Kaiserslautern, Rheinland-Pfalz, Germany

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    ABSTRACT: Hybrid lightweight structures shape the development of future vehicles in traffic engineering and the aerospace industry. For multi-material concepts made out of aluminum and titanium alloys, the ultrasonic welding technique is an alternative effective joining technology. The overlapped structures can be welded in the solid state, even without gas shielding. In this paper the conventional ultrasonic spot welding with longitudinal oscillation mode is compared to the recent ultrasonic torsion welding with a torsional mode at 20kHz working frequency. For each technique the process parameters welding force, welding energy and oscillation amplitude were optimized for the hybrid joints using design of experiments. Relationships between the process parameters, mechanical properties and related welding zone should be understood. Central aspects of the research project are microscopic studies of the joining zone in cross section and extensive fracture surface analysis. Detailed electron microscopy and spectroscopy of the hybrid interface help to understand the interfacial formation during ultrasonic welding as well as to transfer the gained knowledge for further multi-metal joints.
    Full-text · Article · Dec 2015 · Physics Procedia
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    ABSTRACT: The use of Virtual Reality (VR) technology is a promising approach to eliminate crucial problems in assembly planning.
    Full-text · Article · Dec 2015
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    ABSTRACT: Describing local system-reservoir interaction in a quantum kinetic approach allows a first-principles investigation of basic nonequilibirium effects in ultracold atomic vapors. We derive such a quantum kinetic theory and apply it to heat transport in a Bose-condensed gas coupled collisionally to two spatially separated reservoir gases at different temperatures. We show that in the collisionless regime, where a Bogoliubov expansion is applicable, heat is transported by counterpropagating steady currents of condensate and noncondensate fractions, with the condensate flowing towards the source of greater heat. This phenomenon has hitherto only be seen in more strongly interacting systems as superfluid helium and is known as superfluid internal convection. We derive explicit formulas for the steady-state energy current and differential particle currents (with zero net particle flux) in the collisionless regime. As a significant technical detail in this derivation, we show that a correct treatment of this nonequilibrium scenario requires the inclusion of post-Bogoliubov and nonresonant interaction effects. © 2015 American Physical Society.
    No preview · Article · Jul 2015 · Physical Review A


  • Address
    Gottlieb-Daimler-Str., 67653, Kaiserslautern, Rheinland-Pfalz, Germany
  • Head of Institution
    Prof. Dr. Helmut J. Schmidt
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Top publications last week by reads

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Food and Chemical Toxicology 02/2002; 40(2-3):193-236. DOI:10.1016/S0278-6915(01)00118-1
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