@misc{BroserFalterŁawrowskietal., author = {Broser, Christian and Falter, Thomas and Ławrowski, Robert Damian and Altenbuchner, Amelie and V{\"o}gele, Daniel and Koss, Claus and Schlampp, Matthias and Dunnweber, Jan and Steffens, Oliver and Heckner, Markus and Jaritz, Sabine and Schiegl, Thomas and Corsten, Sabine and Lauer, Norina and Guertler, Katherine and Koenig, Eric and Haug, Sonja and Huber, Dominik and Birkenmaier, Clemens and Krenkel, Lars and Wagner, Thomas and Justus, Xenia and Saßmannshausen, Sean Patrick and Kleine, Nadine and Weber, Karsten and Braun, Carina N. and Giacoppo, Giuliano and Heinrich, Michael and Just, Tobias and Schreck, Thomas and Schnabl, Andreas and Gilmore, Amador T{\´e}ran and Roeslin, Samuel and Schmid, Sandra and Wellnitz, Felix and Malz, Sebastian and Maurial, Andreas and Hauser, Florian and Mottok, J{\"u}rgen and Klettke, Meike and Scherzinger, Stefanie and St{\"o}rl, Uta and Heckner, Markus and Bazo, Alexander and Wolff, Christian and Kopper, Andreas and Westner, Markus and Pongratz, Christian and Ehrlich, Ingo and Briem, Ulrich and Hederer, Sebastian and Wagner, Marcus and Schillinger, Moritz and G{\"o}rlach, Julien and Hierl, Stefan and Siegl, Marco and Langer, Christoph and Hausladen, Matthias and Schreiner, Rupert and Haslbeck, Matthias and Kreuzer, Reinhard and Br{\"u}ckl, Oliver and Dawoud, Belal and Rabl, Hans-Peter and Gamisch, Bernd and Schmidt, Ottfried and Heberl, Michael and G{\"a}nsbauer, Bianca and Bick, Werner and Ellermeier, Andreas and Monkman, Gareth J. and Prem, Nina and Sindersberger, Dirk and Tschurtschenthaler, Karl and Aurbach, Maximilian and Dendorfer, Sebastian and Betz, Michael A. and Szecsey, Tamara and Mauerer, Wolfgang and Murr, Florian}, title = {Forschung 2018}, editor = {Baier, Wolfgang}, address = {Regensburg}, organization = {Ostbayerische Technische Hochschule Regensburg}, isbn = {978-3-9818209-5-9}, doi = {10.35096/othr/pub-1382}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-13826}, pages = {98}, subject = {Forschung}, language = {de} } @inproceedings{WagnerNeidhart, author = {Wagner, Bernd and Neidhart, Thomas}, title = {Die axiale Bettung von KMR in ZFSV und Sand}, series = {"Dumme" Rohre - "Intelligente" Netze: Modelle, Simulation und Steuerung von Infrastrukturen, 30. Oldenburger Rohrleitungsforum}, booktitle = {"Dumme" Rohre - "Intelligente" Netze: Modelle, Simulation und Steuerung von Infrastrukturen, 30. Oldenburger Rohrleitungsforum}, publisher = {Vulkan-Verlag}, address = {Essen}, isbn = {978-3-8027-2799-3}, pages = {736 -- 751}, abstract = {Die Verlegung von Kunststoffverbundmantelrohren (KMR) im Fernw{\"a}rmeleitungsbau ausschließlich in zeitweise fließf{\"a}higen, selbstverdichtenden Verf{\"u}llbaustoffen (ZFSV) in der Leitungszone anstelle in Sand, ist weitgehend neu. Interesse an dieser Methode besteht aus technischer Sicht infolge h{\"o}herer nachgewiesener Haltekr{\"a}fte in Technikums- und Laborversuchen, die die Leitungsbewegungen reduzieren k{\"o}nnen. Es existiert jedoch noch kein praxistaugliches Berechnungsmodell bzw die Grundlagen hierf{\"u}r. U.a. deswegen wird derzeit an der Ostbayerischen Technischen Hochschule Regensburg (OTH.R) das Forschungsvorhaben "EnEff: W{\"a}rme - Innovative Fernw{\"a}rmeverteilung - Einsatz fließf{\"a}higer Verf{\"u}llbaustoffe zur KMR-Verlegung, Arbeitspaket Bodenmechanik" durchgef{\"u}hrt. Es wird im Referat der Unterschied der axialen Bettung von KMR in ZFSV und Sand anhand einer analytischen L{\"o}sung vorgestellt. Diese erlaubt die Berechnung von Verschiebungen und Normalkr{\"a}ften f{\"u}r das KMR f{\"u}r die Bettung in ZFSV erfolgt dies unter Verwendung der mittels eines neuartigen Versuchs(behalters) Re-SIST nun bestimmbaren bisher unbekannten Kontaktwiderstandsarbeitslinie zwischen ZFSV und PE. Zur Verdeutlichung der Unterschiede bei Sand- und ZFSV-Bettung werden Ergebnisse einer vergleichenden Berechnung an einer sonst identischen KMR-Leitung vorgestellt. Diese zeigen, dass in ZFSV die Verschiebungen geringer ausfallen und weniger Leitungslange in Bewegung ist, was sich mit Beobachtungen an einer Fernw{\"a}rmeleitung in Ulm deckt. Die Ausf{\"u}hrungen gelten f{\"u}r das erstmalige Warmgehen.}, language = {de} } @article{WagnerNeidhart, author = {Wagner, Bernd and Neidhart, Thomas}, title = {Prognose der Druckfestigkeitsentwicklung von ZFSV : Vorschlag zweier Methoden}, series = {Euroheat \& Power}, volume = {45}, journal = {Euroheat \& Power}, number = {1/2}, publisher = {VDE Verlag}, issn = {0949-166X}, pages = {35 -- 39}, language = {de} } @inproceedings{WagnerNeidhart, author = {Wagner, Bernd and Neidhart, Thomas}, title = {A new backfill material enhancing axial bedding of district heating pipes}, series = {Energy Geotechnics - Proceedings of the 1st International Conference on Energy Geotechnics, ICEGT 2016, Kiel, Germany, 29-31 August 2016}, booktitle = {Energy Geotechnics - Proceedings of the 1st International Conference on Energy Geotechnics, ICEGT 2016, Kiel, Germany, 29-31 August 2016}, publisher = {CRC Press}, address = {London}, isbn = {978-1-138-03299-6}, doi = {10.1201/b21938}, pages = {105 -- 112}, abstract = {District heating cost reduction efforts are amongst others focusing on the use of a new backfillmaterial. The OTH.R is investigating this material in regard to the engineering of buried district heating pipes.The main focus of this soil-structure interaction problem is axial bedding to reduce thermal induced elongations.The backfill material is characterized and an axial non-linear spring-based calculation method is described.Centerpiece of the method is the contact-working-resistance-line (CWRL).A new Rod-Shear-Test based testingdevice Re-SIST to investigate the CWRL for the new backfill material is presented. The investigated CWRL isdescribed and compared to the CWRL for sand, which is the conventional backfill material. Solutions using thespring-based calculation method are presented and a comparative example of calculation shows the differencein axial bedding when the new backfill material is used.}, language = {en} } @article{GeithSwidergalHochholdingeretal., author = {Geith, Markus A. and Swidergal, Krzysztof and Hochholdinger, Bernd and Schratzenstaller, Thomas and Wagner, Marcus and Holzapfel, Gerhard A.}, title = {On the importance of modeling balloon folding, pleating, and stent crimping: An FE study comparing experimental inflation tests}, series = {International Journal for Numerical Methods in Biomedical Engineering}, volume = {35}, journal = {International Journal for Numerical Methods in Biomedical Engineering}, number = {11}, publisher = {Wiley}, doi = {10.1002/cnm.3249}, abstract = {Finite element (FE)-based studies of preoperative processes such as folding,pleating, and stent crimping with a comparison with experimental inflation tests are not yet available. Therefore, a novel workflow is presented in which residual stresses of balloon folding and pleating, as well as stent crimping, and the geometries of all contact partners were ultimately implemented in an FE code to simulate stent expansion by using an implicit solver. The numerical results demonstrate that the incorporation of residual stresses and strains experienced during the production step significantly increased the accuracy of the subsequent simulations, especially of the stent expansion model. During the preoperative processes, stresses inside the membrane and the stent material also reached a rather high level. Hence, there can be no presumption that balloon catheters or stents are undamaged before the actual surgery. The implementation of the realistic geometry, in particular the balloon tapers, and the blades of the process devices improved the simulation of the expansion mech-anisms, such as dogboning, concave bending, or overexpansion of stent cells. This study shows that implicit solvers are able to precisely simulate the mentioned preoperative processes and the stent expansion procedure without a preceding manipulation of the simulation time or physical mass.}, subject = {Stent}, language = {en} } @article{WagnerNeidhartWeidlich, author = {Wagner, Bernd and Neidhart, Thomas and Weidlich, Ingo}, title = {Initial findings of the research project: Contact behavior of temporarily fluid, self-compacting backfilling materials and HDPE}, series = {Euroheat and Power/Fernw{\"a}rme International}, volume = {42}, journal = {Euroheat and Power/Fernw{\"a}rme International}, number = {10}, pages = {26 -- 29}, language = {en} } @article{WagnerNeidhartWeidlichetal., author = {Wagner, Bernd and Neidhart, Thomas and Weidlich, Ingo and Schleyer, A.}, title = {Innovative Fernw{\"a}rmeverteilung: Einsatz fließf{\"a}higer Verf{\"u}llbaustoffe zur KMR-Verlegung}, series = {Euroheat \& power : W{\"a}rme, K{\"a}lte, Kraft-W{\"a}rme-Kopplung}, volume = {42}, journal = {Euroheat \& power : W{\"a}rme, K{\"a}lte, Kraft-W{\"a}rme-Kopplung}, number = {9}, publisher = {VDE-Verlag}, issn = {0949-166X}, pages = {54 -- 56}, language = {de} } @inproceedings{WagnerNeidhartGoemmel, author = {Wagner, Bernd and Neidhart, Thomas and G{\"o}mmel, Roland}, title = {Bodenmechanische Eigenschaften von ZFSV und zementbasierte Prognosemodelle zur Druckfestigkeitsentwicklung}, series = {10. Kolloquium Bauen in Boden und Fels, Technische Akademie Esslingen, 19. + 20. Januar 2016, Esslingen}, booktitle = {10. Kolloquium Bauen in Boden und Fels, Technische Akademie Esslingen, 19. + 20. Januar 2016, Esslingen}, isbn = {978-3-943563-21-4}, pages = {125 -- 142}, abstract = {Der wissenschaftliche Untersuchungsstand von Zeitweise fließf{\"a}higen, selbstverdichtenden Verf{\"u}llbaustoffen (ZSFV) unter Zugabe von Zement und/ oder Bentonit sowie Wasser zu Grundmaterial ist gering. Die OTH Regensburg (OTH.R) untersucht im Forschungsvorhaben EnEff systematisch verschiedene ZFSV f{\"u}r den Einsatz im Infrastrukturbau, speziell Fernw{\"a}rmeleitungen. Neben der dort haupts{\"a}chlich interessierenden Kontaktmechanik zu axialen Temperaturdehnungsbehinderung werden bodenmechanische Eigenschaften und deren Zeitabh{\"a}ngigkeit untersucht. Im Beitrag werden nach einer einf{\"u}hrenden Charakterisierung von ZFSV und kurzen Darstellung der Bedeutung der Zugabe von Zement und Bentonit Ergebnisse von bodenmechanischen Untersuchungen in Abh{\"a}ngigkeit des Materialalters und teilweise in Referenz zum Grundmaterial (hier: Boden) vorgestellt. Im Weiteren werden zwei auf ZFSV adaptierte, zementbasierte Prognosemodelle zur Vorhersage der zeitlichen Entwicklung der Druckfestigkeit vorgestellt.}, language = {de} } @misc{BeimlerLeisslEbneretal., author = {Beimler, Josef and Leißl, Caroline and Ebner, Lena and Elsner, Michael and M{\"u}hlbauer, Gerhard and Kohlert, Dieter and Schubert, Martin J. W. and Weiß, Andreas P. and Sterner, Michael and Raith, Thomas and Afranseder, Martin and Krapf, Tobias and Mottok, J{\"u}rgen and Siemers, Christian and Großmann, Benjamin and H{\"o}cherl, Johannes and Schlegl, Thomas and Schneider, Ralph and Milaev, Johannes and Rampelt, Christina and Roduner, Christian and Glowa, Christoph and Bachl, Christoph and Schliekmann, Claus and Gnan, Alfons and Grill, Martin and Ruhland, Karl and Piehler, Thomas and Friers, Daniel and Wels, Harald and Pflug, Kenny and Kucera, Markus and Waas, Thomas and Schlachetzki, Felix and Boy, Sandra and Pemmerl, Josef and Leis, Alexander and Welsch, Andreas F.X. and Graf, Franz and Zenger, Gerhard and Volbert, Klaus and Waas, Thomas and Scherzinger, Stefanie and Klettke, Meike and St{\"o}rl, Uta and Heyl, C. and Boldenko, A. and Monkman, Gareth J. and Kujat, Richard and Briem, Ulrich and Hierl, Stefan and Talbot, Sebastian and Schmailzl, Anton and Ławrowski, Robert Damian and Prommesberger, Christian and Langer, Christoph and Dams, Florian and Schreiner, Rupert and Valentino, Piergiorgio and Romano, Marco and Ehrlich, Ingo and Furgiuele, Franco and Gebbeken, Norbert and Eisenried, Michael and Jungbauer, Bastian and Hutterer, Albert and Bauhuber, Michael and Mikrievskij, Andreas and Argauer, Monika and Hummel, Helmut and Lechner, Alfred and Liebetruth, Thomas and Schumm, Michael and Joseph, Saskia and Reschke, Michael and Soska, Alexander and Schroll-Decker, Irmgard and Putzer, Michael and Rasmussen, John and Dendorfer, Sebastian and Weber, Tim and Al-Munajjed, Amir Andreas and Verkerke, Gijsbertus Jacob and Renkawitz, Tobias and Haug, Sonja and Rudolph, Clarissa and Zeitler, Annika and Schaubeck, Simon and Steffens, Oliver and Rechenauer, Christian and Schulz-Brize, Thekla and Fleischmann, Florian and Kusterle, Wolfgang and Beer, Anne and Wagner, Bernd and Neidhart, Thomas}, title = {Forschungsbericht 2013}, editor = {Baier, Wolfgang}, address = {Regensburg}, organization = {Ostbayerische Technische Hochschule Regensburg}, doi = {10.35096/othr/pub-799}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-7990}, pages = {80}, language = {de} }