Radial strain measurement device for compression test at high temperature and high pressure

Abstract

The invention discloses a radial strain measurement device for a compression test at high temperature and high pressure. The radial strain measurement device comprises a kettle body and a heating furnace, wherein the kettle body is of a cylindrical hollow tube structure, a heating-section bulge ring is arranged in the middle of the kettle body and located in the center of a hearth of the two-halfopening-closing type heating furnace; a pressure device is arranged at the upper end of the kettle body; a support device is arranged at the lower end of the kettle body; a radial measurement device is arranged in the middle of the kettle body in the horizontal direction; a sample is arranged in the middle of a cavity of the kettle body; a measurement head of the radial measurement device makes contact with the side wall of the sample; a filling hole communicated with the inner cavity of the kettle body is formed in the side wall of the kettle body above the heating-section bulge ring. The radial strain measurement device can adapt to various media and samples, can be used for tests at high temperature and high pressure, meets the requirement for measurement precision, is convenient and reliable to use and low in maintaining cost and has good effect.

Description

technical field [0001] The invention relates to a radial strain measuring device for a compression test, in particular to a radial strain measuring device for a compression test under high temperature and high pressure, and belongs to the technical field of material testing equipment. Background technique [0002] Mechanical parameters such as elastic modulus, yield strength, Poisson's ratio, enduring strength, and ultimate failure strength, as the most basic physical constants of materials, are the basic data of many applied researches and are widely used in all walks of life. With the development of human Exploration space extends to deep space and deep ground, such as deep sea resource mining, deep earth prospecting, and engineering applications are developing to higher temperature and pressure, such as ultra-supercritical units, nuclear reactor pressure vessels, etc., facing more harsh environmental conditions, high temperature and high pressure It is one of them. As a r...

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Problems solved by technology

[0003] (1) The general-purpose triaxial stress testing machine uses silicone oil as the heating medium. Due to the limitation of the ignition point, the heating temperature is ≤400°C, so the operating temperature of the equipment is relatively low;

[0004] (2) The deformation measurement of the general-purpose triaxial stress testing machine mainly includes two methods of installing strain gauges on the sample and attaching strain gauges, which can measure various deformations such as axial and radial directions. The advantages of these two methods are direct measurement and relatively accurate measurement data. , but there are problems such as high sensor installation requirements and troublesome lead wires. The link is cumbersome and the test will fail if you don’t pay attention to it. Oxidative corrosion, in order to avoid sensor damage and short circuit, the device cannot be used in weak corrosive media such as water, and water, low-concentration salt solution, and acid-base solution are the media we often encounter, which greatly limits the use of the device;

[0005] (3) There are relatively many axial strain measurement methods for special pressure testing machines, but in terms of radial strain measurement, there is a lack of good methods under high temperature and high pressure ≥ 400 ° C. In the protective gas medium, optical measurement and other methods can be used. However, the price of the equipment is high and it is not suitable for liquid media, especially when the medium becomes turbid during the test process, the test cannot be carried out at all, and there is no good solution for liquid media.

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