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A high-temperature strain measurement method for eliminating the effect of out-of-plane displacement

A technology of out-of-plane displacement and high-temperature strain, which is applied in the direction of measuring devices, applying stable tension/pressure to test material strength, instruments, etc., can solve the problem that the calibration accuracy has a great influence on the measurement accuracy, the experimental device is complicated, and the operation is very difficult and other problems, to achieve the effect of wide field of view, compact equipment structure and convenient operation

Active Publication Date: 2018-07-20
SOUTHEAST UNIV
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Problems solved by technology

This method needs to calibrate the two cameras in advance, the usual calibration process is cumbersome and the calibration accuracy has a great impact on the measurement accuracy
The experimental device is complicated and expensive, and the operation is also very difficult, which is inconvenient for technicians without professional training

Method used

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  • A high-temperature strain measurement method for eliminating the effect of out-of-plane displacement
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  • A high-temperature strain measurement method for eliminating the effect of out-of-plane displacement

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, the high-temperature strain measurement device for eliminating the influence of out-of-plane displacement in this embodiment includes a high-temperature loading platform, a test piece, two cameras, and a computer containing a calculation program.

[0024] The test piece in this embodiment is made of aluminum alloy, and the camera pixels are 1024*1024. The specimen was fixedly mounted on a high-temperature loading platform, and random speckles were made on the surface of the specimen by using high-temperature-resistant materials. Fix two cameras, the object distance L of camera A 1 is 500 mm, the object distance L of camera B 2 The lens plane of the two cameras should be roughly parallel to the plane of the speckle pattern, and the angle between the lens planes of the two cameras and the plane of the speckle ...

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Abstract

The invention discloses a high-temperature strain measurement method for eliminating off-surface displacement influences. The double-camera measurement method based on two-dimensional digital image correlation is provided to avoid measurement errors caused by off-surface displacement of test pieces when surface strain of the test pieces is measured by a two-dimensional digital image correlation method at a high temperature, and can be used for surface strain measurement of the test pieces in a high-temperature environment. According to the linear relation between virtual strain and object distance due to off-surface displacement, the test pieces are imaged in two cameras with different object distances, so that the off-surface displacement influences are eliminated, and the problems of large errors or hardware structure complexity of conventional measurement methods are solved.

Description

technical field [0001] The invention relates to a high-temperature strain measurement method for eliminating the influence of out-of-plane displacement, and belongs to the field of non-contact high-temperature optical measurement. Background technique [0002] The strain measurement of the specimen is an important content of experimental mechanics. The strain measurement at room temperature is mainly through contact measurement methods such as attaching strain gauges on the surface of the specimen. However, contact measurement methods are no longer practical in high temperature environments, rather than contact measurement. The method can measure the surface strain information of the specimen under the condition far away from the high temperature environment. [0003] The digital image correlation method is a non-contact optical measurement method. By collecting two images of the specimen before and after deformation, the surface strain and displacement information of the sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/06
Inventor 何顶顶郑成林费庆国
Owner SOUTHEAST UNIV
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