PROCESS OF DETERMINATION OF YIELD POINT OF MATERIALS Russian patent published in 1997 - IPC

FIELD: study of materials. SUBSTANCE: tested material is located with the aid of spherical indenter having diameter D. Parameters of impression are measured after removal of load. In this case material with Poisson's ratio μ₂ is used, value of load is in range corresponding to measurement of hardness. Before determination of yield point contact modulus of strengthening of tested material and intensity of deformation ε_i,o in center of impression are found from relationship and yield point σ_0,2 is determined with allowance for intensity of deformation in center of impression from relationship , where σ_0,2 is yield point of tested material; ε_i,o is intensity of deformation in center of impression; P is load on indenter; d is diameter of residual impression; D is diameter of spherical indenter; μ₂ is Poisson's ratio of tested material; H is contact modulus of strengthening of tested material; b is coefficient depending on chemical composition of tested material. EFFECT: increased accuracy and authenticity of process. 1 tbl