Abstract
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. KEYWORDS. Defects; Fatigue sensors; Damage; Aviation.
Highlights
T here is a number of physical backgrounds that explain the nature of an ordered surface relief formation including ones based on the principle of self-ordering [1,2,3]
The basic regularities of damage accumulation in specimen simulating the operation conditions of the fatigue sensors made from D16AT aluminum alloy are revealed
With the use of the automated data processing of digital images to illustrate the damaged surface the curves describing the kinetics of damage accumulation under bending and "bending + torsion" loading schemes were constructed
Summary
T here is a number of physical backgrounds that explain the nature of an ordered surface relief formation including ones based on the principle of self-ordering [1,2,3]. This numerously experimentally proved evidence testifies for the fact that surface layer of the material is the most "sensitive" in order to be used for characterization the kinetics of damage accumulation at various loading modes [8, 9] These above mentioned properties of material self-organization are widely used at development of instrumental techniques for fatigue fracture diagnostics of aircraft structures [10,11,12]. Various parameters which are used for describing strain induced surface relief in structural aluminum cladded alloys being formed under cyclic loading are employed They typically depend on the nature and accumulation mechanisms of deformation structures at the material surface. The aim of the study is establishing the basic principles of damage accumulation on the fatigue sensor surface under cyclic bending and “bending + torsion” loading schemes
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