METHOD OF MECHANICAL CRACK-RESISTANCE TESTING OF METAL MATERIALS Russian patent published in 1994 - IPC

FIELD: test equipment. SUBSTANCE: two similar specimens (standard and test ones) are subjected to testing. The standard specimen is subjected to loading at temperature T₁, and stress σ_k in specimen material corresponding to the beginning of breaking is determined, the test specimen is subjected to a successive influence of loading at temperature T₁ (up to stress σ_u, determined from relation σ_u=/0,7-0,9/σ_k is specimen material, unloading, heating to preset temperature T₂) and loading up to breaking; the number of cracks at the fracture of specimen material is selected as the parameter indicating the crack resistance, and temperatures T₁ and T₂ are determined from conditions T₁≥ 0,9T_fl and T₂≥ T_fl respectively, where T_fl - lower boundary of temperature of friable-tough transition of the material under testing. EFFECT: widened field of application owing to possibility of testing of single crystals of accounting of the influence of high temperatures. 3 dwg, 1 tbl