A scale-adjustable two-way synchronous compression experiment in-situ observation device

Abstract

The invention discloses a ratio adjustable in-situ observation device for a bidirectional synchronization compression experiment. The device comprises a base, a support column, a screw, a loading nut,a press ring, and a wedge block. The screw is fixed above the base through the support column and is composed of an upper threaded part and a lower loading part. The threaded part cooperates with theloading part through threads. The top of the loading part is provided with a groove for placing a sample. An accommodation groove that cooperates with the wedge block is uniformly arranged in the lateral wall of the loading part along the circumferential direction. The upper part of the bottom of the accommodation groove is communicated with the lower part of the lateral wall of the groove. The wedge block is in a big end up shape. The upper part of the vertical surface is provided with an embossment. The embossment penetrates a channel and contacts with the sample. The inclined surface protrudes from the lateral surface of the screw. The lower end face of the press ring abuts on the upper end face of the loading nut. The inner side of the press ring slidingly cooperates with the inclinedsurface of the wedge block. The structure is simple, the loading state during the experiment process can be maintained, and the microscopic tissue change of a sample during the process of a compression test can be in-situ observed.

Description

technical field [0001] The invention relates to the field of material physical property testing, in particular to an in-situ observation device for bidirectional synchronous compression experiments with adjustable ratio. Background technique [0002] The use of high-strength forming materials has increased greatly in recent years, such as sheet metal and forgings. In order to improve the processing and production efficiency of metal materials and save production costs, it is necessary to conduct in-depth and detailed research on the microstructure evolution process of metal materials during the forming process. In the process of drawing, die forging, etc., if one of the three principal stresses is much smaller than the other two principal stresses, the minimum principal stress is approximately zero, and the metal material is often in a state of bidirectional compressive stress, which is different from uniaxial tension. Or the uniaxial stress state during compression, the bia...

AI Technical Summary

Problems solved by technology

At present, there is still a lack of equipment that can study the deformation capacity and deformation behavior of materials under biaxial compression

In addition, only through the comparison of microstructure changes before deformation and after final deformation, omitting the study of the intermediate process is likely to lead to incomplete theoretical results or completely wrong results

At present, there are few in-situ experiments that can study the continuous change process of materials in a specific area during bidirectional compression, and there are even fewer equipments that can perform variable-scale loading in-situ electron microscope observation and tissue orientation determination of the microstructure in the deformed area.

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