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Super hard material nanometer hardness measuring method considering press head elastic deformation

A technology of elastic deformation and nano-hardness, which is applied in the direction of testing material hardness, etc., can solve the problem of not considering the hardness measurement error of the indenter, and achieve the effect of accurate hardness and simple data processing

Inactive Publication Date: 2019-01-01
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the existing method does not take into account the elastic deformation of the indenter to cause a certain error in the hardness measurement, and to provide a method for measuring the nanohardness of superhard materials that considers the elastic deformation of the indenter

Method used

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  • Super hard material nanometer hardness measuring method considering press head elastic deformation
  • Super hard material nanometer hardness measuring method considering press head elastic deformation
  • Super hard material nanometer hardness measuring method considering press head elastic deformation

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specific Embodiment approach 1

[0020] Specific implementation mode 1: This implementation mode records a method for measuring the nanohardness of superhard materials considering the elastic deformation of the indenter, and the steps of the method are as follows:

[0021] Step 1: Based on Hertz’s elastic contact theory, establish a model of elastic contact between two objects, and derive the calculation formula of hardness according to this model. Specifically, formulas 1-7 are two rigid body contacts, which can be used for calculation regardless of elastic deformation; Compared with the existing technology, this model no longer regards the indenter as a rigid body with a fixed geometry, but considers the elastic deformation of the indenter;

[0022] Step 2: Adopt nano-indentation test, load standard fused silica samples at different nano-indentation depths with the indenter, and calibrate the area function of the indenter according to the loading and unloading data of the fused silica samples; compared with ...

specific Embodiment approach 2

[0025] Embodiment 2: A method for measuring the nanohardness of superhard materials when considering the elastic deformation of the indenter described in Embodiment 1. In step 1, the formula for calculating the hardness is as follows:

[0026]

[0027] In the formula, P max is the maximum load, and A is the contact projected area.

specific Embodiment approach 3

[0028] Specific embodiment three: a method for measuring the nanohardness of superhard materials when considering the elastic deformation of the indenter described in the second specific embodiment, the functional expression of the contact projected area A described is as follows:

[0029] A=πRh

[0030] In the formula, R is the radius of the blunt circle at the tip of the indenter, and h is the indentation depth recorded by the nanoindenter.

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Abstract

The invention relates to a super hard material nanometer hardness measuring method considering press head elastic deformation, and belongs to the technical field of nanometer hardness measurement. Themethod comprises the following steps of 1, building two object elastic contact models on the basis of a Hertz elastic contact theory; deducing a hardness calculation formula according to the model; 2, loading a standard molten quartz sample by a press head at different press depths; correcting the area function of the press head according to loading and unloading data of the molten quartz samples; 3, calculating the data of tested samples obtained through nanometer press mark experiments by using the area function obtained in the step 2; obtaining the hardness of the sample to be tested. Thebuilt super hard material nanometer hardness measuring method considering press head elastic deformation has the advantages that the elastic deformation of the press head is considered by the built hardness calculation formula; the hardness of the tested material can be more accurately evaluated. The area function is the linear relationship between the contact area and the maximum press depth; thedata processing is simpler.

Description

technical field [0001] The invention belongs to the technical field of nano-hardness measurement, and in particular relates to a method for measuring the nano-hardness of superhard materials considering the elastic deformation of an indenter, which is applied to the detection of nanoscale mechanical properties on the surface of materials. Background technique [0002] Nanoindentation technology refers to the use of an indenter with a standard geometric shape to load the tested sample, and the force and displacement of the load are recorded through the force and displacement sensors, so as to obtain many mechanical performance indicators such as the hardness and Young's modulus of the material. Due to the use of nano-indentation technology, the mechanical properties of materials can be obtained directly from the load-displacement curve without measuring the area of ​​the indentation. Therefore, as long as the accuracy of the instrument is high enough to measure at the nanosca...

Claims

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Application Information

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IPC IPC(8): G01N3/42
CPCG01N3/42
Inventor 宗文俊钟锋辉孙涛
Owner HARBIN INST OF TECH
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