METHOD OF DIAGNOSING FRACTURE FORMATION IN METAL STRUCTURES Russian patent published in 2009 - IPC G01N21/88 G01N3/32 

FIELD: physics, measurement.

SUBSTANCE: invention relates to control instrumentation and can be used for diagnostics of fracture formation and forecasting a residual operating hours of metal structures before formation of macro fractures in strain concentrations zones that are subjected to loading under conditions of cyclic elastoplastic or plastic deformation. The proposed method comprises the steps that follow. The most probable points of metal structure breakage are determined, check sites surfaces are analysed and degree of damage is defined. Note that two or more reference lines are marked on the check sites surface nearby the strain concentrator, in parallel to expected development of the fracture and at equal distance from each other. Now, a number of checks of metal structures under control are consecutively effected, in a present number of cycles consisting in measuring the distance between reference lines and defining the degree of damage from the change of the said distance.

EFFECT: expanded application of fracture formation diagnostics in metal structures with their elements being subjected to plastic or elastoplastic deformation.

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