DETERMINATION OF LONG OBJECT BENDING STIFFNESS WITH HELP OF CURVATURE GAGE Russian patent published in 2014 - IPC G01M5/00 G01N3/20 

FIELD: test equipment.

SUBSTANCE: object is secured in cantilever at bearing column to use mechanical curvature gage for measurement of object curvature at its separate sections at objected bending under preset load applied to its free end. Curvature of separate parts in different cross-sections over the object length is measured by sequential transfer of curvature gage from cross-section to another one along reference washers, first, at initial flexed state under initial load and, then, at flexure after application of preset extra load curvature of every section corresponding to appropriate bending moment is defined as the difference between curvatures measured at two said strained states of the object. Bending stiffness at design cross-section is defined as the quotient of division of bending moment at section mid cross-section by measured curvature multiplied by correction factor. The latter is predetermined by calculations of known functions of nominal bending stiffness distribution set at tests as the relationship between nominal mean curvature to that at object mid section.

EFFECT: higher accuracy, lower labour input.

2 cl, 4 dwg