Lifetime evaluation of hot forged aerospace components by linking microstructural evolution and fatigue behaviour

AbstractThe present work aims at linking the local distribution of fatigue strength in a forged part to its manufacturing process. To this purpose, a predictive fatigue strength model for Inconel 718, also including the operating temperature, is derived from a reduced set of numerous microstructural parameters. The model is implemented, along with a microstructural evolution model from earlier work , into a finite element code in order to predict the local fatigue strength distribution in a component after being subjected to an arbitrary forging process

Combined numerical and experimental investigations on Fretting wear

AbstractIn mechanical engineering applications, cyclic loadings are most commonly seen. In many assemblies of moving components, contact problems under various lubrication conditions are lifetime-limiting. There, the relative motion of the contacting bodies combined with high loads transmitted via the contact surface leads to fretting fatigue and fretting wear failure. The present contribution gives first promising results within a long-term research project concerned with developing a methodological approach for the design and lifetime estimation of components under tribo-mechanical loading