Fatigue testing machine and test method for in-situ imaging with synchrotron radiation light source

Abstract

A fatigue testing machine and test method that can perform in-situ imaging with a synchrotron radiation light source. The test machine is composed of: the cross at the bottom of the bottom plate is embedded on the platform of the synchrotron radiation light source, and the servo motor of the bottom plate is connected to the bottom plate through a cam linkage mechanism The lower end of the lower fixture on the base is connected; the upper surface of the cover plate of the base is simultaneously movable and fitted with a semi-circular plexiglass inner cover and a semi-circular plexiglass outer cover, and the tops of the plexiglass inner cover and the plexiglass outer cover are connected to the The top cover is fitted and connected, the middle part of the bottom surface of the top cover is connected to the upper end of the load sensor, and the lower end of the load sensor is connected to the upper fixture; the upper fixture is located directly above the lower fixture; the servo motor and the load sensor are electrically connected to the data processing and control device. During the fatigue test, the testing machine can perform synchrotron radiation imaging on the fatigue sample to obtain a three-dimensional image inside the material; it can more clearly and accurately reflect the mechanical properties of the material and the evolution of the microstructure.

Description

technical field [0001] The invention relates to a fatigue testing machine for in-situ imaging with a synchrotron radiation light source and a testing method thereof. Background technique [0002] For a long time, people have carried out a lot of research on the fatigue damage of engineering structures. It is generally believed that the fatigue life is mainly consumed in the stages of crack initiation and short crack growth. Macroscopically, the propagation behavior of short cracks changes with the increase of crack length, and microscopically, it is also affected by factors such as metal microstructure and environment, coupled with crack closure and small crack effects, etc. The problem of short crack propagation becomes very complicated. In order to better explore the relationship between the crack growth process and microstructure changes and macroscopic mechanical properties, and to provide a more reliable theoretical basis for the life design of engineering parts, it i...

AI Technical Summary

Problems solved by technology

However, SEM can only obtain a two-dimensional image of the surface of the material, but not a three-dimensional image of the interior of the material; and the brightness of the light source is low, and the signal-to-noise ratio of the optical signal detection is low, so that the measurement accuracy and detection sensitivity need to be improved

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