Loading method and device for measuring micromechanical property of material under action of stress

Abstract

The invention provides a loading method and device for measuring micromechanical property of a material under the action of stress. The loading device comprises a main loading device body, a force application cutter and a bolt, wherein the main loading device body is provided with a loading screw hole, a force application cutter clamp groove is formed below the loading screw hole, and two side frames consist of support cutters to serve as a support platform; the force application cutter adopts a sharp wedge shape, and a cutter head in the sharp wedge shape is a round angle; and a thread on the bolt is matched with the loading screw hole of the main loading device body, and a straight groove is formed in the top of a nut, so that the nut is screwed into the loading screw hole and applies positive pressure on the force application cutter. According to the loading device and method, a NanoIndenter (MTS, USA) can be applied conveniently, easily and directly without transformation or processing, so that the loading method is further simplified, and a theoretical calculating value and a true value of the material stress coincide better.

Description

technical field [0001] The invention relates to a technique for measuring mechanical properties of materials, in particular to a loading device and a method suitable for a nano-indentation instrument, which are used to measure the mechanical properties of materials at the nanometer scale under stress. Background technique [0002] Nano-indentation technology, also known as depth-sensitive indentation technology, is one of the methods to test the mechanical properties of materials. It can measure various mechanical properties of materials on the nanometer scale, such as: load-displacement curve, elastic modulus, hardness, fracture Toughness, strain hardening effects, viscoelasticity or creep behavior, etc. (A.C. Fischer-Cripps, Nanoindentation, seconded., Springer, New York, 2004). The emergence and application of nano-indentation instrument makes nano-indentation technology widely used. From the search results in the WebofknowledgeSM database, it can be seen that reports on...

AI Technical Summary

Problems solved by technology

However, at present, few people study the micro-mechanical properties of materials under stress, which is mainly limited by the requirements of the special stage of the nanoindenter on the sample, and it is difficult to realize the loading of the sample.

[0003] The traditional loading device generally uses a dial gauge to measure the disturbance and then load quantitatively. The size design of the loading device is too large, which is not suitable for use on the NanoIndenter (MTS, USA) nanoindenter

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