METHOD FOR DETERMINING FATIGUE CRACK GROWTH RATE IN VACUUM Russian patent published in 2023 - IPC G01N3/32 

FIELD: gas turbine engines.

SUBSTANCE: testing machine parts and a method for determining the rate of crack growth from cyclic loads in samples made from materials used primarily in gas turbine engines. The method includes cyclic loading with a constant load amplitude on a sample with an embedded defect, measuring crack growth and determining the fatigue crack growth rate. To determine the growth rate of a fatigue crack from internal defects in a vacuum, a sample with an embedded defect in the form of a flat tablet located inside the sample transverse to its longitudinal axis is used, with cyclic loading performed until the sample fails. A cylindrical sample is used as a sample. A sample with an embedded defect in the form of a flat cylindrical tablet is used. Crack growth is measured using the electrical potential difference method. A sample with an embedded defect is obtained by isostatic pressing of granulated alloys. Use a sample with a cross-sectional area that provides a maximum stress in the fracture section not exceeding 0.8 of the yield strength of the sample material. After destruction of the sample, the crack growth rate is determined by fractographic method.

EFFECT: obtaining the growth rate of a fatigue crack in a vacuum without using a vacuum chamber.

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