Device and method for testing ultrahigh-temperature indentation load-displacement curve

Abstract

The invention discloses a device and a method for testing an ultrahigh-temperature indentation load-displacement curve. A to-be-tested ultrahigh-temperature material test piece is placed on a test piece loading platform in a high temperature furnace; one end of a loading rod is connected with a loading device located outside the high temperature furnace, a press head is arranged at the other end of the loading rod, and the other end of the loading rod stretches into the high temperature furnace and contacts the test piece; an ultrahigh-temperature extensometer for measuring displacement of the loading rod in the furnace is arranged on the high temperature furnace; a precise displacement sensor is used for measuring the displacement of the loading rod outside the high temperature furnace; and the test piece and the press head are heated to an experiment temperature by the high temperature furnace, after the temperature is stable, the test piece is loaded and unloaded by adopting the loading device, meanwhile, the ultrahigh-temperature extensometer close to the test piece and the precise displacement sensor away from the test piece are adopted to measure indentation displacement, and the ultrahigh-temperature extensometer and the precise displacement sensor are cooperated to measure the ultrahigh-temperature indentation load-displacement curve with high precision. According to the device and the method for testing the ultrahigh-temperature indentation load-displacement curve, measuring error of the extensometer caused by reverse motion idle running in the transforming process from loading to unloading is eliminated by two displacement sensors, and the measurement precision is improved.

Description

technical field [0001] The invention relates to an indentation load-displacement curve test system and a test method for ultra-high temperature materials under conditions close to service, in particular to the mechanical performance test of ultra-high temperature coating film materials, and belongs to the technical field of ultra-high temperature mechanical testing. Background technique [0002] When a supersonic vehicle flies in extreme environments such as long-term cruise and atmospheric re-entry, some parts will have serious aerodynamic heating, and even obvious ablation, resulting in damage to the aerodynamic shape, affecting the normal flight of the vehicle, and even have catastrophic consequences. Ultra-high-temperature materials have high strength and good oxidation resistance under high-temperature conditions, which can ensure the normal flight of hypersonic aircraft in extreme environments. In particular, the successful application of ultra-high-temperature coating...

AI Technical Summary

Problems solved by technology

However, the maximum operating temperature (800°C) of the above-mentioned commercial instruments is relatively low, which does not reach the ideal ultra-high temperature range (1600-1800°C)

At the same time, traditional precision displacement sensors cannot work normally under ultra-high temperature conditions. Generally, ultra-high temperature extensometers are used to complete displacement measurement. get a reasonable correction

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