Simulation von diffusiv/konvektiven Erstarrungsvorgaengen mit Finiten Elementen

The SMART finite element software was extended to the solution of thermally coupled flow processes with phase transition. This report shows that the three models presented have minor differences as far as the consideration of latent heat during the phase transition is concerned. The method of fictitious heat capacity has the advantage that it can be easily integrated into an existing program system. Due to the calculation of the capacity matrix, however, it requires in each iteration step a high CPU time, which of course has an increasing effect for major problems or high gradients at the phase limit. The FHFM is the method which most clearly shows the delay effect in the Weiner problem, but is more complicated to implement into existing codes. The enthalpy method still needs to extended to the - then secondary - unknown temperature. Here it is above all in respect to thermally coupled problems that the finite element method requires a further differentiation on the element level. The models for describing the flow behavior at the solidification front furnish a sufficient qualitative solution for the calculated cavern flow. (orig.)Available from TIB Hannover: RO 3493(47) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Eigenspannungsberechnung beim Mehrlagenschweissen mit der Methode der finiten Elemente

SIGLETIB Hannover: RO 3493(16) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

SMART II,2 - Instationaere Diffusion Benutzerhandbuch

TIB: RA 1115 (192) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Rechnerische Uebertragung von nichtlinearen und inelastischen Werkstoffvorgaengen auf das Verhalten von Kunststoffbauteilen nach der Methode der Finiten Elemente Abschlussbericht

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Finite Element-Berechnung von Schweisseigenspannungen und -verformungen

SIGLEAvailable from TIB Hannover: FR 5047 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Grasping devices and methods in automated production processes

In automated production processes grasping devices and methods play a crucial role in the handling of many parts, components and products. This keynote paper starts with a classification of grasping phases, describes how different principles are adopted at different scales in different applications and continues explaining different releasing strategies and principles. Then the paper classifies the numerous sensors used to monitor the effectiveness of grasping (part presence, exchanged force, stick-slip transitions, etc.). Later the grasping and releasing problems in different fields (from mechanical assembly to disassembly, from aerospace to food industry, from textile to logistics) are discussed. Finally, the most recent research is reviewed in order to introduce the new trends in grasping. They provide an outlook on the future of both grippers and robotic hands in automated production processes