Stretching-bending combined-load in-situ nano-indentation test device and method

Abstract

The invention relates to a stretching-bending combined-load in-situ nano-indentation test device and a method and belongs to the field of precision scientific instruments and material mechanical testers. The overall structure of the test device is in a crossing distribution form and comprises three parts, namely, a stretching loading module, a bending loading module and an indentation loading module, wherein the stretching loading module is arranged in the middle place; the bending loading module and the indentation loading module are respectively distributed on the two sides of the stretching loading module; each of the stretching loading module, the bending loading module and the indentation loading module comprises a driving component, a transmission component, an executing component and a displacement signal and force signal precise detecting component; the loading force lines of the stretching loading module, the bending loading module and the indentation loading module are in the same plane. The synchronous acquisition for the loading/displacement signals can be realized and the closed-loop control on a servo driving system can be realized. The device is smart in structure, is compatible with a mainstream optical microscope and is capable of realizing the multi-load in-situ test for a macroscopic test piece with the feature size above millimeter level.

Description

technical field [0001] The invention relates to the field of precision scientific instruments and material mechanics testing machines, in particular to an in-situ nano-indentation testing device and method for tensile-bending composite load integrating precision driving and detection. The invention belongs to a small test instrument, which is compatible with microscopic imaging equipment, realizes in-situ observation in the material test process, and provides an effective test method for the macroscopic mechanical performance test of the material and the exploration of the microscopic deformation and damage mechanism. Background technique [0002] Traditional material testing methods mainly include tensile, bending, torsion, shear, impact, fatigue and other testing methods. Using these methods and their corresponding theories, the elastic modulus, strength limit, fatigue limit, hardness and other mechanical parameters of materials can be measured. . With the development of ...

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Problems solved by technology

A.M.Minor and others have pointed out the inadequacy of the off-site test: due to the in-situ monitoring of the specimen by the use of microscopic imaging equipment, it is difficult to study the law between the deformation damage mechanism of the material, the load action and the material performance parameters

The in-situ testing technology based on the principle of micro / nano-electromechanical systems has complex processes and limited application range, and cannot test three-dimensional specimens with macroscopic dimensions (characteristic dimensions above the millimeter level)

[0004] At present, the research on the mechanical performance of materials mostly stays on a single load, and the mechanical performance parameters of materials are all tested under ideal conditions. However, the stress of materials and their products in actual working conditions is more complicated, and The performance of the performance is often different from that of a single load, and the mechanical performance test of a single load cannot accurately evaluate the mechanical properties of a material under a combined load

Wen Shizhu, a professor at Tsinghua University, pointed out that there is currently a lack of in-depth research on the deformation and damage mechanism of materials, which is urgently needed in the design and manufacture of tiny components.

A single load test is obviously unable to study the law between the deformation damage mechanism of the material and various types of loads

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