Abstract
The complexity of analytical and experimental estimation of aircraft components fatigue life is determined by the irregular character of the load’s sequence, a number of stress concentrators, multiaxial stress state. Proposed early multiaxial fatigue criteria are aimed to reduce the complex multi axial loading to an equivalent uniaxial loading. These criteria cover different categories of metals but taking into account the wide variety of constructional materials, modes of loading, environmental conditions, the instrumental structural health monitoring looks a reasonable alternative or at least a strong complement to existing multiaxial fatigue analysis procedures. The new criterion has been proposed as a result of multi-scale levels study of metal surface transformation under fatigue.
Highlights
Damage Tolerance concept currently used in aviation relies on the knowledge of the individual aircraft fatigue damage and the possibility to predict the further process of the fatigue damage accumulation and fracture
The information about the accumulated fatigue damage of the aircraft is valuable for the implementation of the Limit of Validity (LOV) concept developed for aging aircraft
Existing methods for multiaxial fatigue assessment do not cover all possible combinations of stresses; empirical methods of accumulated fatigue damage assessment combined with adequite nondestructive inspection of metal state are demanded
Summary
Damage Tolerance concept currently used in aviation relies on the knowledge of the individual aircraft fatigue damage and the possibility to predict the further process of the fatigue damage accumulation and fracture. The information about the accumulated fatigue damage of the aircraft is valuable for the implementation of the Limit of Validity (LOV) concept developed for aging aircraft. Neither analytical calculations nor full-scale tests do not provide with confident data concerning accumulated fatigue damage for individual aircraft in operation. As a result of bending and twist, pressurization and accidental loads, the normal and shear stresses arise in phase and out of phase modes, causing fatigue damage of the unpredictable value. Existing methods for multiaxial fatigue assessment do not cover all possible combinations of stresses; empirical methods of accumulated fatigue damage assessment combined with adequite nondestructive inspection of metal state are demanded
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