FIELD: physics.
SUBSTANCE: model is made from material similar to material of the structure. The model is loaded step-by-step in the elastic region. Its microhardness is repeatedly measured on each loading step. Variance of the microhardness measurement results is calculated. A curve of microhardness variance versus stress in the model is plotted. Microhardness of the structure is repeatedly measured. Variance of values of microhardness of the structure is calculated and stress in the structure is determined using the said curve.
EFFECT: increased accuracy of determining mechanical stress in the elastic region of loading the structure.
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