Fatigue of Casting Components

18.6.2019

Seminar Fraunhofer IWM, 18. Juni 2019, Seminarraum des Fraunhofer-Instituts für Werkstoffmechanik IWM in Freiburg, Dr. Ali Fatemi, University of Memphis, USA

Details: 

 

Was:                        Seminar Fraunhofer IWM: Fatigue of Casting Components

Wann:                      18. Juni 2019, 15:00 Uhr

Wo:                         Seminarraum W11 des Fraunhofer Instituts für Werkstoffmechanik IWM in Freiburg

Vortragender:        Dr. Ali Fatemi, University of Memphis, USA

Abstract:

With improvements in casting technology, some castings are now used as alternatives to their wrought counterparts in some applications. However, a disadvantage of castings is the inevitable presence of defects, particularly porosity. In this presentation fatigue test results and models for a ductile cast iron and a high pressure die casting (HPDC) aluminum will be presented. For the ductile cast iron, un-notched and notched fatigue data with different levels of tensile and compressive mean stress resulting in a wide range of R ratios will be presented. Several mean stress correction methods for both un-notched and notched specimens using the commonly used nominal stress-based and local strain approaches will be discussed. High pressure die cast aluminum has been widely employed in many industries for its superb cast ability, productivity, flexibility and especially the high strength to weight ratio. This technology enables mass production of thin-walled, complex, intricate components with near net shape. Fatigue behavior of this material focusing the effects of porosity will also be presented. The effects of porosity level, specimen size, mean stress and stress gradient will be discussed. The use of fracture mechanics-based approach for life prediction will also be discussed.

Im Fraunhofer IWM-Seminar werden wissenschaftliche Themen zu den Arbeitsgebieten des Instituts vorgestellt. Die öffentlichen Vorträge finden im Seminarraum des Fraunhofer-Instituts für Werkstoffmechanik IWM in Freiburg statt. Gäste sind willkommen und erhalten Eintritt beim Empfang in der Wöhlerstraße 11.