ACOUSTIC-EMISSION METHOD TO DIAGNOSE METAL STRUCTURES Russian patent published in 2015 - IPC G01N29/14 

FIELD: testing equipment.

SUBSTANCE: use: for diagnostics and non-destructive check of metal structures. The substance of the invention consists in the fact that parameters of acoustic emission signals are received, recorded and assessed at the moment of structure loading, acoustic signals are digitised, they are preliminarily processed, noise is filtered, at the same time they first establish critical values of the load P_cr and regression coefficient k_rc, which characterises variation of the number of acoustic emission signals to variation of the load for a non-defect structure, then the structure is loaded to the value of the load exceeding the working load by (5…10)%, at the same time they record the number of signals and the load of the linear section of stationary acoustic emission, at the same time they record the regression coefficient k₀, afterwards the structure is loaded by cyclic load, the amplitude value of which is exceeded gradually by (2…5)%, and whenever exceeding reaches (15…20)% above the working load, loading is stopped, if in the process of control k₀<k_rc, then the structure is considered to be free of defects, and if the value k₀>k_rc the structure is rejected.

EFFECT: improved validity of acoustic-emission control of metal structures.

3 cl, 4 dwg, 4 tbl