1,030 research outputs found
Design of Delamination- and Impact-Resistant Fibre Reinforced Composites based on Customized 3D Multilayer Fabrics [DATASET]
No full textThis record provides an overview of the data from the dissertation “Design of Delamination- and Impact-Resistant Fibre Reinforced Composites based on Customized 3D Multilayer Fabrics" by Philipp Maria Huber, RWTH Aachen University, date of oral examination 31.10.2024. A total of twelve 3D-woven CFRP and one laminated reference were developed, manufactured and extensively tested. The data is provided according to the FAIR principle under the listed records. The data is intended for further use, e.g. for modelling or calculations and to facilitate the development of 3D-woven FRP. A suitable licence is attached to each individual file. The naming of the files corresponds to the nomenclature used in the dissertation. All data sets are named with the test method and the sample designation. The produced fabrics, composites, provided data and contributing students are listed in the attached PDF. The respective datasets can be accessed via the related database entries
Quality and Architecture of Twelve 3D-Woven CFRP and One Laminated Reference [DATASET]
No full textThis record contains the necessary data for the evaluation of the fabrics and composites produced in the dissertation “Design of Delamination- and Impact-Resistant Fibre Reinforced Composites based on Customized 3D Multilayer Fabrics" by Philipp Maria Huber, RWTH Aachen University, date of oral examination 31.10.2024. The designed fabrics have been produced on an industrial 3D weaving machine and processed into CFRP. The manufacturing processes are described. Due to the various manufacturing steps and associated process parameters, the real architecture of (3D-woven) CFRP typically differs from the idealized architecture. The data provided is intended to enable the assessment of the quality of the fabrics and composites and to facilitate further use, e.g. in simulations of the real architecture or defects. The following data was collected: * Fabric areal weight and thickness * Fibre volume content of the CFRP * CT scans and individual polished sections of the real architectur
Material Property Charts of Twelve 3D-Woven CFRP and One Laminated Reference
No full textThis record contains the material charts created in the dissertation “Design of Delamination- and Impact-Resistant Fibre Reinforced Composites based on Customized 3D Multilayer Fabrics" by Philipp Maria Huber, RWTH Aachen University, date of oral examination 31.10.2024. The mechanical properties of 12 different 3D-woven carbon fibre-reinforced plastics and a laminated reference were investigated. The investigation includes the tensile properties in warp and weft direction, the compression properties, the inter- and intralaminar shear properties as well as the compression properties after impact. For this purpose, 12 different textile architectures were designed using design of experiments. The parameters z-fibre content, binding type and binder angle were investigated. The fabrics were then produced on an industrial weaving machine and processed into CFRP. The reference was produced using the same processes. All process parameters were kept constant as far as possible. In addition to the mechanical parameters, the architecture was determined using microCT scans. The material charts consist of information on fabric and weaving, composite material and production as well as the basic mechanical characteristics. The fabric details include the designation according to [BCN15]*, a weave pattern and the fibre data. In addition to the machine used, the warp and weft density and the weaving speed are the most important parameters for the weaving process. Further details, e.g. warp tension, cannot be precisely adjusted by users and are therefore deliberately omitted. The information on the composite material includes the infusion process, the resin/hardener system, the cured thickness per layer and the FVG. A representative CT image also provides an impression of the z-reinforcement in the composite material. The basic mechanical values section contains the basic values required for a design. In addition, the CAI values are also listed to enable an estimation of the damage tolerance. *[BCN15] Boussu, F.; Cristian, I.; Nauman, S.: General definition of 3D warp interlock fabric architecture Composites Part B: Engineering 81 (2015), S. 171–188, doi: 10.1016/j.compositesb.2015.07.01
Weave Pattern of Twelve 3D-Woven CFRP and One Laminate Reference [DATASET]
No full textThis record contains the weave pattern of the fabrics created in the dissertation “Design of Delamination- and Impact-Resistant Fibre Reinforced Composites based on Customized 3D Multilayer Fabrics" by Philipp Maria Huber, RWTH Aachen University, date of oral examination 31.10.2024. The data is intended to help understand the weave pattern and enable the fabrics to be reproduced. Twelve 3D and one 2D reference woven samples have been developed. The textile parameters z-fibre ratio, binding angle and z-binding are varied. The 3D bindings were designed according to the specified restrictions and factor levels from the design of experiments. The constraints include: Omission of bindings in the top and intermediate layers; Uniform material for all yarn systems; Uniform thickness, eight layers; Reduction of the z-fibre content via the floatation of the z fibres. The weave is selected symmetrically so that the top and bottom of the fabric are the same. A broken twill was selected as the weave pattern to prevent a preferred direction due to the twill weave. The twill length corresponds to the floatation of the z-fibres. The record contains the following data: The binding patterns of the 3D fabrics and reference are shown. The visualisation includes the overall weave and the individual weave of the layers. The fully defined weave patterns were created using the CAD/CAM software Design Scope from EAT GmbH, Krefeld, Germany and transferred to the machine data of the weaving machine. The data is saved in EAT Design Scope file format .eatpc. Additionaly pictures of the layer-wise and resulting weave pattern are provided as PDF
Economics of 3D-Weaving for CFRP [DATASET]
No full textThis record contains the collected economic data from the dissertation “Design of Delamination- and Impact-Resistant Fibre Reinforced Composites based on Customized 3D Multilayer Fabrics" by Philipp Maria Huber, RWTH Aachen University, date of oral examination 31.10.2024. 3DWICs have the potential to reduce costs in the manufacturing process. In order to evaluate this potential, a suitable methodology has been developed to determine the process costs for the production of conventional 2D and innovative 3D woven FRPs. To achieve this, the manufacturing processes are first described and analysed. Empirical data is then collected as part of a case study. The cost drivers of the individual process steps are identified with the help of a document analysis and expert interviews. Based on this, process costs are modelled for both reference processes in order to enable a comparison of costs and profitability. In the final step, the influence of important parameters is analysed as part of a sensitivity analysis. The work was supervised as a joint master's thesis by the Chair of Controlling and the Institute für Textiltechnik of RWTH Aachen University. The record contains the conducted structured interviews with eight companies along the process chain for 3D-woven composites as well as the interview guideline. In addition, the record contains an interview protocol with a company that is developing a propulsion for an UAM. On this basis, a representative load case for a demonstrator and its requirements for the technical and economic evaluation were determined
Mikromorphologische Untersuchungen zu syn- und postsedimentären Veränderungen sowie Auflassungsprozessen an Schichtsequenzen in prähistorischen Seeufersiedlungen
No full textDie Analyse und Interpretation von Schichtbildungsprozessen kann für jede Untersuchung einer Seeufersiedlung oder einer anderen Fundstellen im Feuchtbodenbereich als von entscheidender Bedeutung angesehen werden. Dies liegt hauptsächlich an der oft sehr spezifischen und komplexen Art und Weise, wie sich die Ablagerungen in diesem Bereich gebildet und im Laufe der Zeit verändert haben. Insbesondere in Fällen mit einer guten Kulturschichterhaltung kann die makroskopische Beurteilung der zuvor genannten Phänomene nicht ausreichen. Hier erscheint vor allem die mikromorphologische Analyse mit der Fähigkeit, auch kleinste Ereignisse innerhalb einer Stratigraphie erfassen zu können, als die Methode der Wahl. Während ein besseres Verständnis der allgemeinen Schichtbildungsprozesse bereits vor kurzem erreicht worden ist (Ismail-Meyer et al. 2013), müssen insbesondere die syn- und postsedimentären Prozesse sowie Auflassung einer Siedlung als schwer zu fassen gelten.
Zur Lösung dieses Problems wurde eine detaillierte Studie an einem diachron aufgebauten Probenspektrum aus verschiedenen Fundstellen und mit einer grossen Anzahl an Proben aus der Grabung Zürich-Opéra, wo eine Fläche von etwa 3000 Quadratmetern mit mehreren neolithischen Pfahlbausiedlungen untersucht werden konnte, unter Verwendung der Mikromorphologie als primäre Untersuchungsmethode durchgeführt. Dabei wurde angenommen, dass nur durch eine mikroskopische Untersuchung von Stratigraphien der verschiedenen Pfahlbausiedlungen die fraglichen Prozesse erfasst und mit natürlichen oder kulturellen Phänomenen verknüpft werden können. Die untersuchten Proben wurden aus Pfahlbauten vom Neolithikum bis zu Bronzezeit am Zürichsee, Greifensee, Zugersee (alle Schweiz) und dem Lago di Viverone (Italien) gesammelt. Sie wurden mit Epoxidharz eingegossen, zu Dünnschliffen weiterverarbeitet und mit Hilfe eines Polarisationsmikroskops analysiert.
Mit etwa 38 untersuchten Proben und mehr als 400 detaillierten Schichtbeschreibungen - integriert in einer individuell gestalteten Datenbank – wurde eine aussergewöhnlich grosse Menge an Daten erhoben, so dass eine akribische Rekonstruktion der Schichtbildungsprozesse in jedem Profil möglich war. Insgesamt konnten 20 Profile plus vier experimentelle Proben sowie der Inhalt eines Keramikgefässes, das vollständig in einer der Kulturschichten von Zürich-Opéra eingebettet war, analysiert werden. Die dabei festgestellten grossen Unterschiede innerhalb von Proben einer einzigen Fundstelle sind bemerkenswert und bedürfen einer Erklärung. Mit 28 analysierten Proben über die ca. 3000 Quadratmeter grosse Grabungsfläche von Zürich-Opéra war es möglich, eine intra site-Analyse durchzuführen. Es kann durchaus festgehalten werden, dass es sich hier um eine der am intensivsten mikromorphologisch untersuchten Pfahlbausiedlung in Bezug auf die Fläche und die Anzahl der Profile handelt.
Vor allem dank dieser detaillierten Analyse konnten mehrere Arten von Ablagerung, Erosion und sonstigen Veränderungen festgestellt werden, die zum Verständnis der verändernden und zerstörenden Prozesse in Pfahlbauten beitragen. Leider stand von den anderen Fundstellen weit weniger Probenmaterial zur Verfügung. Dennoch boten sie eine wichtige diachrone Perspektive und erlauben, die in Zürich-Opéra identifizierten und analysierten Prozesse in einen grösseren zeitlichen Rahmen zu stellen. Die Ergebnisse führen zu dem Schluss, dass die Bewohner einer Seeufersiedlung sich mit verändernden Umweltbedingungen beschäftigen mussten und dazu auch durchaus in der Lage waren. So wird offensichtlich, dass der Grund für die endgültige Aufgabe der Pfahlbauten nicht alleine in einer schweren Überschwemmung aufgrund einer Klimaverschlechterung gesehen werden kann. Andere denkbare Variablen, wie zum Beispiel die Verlagerung von Handelsrouten, müssen ebenso beachtet werden.
Es wurde deutlich, dass die Analyse der Taphonomie von Pfahlbauten mittels Mikromorphologie ein enormes Potenzial zur Gewinnung eines vollständigeren Bildes von Verhaltensmustern der Siedler ergibt. Das vorhandene Wissen über Schichtbildungsprozesse in Seeufersiedlungen konnte mit einem besonderen Fokus auf verändernde und zerstörende Prozesse erweitert werden, die eine Fundstelle vor und nach ihrer Aufgabe betreffen können
Mechanical Properties of Twelve 3D-Woven CFRP and One Laminated Reference [DATASET]
No full textThis record contains the testing data from the dissertation “Design of Delamination- and Impact-Resistant Fibre Reinforced Composites based on Customized 3D Multilayer Fabrics" by Philipp Maria Huber, RWTH Aachen University, date of oral examination 31.10.2024. Twelve 3D-woven CFRP and one laminated reference have been characterised by mechanical testing. The textile parameters z-fibre content, binding angle and the type of z-binding are analysed as factors of the 3D fabrics. Statistical design of experiments is used for this purpose. The behaviour under tensile (warp and weft direction), compression, in-plane and out-of-plane shear loading is characterised. In addition, the impact and post-impact behaviour is investigated. The results are analysed using multiple linear regression and correlations are derived. The record contains the following data: *The measured data as Excel files for each sample (tensile in warp and weft, compression, inter- and intralaminar shear, compression after impact) * CT-Scans after Impact * List of DIC files for shear and CAI that are available on request from the author due to the file size. The test methods, standards and deviation from these standards are described in the attached meta files for each test. The data is intendet for further use, e.g. calibration and validation of simulation modells or understanding of the material behaviour
University Chorale, April 7, 1998, 04/07
No full textRecorded during a live performance at Dalton Center Recital Hall, Western Michigan University, Kalamazoo, Michigan, April 7, 1998, 8:00 p.m., the 501st concert of the School of Music's 1997-1998 season.Western Michigan University Chorale, Craig S. Arnold, conductor ; David Close, accompanist ; assisted by the Western String Chamber Orchestra, Bruce J. Uchimura, conductor (in the 9th work) ; various vocal soloists and instrumentalists.Sacred and secular vocal music for mixed chorus, in part with instrumental accompaniment.Information from performance program.Wake, awake, for night is flying / Philipp Nicolai ; arranged by F. Melius Christiansen -- Psalm no. 8 : for a cappella choir / Ramon Zupko -- ""Ave Maria"" from Triptych / Alan Hovhaness (women of the chorale ; Chris Sargent, synthesizer) -- Inveni David / Anton Bruckner (men of the chorale ; Matt Westgate, David Krosschell, Chris Sargent, Ibrahim Sodawalla, trombones) -- Quand je fus pris au pavillon / Reynaldo Hahn (Diana B. Nordlund, mezzo-soprano ; David Close, piano) -- ""In quelle trine morbide"" from Manon Lescaut / Giacomo Puccini (Renée Carriere, soprano ; Gunta Laukmane, piano) -- Etude in F minor, op. 25, no. 2 / Frédéric Chopin (Carrie Bursch, piano) -- ""Every valley"" from Messiah / George Frideric Handel (John Russell, tenor ; Sean Mirate, piano) -- Trio from Act III of Der Rosenkavalier / Richard Strauss (Amanda Wells (Marschallin), Michelle LaGruth (Octavian), Amy Schaub (Sophie) ; Gunta Laukmane, piano) -- Grand mass in C minor, K. 427. Kyrie (Carrie Sikkenga, mezzo-soprano) ; Gloria ; Credo ; Sanctus / Wolfgang Amadeus Mozart -- Ave Maria / Javier Busto -- Black sheep / American lullaby ; arranged by John Rutter (Ellen Wingertzahn, soprano) -- Quicksand years / René Clausen (Scott Couper, baritone) -- Tonight, eternity alone / René Clausen (Karen Huber, Carrie Bursch, sopranos)
Author Correction: Auto-aggressive CXCR6+ CD8 T cells cause liver immune pathology in NASH
No full textIn this Article, the surname of Tobias Boettler was incorrectly shown as ‘Böttler’, and the surname of author Jan-Philipp Mallm was incorrectly shown as ‘Malm’. The original Article has been corrected online
Comparison of three dimensional mapping techniques
No full textThesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (p. 25-26).Modern robots are involved in sophisticated manipulations of their environment, and for that they need extensive knowledge of their surroundings. 3D mapping allows for the creation of such complex maps, and here we explore some of the options available for the creation of 3D maps. We consider using 2D and 3D sensors to see how helpful the extra information is.by Maria Guirguis.M.Eng
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