Abstract
The study is devoted to a perspective diagnostic method, which makes it possible to deal with diagnostic tasks – the acoustic non-destructive inspection method based on acoustic emission (AE) signal parameter analysis. The practical use of this method is related to the interpretation of diagnostic measurement data. The parameters of acoustic emission (AE) signals were measured during bench tests of the tail boom structure and fin, as well as the joint areas of the fin, tail boom, and fuselage of the helicopter (joint area No.1 and No.19, frames of the tail boom and fuselage respectively).The analysis of fatigue damage kinetics was carried out in several stages for groups of bolts and for characteristic structure loading intervals. Bolt fracture was predicted at least 26 to 44 flight hours before the actual collapse. Using the AE parameters, the micro crack origin intervals identified when the bolt bearing capacity after the occurrence of the damage reached 96%.
Highlights
Aviation structure failures are mostly related to fatigue damage accumulation and fatigue crack development (Lingelli 2009; Shanyavskiy 2003)
Regarding structure load-bearing capacity, when a large part of its resource construction material is being operated with defects, but the exploitation time is determined by defect development time until its critical dimensions, methods that make possible to detect the defects at an early stage and to predict the resources of the remaining structure with cracks become actual
A perspective diagnostic method which makes it possible to deal with such a task type is the acoustic non-destructive inspection method based on acoustic emission (AE) signal parameter analysis (Urbahs et al 2012, 2015)
Summary
Aviation structure failures are mostly related to fatigue damage accumulation and fatigue crack development (Lingelli 2009; Shanyavskiy 2003). One of the most important issues in assessing fatigue is the development of scientifically based methods for fatigue damage evaluation and longevity calculation of structural elements in variable voltage conditions. Using such methods, it is possible to choose the optimum shape and size of the design at the design stage and to control the real process of damage accumulation in structures during exploitation. The practical use of this method is related to the interpretation of the diagnostic measurement data
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