DEVICE FOR ANALYZING ELASTIC CONSTANT PLASTIC METALS WITH LOW PLASTICITY AND ALLOYS AT HIGH TEMPERATURE Russian patent published in 2018 - IPC G01N3/08 

FIELD: measurement technology.

SUBSTANCE: invention relates to the analysis of strength properties of materials by optical measuring means by applying compressive static loads to them. Device comprises a base with a fixed plate and a movable plate. Laser, beam splitter and mirror are arranged on the base, the former are used to divide the laser radiation into two beams, directed to interferometers of longitudinal and transverse deformations. Four-way longitudinal strain interferometer includes a polarized beam splitter, two retro-reflectors, a quarter-wave and a polarization plate. In its working arm there is a mirror-polished surface of the movable plate facing the fixed plate, and two mirror-polished inclined at an angle of 45 degrees of the surface of the fixed plate, whose centers are in the same plane with the longitudinal axis of the sample being investigated symmetrically with respect to it. Eight-way transverse strain interferometer includes a polarized beam splitter, a quarter-wave and a polarization plate, a large and small retro-reflectors and ten bypass mirrors that guide the beam of the working arm onto the four mirror-polished lateral surfaces of the sample of rectangular cross-section. Electrodes connected to the direct current source are installed on the outer sides of the plates. Semiconductor layer is placed between one of the plates and the corresponding electrode. Semiconductor layer can also be placed between the second plate and the second electrode. Sample is placed between plates, preload is set, electric current is passed between the electrodes. After heating the sample, it is deformed, the loading force and temperature of the sample are continuously recorded with a thermocouple. Count of the displaced interference lines is made by means of two collimators, two diaphragms, two photodetectors and an electronic processing circuit, arranged successively after the interferometers along the reflected rays of the working arms.

EFFECT: increased accuracy of measurements of the elastic constants of low-plastic metals and alloys at high temperatures.

1 cl, 5 dwg