CN109060528A - A method of evaluation metal material spherical shape indentation load-displacement curve validity - Google Patents
A method of evaluation metal material spherical shape indentation load-displacement curve validity Download PDFInfo
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- CN109060528A CN109060528A CN201810796707.6A CN201810796707A CN109060528A CN 109060528 A CN109060528 A CN 109060528A CN 201810796707 A CN201810796707 A CN 201810796707A CN 109060528 A CN109060528 A CN 109060528A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention discloses a kind of evaluation metal material spherical shape indentation load-displacement curve validity methods, belong to material analysis the field of test technology.This method passes through the load-displacement curves during instrumentation indentation equipment acquisition spherical indentation first, and the validity of load displacement curve is then evaluated according to the contact stiffness of unloading curve.Spherical indentation load-displacement curves validity assessment method proposed by the present invention, the impression mechanical property for research material.The assessment method is simple, intuitive, and the accuracy of impression mechanical experimental results can be improved, be of great significance to the functionization of spherical indentation mechanic property test method.
Description
Technical field
The invention belongs to material analysis the field of test technology, and in particular to a kind of evaluation metal material spherical shape indentation load-
The method of displacement curve validity.
Background technique
Indentation method is a kind of method of simple and easy test material mechanical property, since impression size can be as small as micron
Or nanoscale, mechanics properties testing of the indentation method particularly suitable for small-size materials and in-service equipment.According in Indentation Process
The mechanical property that load-displacement curves calculate material is to study a kind of more method at present.It is bent to obtain correct load-displacement
Line is the accurate premise for calculating metal material impression mechanical property.However, the influence of test sample preparation, exists in experiment
The less reproducible phenomenon of the indentation curve of product, affects the accuracy of test result.
The research about indentation method ergometry Performance Influence Factor is concentrated mainly on measuring instrument, specimen surface shape at present
State, material properties, measurement environment, parameter setting etc., it is less to the research of same sample indentation curve repeatability.GB/T
The A class that 21838.1-2008 (the instrumentation indentation test part 1 of metal material hardness and material parameter: test method) is provided
Uncertainty include the determination of zero point, the measured value of power and displacement, the removal test approximating method of force curve, drift rate and
The variation of the contact area due to caused by surface roughness.The standard is proposed using multiple indentation test evaluation experimental result not
Deterministic method, but there may be invalid experimental result in many experiments, calculating knot will be improved by removing invalid result
The accuracy of fruit.Therefore, it is necessary to propose a kind of evaluation metal material spherical shape indentation load-displacement curve validity method,
Keep impression mechanical experimental results more accurate.
Summary of the invention
The purpose of the present invention is to provide a kind of evaluation metal material spherical shape indentation load-displacement curve validity sides
Method, the assessment method is simple, intuitive, the accuracy of impression mechanical experimental results can be improved, to spherical indentation mechanical property
The functionization of energy test method is of great significance.
To achieve the above object, the technical solution adopted in the present invention is as follows:
A method of evaluation metal material spherical shape indentation load-displacement curve validity, this method comprises the following steps:
1) spherical micro-indentation test is carried out repeatedly to metal material to be measured, obtains a plurality of complete load-displacement curves；
2) validity of spherical indentation load-displacement curves is evaluated according to the contact stiffness of unloading curve.
Above-mentioned steps 1) described in micro-indentation test use spherical indenter, metal material surface obtain spherical indentation.
Above-mentioned steps 1) described in complete load displacement curve include loading curve and unloading curve.
Above-mentioned steps 2) described according to the contact stiffness of unloading curve evaluate spherical indentation load-displacement curves validity
Standard are as follows: the maximum load displacement curve of contact stiffness be efficiency curve.
Above-mentioned steps 2) described according to the contact stiffness of unloading curve evaluate spherical indentation load-displacement curves validity
Principle are as follows: same sample different location be pressed into when, since there are flatness errors between actual samples and experiment porch, cause
The contact stiffness of unloading curve reduces.
The advantages of the present invention are as follows:
Evaluation metal material spherical shape indentation load-displacement curve validity method proposed by the present invention is simple, intuitive, can
To improve the accuracy of impression mechanical experimental results, have to the functionization of spherical indentation mechanic property test method important
Meaning.
Detailed description of the invention
Fig. 1 is indentation equipment schematic diagram.
Fig. 2 is effective and invalid load-displacement curves schematic diagram of same sample difference pushed position.
Fig. 3 is the spherical indentation load-displacement curves test result of embodiment 1.
Fig. 4 is the spherical indentation load-displacement curves test result of embodiment 2.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and embodiments.
The present invention be a kind of evaluation metal material spherical shape indentation load-displacement curve validity method, specifically include as
Lower step:
1) spherical micro-indentation test is carried out repeatedly to metal material to be measured with indentation equipment shown in FIG. 1, obtained a plurality of complete
Load-displacement curves；
2) validity of spherical indentation load-displacement curves is evaluated according to the contact stiffness of unloading curve: contact stiffness is most
Big load-displacement curves are efficiency curve, as shown in Figure 2.
Embodiment 1
In the present embodiment, 304 stainless-steel sheets is selected to carry out spherical indentation Mechanics Performance Testing.Detailed process is as follows:
1) diameter is used to carry out multiple impression mechanical property on the spherical indenter of 0.5mm indentation equipment shown in Fig. 1
Test, loads typical-displacement curve of acquisition are as shown in Figure 3.
2) judge the validity of load displacement curve: the unloading curve contact stiffness of curve 3 is smaller in Fig. 3, therefore is nothing
Imitate curve.The contact stiffness of curve 1 and curve 2 is maximum in Fig. 3, is efficiency curve.
It is respectively 696MPa, 680MPa and 580MPa with the tensile strength that curve 1, curve 2 and curve 3 are calculated, uses
The tensile strength that stretching experiment obtains is 684MPa.As it can be seen that using the method for the present invention obtain efficiency curve test result more
With accuracy.
Embodiment 2
In the present embodiment, galvanized steel plain sheet is selected to carry out spherical indentation Mechanics Performance Testing.Detailed process is as follows:
1) diameter is used to carry out multiple impression mechanical property on the spherical indenter of 0.5mm indentation equipment shown in Fig. 1
Test, loads typical-displacement curve of acquisition are as shown in Figure 4.
2) judge the validity of load displacement curve: the unloading curve contact stiffness of curve 3 is smaller in Fig. 4, therefore is nothing
Imitate curve.The contact stiffness of curve 1 and curve 2 is maximum in Fig. 4, is efficiency curve.It is calculated with curve 1, curve 2 and curve 3
To tensile strength be respectively 285MPa, 283MPa and 221MPa, be 299MPa with the tensile strength that stretching experiment obtains.It can
See, the test result of the efficiency curve obtained using the method for the present invention has more accuracy.
Claims (5)
1. a kind of evaluation metal material spherical shape indentation load-displacement curve validity method, it is characterised in that: this method includes
Following steps:
1) spherical micro-indentation test is carried out repeatedly to metal material to be measured, obtains a plurality of complete load-displacement curves；
2) validity of spherical indentation load-displacement curves is evaluated according to the contact stiffness of unloading curve.
2. the method for evaluation spherical indentation load displacement curve validity according to claim 1, it is characterised in that: step
1) micro-indentation test described in uses spherical indenter.
3. the method for evaluation spherical indentation load-displacement curves validity according to claim 1, it is characterised in that: step
It is rapid 1) described in complete load-displacement curves include loading curve and unloading curve.
4. the method for evaluation spherical indentation load-displacement curves validity according to claim 1, which is characterized in that step
It is rapid 2) in, the criterion of the validity of spherical indentation load-displacement curves are as follows: the maximum load of the contact stiffness of unloading curve
Lotus-displacement curve is efficiency curve.
5. the method for evaluation spherical indentation load-displacement curves validity according to claim 1, which is characterized in that step
It is rapid 2) described according to the contact stiffness of unloading curve evaluate spherical indentation load-displacement curves validity principle are as follows: it is same
When sample different location is pressed into, since there are flatness errors between actual samples and experiment porch, lead to connecing for unloading curve
Touching rigidity reduces.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836825A (en) * | 2019-11-29 | 2020-02-25 | 重庆交通大学 | Method for estimating tensile deformation of rubber-like superelasticity material in situ based on spherical indentation method |
| CN112305264A (en) * | 2020-10-30 | 2021-02-02 | 燕山大学 | Method for obtaining hardness and elastic modulus measurement values based on AFM nano indentation experiment |
| CN114935516A (en) * | 2022-04-28 | 2022-08-23 | 中国石油大学(华东) | Method for testing tensile property of metal material by adopting ball indentation method |
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| CN110836825A (en) * | 2019-11-29 | 2020-02-25 | 重庆交通大学 | Method for estimating tensile deformation of rubber-like superelasticity material in situ based on spherical indentation method |
| CN110836825B (en) * | 2019-11-29 | 2022-10-04 | 重庆交通大学 | Method for in-situ estimation of tensile deformation of rubber-like superelastic material by spherical indentation method |
| CN112305264A (en) * | 2020-10-30 | 2021-02-02 | 燕山大学 | Method for obtaining hardness and elastic modulus measurement values based on AFM nano indentation experiment |
| CN114935516A (en) * | 2022-04-28 | 2022-08-23 | 中国石油大学(华东) | Method for testing tensile property of metal material by adopting ball indentation method |
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