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  • 1
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 639 ( 2015-3), p. 41-48
    Abstract: Product development is complex due to the manifold requirements resulting from various perspectives, such as design, production, safety and sales. A concurrent engineering (CE) approach permits to respect all perspectives in the early development stage. However, in the architecture and construction sector for example, CE is particularly difficult to realize, because the central steering for this collaboration process is missing. Thus, the application of CE in the research sector can promote technical progress and cost reduction. In the specific field of freeform architecture, in most cases an individual shape of single components is unavoidable and the use of standard components impossible. Due to missing universal and mature construction concepts for freeform buildings, they are mostly realized with customized solutions often including material-consuming substructures, while the visible skin has only limited structural and functional properties.In this context the present paper proposes a novel universal panel system made of double-curved sheet metal layers enabling the assembly of self-supporting lightweight structures for the realization of freeform surfaces. The panel system has been developed in cooperation of architects, construction and production engineers, successfully applying an interdisciplinary CE approach. As a result, the concept allows for material and cost efficient solutions applicable for a wide range of freeform applications. The detailed development of the panel system is still in progress.Besides the general panel concept, the paper presents in particular the corresponding manufacturing chain and the tooling concept. Accounting for the varying part geometries in this application a flexible manufacturing chain based on the combination of stretch forming and incremental sheet forming has been developed. The entire production process is implemented in a single machine setup and successfully tested on a small-scale prototype.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2015
    detail.hit.zdb_id: 2073306-9
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  • 2
    Online Resource
    Online Resource
    Wiley ; 1929
    In:  Zeitschrift für anorganische und allgemeine Chemie Vol. 179, No. 1 ( 1929-02-19), p. 1-26
    In: Zeitschrift für anorganische und allgemeine Chemie, Wiley, Vol. 179, No. 1 ( 1929-02-19), p. 1-26
    Type of Medium: Online Resource
    ISSN: 0863-1786
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1929
    detail.hit.zdb_id: 201094-X
    detail.hit.zdb_id: 1481139-X
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  • 3
    Online Resource
    Online Resource
    Wiley ; 2012
    In:  Stahlbau Vol. 81, No. 2 ( 2012-02), p. 133-141
    In: Stahlbau, Wiley, Vol. 81, No. 2 ( 2012-02), p. 133-141
    Type of Medium: Online Resource
    ISSN: 0038-9145
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 2159000-X
    detail.hit.zdb_id: 240072-8
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  • 4
    Online Resource
    Online Resource
    Wiley ; 2014
    In:  Bautechnik Vol. 91, No. 1 ( 2014-01), p. 38-45
    In: Bautechnik, Wiley, Vol. 91, No. 1 ( 2014-01), p. 38-45
    Type of Medium: Online Resource
    ISSN: 0932-8351
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2014
    detail.hit.zdb_id: 2151238-3
    detail.hit.zdb_id: 240073-X
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  • 5
    Online Resource
    Online Resource
    Wiley ; 2015
    In:  Bautechnik Vol. 92, No. 6 ( 2015-06), p. 403-411
    In: Bautechnik, Wiley, Vol. 92, No. 6 ( 2015-06), p. 403-411
    Abstract: Selbstbohrende Vollgewindeschrauben, die ohne Vorbohrung eingeschraubt werden können, haben sich neben ihrer Funktion als Befestigungsmittel im Holzbau auch als leistungsfähige Bauteilverstärkungen und als stabförmige Fügungselemente erwiesen. Für diesen Einsatz sind große Einbaulängen l eff 〉 20 d und sehr große Längen l 〉 0,6 m erforderlich, die hinsichtlich eines richtungsgenauen Einbaus Probleme verursachen. Bedingt durch die Inhomogenität des natürlichen Baustoffs Holz tritt schon beim Einschrauben von mittleren Schraubenlängen das sogenannte ‘Verlaufen’ der Schrauben, d. h. die Richtungsabweichung der Schraubenspitze von der vorgehaltenen Einschraublage, ein und nimmt mit zunehmender Einschraublänge sogar überproportional zu. Während kurze Einschraublängen im Abbund problemlos mechanisch vorgebohrt werden können, ist bei größeren Einschraublängen eine exakt geradlinige Vorbohrung zur Richtungsführung der Schrauben potenziell nur durch Laserstrahlbohren zu erwarten. Der Energie‐ und Wärmeeintrag durch die Laserstrahlung führt zu einer thermischen Umwandlung des die Bohrung umgebenden Holzes, die eine Beeinflussung der Tragfähigkeit von darin eingeschraubten Vollgewindeschrauben mit sich bringen kann. An der RWTH Aachen wurden vom Lehrstuhl Tragkonstruktionen (trako) in Kooperation mit dem Lehrstuhl für Lasertechnik (LLT) Versuche zum Bohren von Brettschichtholz mittels Laserstrahlung sowie zum Trag‐ und Verbundverhalten von selbstbohrenden Vollgewindeschrauben in auf diese Weise erstellten Bohrungen für kurze Bohr‐ und Einbindelängen ( l = 6 d) durchgeführt. Die Ergebnisse unterstreichen das Entwicklungspotenzial dieses innovativen Holzbearbeitungsverfahrens für die Holzbautechnik. Laser‐drilled guide holes for self‐tapping screws – Installation and load bearing behaviour Self‐tapping continuously threaded screws can be installed without predrilling and have – besides their use as fasteners – proven suitable as high‐performance reinforcements of structural members and joints in timber construction. For this type of application big installation depths ( l eff 〉 20 d) and screw lengths ( l 〉 0.6 m) are required which cause problems regarding precisely positioned installation. Due to the inhomogeneity of wood as a natural material, even at medium size lengths the screws tend to 'stray' i. e. a deviation of the screw tip from the designated axis occurs which is increasing disproportionately with growing screw lengths. While for shorter screws mechanically drilled holes are commonly used as guidance, for longer screws potentially only laser‐drilled holes can ensure a straight direction of the screw axis. The high energy and heat input of the laser beam results in a thermal modification of the wood around the drill hole, thus presumably influencing the load bearing and bond behaviour of screws that are screwed into such holes. The Chair of Structures and Structural Design and the Chair of Laser Technology of RWTH Aachen University carried out a series of tests to examine the use of laser radiation to drill holes in glued laminated timber and to evaluate the load bearing behaviour of self‐tapping screws installed in these holes focussing on short drill‐/bond lengths ( l = 6 d).The results point out the potential of the development of this innovative wood processing method for the field of timber construction.
    Type of Medium: Online Resource
    ISSN: 0932-8351 , 1437-0999
    URL: Issue
    RVK:
    Language: German
    Publisher: Wiley
    Publication Date: 2015
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    detail.hit.zdb_id: 240073-X
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  • 6
    Online Resource
    Online Resource
    Wiley ; 2017
    In:  Bautechnik Vol. 94, No. 11 ( 2017-11), p. 776-789
    In: Bautechnik, Wiley, Vol. 94, No. 11 ( 2017-11), p. 776-789
    Abstract: Deformation‐ and load‐bearing behaviour of glue‐laminated‐timber under load entry by fully‐threaded‐screws For some time past fully‐threaded‐screws are not anymore used for fixing but also as reinforcement and exclusive connecting elements of structural timber parts. In this context particularly long screws ( l 〉 300 mm) compared to conventional applications are deployed. They work similar to steel reinforcement in concrete carrying tensile and compression forces and bind structural elements together. Timber and screws together may be described as a composite material like concrete, however with an anisotropic matrix with different strength and stiffness in the different dimensions of the material‐matrix. Depending on the position of a screw and their inclination to grain different load‐bearing effects arise which were hard to verify until now. Investigations of bond behaviour of fully‐threaded‐screws brought in timber carried out by the Chair of Structures and Structural Design and the Institute of Material Sciences (ibac) of Aachen University with the help of Digital Image Correlation (DIC) allowed the visualization of strain and deformation distribution on the surfaces of structural timber elements. In difference to strain‐measuring‐gauges which give just spotty information the DIC‐method gives a coherent view on the strain and deformation distribution of individual timber specimens and that way a visualization of the actual and local loadbearing behaviour of screw‐reinforced‐timber.
    Type of Medium: Online Resource
    ISSN: 0932-8351 , 1437-0999
    URL: Issue
    RVK:
    Language: German
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2151238-3
    detail.hit.zdb_id: 240073-X
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  • 7
    Online Resource
    Online Resource
    Elsevier BV ; 2017
    In:  International Journal of Mechanical Sciences Vol. 120 ( 2017-01), p. 322-340
    In: International Journal of Mechanical Sciences, Elsevier BV, Vol. 120 ( 2017-01), p. 322-340
    Type of Medium: Online Resource
    ISSN: 0020-7403
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2017
    detail.hit.zdb_id: 1498168-3
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  • 8
    Online Resource
    Online Resource
    Wiley ; 2012
    In:  Stahlbau Vol. 81, No. 3 ( 2012-03), p. 233-242
    In: Stahlbau, Wiley, Vol. 81, No. 3 ( 2012-03), p. 233-242
    Type of Medium: Online Resource
    ISSN: 0038-9145
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 2159000-X
    detail.hit.zdb_id: 240072-8
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  • 9
    Online Resource
    Online Resource
    Wiley ; 2018
    In:  Stahlbau Vol. 87, No. 7 ( 2018-07), p. 706-717
    In: Stahlbau, Wiley, Vol. 87, No. 7 ( 2018-07), p. 706-717
    Abstract: The vanished engineer. In 2017 the inauguration of the Müngsten Bridge, a most ambitious, wide‐span bridge from 19 th century Germany, dated back 120 years. For that reason, a designation of the bridge as a UNESCO World heritage site as part of a conglomerate together with four other European bridges, the Maria Pia Bridge and the Dom Luiz I Bridge in Porto/Portugal, the Viaduct of Garabit in France and the Ponte Michele in Northern Italy, is currently prepared. The five bridges were designed and built between 1875 and 1897, and they are all similar in terms of the technological and political ambition they were projected with. The Müngsten Bridge, at that time named ”Kaiser‐Wilhelm‐ Bridge“, included numerous innovative technical features concerning the design, the material as well as the applied construction methods and until today, the bridge is attributed with various legends. One of these legends deals with an engineer, who committed suicide because of false calculations or construction details, which he had contributed to the project. As Anton v. Rieppel is believed to be the only creator and designer of the ”Müngsten Bridge“, there was never a reason for doubting his predominance. Recently found historical sources however, name in fact another person who was supposed to be involved in the Müngsten Bridge project and could be another protagonist. Before working for the company, responsible for the design and construction of the Müngsten Bridge, he was a known engineer in 19 th century steel bridge design with a large engineering expertise among eight wide span bridges over River Rhine. He died in a natural way, shortly after completion of the bridge in 1897. These facts and the situation, that he was consistently concealed in the context of the Müngsten Bridge, point at special circumstances, which lead to the complete obliteration of his lifework in professional public.
    Type of Medium: Online Resource
    ISSN: 0038-9145 , 1437-1049
    URL: Issue
    RVK:
    Language: German
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2159000-X
    detail.hit.zdb_id: 240072-8
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  • 10
    Online Resource
    Online Resource
    Wiley ; 2023
    In:  Stahlbau Vol. 92, No. 1 ( 2023-01), p. 49-53
    In: Stahlbau, Wiley, Vol. 92, No. 1 ( 2023-01), p. 49-53
    Abstract: The Luisenturm on the Atzelberg In the context of the construction of a replacement for the Luisenturm tower on the Atzelberg near Kelkheim‐Eppenhain in the Taunus region, a steel structure is replacing the previous wooden observation tower. The 27 m high structure is characterized by slender load‐bearing elements made of curved steel tubes, which are manufactured and joined using the off‐knot construction method, whereby the joints are located outside the beam intersections, leaving the fully welded knots free of additional plates, joint parts and bolted connections. The pipe joints consist of four‐part, fit‐formed plates made from round pipe sections, which are screwed on internally and can only be seen by looking at the butt joint and the screw heads on the outside. The novel construction method emphasizes the filigree of the supporting structure and sets an elegant accent in the surrounding mountainous landscape of the Taunus.
    Type of Medium: Online Resource
    ISSN: 0038-9145 , 1437-1049
    URL: Issue
    RVK:
    Language: German
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2159000-X
    detail.hit.zdb_id: 240072-8
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