Objective
We propose to use the new multi scaling approach for estimation of fatigue damage and prediction of exhaustion of working resource of the welded aircraft components made of aluminium alloys. For this purpose we propose to analyse the surface pattern of plastically deformed aluminium pure single crystal foil (indicator) rigidly attached to welded aluminium alloy specimen under fatigue. It is assumed that this surface pattern is caused by plastic deformation of the foil under influence of strains in underlying aluminium alloy specimen with welded joint. Firstly, by this way one could construct the correspondence between the strain localisation field in underlying specimen and surface relief of the foil attached. Secondly, on this basis one can obtain the indirect gauge for calibration of fatigue history of underlying specimen with welded joint and estimation of its fatigue damage and level of exhaustion of working resource.
Our previous investigations have shown signs of multi scaling properties of surface relief on indicator attached to aluminium alloy specimens: self-similar patterns can be observed on different scale ranges, self-similarity range is changing with a change of loading conditions, quantitative multiscaling characteristics modify with time and with a change of loading conditions. That is why we intend to concentrate our attention on several spatial and temporal scales and we would like to apply multicscaling approaches (fractal, multifractal and wavelet analysis) widely used in many applications for characterisation of objects of complex geometry with signs of self-similarity. In fact, natural systems hardly can be described by simple unified pan-scale approach, because such a rigorous case is a domain of pure mathematics. However, seemingly chaotic natural phenomena can be characterised by this multiscaling analysis with taking into account "relay-race" of different mechanisms and processes operating at different ranges of space-time scales.
In addition to this the modern approaches in simulation of pattern formation processes provide the more powerful and useful methods for investigation and verification of conditions of critical regimes, their universal exponents and evolution scenarios. That is why we will carry out thorough simulations of several schemes of the pattern formation processes.
In general, this approach could allow us not only avoid misleading direction of investigation of critical regimes in fatigued metals by standard linear approaches without taking into account new concepts of modern physics, but elaborate the substantially new technological idea about prediction of fatigue life of welded aircraft components made of aluminium alloys.
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Coordinator
29071 Malaga
Spain
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