Buoyancy loss test device and method for buoyancy material under high hydrostatic pressure

Abstract

The invention discloses a buoyancy loss test device and a method for buoyant material under high hydrostatic pressure. The test device comprises a pressure cylinder and a strain gauge. The pressure cylinder is a large general pressure cylinder, the lower end of which is provided with a cylinder bottom and the upper end of which is provided with a cylinder cover. A lath beam which is arranged in the pressure cylinder is suspended under the cylinder cover. A cable hole is arranged on the cylinder cover. An electric cable is arranged in the cable hole. The cable hole and the electric cable are matched in water tight. The upper and the lower surfaces of the middle of the lath beam are all provided with strain foils. The two ends of the electric cable are respectively connected with the strainfoil on the lath beam and the strain instrument. A buoyancy material specimen and a ballast block are arranged under the lath beam. The buoyancy material specimen is suspended on the strain foil under the lath beam. The ballast block is suspended under the buoyancy material specimen. The buoyancy loss value of the buoyant material is obtained through the steps of lath beam selection, lath beam calibration, strain value measurement, stress value conversion, buoyancy loss determination, etc. With the device and the method adopted for the buoyancy loss measurement, the experimental cost can be lowered and the test precision can be improved.

Description

technical field [0001] The invention relates to a testing device and method. Specifically, it is a device and method for measuring buoyancy loss of buoyant materials under high hydrostatic pressure conditions. Background technique [0002] It is well known in the shipbuilding industry that the buoyancy loss of buoyancy materials under high hydrostatic pressure conditions is caused by two factors: water absorption and volume shrinkage of buoyancy materials. Among them, the buoyancy loss caused by the water absorption rate of the buoyancy material can be calculated according to the following water absorption rate formula: [0003] The loss of buoyancy caused by volumetric shrinkage requires special tests to be determined. For example, Emerson & Cuming Company of the United States first uses a small special pressure cylinder to measure the volume shrinkage of the buoyancy material sample, and then calculates the buoyancy loss caused by the volume shrinkage of the buoyancy m...

AI Technical Summary

Problems solved by technology

Although this method can be used to calculate the buoyancy loss caused by the volume shrinkage of the buoyancy material, it has the following disadvantages: First, a special small pressure cylinder is required to test the volume shrinkage of the buoyancy material sample, and then calculate the buoyancy of the buoyancy material Second, in the buoyancy material water absorption formula, the final mass is that the buoyancy material has passed the pressure test, taken out from the pressure cylinder, placed in the air, and weighed

In this way, because the buoyant material loses the effect of high hydrostatic pressure in the air, some water will inevitably escape and evaporate from the buoyant material, making the measured value of the water absorption rate of the buoyant material smaller, which in turn affects the buoyancy of the buoyant material loss of test precision

Therefore, the test accuracy is not high

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