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No abstract

The paper describes the experiments aimed at the extension of the method early proposed for the uniaxial fatigue monitoring to the multiaxial modes of loading. The common denominator for both methods approach is based on the possibility of computer‐aided optical analysis of extrusion/intrusion structure, called often surface deformation relief, to be used for quantitative assessment of accumulated fatigue damage and remaining life. Experimental data obtained under the different modes of loading are presented and described as well as some objectives for the future activities are outlined.

620.179.1 and T. P MaslakWe present the results of our study aimed at development of a computerized optical method of evaluation of the accumulated fatigue damage. We show a possibility of predicting the residual resource of aircraft components made from clad aluminum alloys by the deformation relief of their surface near stress concentrators. For the quantitative estimation of deformation relief we use the parameters which characterize its saturation and fractal dimension.

The characteristic informative parameters for defect detection to be used in fatigue sensors have been established. Their development is interpreted in terms of scale levels of deformation and fracture. Damage accumulation of the sensor's surface tends to exhibit the self-organization nature. It is accompanied by formation of "folded" strain-induced relief on the surface. The mechanisms of damage accumulation under cyclic deformation were analyzed with the use of the multiscale approach.