Open-Access-Journals @ Otto-von-Guericke-Universität Magdeburg
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Die Lösung ausgewählter Randwertaufgaben der Kontinuumsmechanik mit einer Finite-Element-Methode auf der Grundlage der Methode der kleinsten Quadrate
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Kritik an der Theorie von Corten-Dolan und Schlußfolgerungen für den Betriebsfestigkeitsnachweis
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Berechnung von Wärmeübergangskoeffizienten einer verdampfenden Zweiphasen-Kanalströmung
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Theoretischer Beitrag zum deformationsmechanischen Verhalten mehrschichtiger Verbundplatten unter Berücksichtigung von Schereffekten
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Zur Behandlung dünnwandig geschlossener Konstruktionen mit einer verallgemeinerten halbmomentfreien Schalentheorie nach Wlassow
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The effect of the skin-core structure of injection-molded isotactic polypropylene on the stress distribution in bending tests
No full textWe examine the effect of the skin-core structure of isotactic polypropylene (iPP) in bending tests. The depth-dependent material properties are determined in tensile tests and mapped to a finite element model. This enables the examination of internal stresses during bending numerically. In a bending test, one usually expects a monotonic stress distribution across the thickness, provided that the material is homogeneous and does not strain-soften. We found that the structural gradient of injection-molded iPP easily overcompensates the monotonic stress dependence, such that the maximal equivalent von Mises stress lies well below the surface in the so called shear layer. The latter is a result of the injection molding process
Mathematical modeling and analysis of elastic waves in a thermo piezoelectric multilayered rotating composite rod with LEMV/CFRP interface
No full textIn this present paper, we form the mathematical model for wave propagation in a thermo piezoelectric multilayered rotating composite rod made of inner and outer piezoelectric layer bonded together by Linear Elastic Materials with voids (LEMV).To uncouple the equation of motion, electric and heat conduction equations, displacement potential functions are introduced. The frequency equations are obtained for longitudinal and flexural modes of vibration and are studied numerically for heat conducting PZT-5A material.The computed non-dimensional frequency is presented in the form of dispersion curves against various physical quantities. Adhesive layer Linear Elastic Materials with Voids (LEMV) is compared with Carbon Fibre Reinforced Polymer (CFRP).We found that the frequency wave characteristics are more stable and realistic in the presence of thermal, electrical and the rotation parameters
Simulating and Evaluating Synchronized Vibrations in Macroscopic Tribological Contacts
No full textHigh-frequency synchronized vibrations in the friction contact constitute one known triggering mechanism of certain types of NVH phenomena in automotive brakes. Towards an improved understanding of the associated physical processes, vibrations of contact patches in the tribological boundary layer are computed using the Abstract Cellular Automaton simulation program. Various studies are presented, each illustrating unique types of local phenomena and observable global behaviors. For example, simulations are carried out on multiple timescales, enabling investigations into the emergence of global patch coverage states and the resulting vibrational behavior in the tribological contact. Relevant means for analyzing and interpreting these results are introduced, including a qualitative visual representation scheme, frequency analyses of the global coefficient of friction, and a new method for quantifying the synchronization of multiple oscillating bodies