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    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Dmitry Rychkov, Wang, J.

    Influence of Charge Density on Charge Decay in Chemically Modified Polypropylene Films

    Proceedings of the IEEE 2nd International Conference on Dielectrics, Budapest, Hungary

    2018

    ISBN: 978-1-5386-6389-9

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    F. He, Gerhard, R., Schulze, M., Wirges, W., Dmitry Rychkov, Wang, J.

    Senskin deformable silicone-elastomer sensors for structural health monitoring: assessment of strain sensitivity and correction for thermal expansion

    Proceedings of the 8th International Conference on Electromechanically Active Polymer (EAP) Transducers & Artificial Muscles , Valpré Ecully - Lyon, France

    2018

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    F. He, G. Gidion, Gerhard, R., Schulze, M., Wirges, W., Dmitry Rychkov, Wang, J.

    Soft Stretchable All-Silicone Sensor for Transport-Infrastructure Monitoring

    Sensoren und Messsysteme 2018 19. ITG-/GMA-Fachtagung

    2018

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Kuznetsov, A., Dmitry Rychkov, V. Stojharov, Rychkov, A. A.

    The Influence of Recrystallization Regimes on Electret Charge Stability in Low-Density Polyethylene Films

    Proceedings of the IEEE 2nd International Conference on Dielectrics, Budapest, Hungary

    2018

    ISBN: 978-1-5386-6389-9

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Zeitschriftenartikel

    Damigos, Y., Kourousis, D., Frankenstein, B., Gerhard, R., Amditis, A., Cheilakou, E., Dmitry Rychkov, Bouklas, C., Tsopelas, N., Anastasopoulos, A.

    Strain monitoring system for steel and concrete structures

    Procedia Structural Integrity, vol. 10, pp. 25-32

    2018

    DOI: 10.1016/j.prostr.2018.09.005

    Abstract anzeigen

    The present work is part of a collaborative H2020 European funded research project called SENSKIN, that aims to improve Structural Health Monitoring (SHM) for transport infrastructure through the development of an innovative monitoring and management system for bridges based on a novel, inexpensive, skin-like sensor. The integrated SENSKIN technology will be implemented in the case of steel and concrete bridges, and tested, field-evaluated and benchmarked on actual bridge environment against a conventional health monitoring solution developed by Mistras Group Hellas. The main objective of the present work is to implement the autonomous, fully functional strain monitoring system based on commercially available off-the-shelf components, that will be used to accomplish direct comparison between the performance of the innovative SENSKIN sensors and the conventional strain sensors commonly used for structural monitoring of bridges. For this purpose, the mini Structural Monitoring System (mini SMS) of Physical Acoustics Corporation, a comprehensive data acquisition unit designed specifically for long-term unattended operation in outdoor environments, was selected. For the completion of the conventional system, appropriate foil-type strain sensors were selected, driven by special conditioners manufactured by Mistras Group. A comprehensive description of the strain monitoring system and its peripheral components is provided in this paper. For the evaluation of the integrated system’s performance and the effect of various parameters on the long-term behavior of sensors, several test steel pieces instrumented with different strain sensors configurations were prepared and tested in both laboratory and field ambient conditions. Furthermore, loading tests were performed aiming to validate the response of the system in monitoring the strains developed in steel beam elements subject to bending regimes. Representative results obtained from the above experimental tests have been included in this paper as well.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Zeitschriftenartikel

    Dmitry Rychkov, Altafim, R.A.P.

    Template-based fluoroethylenepropylene ferroelectrets with enhanced thermal stability of piezoelectricity

    Journal of Applied Physics, vol. 124, no. 17

    2018

    DOI: 10.1063/1.5041374

    Abstract anzeigen

    In ferroelectrets, the piezoelectricity stems from the charges of both polarities trapped on the inner surfaces of the cavities in the material, so that its thermal stability is defined by the stability of the respective charges. In the present work, a template-based lamination technique has been employed to fabricate tubular-channel ferroelectrets from fluoroethylenepropylene (FEP) films. It has been shown that the piezoelectricity in FEP ferroelectrets decays at relatively low temperatures due to the inherently lower thermal stability of the positive charge. In order to improve charge trapping, we have treated both FEP films and inner surfaces of the ferroelectret cavities with titanium-tetrachloride vapor, using the atomic-layer-deposition technique. Using surface-potential-decay measurements on FEP films, we have found that the charge-decay curves shift by more than 100 ∘C to the higher temperatures as a result of the surface treatment. Direct measurements of piezoelectric d33 coefficients as a function of temperature have shown that the piezoelectric stability is likewise improved with the d33-decay curves shifted by 60 ∘C to the right. The improvement of electret/ferroelectret properties can be attributed to the formation of the deeper traps on the chemically modified FEP surface. SEM micrographs and EDS analysis reveal island-like structures with titanium- and oxygen-containing species that can be responsible for the deeper trapping of the electret charges.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Zeitschriftenartikel

    Gerhard, R., Kuznetsov, A., Dmitry Rychkov, Rychkov, A. A.

    Influence of Charge Density on the Trap-Energy Spectrum in Fluoroethylenepropylene Copolymer Films with Chemically Modified Surfaces

    IEEE Transactions on Dielectrics and Electrical Insulation, vol. 25, no. 3, pp. 840-844

    2018

    DOI: 10.1109/TDEI.2018.007437

    Abstract anzeigen

    Tetrafluoroethylene-hexafluoropropylene copolymer (FEP) films were treated with titanium-tetrachloride vapor by means of molecular-layer deposition. The treatment leads to considerable improvements of the electret-charge stability on positively charged films. A slight improvement is also observed for negatively charged films. In line with our previous findings, we attribute the improvement in electret properties to the formation of deeper traps on the chemically modified polymer surfaces. Here, we investigate the influence of the charge density on electret stability of FEP films with modified surfaces. Trap-energy spectra obtained from thermally-stimulated-discharge measurements indicate that the charge stability on modified FEP films depends on how the surface traps are populated and on the availability of additional deeper traps.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Qiu, X., Wirges, W., Dmitry Rychkov

    Pressure dependence of the piezoelectric d33 coefficient and the cellular-foam structure in polypropylene ferro- and piezoelectrets

    Proceedings of the 16th International Symposium on Electrets, Leuven, Belgium

    2017

    ISBN: 978-90-8649-798-0

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Dmitry Rychkov, Q. Nguyen, Wang, J.

    Piezoelectrically generated Pressure Steps (PPS) for studying charge distributions on corona-charged Polypropylene (PP) films

    Proceedings of the 16th International Symposium on Electrets, Leuven, Belgium

    2017

    ISBN: 978-90-8649-798-0

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Dmitry Rychkov, Wang, J.

    Influence of foreign chemical structures from nitric acid treatment on electret and electrical-insulation properties of polypropylene

    Proceedings of the 16th International Symposium on Electrets, Leuven, Belgium

    2017

    ISBN: 978-90-8649-798-0

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Kuznetsov, A., Dmitry Rychkov, Rychkov, A. A.

    Trap-energy spectrum in corona-charged polytetrafluoroethylene (PTFE) electret films with modified surfaces

    Proceedings of the 16th International Symposium on Electrets, Leuven, Belgium

    2017

    ISBN: 978-90-8649-798-0

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Schulze, M., Dmitry Rychkov

    Soft Capacitive Sensors for Structural Health Monitoring

    Proceedings of the 14th International Conference “Dielectrics 2017"

    2017

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Zeitschriftenartikel

    Damigos, Y., Tsaoussidis, V., Frankenstein, B., Brady, K., Lenas, S.-A., Loupos, K., Gerhard, R., Schulze, M., Amditis, A., Malliou, C.M., Wirges, W., Dmitry Rychkov, Chatziandreoglou, C.

    Structural health monitoring system for bridges based on skin-like sensor

    IOP Conference Series: Materials Science and Engineering, vol. 236, no. Proceedings of BESTInfra2017 - Building up Efficient and Sustainable TransportInfrastructure 2017

    2017

    DOI: 10.1088/1757-899X/236/1/012100

    Abstract anzeigen

    Structural health monitoring activities are of primal importance for managing transport infrastructure, however most SHM methodologies are based on point-based sensors that have limitations in terms of their spatial positioning requirements, cost of development and measurement range. This paper describes the progress on the SENSKIN EC project whose objective is to develop a dielectric-elastomer and micro-electronics-based sensor, formed from a large highly extensible capacitance sensing membrane supported by advanced microelectronic circuitry, for monitoring transport infrastructure bridges. Such a sensor could provide spatial measurements of strain in excess of 10%. The actual sensor along with the data acquisition module, the communication module and power electronics are all integrated into a compact unit, the SENSKIN device, which is energy-efficient, requires simple signal processing and it is easy to install over various surface types. In terms of communication, SENSKIN devices interact with each other to form the SENSKIN system; a fully distributed and autonomous wireless sensor network that is able to self-monitor. SENSKIN system utilizes Delay-/Disruption-Tolerant Networking technologies to ensure that the strain measurements will be received by the base station even under extreme conditions where normal communications are disrupted. This paper describes the architecture of the SENSKIN system and the development and testing of the first SENSKIN prototype sensor, the data acquisition system, and the communication system.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Zeitschriftenartikel

    Gerhard, R., Dmitry Rychkov, Wang, J.

    Chemical modification with orthophosphoric acid enhances surface-charge stability on polypropylene electrets

    Applied Physics Letters, vol. 110, no. 19

    2017

    DOI: 10.1063/1.4983348

    Abstract anzeigen

    The low surface-charge stability of polypropylene (PP) frequently limits its application as an electret material. In this paper, we demonstrate how the treatment of PP-film surfaces with orthophosphoric acid (H3PO4) enhances their charge stability. To discriminate between the effects of chemical modification and thermal treatment, as-received and annealed PP films are used as reference samples. The electret properties of treated and non-treated PP films are characterized with thermally stimulated discharge (TSD) and isothermal surface-potential decay (ISPD) experiments, from which considerable improvement in thermal and temporal charge stability is observed for samples modified with H3PO4. The half-value temperature (T1∕2) observed on TSD curves of chemically treated PP increases to 131 and 145 °C for positive and negative charges, respectively. The enhancement might be attributed to the phosphoric compounds detected on the H3PO4-modified surfaces via attenuated-total-reflection infrared spectroscopy. Deeper surface traps formed at the “foreign” phosphorus-containing structures are able to capture the charges over longer time periods and at higher temperatures, thus leading to significant improvements in the temporal and thermal surface-charge stabilities of PP electrets.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Damigos, Y., V. Kalidromitis, S. Camarinopoulos, Frankenstein, B., Loupos, K., A. Tsertou, Gerhard, R., Amditis, A., Anastasopoulos, S. Lenas, K. Lenz, S. Schneider, M. Hill, Wirges, W., Dmitry Rychkov, A. Adesiyun, V. Tsaoussidisa

    Skin-like Sensor Enabled Bridge Structural Health Monitoring System

    Proceedings of the 8th European Workshop On Structural Health Monitoring (EWSHM 2016), Bilbao, Spain

    2016

    Abstract anzeigen

    Structural Health Monitoring (SHM) has an important role in the management of transport infrastructure. However, most SHM techniques are based on data obtained from dense networks of point-based sensors (rather than sparse networks of spatial sensors) and so, inrelative terms, they are costly to implement. Most commercially available strain sensors have a limited maximum range - typically 1% to 2% - and are not well-suited to providing information of a severe loss of structural integrity. The SENSKIN project develops a dielectric-elastomer and micro-electronics-based skin-like sensor, based on the use of a largehighly extensible capacitance sensing membrane and advanced micro-electronic circuitry, for monitoring transport infrastructure - such as bridges. The sensor will provide spatial measurements of strain of more than 10% and is being designed to (a) require low power to operate, (b) be easy to install (c) have a comparable or lower cost than conventional strain sensors, (d) allow simple signal processing, and (e) have the ability to self-monitor and self-report. The system will support the new and emerging technology of Delay/Disruption-Tolerant Networking to secure that strain measurements acquired will reach the base station even under extreme conditions where communications may be disrupted. SENSKIN also develops a Decision-Support-System (DSS) for proactive condition-based structural interventions under normal operating conditions and reactive emergency intervention following an extreme event. In assessing potential rehabilitation options, the DSS will use the data supplied by the SENSKIN sensors together with advanced structural analysis models, whilst taking account of the lifecycle economic, social and environmental implications. The overall monitoring system will be evaluated and benchmarked on actual bridges of Egnatia Highway (Greece) and Bosporus Bridge (Turkey). This paper describes the concept and principles of the SENSKIN sensing system, and its various components with attention to end-user requirements, specifications and system architecture.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Dmitry Rychkov, Wang, J.

    Influence of surface modifications with orthophosphoric acid on the charge stability of polypropylene electrets

    IEEE Annual Report Conference on Electrical Insulation and Dielectric Phenomena (2016 IEEE CEIDP)

    2016

    ISBN: 978-1-5090-4654-6

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Dmitry Rychkov, Altafim, R.A.P.

    Polymer Electrets and Ferroelectrets as EAPs: Models" Book chapter in "Electromechanically Active Polymers

    Electromechanically Active Polymers, Cham

    2016

    ISBN: 978-3-319-31767-0

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Kuznetsov, A., Dmitry Rychkov, Rychkov, A. A.

    Energy Spectrum of Surface Traps on Teflon-FEP Films Modified with Titanium-Tetrachloride Vapor

    Proceedings of the ICD 2016 1st International Conference on Dielectrics, Montpellier, France

    2016

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Gerhard, R., Kuznetsov, A., Dmitry Rychkov, Rychkov, A. A.

    Modelling the Isothermal Charge Decay of Modified PTFE Electrets from their Thermally Stimulated Discharge

    IEEE Annual Report Conference on Electrical Insulation and Dielectric Phenomena (2016 IEEE CEIDP)

    2016

    ISBN: 978-1-5090-4654-6

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Qiu, X., Wirges, W., Dmitry Rychkov

    Properties and Applications of Ferroelectrets

    The Nano-Micro Interface, Weinheim, vol. Vol. 1

    2015

    ISBN: 978-3-527-33633-3