Description of the cyclic material behaviour of aluminium wrought alloys as basis for a digital twin
Abstract
In order to consider the cyclic material behaviour during the design process of cyclically loaded components and safety relevant parts, the importance of local strain-based fatigue design approaches is growing continuously. For the damage impact of load‐time histories on components such as chassis parts, standard service loads with amplitudes settled in the High Cycle Fatigue (HCF) and Very High Cycle Fatigue (VHCF) regime, as well as overloads and misuse with load amplitudes in the Low Cycle Fatigue (LCF) regime, must be considered in order to perform a reliable fatigue life estimation. Therefore, a continuous fatigue life curve from the LCF up to the VHCF regime, which covers all relevant damage mechanisms, is required. In the case of aluminium wrought alloys the tri-linear strain-life curve, which has been developed and validated during previous research, enhances the accuracy of the mathematical approximation of test results. Due to this reason, the tri-linear strain-life curve is qualified for the integration into a digital twin, considering the requirements of fatigue and structural durability.
