GLUED JOINT CREEP TEST METHOD AT SHEAR AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC G01N3/24 G01N19/04 

FIELD: test technology.

SUBSTANCE: invention relates to determination of mechanical and rheological properties of adhesive compositions. Glued sample is placed in the cage, tested for creep, current values of deformation of the adhesive composition are recorded and a creep curve is plotted, from which creep characteristics of the adhesive composition are determined, current value of deformation of adhesive composition is recorded by distance between lens and glass plate by Newton rings method, observed in monochromatic light by means of digital microscope connected to personal computer (PC) for their processing, at normal to surface of plate light rays fall. Device comprises a sealed chamber accommodating a cartridge for installation of glued specimens, a lever for loading samples with balancing weights, a temperature control device with a temperature sensor with digital display of the current temperature in the chamber and a heater. In the chamber there are valves for supply and discharge of cooling liquid for low-temperature tests. Glass plate is located on the lever. Lens is placed on the post on one optical axis with a monochromator and a digital microscope; the lens and the glass plate are illuminated with a point light source. Loading of glued samples is performed by standard weights placed on lever, registration of Newton rings is carried out with a digital microscope with subsequent transmission of video signal to PC in discrete or continuous modes, and in PC using software analysis of video image of Newton rings with subsequent construction of curve "creep deformation – loading time".

EFFECT: high accuracy and reduced labor intensity of measuring creep when testing lapping compositions.

2 cl, 1 dwg