High-temperature superplastic tension large deformation measurement device and method

A measuring device and superplastic technology, applied in the field of instruments, can solve the problems of large deformation error, inability to judge and record the generation and development of necking, etc.

Inactive Publication Date: 2016-11-16
JILIN UNIV
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Problems solved by technology

[0003] The present invention aims at the problems in the prior art of measuring the deformation of superplastic tensile specimens under high temperature conditions with relatively large errors and the inability to judge and record the occurrence and development of necking. The present invention provides a high-temperature superplastic tensile large deformation Measuring device and method

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  • High-temperature superplastic tension large deformation measurement device and method
  • High-temperature superplastic tension large deformation measurement device and method
  • High-temperature superplastic tension large deformation measurement device and method

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Embodiment 1

[0077]As shown in Figure 1(a) and Figure 1(b), the high-temperature superplastic tensile large deformation measurement device mainly includes a high-temperature furnace tensile mechanism and a deformation measurement mechanism. The high-temperature furnace tensile mechanism and the deformation measurement mechanism are both vertical Place on the ground.

[0078] The tensile mechanism of the high temperature furnace mainly includes: the lower beam 11 of the testing machine, the movable beam 9, the high temperature furnace 10 and the observation window. The high temperature furnace 10 is a closed furnace body, the lower beam 11 and the movable beam 9 are fixed with tie rods, and the observation window is opened on the side of the high temperature furnace 10 facing the deformation measurement mechanism; the lower beam 11 is fixed horizontally, and the movable beam 9 is controlled by the testing machine. The motor drive can drive the pull rod to reciprocate in the high temperature...

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Abstract

The invention provides a high-temperature superplastic tension large deformation measurement device and method and belongs to the technical field of instruments. Aiming at the problems in the prior art that errors of measuring deformation amount of superplastic tension test samples under a high-temperature condition are relatively large, the generation and development of necking cannot be judged and recorded and the like; the device comprises a high-temperature furnace tension mechanism and a deformation amount measurement mechanism; in a measurement process, a tension deformation process is recorded by two sets of cameras fixed on an adjustable tripod head; after calibration through steps including standard test sample calibration and the like, the sizes of transverse and longitudinal deformation of the tension test sample can be obtained through measuring the changes of image length and the errors can also be corrected to obtain a result which is closest to a real condition; the problems of the generation and development of necking and the like can be recorded through the device.

Description

technical field [0001] The invention belongs to the technical field of instruments. Background technique [0002] The superplastic tensile test has always been an important basis for superplastic research. It is the most common and simplest experimental method for studying material superplasticity, measuring material parameters and performance indicators, and is also a method for further revealing the nature and law of superplastic deformation. An important method and approach of superplastic microscopic deformation mechanism and macroscopic deformation law. In the superplastic tensile test, since the sample is stretched in a high-temperature furnace, the extensometer cannot be used to measure its elongation ΔL. Generally, the displacement of the movable beam is used as ΔL, and the stress and strain are calculated based on this And mechanical parameters such as strain rate, which can basically meet the accuracy requirements in the uniform deformation stage. However, when t...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N3/06
CPCG01N3/068G01N3/18G01N2203/0017G01N2203/0226G01N2203/0647
Inventor 马品奎姜振涛
Owner JILIN UNIV
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