Method for correct measurement of hyperthermia stress-strain

Abstract

The invention provides a method which can accurately measure high temperature stress-strain, steps of the method are that: (1) the heat output of high temperature strain foils is calibrated; (2) the high temperature strain foils are spot welded on the surface of high temperature components; (3) the strain foils are heated to the rated temperature and the strain value outputted of each strain foilevery twenty centidegrees are taken down; (4) the strain datum at different temperatures of each point are modified; (5) stress is calculated. The technical effect of the invention is that the invention is suitable for measuring components at the scene at high temperature conditions, particularly the components and parts of the high temperature and high pressure steam pipeline, the steam turbine engine and the jetting engine in power plants working at high temperature static dynamic loading, which can not only measure the high temperature strain of the materials at the scene, but also can accurately distinguish the mechanical strain from the thermal output value according to the measured strain.

Description

technical field The invention relates to a method capable of accurately measuring high temperature stress and strain. Background technique At present, the performance measurement of metal materials at high temperature is mostly processed into standard samples according to certain specifications, and their performance is tested in the high-temperature furnace in the laboratory. However, these technical instruments can be used for basic research in the laboratory, and cannot be measured in the field of industry and aviation to solve the assembly stress generated by components under high temperature work. Resistance strain gauges are used for strain measurement at high temperatures. High temperature resistance strain gauges are made of special wire materials. As the temperature rises, the resistance value of the strain gauges will also increase or decrease. This is the heat output. Each high temperature The heat output of the strain gauges is all incons...

AI Technical Summary

Problems solved by technology

However, when the manufacturer produces high-temperature strain gauges, only the resistance value and sensitivity coefficient are marked, and the heat output value is not marked, so the measurement error is large.

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