METHOD OF ESTIMATING MECHANICAL CHARACTERISTICS OF DEFORMED METAL OBJECTS Russian patent published in 2020 - IPC G01N3/44 

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used for evaluation of deformation degree of metal objects and investigation of strength properties of hard materials by application of mechanical forces. Inserting the indenter into one fixed point of the sample surface, incrementing the load on the indenter step-by-step in a given interval, determining coefficients a and n of the formula P=a⋅hⁿ by load dependence on penetration depth of indenter, deriving equation of dependence of mechanical characteristics on coefficients a and n. Billet of the same material as the analyzed deformed metal object is selected, which is annealed to an equilibrium state, samples are made from the workpiece for deformation, each of which is deformed through a given deformation step without intermediate annealing to the specified strain limit. After each deformation step, a tensile sample is made from each sample for deformation, in which an indenter is introduced before stretching, depth of introduction of the indenter is determined. Coefficients a and n are determined from the dependence of the load on the penetration depth. Stretching tensile test is carried out and determining their mechanical characteristics, degrees of deformation and mechanical characteristics are plotted against coefficients a and n. Coefficient of algebraic coupling of coefficients a and n is selected from the maximum value of reliability of approximation. Indenter is introduced into the surface of the section of the deformed analyzed object, the penetration depth of the indenter is determined, according to the load dependence on the penetration depth of the indenter into the object, coefficients a, n and an index of their algebraic coupling are determined, from which the degree of deformation and mechanical properties of the deformed analyzed object are determined based on previously plotted relationships.

EFFECT: wider field of use of micromechanical tests for any deformed metal object under study, uniformity and simplification of deformation preparatory operations, possibility of determining the degree of ultimate deformation of the analyzed object and prediction of the margin of its deformation before destruction.

8 cl, 10 dwg