METHOD OF MANUFACTURING OF VOLUME STRAINS CAST DATA UNIT Russian patent published in 2009 - IPC G01B7/16 B29C39/10 

FIELD: physics, measuring.

SUBSTANCE: invention concerns field of measuring technics, to a resistive strain measurement, has the immediate relation to methods of fastening of measuring devices in materials of natural objects. The technical effect is reached by the method of manufacturing of the cast data unit of the volume strains, consisting that place the socket of resistance strain gauges in a model body, flood epoxy compound with powder additives from a material of model with the sizes of particles -10 - 20 microns, in quantity (4.0 - 4.5): 1 to mass of tar also fix at the conventional viscosity epoxy compound equal 60 - 70 s. Thus the spatial multicomponent socket of resistance strain gauges of cruciform traversal section is mounted in modular devices of the foundry cylindrical shape on object model. Then fill up resistance strain gauges layer by layer, on builders of the spatial socket the fused metallised composite from the polymeric material chaotically reinforced by high-modulus threadlike fibrils 25 - 35 microns in diameter and length of 1-10 mm, in number of 40...60 % to polymetric compound volume. Further create an orientation of threadlike fibrils on orthogonal planes of the socket, serially influencing on stratums of the fused composite in the field of a magnet packages of electroimpulses of voltage amplitude 25 - 30 V, duration 5 - 15 s with frequency of following 0.05 - 0.1 Hz and pulsing modulation 100 - 150 Hz. Thus fixing of an one-orientation of threadlike fibrils in directions of datums of spatial resistance strain gauges carry out layer by layer, under the control of decrease in temperature of a composite not more low 35 - 45°C. And it is consecutive, on socket builders in model volume form in crossly perpendicular directions the reinforced high-modulus fibrils the rigid layers. These layers after solidification are filled up with a warmed-over homogeneous intermixture from a polymeric material, and the complete solidification of mass is reached after 24 h at temperature of 20°C, then the cast data unit is taken from the cast.

EFFECT: expansion of technological possibilities of manufacturing and improvement of quality of the cast data unit, and also increase of accuracy and reliability of measuring of volume strains.

7 dwg