In-situ test device for material structure and performance under the combined driving mode of motor and hydraulic pressure

Abstract

The invention discloses a device for in-situ testing of material structure and performance under the combined driving mode of motor and hydraulic pressure, which belongs to the technical field of in-situ detection of material structure and performance. Base B, specimen chuck, motor drive system and hydraulic drive system, the device has a compact structure, good compatibility with experimental equipment, servo motor and hydraulic dual drive, large tension / compression range, and expands the materials used for experiments The range of strength, the long moving distance of the sample chuck, can realize large deformation, high precision of displacement and force detection, controllable deformation rate, and can realize displacement closed-loop control or force closed-loop control. The device can be used alone or in conjunction with X-ray diffraction equipment, which solves the problem that the previous experiments can only detect the end state, and can observe the material in the transition state of the sample in the process of tension and compression in situ Microstructural changes and material microstructural changes at specific strain points.

Description

technical field [0001] The invention relates to the technical field of in-situ detection of material structure performance, in particular to an in-situ test device for material structure performance under the combined drive mode of motor and hydraulic pressure. The device can be used for in-situ observation of tensile experiments and compression experiments. In-situ observation; it can be used alone or in conjunction with X-ray diffraction equipment to realize in-situ observation of the structure and properties of metal materials under both tension and compression experiments. Background technique [0002] X-ray diffraction analysis (X-ray diffraction, referred to as XRD) is a structural analysis method for the spatial distribution of internal atoms in a substance by using X-ray diffraction formed by crystals. The X-ray diffraction method has the advantages of no damage to the sample, no pollution, fast, high measurement accuracy, and a large amount of information about the ...

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Problems solved by technology

The characteristics of X-ray diffraction analysis make it very suitable for the phase analysis of metal materials under different stress conditions. However, for a long time, the samples of X-ray diffraction experiments are in static state. There are the following problems in the process of phase and structure change of metal materials in metal materials: first, several tensile experiments and X-ray diffraction experiments need to be done separately, the number of experiments is large, the number of samples is large, and the experiment cycle is long; The method of obtaining samples by unloading when the tensile test is at different stages cannot ensure that the internal structure and stress state of the material will not change from a certain loading state to an unloading state

This patent has three deficiencies in the in-situ tissue performance experiment of materials; first, the experimental load is limited, and the maximum can only reach 2KN; second, only one side of the two sample clamps moves when stretching, and the other side remains stationary. The position of the gauge length part of the sample moves during the whole experiment process. The closer to the center of the sample, the greater the moving distance. In order to keep the center of the sample unchanged during the deformation process, the displacement at the bottom has to be increased. Compensation mechanism; this not only cannot ensure the accuracy of the detection point position, but also increases the volume and cost of the device; third, only a single tensile loading can be performed, and other loading conditions cannot be tested

[0004] Due to the continuous improvement of the strength of advanced structural materials, such as ultra-high-strength steel, titanium alloy, superalloy, etc., under the same thickness and width of the sample, a larger load is required, and the load of the existing in-situ loading device is not enough.

At the same time, in order to ensure that the light spot is completely irradiated on the surface of the sample, the wider the sample width, the better, so as to avoid the interference data caused by the light spot irradiating on the surface other than the sample, but the increase of the sample width will also increase the loading force

Based on the above two points, there is an urgent need for in-situ mechanical performance experimental devices with large loads. However, if the load is increased through motor drive, the structural size of the entire device will inevitably be increased, and the structural size of the entire device is limited by the space of supporting experimental equipment. Limitation, if the device is too large, it will interfere

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