Device and method for measuring ultra-high temperature flexural modulus and fracture strain of materials

Abstract

The invention discloses a device for measuring superhigh temperature flexure elasticity modulus and fracture strain of a material. The device comprises a load transmitting structure, a deformation transmitting structure and a deformation sensor. The problem that in the test environment with the temperature of 1500 DEG or above, temperature of the environment where a traditional deformation sensor is located exceeds service temperature, and measurement cannot be carried out through the traditional deformation sensor is solved. A water cooling protective sleeve is connected to a hot end pressing rod, heat conduction and heat radiation to the deformation sensor by the outside can be effectively blocked, which is beneficial for reducing the temperature of the deformation sensor, the temperature deformation sensor is made to be 50 DEG C or below, and then the deformation sensor can measure flexure elasticity modulus and fracture strain of the material in the superhigh temperature environment.

Description

Technical field [0001] The invention relates to a device and method for measuring the flexural modulus and fracture strain of materials at ultra-high temperature, and belongs to the field of material mechanical performance testing. Background technique [0002] With the rapid development of the field of hypersonic aircraft in the near space, the aircraft operates at hypersonic speed (> 5Ma) When flying in the atmosphere, the hot end parts such as the nose cone and the leading edge of the wing are subjected to severe aerodynamic heating. The temperature of the severe part can reach 1800℃ or more. High requirements are put forward for materials that can be used in this temperature range, which promotes carbon / Development of carbon, ceramic matrix composite materials, ultra-high temperature ceramic materials and refractory metal materials. Therefore, in the design of aircraft and the development of new materials, mechanical performance testing under ultra-high temperature condit...

AI Technical Summary

Problems solved by technology

The main reason is that under ultra-high temperature conditions, many tests above 1500 °C are mostly carried out in vacuum (inert gas) furnaces, without air cooling and other heat dissipation conditions, while extensometers work in vacuum (inert gas) furnaces, and the ultra-high temperature test environment The high temperature brought by radiation and heat conduction exceeds the maximum service temperature of existing strain gauge, inductive, and capacitive extensometers, so it is impossible to measure parameters such as flexural elastic modulus and fracture strain

[0004] Invention patent CN 105092372A discloses "a system and method for real-time monitoring of metal sample strain in high-temperature and high-pressure environments", but the above-mentioned method has the following shortcomings: First, the above-mentioned strain measurement method is suitable for metal tensile tests, but not Bend tests on brittle materials

Second, the above-mentioned strain measurement method leads the deformation of the sample out of the high-temperature furnace. There are many connection parts and the deformation loss is relatively large. For metal samples with large strains, the accuracy can still meet the requirements, but for ultra-high temperature service environments Ceramic-based, carbon / carbon, and ultra-high-temperature ceramic samples have high elastic modulus, low fracture strain, and high requirements for deformation measurement accuracy. The above-mentioned disclosed patents are not suitable for bending strain measurement of materials in ultra-high temperature environments

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