An experimental method for studying the microscopic mechanism of material damage based on in-situ analysis technology

Abstract

An experimental method for studying material damage micromechanism based on in-situ analysis includes an experimental method of 2D in-situ analysis and an experimental method of 3D in-situ analysis and includes the specific steps as follows: the experimental method of 2D in-situ analysis includes: preparing a sample, a plane sample, determining an in-situ observation area, and predicting a surface cracking area or presetting an artificial gap; performing in-situ online testing; analyzing damage micromechanism; the experimental method of 3D in-situ analysis includes: preparing a sample and selecting a 3D sample identical to the 2D sample in material; determining an in-situ observation area, predicting a cracking part in connection with the distribution of microscopic composition of internal defects and the like, and using as a subsequent in-situ observation area; performing in-situ online testing; analyzing damage micromechanism. The 3D in-situ analyze enables observation and measurement for damage evolution in three-dimensional space, the 2D in-situ analysis has higher resolution and enables real-time imaging observation, and the two experimental means may be combined to complement each other's advantages.

Description

technical field [0001] The invention belongs to the field of experimental solid mechanics, and in particular relates to an experimental method for studying the microscopic mechanism of material damage, which adopts 2D and 3D in-situ analysis techniques. Background technique [0002] The microscopic mechanism of material damage provides an important basis for the optimal design of material structure, the strength prediction and life prediction of materials and structures, so it is of great significance to reveal the microscopic mechanism of material damage. The traditional experimental research methods on the microscopic mechanism of material damage generally adopt the experimental method of post-analysis or in-situ surface observation based on scanning electron microscopy. Although the post-analysis method can determine the initiation position of the crack on the fracture surface, it cannot reproduce the damage evolution process; although the surface in-situ observation test...

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Problems solved by technology

Although the post-analysis method can determine the initiation position of the crack on the fracture surface, it cannot reproduce the damage evolution process; although the surface in-situ observation test based on the scanning electron microscope can observe the dynamic evolution process of the crack on the surface, it can only The cracks on the surface are observed, and the relationship between the crack evolution and the mechanical field cannot be given, and the microscopic mechanism of damage cannot be revealed in depth

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