A single anomalous load instance within an otherwise constant amplitude fatigue loading train can be thought of as the simplest case of variable amplitude loading. It is therefore of fundamental importance to understand the mechanisms responsible for fatigue crack growth retardation or acceleration in these simple cases, before attempting to develop approaches for reliable prediction of crack propagation under variable amplitude conditions. In this study modern techniques, such as synchrotron XRD and FIB-SEM imaging, DIC analysis and FE modelling are used with the purpose of elucidating the main physical mechanisms contributing to crack growth rate alteration. In the case of an Overload we discuss an approach allowing the influence of different mechanisms to be separated, whilst in the case of a single compressive anomalous load (Underload) we highlight the extent to which the baseline cyclic deformation conditions at fatigue crack tip determine the subsequent growth scenario.
|Number of pages||2|
|Publication status||Published - 2017|
|Event||14th International Conference on Fracture, ICF 2017 - Rhodes, Greece|
Duration: 18 Jun 2017 → 20 Jun 2017
|Conference||14th International Conference on Fracture, ICF 2017|
|Period||18/06/17 → 20/06/17|