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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.16: Poster

Monday, March 26, 2012, 17:00–19:00, Poster B

Finite element based fatigue predictions for Thermal-Acoustical-Protective-Shields — •Martin Kollenrott and Othmar Marti — Department of Experimental Physics, Ulm University

In the engine compartment more and more temperature-sensitive parts are being used. Thermal-Acoustical-Protective-Shields (TAPS) protect these parts from high temperature impact. TAPS are exposed to different periodic forces and temperatures mainly induced by the engine. The subject is to guaranty the lifetime resistance against fatigue of the part. In the ongoing project a finite element based model for fatigue of TAPS has to be developed.

To predict durability, dynamic and forming stresses are important. For a dynamic stress prediction it is necessary to determine loss factors for the 3-D formed thin sheet metal layers. These measurements are performed with a laser-vibrometer with impulsive or vibratory excitation of the parts. To determine forming stresses, finite element based forming simulations are performed. A Woehler curve depending on the pre-stressed material at the previous forming process is used for every node in the finite element mesh to predict cracks.