A test device and test method for mechanical tensile properties in high temperature environment

Abstract

The invention relates to a mechanical tensile property testing device under a high temperature environment and a testing method. The testing device comprises a tension load applying system, a high temperature atmosphere furnace, a temperature measuring and controlling system for carrying out temperature control on the high temperature atmosphere furnace, a regulating device for regulating the position of the high temperature atmosphere furnace and a high temperature deformation testing system for deformation measurement, wherein the tension load applying system comprises a main body structure,a support platform, a pair of connecting rods, a water-cooled fixture with a water-cooled structure and a pressure sensor; the high temperature atmosphere furnace comprises a first furnace body and asecond furnace body, the inner parts are heating areas, the getting close sides of the first furnace body and the second furnace body are inserted with a longitudinal heat insulation plate, and the first furnace body, the second furnace body and the longitudinal heat insulation plate are mutually cooperated to form a testing area for sample installation. The device and the method disclosed in theinvention break through the restriction of a high temperature chuck, the temperature field is more uniform, the oxidation time can be regulated more accurately, the modulus testing accuracy and the success rate are high, and the testing efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of high-temperature testing of experimental mechanics, and in particular relates to a testing device and a testing method for mechanical tensile properties in a high-temperature environment. Background technique [0002] In view of the fact that advanced high-temperature-resistant ceramic matrix composite materials and components need to withstand harsh service environments, the high-temperature environment coupled with heat / force / oxidation puts forward higher requirements for high-temperature materials; the material research and production department has produced high-temperature materials with different properties for this purpose (carbon / carbon and carbon / silicon carbide composite materials, high-temperature ceramic materials, and materials such as aerogels and adhesives). When designing and analyzing high-temperature components used in extreme environments, it is necessary to understand the basic mechani...

AI Technical Summary

Problems solved by technology

However, in the field of high-temperature mechanical testing, due to the limitation of high-temperature fixtures and deformation sensors, neither the measurement accuracy nor the measurement efficiency can well meet the needs of national defense technology equipment research and production and high-tech. Therefore, the development of mechanical performance testing in high-temperature environments Devices and methods are very necessary, which provide guidance for the optimization design of materials and structures in aerospace and other fields, material process selection, and service reliability. and reliability analysis provides assurance

[0003] The mechanical tensile properties under high-temperature environment are generally tested by using a large-scale high-temperature atmospheric furnace with thermal clamping. Thermal clamping puts forward strict requirements on the material of the clamp, which requires long-term high-temperature resistance, oxidation resistance, high strength and toughness. This kind of material is difficult to find, or the price is expensive; the furnace wall of the high-temperature atmospheric furnace is thick, and a long high-temperature extension rod is required. The long extension rod itself deforms greatly at high temperature, and the knife edge is easy to slip on the surface of the sample, resulting in a successful modulus test. The rate is low, and the data dispersion is large; for each test of hot clamping, the high-temperature furnace needs to be raised to the target temperature first, and then keep warm before testing. After the test, the temperature is lowered, and then the sample can be replaced. Low efficiency; this high-temperature mechanical test method cannot accurately control the oxidation time of the sample, so it cannot meet the needs of some materials that require short-term high-temperature oxidation performance tests

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