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.
    Physics Procedia 12/2015; 70:846-849. DOI:10.1016/j.phpro.2015.08.173
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    ABSTRACT: The use of Virtual Reality (VR) technology is a promising approach to eliminate crucial problems in assembly planning.
    12/2015; 37:152-157. DOI:10.1016/j.procir.2015.08.007
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    ABSTRACT: We study the heat-induced magnetization dynamics in a toy model of a ferrimagnetic alloy, which includes localized spins antiferromagnetically coupled to an itinerant carrier system with a Stoner gap. We determine the one-particle spin-density matrix including exchange scattering between localized and itinerant bands as well as scattering with phonons. While a transient ferromagneticlike state can always be achieved by a sufficiently strong excitation, this transient ferromagneticlike state only leads to magnetization switching for model parameters that also yield a compensation point in the equilibrium $M(T)$ curve.
    Physical Review B 03/2015; 91(10). DOI:10.1103/PhysRevB.91.100402


  • Address
    Gottlieb-Daimler-Str., 67653, Kaiserslautern, Rheinland-Pfalz, Germany
  • Head of Institution
    Prof. Dr. Helmut J. Schmidt
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