METHOD AND DEVICE FOR MEASURING VOLUME OF CLOSED AND OPEN PORES OF FOAMED MATERIALS Russian patent published in 2005 - IPC

FIELD: testing engineering.

SUBSTANCE: method comprises suspending the specimen of the material in air, measuring its volume, setting it in the pressure-tight measuring chamber that can be in communication with the atmosphere, evacuating the chamber, and measuring the weight of the specimen after evacuation. The volume of closed pores is determined from the formula V_cl = ΔG_sp/ρ_air - G_sp/ρ_fr, and the volume of open pores is determined from the formula V_op = V - ΔG_sp/ρ_air, where V_cl is the volume of closed pores in cm³, ΔG_sp is the variation of the weight of the specimen after evacuation in g, ρ_air is the air density in g/cm³, G_sp is the weight of the specimen in air in g, ρ_fr is the density of the material of the frame in g/cm³, V_op is the volume of open pores in cm³, and V is the volume of the specimen in cm³. The device comprises pressure-tight measuring chamber for the specimen to be analyzed. The chamber can be in communication with the atmosphere and is connected with the vacuum pump and receives the pickup of movements and housing of the oil damper. The top end of the pillar is provided with the unit of vertical movements which is provided with top end of the spring through the rigidity controller. The specimen, oil damper, and sensor of the pickup of movements can be secured to the bottom end of the spring.

EFFECT: enhanced accuracy and simplified procedure of measuring.

2 cl, 1 dwg