METHOD OF CONTROLLING STRENGTH OF COMPOSITE REINFORCEMENT ROD AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC G01N3/12 G01N3/24 

FIELD: construction.

SUBSTANCE: invention relates to methods and devices for determining strength of a building composite reinforcement rod in process of its production to ensure control of stability of technological process and compliance with certification indicators recorded during inspection of production conditions. Method comprises sampling, execution of successive stepped grooves and collars at ends of grooves thereon, loading of collars with increasing load and registration of load-displacement values. Shoulder shift is performed towards sample compression while maintaining perpendicular position of bead butt to shear force direction. Actual values of maximum values of adhesion forces F_af for equal width of bead h_b are arranged for different values of shear diameters d_{sh i}, per conversion unit perpendicular to barrel body conjugation surface, then successively varying width values of bead h_b towards increase and decrease by fixed value +Δh_b and -Δh_b, corresponding values F_af and, comparing obtained results, determining stability of strength characteristics of rod along axis "X" of sample, determining proportionality of change in adhesion force F_af width of bead width h_b, and the layer depth from the periphery to the rod center along the "R" coordinate, determining proportionality of the adhesion force change F_af value of diameters of shift d_{sh i}. Device comprises base, mounted on it movable support with power drive and cam sample clamp and fixed strain gage, between strain gage and stepped end of sample there is a holder with cylindrical sockets, in each of which a pusher is mounted, equipped on the sample side with an annular stop, the inner diameter of which coincides with the test diameter of shift d_sh, and on the side of strain gage with spherical tip.

EFFECT: possibility of operative control of the composite rod manufacturing quality in production conditions along the layer depth along the radius R of the rod and length along the fibers along the X axis of the rod, with increased efficiency and accuracy of measurements.

6 cl, 9 dwg