Fatigue testing machine and testing method capable of synchronously radiating light source for in-site imaging

Abstract

The invention provides a fatigue testing machine and testing method capable of synchronously radiating a light source for in-site imaging. According to the composition of the testing machine, a cross at the bottom of a bottom plate is embedded to a synchronous light source radiation platform; a servo motor of the bottom plate is connected with the lower end of a lower clamp on a base of the bottom plate through a cam link mechanism; a semi-annular organic glass inner cover and a semi-annular organic glass outer cover are movably embedded to the upper surface of a cover plate of the base, the organic glass inner cover and the top of the organic glass outer cover are connected with a top cover in an embedded mode, the middle of the bottom face of the top cover is connected with the upper end of a load sensor, and the lower end of the load sensor is connected with an upper clamp; the upper clamp is located over the lower clamp; the servo motor and the load sensor are both electrically connected with a data processing and control device. In the fatigue testing process of the testing machine, synchronous radiation imaging can be performed on fatigue testing samples, and a three-dimensional image in a material is obtained; the mechanical properties of materials and the evolution rule of a microscopic structure can be more clearly and accurately reflected.

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

Images