High-temperature extensometer and extensometer anti-slip device in high-temperature quasi-static loading test

Abstract

The invention provides an extensometer anti-slip device in a high-temperature quasi-static loading test. The device comprises a clamping piece, one end of the clamping piece is provided with a U-shaped clamping groove, and the other end of the clamping piece is provided with a balancing weight; three inner side edges of the U-shaped clamping groove are provided with knife edges; the balancing weight is arranged to enable a gravity center of the clamping piece in a horizontal placement state to be a certain distance away from a symmetric center line of the U-shaped clamping groove in a horizontal direction; and the clamping piece is provided with a connecting device on the back surface of the rear inner side edge of the bottom side of the U-shaped clamping groove, and the connecting deviceis used for being inserted, contacted and matched with the front end of a ceramic extension rod of the high-temperature extensometer to be fixed and limited. The invention also provides the high-temperature extensometer comprising the anti-slip device. By adopting the anti-slip device, a slip risk between the ceramic extension rod of the high-temperature extensometer and the material surface of the tested test piece can be reduced.

Description

technical field [0001] The invention relates to a high-temperature extensometer, in particular to an anti-slip device for an extensometer in a high-temperature quasi-static loading test. Background technique [0002] With the continuous increase in the design and use temperature of new high-temperature structural materials, it is necessary to use high-temperature extensometers to measure the quasi-static load deformation data of materials at high ambient temperatures. For example, the test temperature of high-temperature mechanical properties of ceramic matrix composites, which have broad application prospects in the aerospace field, is usually 1200°C or even higher. The currently used contact high temperature extensometer is usually installed with a ceramic extension rod on each of the two measuring arms. The measurement and transmission of the load deformation of the material in the distance section, in which the ceramic extension rod is usually made of ceramic material. ...

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Problems solved by technology

[0003] However, the inventors found that due to the small contact area and friction between the front end of the high-temperature ceramic extension rod and the material surface, relative slippage is likely to occur during the test process, resulting in failure of deformation measurement, thereby reducing the success rate of the test and increasing the cost of the test

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