METHOD OF DETERMINING DEFORMATIONS, STRESSES, FORCES AND OPERATING LOADS IN ELEMENTS OF OPERATED METAL STRUCTURES Russian patent published in 2020 - IPC G01L1/06 

FIELD: defectoscopy.

SUBSTANCE: invention relates to non-destructive testing of deformations, stresses, maximum forces and operating loads in elements of operated metal structures. Method consists in the following: theoretically or experimentally detecting the place (section) with the greatest deformations in the element of the metal structure from the operational load. Cross-section is reinforced with welded straps with a hole and rounded ends for reduction of stress concentration located along load-bearing lines of the bearing element of the structure, with thickness equal to not less than thickness of rolled metal element of the metal structure. Then in places with maximum deformations on the upper and lower faces of the cross-section of the bearing element of the structure, 3-4 resistance strain gages are installed through the cover hole, insulated with polymer glue in order to remove influence of external effects during tests and their ohmic resistance is measured. Then, in the element with resistance strain gages holes are drilled between resistance strain gages with diameter equal to 3-4 values of resistance strain gages width, at distance from resistance strain gages equal to two diameters of holes, and the structure during holes drilling is cooled by known methods, for example water or lubricating-cooling liquids, in order to remove temperature effects, after drilling of holes, ohmic resistances of resistance strain gages are measured again and the greatest value of deformation is determined by all results of measurements of resistances of resistance strain gages, through which maximum stress and bending moment is calculated in bearing element of structure.

EFFECT: maintaining residual carrying capacity of bearing element, improving safety of tests and maintaining continuity of operation of structure.

1 cl, 2 dwg