TY - JOUR A1 - Kelm, Jürgen A1 - Stark, Wolfgang A1 - Bovtun, V. A1 - Borisov, V. A1 - Yakimenko, Y. T1 - Investigation of Crosslinking Process in Thermosets and Elastomers by Microwave Methods - Basic Study for the Monitoring Method Development JF - Materialprüfung = Materials testing KW - Dielectric parameters KW - Microwave methods KW - Crosslinking KW - Cure KW - Vulcanisation KW - Thermosets KW - Elastomers KW - Monitoring PY - 2000 SN - 0025-5300 PB - Carl Hanser Verlag CY - München AN - OPUS4-1053 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Gorokhovatsky, Y.A. A1 - Krüger, Simone A1 - Brademann-Jock, Kerstin A1 - Stark, Wolfgang A1 - Temnov, Dmitri A1 - Kuvshinova, Oksana A1 - Goldade, V.A. ED - Fleming, R. J. T1 - Thermally stimulated luminescence in LDPE fibers T2 - Proceedings / 11th International Symposium on Electrets (ISE 11) T2 - 11th International Symposium on Electrets (ISE 11) CY - Melbourne, Australia DA - 2002-10-01 PY - 2002 SN - 0-7803-7560-2 SP - 138 EP - 140 PB - IEEE Service Center CY - Piscataway, NJ AN - OPUS4-1654 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stark, Wolfgang A1 - Döring, Joachim A1 - Goering, Harald A1 - Knappe, S. A1 - Mc Hugh, Jarlath A1 - Opfermann, J. T1 - Der RTM-Prozess und die Probleme von Gelierung, Verglasung und Aushärtegrad T2 - Tagungshandbuch der 6. Internationalen AVK-TV Tagung für Verstärkte Kunststoffe und Duroplastische Formmassen T2 - 6. Internationale AVK-TV Tagung für Verstärkte Kunststoffe und Duroplastische Formmassen ; 6th International AVK-TV Conference for Reinforced Plastics and Thermoset Moulding Compounds CY - Baden-Baden, Deutschland DA - 2003-10-07 KW - Epxidharz KW - Compositbauteil KW - Vernetzungsreaktion PY - 2003 VL - 6 SP - C14-1-C14-16 PB - AVK-TV CY - Frankfurt am Main AN - OPUS4-3034 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Fengler, Petra A1 - Stark, Wolfgang A1 - Döring, Joachim A1 - Mc Hugh, Jarlath T1 - Coupling of hidden ultrasound sensors to a moulding tool JF - The e-journal of nondestructive testing & ultrasonics N2 - Ultrasound on-line NDT methods have been demonstrated as a useful tool for monitoring the curing reaction of thermosets. In order to achieve this ultrasound sensors are incorporated into compression, injection and RTM (resin transfer) mould. For many commercial products imprints or any surface markings upon the moulded product are undesirable. Due to its physical properties ultrasound has a large advantage over other techniques for similar applications. The sound wave can pass through the wall of the mould and direct contact with the moulded part is not required. In this particular case one fundamental problem is a good coupling of the sensors to the mould wall. Several mediums came into question but because of the high technical (e. g. temperature and long time stability) and practical demands, it was decided that dry (non-fluid) coupling would be the most promising candidate. A handful of coupling foils suitable also at high temperatures and for long time application under industrial conditions were tested and are presented in this paper. KW - Sensors KW - Ultrasound KW - Mould wall coupling KW - Thermoset manufacturing PY - 2004 UR - http://www.ndt.net/article/v09n03/stark/stark.htm SN - 1435-4934 VL - 9 IS - 3 SP - 1 EP - 10 PB - NDT.net CY - Kirchwald AN - OPUS4-3316 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bovtun, V. A1 - Stark, Wolfgang A1 - Pashkov, V. A1 - Kelm, Jürgen A1 - Yakimenko, Y. T1 - Microwave On-Line Monitoring of Thermoset Curing JF - Materialprüfung = Materials testing PY - 2002 SN - 0025-5300 VL - 44 IS - 7-8 SP - 300 EP - 306 PB - Carl Hanser Verlag CY - München AN - OPUS4-1563 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bovtun, V. A1 - Stark, Wolfgang A1 - Kelm, Jürgen A1 - Porokhonskyy, V. A1 - Yakimenko, Y. T1 - Microwave Dielectric Properties of Rubber Compounds Undergoing Vulcanisation - Part 2. Influence of Carbon Black JF - Kautschuk, Gummi, Kunststoffe (KGK) N2 - The application of microwave measurements to the characterisation of rubber compounds vulcanisation is considered. The behaviour of mechanical and microwave (20 GHz) dielectric parameters during vulcanisation was investigated for rubber compounds with different concentrations of active and non-active carbon black. An increase of concentration or activity of carbon black results in the increase of both dielectric permittivity ε?(T) and loss ε?(T) and in the increase of torsion modulus as well. The start of the vulcanisation reaction is indicated by an increase of dielectric permittivity and torsion modulus in all investigated unvulcanised compounds with carbon black. While for compounds with non-active carbon black the vulcanisation can be better indicated by the ε?(T) anomaly, for compounds with active carbon black it is more clearly seen by the change of ε?(T) behaviour. PY - 2002 UR - http://www.plastverarbeiter.de/ai/resources/d5af83c1e48.pdf SN - 0948-3276 SN - 0022-9520 VL - 55 IS - 1-2 SP - 16 EP - 22 PB - Hüthig CY - Heidelberg AN - OPUS4-1564 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Döring, Joachim A1 - Stark, Wolfgang T1 - Ultrasonic Production Control JF - Kunststoffe : bilingual edition, German + English N2 - Ultrasound waves penetrate solid objects without damaging them. Their fields of application range from the imaging of internal organs in medicine, to interior testing of mechanical and chemical engineering components. However, ultrasonic systems can also be used to visualise the way the mechanical properties of reactive resins change during processing in the mould. PY - 2001 SN - 0945-0084 VL - 91 IS - 1 SP - 35 EP - 36 PB - Hanser CY - München AN - OPUS4-2135 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Döring, Joachim A1 - Stark, Wolfgang A1 - Bartusch, Jürgen A1 - Mc Hugh, Jarlath T1 - Contribution to ultrasound cure control for composite manufacturing JF - The e-journal of nondestructive testing & ultrasonics N2 - The curing conditions play an important role in the quality assurance of composite products. Especially as composite materials are widely used in high tech areas so that they are required to fulfil high quality Standards. Some problems which occur during curing, for instance undercuring, can hardly be detected using Standard NDT investigations, mainly because they are manifested only at high temperatures, particularly close to glass-rubber-transition. On-line eure monitoring has the outstanding advantage that it can monitor the material parameters even at the highest temperatures possible. In recent years eure monitoring with ultrasonic methods has become more populär. In comparison to dielectric methods mechanical parameters are measured directly. The quantities to be measured are the velocity and the attenuation of the sound wave. On this basis the storage and loss modulus can be calculated. Depending on the form of excitation with longitudinal or transversal waves these moduli are referred to as long wave or shear modulus. Well developed Computer based technology and sensor materials are available in the non-destructive testing (NDT) market. The measuring equipment employed a commercial NDT System, which worked computer-aided. With a special Software the demands of automatic Operation under industrial conditions was accomplished. This measurement equipment was tested on composites. Its structure, performance and some practical results will be presented in the following paper. T2 - 15th World Conference on Non-Destructive Testing (WCNDT) CY - Roma, Italy DA - 15.10.2000 PY - 2000 UR - http://www.ndt.net/article/wcndt00/papers/idn482/idn482.htm SN - 1435-4934 VL - 5 IS - 11 PB - NDT.net CY - Kirchwald AN - OPUS4-2136 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Döring, Joachim A1 - Stark, Wolfgang T1 - Produktionskontrolle mit Ultraschall JF - Kunststoffe / Deutsche Ausgabe N2 - Ultraschallwellen durchdringen Festkörper, ohne sie zu schädigen. Der Einsatzbereich von Ultraschall reicht von der Darstellung der inneren Organe in der Medizin bis zur Prüfung des Inneren von Bauteilen im Maschinen- und Anlagenbau. Ultraschall-Systeme können jedoch auch genutzt werden, um sichtbar zu machen, wie sich mechanische Eigenschaften von Reaktionsharzen während ihrer Verarbeitung im Werkzeug verändern. PY - 2001 UR - http://www.kunststoffe.de/directlink.asp?KU101838 SN - 0023-5563 VL - 91 IS - 1 SP - 83 EP - 85 PB - Hanser CY - München AN - OPUS4-2137 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Döring, Joachim A1 - Bartusch, Jürgen A1 - Mc Hugh, Jarlath A1 - Stark, Wolfgang A1 - Kürten, C. T1 - Mit Ultraschall sieht man mehr - Kontrolle von Werkzeugfüllung und Vernetzungsreaktion beim Harzinjektionsverfahren RTM T2 - Poster-Ausstellung "Sensorik in der BAM" T2 - Poster-Ausstellung "Sensorik in der BAM" CY - Berlin, BAM, Deutschland DA - 2002-10-01 PY - 2002 SP - 1(?) AN - OPUS4-2114 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -