Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-47001 Beitrag zu einem Tagungsband Kowitz, Astrid; Wu, Cheng-Chieh; Hille, Falk; Helmerich, Rosemarie; Kadoke, Daniel; Gründer, Klaus-Peter; Hauser, S.; Schwarzinger, H. Pastramă, Ş. D.; Constantinescu, D. M. Impact on a micro-reinforced UHPC: Experimental studies versus numerical modeling Within the presented research project, experimental and numerical investigations were performed to develop a thin-shelled, modular, mobile element system made of a micro-reinforced ultra-high-performance ductile concrete (DUCON®). Material parameters were experimentally determined to adapt the material model within the numerical analysis applying the Drucker-Prager relationship. Afterwards, for validation of the numerical models, quasi-static and high-velocity impact tests were performed on plate-like structures. Finally, a suitable geometry of transportable barrier elements will be designed, which provides a maximum of resistance against impact by a minimum of weight and a maximum of mobility. Bucarest, Romania Editura Printech 2018 35th Danubia-Adria Symposium on Advances in Experimental Mechanics, Extended Abstracts 978-606-23-0874-2 35th Danubia-Adria Symposium on Advances in Experimental Mechanics Sinaia, Romania 25.09.2018 28. 09.2018 11 12 2018-12-13 OPUS4-48181 Zeitschriftenartikel Kowitz, Astrid; Wu, Cheng-Chieh; Helmerich, Rosemarie; Hille, Falk; Kadoke, Daniel; Gründer, Klaus-Peter; Hauser, S.; Schwarzinger, H. Bland, S. Impact on a micro-reinforced UHPC: Experimental studies versus numerical modeling Within the presented research project, experimental and numerical investigations were performed to develop a thin-shelled, modular, mobile element system made of a micro-reinforced ultra-high-performance ductile concrete (DUCON®). Material parameters were experimentally determined to adapt the material model within the numerical analysis applying the Drucker-Prager relationship. Afterwards, for validation of the numerical models, quasi-static and high-velocity impact tests were performed on plate-like structures. Finally, a suitable geometry of transportable barrier elements will be designed, which provides a maximum of resistance against impact by a minimum of weight and a maximum of mobility. Amsterdam Elsevier Ltd 2019 Materials Today: Proceedings 12 2 474 483 10.1016/j.matpr.2019.03.152 2019-06-07 OPUS4-50029 Zeitschriftenartikel Reimold, W. U.; Crosta, A. P.; Hasch, M.; Kowitz, Astrid; Hauser, N.; Sanchez, J. P.; Simoes, L. S. A.; de Sanchez, G. J.; Zaag, P. T. Shock deformation confirms the impact origin for the Cerro do Jarau, Rio Grande do Sul, Brazil, structure Cerro do Jarau is a conspicuous, circular morpho-structural feature in Rio Grande do Sul State (Brazil), with a central elevated core in the otherwise flat "Pampas" terrain typical for the border regions between Brazil and Uruguay. The structure has a diameter of approximately 13.5 km. It is centered at 30o12′S and 56o32′W and was formed on basaltic flows of the Cretaceous Serra Geral Formation, which is part of the Paraná-Etendeka Large Igneous Province (LIP), and in sandstones of the Botucatu and Guará formations. The structure was first spotted on aerial photographs in the 1960s. Ever since, its origin has been debated, sometimes in terms of an endogenous (igneous) origin, sometimes as the result of an exogenous (meteorite impact) event. In recent years, a number of studies have been conducted in order to investigate its nature and origin. Although the results have indicated a possible impact origin, no conclusive evidence could be produced. The interpretation of an impact origin was mostly based on the morphological characteristics of the structure; geophysical data; as well as the occurrence of different breccia types; extensive deformation/silicification of the rocks within the structure, in particular the sandstones; and also on the widespread occurrence of low-pressure deformation features, including some planar fractures (PFs). A detailed optical microscopic analysis of samples collected during a number of field campaigns since 2007 resulted in the disclosure of a large number of quartz grains from sandstone and monomict arenite breccia from the central part of the structure with PFs and feather features (FFs), as well as a number of quartz grains exhibiting planar deformation features (PDFs). While most of these latter grains only carry a single set of PDFs, we have observed several with two sets, and one grain with three sets of PDFs. Consequently, we here propose Cerro do Jarau as the seventh confirmed impact structure in Brazil. Cerro do Jarau, together with Vargeăo Dome (Santa Catalina state) and Vista Alegre (Paraná State), is one of very few impact structures on Earth formed in basaltic rocks. Wiley 2018 Meteoritics & Planetary Science 54 10 2384 2394 10.1111/maps.13233 2019-12-16