High-temperature axial compression testing device and testing method

Abstract

The invention discloses a high-temperature axial compression testing device and a testing method. The high-temperature axial compression testing device comprises a pressure container, wherein two axial pressing rods, which are symmetrically sealed, are arranged in the pressure container in the horizontal direction; a test sample is arranged between the two pressing rods; the outer end of one pressing rod is connected with a loading device and a displacement detection device is distributed at the outer end; the outer end of the other pressing rod is connected with a pressure sensor; the loading device, the displacement detection device and the pressure sensor are fixedly connected onto a base; a heating device for heating the test sample sleeves the outer side of the pressure container; the heating device is arranged in a groove of the base; and a temperature sensor is arranged on a contact surface between the heating device and the pressure container. The test sample is subjected to stress strain under axial pressurizing and high-temperature conditions; the stress strain of a solid sample can be measured in situ at a high temperature; surface microscopic appearance characteristics of the solid sample can be observed in situ and microscopic light spectrum measurement can be carried out to obtain a relation between a Raman light spectrum on the surface of the test sample and the stress strain; measured data is closer to actual data; and the measured data is more accurate and reliable and the accurate practice, utilization and analysis of the test sample can be more easily guided.

Description

technical field [0001] The invention relates to a high-temperature axial compression test device and a test method, belonging to the technical field of high-temperature material mechanics test equipment. Background technique [0002] As technology continues to develop, some workpieces are required to be able to operate for longer periods of time under higher operating temperatures and stress conditions. For example, in high-pressure steam boilers, steam turbines, gas turbines, diesel engines, aero engines and chemical oil refining equipment, many parts have been in service under high temperature conditions for a long time. In engineering applications, metal materials are often in an environment under the coupling effect of high temperature and high strain rate, and the dependence relationship between material properties and strain rate is affected by the temperature of the environment in which the material is used. In recent years, research on the high-temperature mechanica...

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Problems solved by technology

[0007] (3) Reduced plasticity

[0011] (1) It is impossible to separately load axial loads on solid samples under high temperature conditions and measure the stress and strain of solid samples in situ; (2) The existing mechanical testing machines are large in size and difficult to connect with microscopes and various spectrometers. It is impossible to observe the surface morphology and microspectral characteristics of solid samples in situ; (3) Most of the existing strain measurement methods use strain gauges, but the price of strain gauges that can be used under high temperature conditions is relatively high, and high temperature conditions The temperature compensation of the lower strain gauge is more difficult to handle

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