In-situ indentation mechanical testing device based on tensile compression and fatigue combined load mode

Abstract

The invention relates to an in-situ indentation mechanical testing device based on tensile compression and fatigue combined load mode, and belongs to the field of precise testing instruments. The device is mainly composed of a precise driving unit, a tensile compression and fatigue combined load unit, an indentation load unit, a precise sensing and detecting unit, wherein the precise driving unit can realize quasi-static load; the tensile compression and fatigue combined load unit enables the center of a testing piece to be kept unchanged basically; with combination of a high-resolution imaging system, observation of in-situ mechanical performances of a material can be carried out. A fatigue module is loaded on a tensile compression module, so that fatigue performance of the material can be tested by adopting the precise piezoelectric driving technology. The indentation load unit is arranged right above the testing piece and is pressed in the testing piece vertically, a lead screw stepping motor drives an indentation flexible hinge to feed linearly, and an indentation piezoelectric stack pressed in the testing piece drives precise indentation, so that cross-scale in-situ indentation mechanical test can be carried out. The device has the advantages of compact structure, small size, rapid response, high precision, low cost and the like.

Description

technical field [0001] The invention relates to the field of in-situ nanomechanical performance testing, in particular to the field of precision testing instruments, especially to an in-situ indentation mechanical testing device based on tension-compression and fatigue composite load modes, which can be used in different tension / compression and fatigue composite load modes. In-situ indentation tests of material samples under load prestressing. Background technique [0002] In-situ nanomechanical testing technology refers to testing the mechanical properties of materials at the nanometer scale, and using electron microscopes, atomic force microscopes, optical microscopes and other imaging instruments to analyze the response microscopic deformation, damage and even failure of materials under load. A mechanical testing technique for dynamic monitoring throughout the entire process. In the field of in-situ nanomechanical performance testing, parameters such as hardness, ela...

AI Technical Summary

Problems solved by technology

[0003] At present, the development of related instruments for in-situ nanomechanical testing technology is still immature and still in its infancy. The specific performance is as follows: 1. The existing in-situ nanomechanical testing equipment has a single load and cannot correlate materials under composite loads. Mechanical performance test, so that it cannot simulate the actual condition of the workpiece in the real service state

2. The existing in-situ indentation material testing machine only conducts indentation tests under the free stress state of the workpiece, but rarely involves the phenomenon of the workpiece under the residual prestress

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