An experimental device and method for measuring Poisson's ratio of materials at high temperatures

Abstract

The invention discloses an experimental apparatus and method for measuring a poisson ratio of a material under high temperature, belonging to the technical field of experimental mechanics and high-temperature tests. The experimental apparatus and method adopts a method combining high-temperature electronic speckling and four-point phase bending to measure the poisson ratio of the material under the high temperature, and is in particular applicable to measuring the poisson ratio of the material under the ultra-temperature (more than 1600 DEG C). The experimental method comprises the steps of: recording interference speckle fields generated by object light and reference light by adopting non-contact measurement and a CCD (Charge Coupled Device) after a four-point bent sample is irradiated by laser, and measuring the off-plane displacement before and after the four-point bending of the sample by adopting an electronic speckling technology, thus directly obtaining the poisson ratio of the material under the high temperature according to a bar chart of the off-plane displacement, so that a problem that the poisson ratio of the material under the high temperature is difficultly measured can be solved.

Description

technical field [0001] The invention relates to a device and method for measuring the Poisson's ratio of a material at a high temperature by combining high-temperature electronic speckle and four-point bending, and is especially suitable for measuring the Poisson's ratio of a material at an ultra-high temperature (above 1600 degrees), belonging to experimental mechanics, high temperature Test technology field. Background technique [0002] At present, the determination of the Poisson's ratio of a material at high temperature is mainly through a high-temperature tensile test. The sample is stretched at a high temperature, and the strain in the tensile direction and the transverse direction is measured by a high-temperature strain gauge to obtain the Poisson's ratio. However, this method requires expensive high-temperature strain gauges for each measurement, and the process is relatively cumbersome, and the current high-temperature strain gauges are only suitable for temperatu...

AI Technical Summary

Problems solved by technology

However, this method requires expensive high-temperature strain gauges for each measurement, and the process is relatively cumbersome, and the current high-temperature strain gauges are only suitable for temperatures below 1100 degrees, so it is urgent to develop new detection devices and methods for Poisson's ratio of materials at ultra-high temperatures , can measure ultra-high temperature Poisson's ratio more conveniently, and increase the measurement temperature to above 1600 degrees

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