZSCHE et. al.: Characteristics of CF-based strain sensors for SHM.... In: Sensors and Actuators A: Physical A203(2013)1, pp slide 6
7 Overview Functional models Membrane for biogas storage facilities FRP wind turbine blade Zorg Biogas 2014 Multiaxial weaving with ORW technology & warp yarn shogging Rheinenergie 2013 Multiaxial warp knitting with warp yarn shogging device Functional model 1 (FUM1) Functional model 2 (FUM2) slide 7
8 3. Results (FUM1) 3.1 Specification of textile reinforced membranes for biogas storage facilites SATTLER AG 2014 Conventional sensor layouts Woven sensor layouts Basic structure: single-layer woven fabric Dimensioning of sensor structure: 2D layouts with reachable basic resistances R 0 = ( ) Ω Usage of CF as warp & weft yarns and for additional warp yarn shogging CF trassing in 0 direction to serial interface on membrane s geometrical periphery VISHAY Precision Group, Inc slide 8
9 3. Results (FUM1) 3.2 Sensor integration by weaving with ORW technology Multiple warp yarn shogging device Lateral move = ± 150 mm working width = 1,035 mm Basic fabric: x PES dtex, plain weave warp/weft density: 10/9 cm -1 Sensor material: CF 1k; 67 tex Detail A: linear drive unit with needle bar and Open Reed Weave (ORW ) Detail B: needle bar with CFY in open shed position slide 9
10 3. Results (FUM1) 3.3 Manufacturing of membranes with integrated CF sensors Woven fabric 200x200 mm², Meandering CF sensors with R Ω Hand lamination with 2C silicone rubber 2-layer laminat [-90 CF, 0, 90 ] 2 with 2 meanders in 0 /90 direction slide 10
11 3. Results (FUM1) 3.4 Sensor behaviour during cyclical in-plane shear stressing ,0 0,9 0,8 shearing angle tensile force F change in resistance R/R 0,5 0,4 Membran s relaxation measured with load cell tensile force F [N] shearing angle [deg] 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0,0-0,1-0,2-0, time t [s] Stress-depending sensor signal of CF strain sensor (WHEATSTONE bridge) integrated in GF reinforced VMQ membrane 0,3 0,2 0,1 0,0 change in resistance R/R [%] Membrane s transient strain measured with integrated CF sensors slide 11
12 Overview Functional models Membrane for biogas storage facilities FRP wind turbine blade Zorg Biogas 2014 Multiaxial weaving with ORW technology & warp yarn shogging Rheinenergie 2013 Multiaxial warp knitting with warp yarn shogging device Functional model 1 (FUM1) Functional model 2 (FUM2) slide 12
13 3. Results (FUM2) 3.5 Specification of textile reinforced small wind turbine blade Design and composite construction of small wind turbine blade Half shell segments with tension and compression flanges (no main beam) Accumulated strain measurement along integrated CF sensor s length slide 13
14 3. Results (FUM2) 3.6 Adaption multiaxial warp knitting technique for 2D sensor integration Patended warp yarn shogging device for multiaxial warp knitting machines GF Triax NCF [0, +45, -45 ] for blade s tensile flanges with integrated CF sensors shogging device - laying head warp yarns (0 ) warp yarn shogging devices GF Biax NCF [+45, -45 ] for blade s half shells Sensor material: CF course-oriented linkage of sensor & NCF Knitting area weft yarn systems (90 ) slide 14
15 3. Results (FUM2) 3.7 Final assembly of small wind turbine blade Detail: CF sensor aligning FRP wind turbine blade Detail: Electrical contacting within blade s root Blade Electrical with contacting integrated (I) Pre-cut & VAP Infiltration & CF sensor system for spatially Drapery (II) Curing (III) resolved strain measurement slide 15
16 3. Results (FUM2) 3.8 Rotor resistance change under constant loading change in resistance [%] 0,11 0,09 0,07 0,05 70 N load 50 N load 30 N load 0,03 0,01-0, rotor length [mm] slide 16
17 4. Conclusion & Outlook Realization of 2 functional FRP models: wind turbine blade and membrane with integrated CF sensors for SHM Good correlation between mechanical stress and measured change in resistance Outlook: Measurements under biaxial and dynamic loading scenarios slide 17
18 5. Appropriation of funds The IGF project 17529BR/1 of the Forschungsvereinigung Forschungskuratorium Textil e. V is funded through the AiF within the program for supporting the Industriellen Gemeinschaftsforschung (IGF) from funds of the Federal Ministry of Economics and Energy (BMWi) by a resolution of the German Bundestag. The ITM would like to thank all the mentioned institutions for providing funds. slide 18
19 6. Acknowledgment We would like to thank all members of the committee accompanying the project IGF17529BR/1 for their technical support and the provision of test materials. Last but not least, many thanks to all of our colleagues and students (Mr. cand. Ing. Ralf Müller) for their support within the context of our research in this application area. slide 19
20 Fakultät Maschinenwesen Institut für Textilmaschinen und Textile Hochleistungswerkstofftechnik, Professur für Textiltechnik MULTIFUNCTIONAL FIBER-REINFORCED PLASTICS WITH INTEGRATED TEXTILE-BASED SENSOR AND ACTUATOR NETWORKS Dr.-Ing. Andreas Nocke Research group Measurement and sensor technology Technische Universität Dresden Thank you very much for your Professorship of Textile Technology attention Institute for Textile Machinery and High Performance Material Technology Tel.: +49 (0)
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