METHOD FOR DETERMINING CHARACTERISTICS OF MATERIAL CRACK RESISTANCE Russian patent published in 2023 - IPC G01N29/14 

FIELD: measuring technology.

SUBSTANCE: invention can be used to determine the crack resistance characteristics of objects made of metallic materials. Essence: laboratory samples of metal materials with an existing crack are loaded, the total number of acoustic emission signals is simultaneously recorded and the crack resistance of the material is assessed by identifying characteristic areas on the time dependence of the total number of pulses. When a crack initiates and its stable growth begins, a linear section is identified on the graph of the logarithm of the total number of signals versus time, where its angle of inclination is determined, and then the strength parameters are calculated, which characterize the accumulation of damage to the sample and take into account its individual structural features, after obtaining a stable value the slope angle of the logarithm of the total number of pulses, the load is removed from the sample, and the value of crack resistance is calculated using the formula. The obtained value of the crack resistance of a solid sample is compared with the current value of the stress intensity factor at the crack tip, after which a conclusion is made about the residual strength and the ability of the material to resist crack propagation.

EFFECT: ability to determine the crack resistance of a material.

2 cl, 1 dwg