Abstract:

AE technique can be used to monitor the formation and development of fatigue cracks in steel structure dynamically and continuously. In this paper, a mathematical statistical model is established by analyzing characteristic parameters of AE data from aircraft. By using it, the authors make a study of AE data from an aircraft during its fatigue test and a fighter structure during its flight. On this basis, a practical damage standard is advanced, which can be applied to judge whether cracks are being formed or developed in an aircraft under given probability. At the end of the paper, the research orientations are given to the establishment of a more general standard.

Key words: acoustic emissio n, monit or, fat igue cr ack, mathematical statist ics