High temperature strain foil performance parameter tester and test method thereof

Abstract

The invention provides a high temperature strain foil performance parameter tester and a test method thereof. The high temperature strain foil performance parameter tester is composed of a heating system, a heat preservation system, a temperature control system, a circulation system, a support system and a loading system. The tester and the test method of the invention can test technical parameters of the high temperature strain foil such as null shift, thermal output, thermal delay, mechanical delay, change of sensitivity coefficient with temperature, creep deformation of the high temperature strain foil, creep deformation of constant strength calibration beams made of measured target material and the like. The tester and the test method of the invention feature high test precision, good high temperature repeatability and reliable test results, thus providing data correction for long-term high temperature strain monitoring.

Description

technical field [0001] The invention belongs to a measuring device, in particular to a measuring device for performance parameters of a high temperature strain gauge. Background technique [0002] In the debugging of nuclear reactor system, in order to monitor the long-term high-temperature stress of the equipment, high-temperature strain measurement is an essential and important work for system debugging. At present, the types of commonly used strain gauge calibration devices are concentrated in the national standard "GB-T 13992-1992 Resistance Strain Gauge", which is mainly used for parameter calibration of strain gauges at room temperature and low to medium temperature, and is not suitable for parameter calibration of high temperature strain gauges , its performance and accuracy cannot be guaranteed at high temperatures. Various commonly used strain gauge calibration devices have only one of two loading methods: force loading or displacement loading. The measurement of ...

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Problems solved by technology

The measurement of the displacement value during displacement loading adopts a dial gauge or a three-point deflection meter. This displacement measurement method is inconvenient to implement at high temperature and the measurement accuracy is poor; cycle, and at the same time measure the change of its relevant characteristic parameters, and test the heat output and thermal hysteresis parameters of the high-temperature strain gauge. The premise is to install the strain gauge on the corresponding material test piece. ) on the same material as the tested structure, in a certain temperature cycle, measure the output value of the strain gauge, but once the strain gauge is installed on the test piece, it cannot be removed and reused, which makes the strain gauge It becomes a waste product and cannot be reused. Therefore, a batch of strain gauges can only be calibrated by sampling, which is costly and poorly represented. Especially in the case of a large degree of dispersion, the error is greater; Stabilization and slice-by-slice corrections

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