METHOD FOR NONDESTRUCTIVE INSPECTION OF STRENGTH OF METAL STRUCTURES Russian patent published in 2012 - IPC G01N29/14 

FIELD: physics.

SUBSTANCE: metal structure is loaded and the number of acoustic emission pulses and their amplitude is recorded. The parameter of the state of the material of the inspected metal structure Y_AE is determined and the value of the test parameter Y_R is calculated, and the value Y_AE is compared with Y_R to determine the hazard level of the source of acoustic emission pulses, wherein the metal structure is loaded at least twice, while raising the load and satisfying the condition P₁≥Q, where Q is nominal allowable load of the metal structure. After each load, the test load is raised 100-200 mm from the ground using the metal structure and then held for ≥10 minutes. Y_AE, the coefficient of reduction of the endurance limit K_EN.L, the endurance safety factor and the initial life are determined using corresponding mathematical expressions, after which the remaining life of the metal structure N_REM is found and a decision is made regarding further use of the metal structure.

EFFECT: high accuracy of acoustic-emission inspection of complex metal structures.

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