TY  - THES
A1  - Linne, Stefan
T1  - Lösbare kraftschlüssige Verbindungen für modulare Bauwerke aus Faserverbundkunststoffen
T1  - Solvable force-fit joining technology for modular structures made of fiber reinforced polymers
N2  - In der vorliegenden Arbeit wird eine kraftschlüssige Verbindungstechnik für modulare, schalenartige Faserverbundbauteile vorgestellt. Die Verbindung basiert auf der Verklebung mit lokal begrenzten Stahlblechen. Aus dem Verbindungsansatz wird die Verklebung zwischen Stahl und Faserverbundkunststoff vertiefend betrachtet. Ziel sind die Wahl von technologischen Randbedingungen, die Erarbeitung eines Vorschlages zur numerischen Berechnung und Bemessung und die Formulierung konstruktiver Empfehlungen zum Entwurf von Verklebungen. Mechanische Kennwerte werden in Zugversuchen ermittelt und direkt auf die nichtlinearen Berechnungen übertragen. Technologische Einflüsse und die Streuungen aus realen Verklebungen werden über die Nachrechnung von Zugscherversuchen in die Bemessung integriert. Es wird gezeigt, dass die Verklebungen ausreichende Festigkeiten und ein zufriedenstellendes Bruchverhalten aufweisen. Die Kombination aus einer Werkstattverklebung und einer baustellengerechten Montage ermöglicht eine materialgerechte und effiziente Verbindungen für Faserverbundkonstruktionen unter den Randbedingungen des Bauwesens.
N2  - In this thesis, a force-fit joining technology for modular, shell-like fiber reinforced polymer structures is presented. The connection is based on a local reinforcement with steel sheets with an adhesive bonding to the polymer. The focus of this work is to investigate the adhesive bonding between steel and fiber reinforced polymers. A general concept for the selection of technological constraints as well as suggestions for the numerical analysis and recommendations for the engineering design of the connections are developed. The mechanical properties are experimentally termined by tensile tests. These results were directly incorporated into the nonlinear numerical analysis. Parameters describing technological influences and the stochastic scatter of real bondings were integrated into the analysis by fitting numerical simulations with the experimental data. It is demonstrated that the bondings have a sufficient strength as well as a satisfactory fracture behavior. Furthermore, it is shown that the combination between an adhesive bonding realized off-site and a robust on-site assembly enables the construction of reliable and efficient joints that take into account the specific constraints on a construction site.
KW  - Verbindungstechnik
KW  - Kleben
KW  - Kunststoffkleben
KW  - Metallkleben
KW  - Fügen
KW  - Kraftschluss
KW  - Oberflächenvorbereitung
KW  - Zugversuch
KW  - Direkte numerische Simul
KW  - materialgerecht
KW  - modulares Bauwerk
KW  - lösbare Verbindung
KW  - Kraftschluss
KW  - Klebtechnologie
KW  - MFPA Weimar
KW  - fiber reinforced polymer
KW  - adhesive bonding
KW  - joining
KW  - force-fit
KW  - numeric analysis
KW  - finite element method
KW  - material properties
KW  - fracture behavior
Y1  - 2010
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20110831-15547
ER  - 
TY  - JOUR
A1  - Motra, Hem Bahadur
A1  - Hildebrand, Jörg
A1  - Dimmig-Osburg, Andrea
T1  - Assessment of strain measurement techniques to characterise mechanical properties of structural steel
JF  - Engineering Science and Technology, an International Journal
N2  - Strain measurement is important in mechanical testing. A wide variety of techniques exists for measuring strain in the tensile test; namely the strain gauge, extensometer, stress and strain determined by machine crosshead motion, Geometric Moire technique, optical strain measurement techniques and others. Each technique has its own advantages and disadvantages. The purpose of this study is to quantitatively compare the strain measurement techniques. To carry out the tensile test experiments for S 235, sixty samples were cut from the web of the I-profile in longitudinal and transverse directions in four different dimensions. The geometry of samples are analysed by 3D scanner and vernier caliper. In addition, the strain values were determined by using strain gauge, extensometer and machine crosshead motion. Three techniques of strain measurement are compared in quantitative manner based on the calculation of mechanical properties (modulus of elasticity, yield strength, tensile strength, percentage elongation at maximum force) of structural steel. A statistical information was used for evaluating the results. It is seen that the extensometer and strain gauge provided reliable data, however the extensometer offers several advantages over the strain gauge and crosshead motion for testing structural steel in tension. Furthermore, estimation of measurement uncertainty is presented for the basic material parameters extracted through strain measurement.
KW  - Baustahl
KW  - Werkstoffprüfung
KW  - Zugversuch
KW  - Affecting factors; Measurement uncertainty; Materials testing; Quantitative comparison; Strain comparison; Tensile test
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170425-31540
SP  - 260
EP  - 269
ER  -