Device and method for preparing curvature method residual stress test specimen

Abstract

The present invention relates to the field of mechanical processing and manufacturing, and more particularly relates to a device and a method for preparing a curvature method residual stress test specimen. The device includes an upper clamp plate, a lower clamp plate, and a coating specimen plate. The coating specimen plate comprises a first specimen plate and a second specimen plate. The first specimen plate and the second specimen plate are interspersed with each other, an opening is formed in the middle of the upper clamp plate, and the upper clamp plate and the lower clamp plate press thecoating specimen plate. Through a single process, a plurality of test specimens can be obtained simultaneously. The fixture is simple in operation, strong in practicability, low in cost and high in efficiency, and can be used to prepare a variety of different coating residual stress specimens.

Description

technical field [0001] The invention relates to the field of mechanical processing and manufacturing, more specifically, to a device and method for preparing a curvature method residual stress test sample. Background technique [0002] Nowadays, there are still some problems in the research work of coating residual stress testing. For example, when performing residual stress testing on materials with similar structures, materials, and geometric dimensions, the results of each measurement are often different, or even have large deviations, resulting in There are large errors in the measurement results, which is not conducive to the optimization of coating design and strength calculation, and also hinders the promotion and application of coating technology. In addition, the thickness of the coating will have a greater impact on the measurement of residual stress. Improper fixture design can hardly ensure that the samples prepared under the same process conditions have the same...

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Problems solved by technology

[0003] Excessive residual stress in the coating / substrate system often leads to problems such as easy peeling and cracking of the coating, and cannot effectively protect the substrate material under the coating, so residual stress measurement in the coating / substrate system is very important of

However, because coatings are often thin, especially some hard coatings, which are usually only a few microns or nanoscale in thickness, it is often difficult to test the residual stress of these small-scale coatings, and the sample preparation for testing the residual stress is often It is also more difficult, which makes the residual stress measurement of the coating / substrate system has been plagued by academic circles, limiting the wider use of coatings

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