PROCEDURE FOR DETERMINATION OF MECHANICAL PROPERTIES OF METAL SAMPLES Russian patent published in 2010 - IPC G01N3/44 

FIELD: machine building.

SUBSTANCE: procedure for determination of mechanical properties of metal samples consists in tension of samples in gaining tensile-test diagram σ(ε) in coordinates σ - ε, in pressing indenter into tested sample under measuring pressure P_MEAS, in recording indenter impression and in obtaining experimental diagram of impression. On base of the tensile-test diagram there is calculated a theoretical curve of impression P(h)_T in coordinates P - h by the method of finite elements. Also there is continuously measured and simultaneously recorded measuring load P_MEAS and depth of indenter impression. Notably, load is measured directly on the indenter and load is been changing in time t according to a linear programme at a constant speed 0≤P_MEAS=kt≤P_LIM where k=dP/dt - speed of load change, t - is time of a measuring process. There is plotted the impression diagram P(h)_E in coordinates P-h on points of inflection of which there are determined mechanical properties: coefficient of elasticity E, hardness, hardening during deformation , yield point σ_T, and ultimate stress limit σ_V. The experimental and theoretical impression curves are matched and there is determined a correlation association between points of inflection of the diagrams and parametres determining mechanical properties. Thus, there are evaluated mechanical properties and conformance of the samples.

EFFECT: raised efficiency of procedure owing to expanded functionality.

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