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SPP 1036:  Mechanismenorientierte Lebensdauervorhersage für zyklisch beanspruchte metallische Werkstoffe

Subject Area Materials Science and Engineering
Term from 1997 to 2003
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 5468083
 
To achieve the necessary progress in lifetime prediction of metallic components which are subjected to fatigue loading, in this priority programme models are developed which base on the active fatigue mechanisms. These models, which are verified at specimens with homogeneous material and stress states, are later transferred to inhomogeneous conditions which are typical for components. In all corresponding works and developments the correlation between the microstructural fatigue mechanisms and the lifetime until the development of a macroscopic fatigue crack is presented. Until today, in this field the investigation of the microstructure was mainly used to identify and describe the fatigue mechanisms, whereas mechanical investigations mainly aimed at the lifetime prediction. It is the aim of this priority programme to lead these two directions together in order to improve the methods of fatigue lifetime prediction. On this background, projects are promoted which combine observed microstructural fatigue processes which lifetime predictions. The theoretical models vary from the application of crystal plasticity unto the stochastic description of microcrack propagation. The experiments are performed at metals with microstructures of technical relevance and components.
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