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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 PDF

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Publication number
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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curve
validity
load
displacement
spherical
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CN201810796707.6A
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阚盈
陈静
陈怀宁
李东旭
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Institute of Metal Research of CAS
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Institute of Metal Research of CAS
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    • G—PHYSICS
    • 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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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

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

A method of evaluation metal material spherical shape indentation load-displacement curve validity
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)

1.一种评定金属材料球形压痕载荷-位移曲线有效性的方法，其特征在于：该方法包括如下步骤：1. A method for evaluating the validity of the spherical indentation load-displacement curve of metallic materials, characterized in that: the method may further comprise the steps: 1)对待测金属材料进行多次球形压入实验，获得多条完整的载荷-位移曲线；1) Perform multiple spherical indentation experiments on the metal material to be tested to obtain multiple complete load-displacement curves; 2)根据卸载曲线的接触刚度评定球形压痕载荷-位移曲线的有效性。2) Evaluate the validity of the spherical indentation load-displacement curve according to the contact stiffness of the unloading curve. 2.根据权利要求1所述的评定球形压痕载荷位移曲线有效性的方法，其特征在于：步骤1)中所述压入实验采用球形压头。2. The method for evaluating the validity of the spherical indentation load-displacement curve according to claim 1, characterized in that: the indentation test in step 1) uses a spherical indenter. 3.根据权利要求1所述的评定球形压痕载荷-位移曲线有效性的方法，其特征在于：步骤1)中所述完整的载荷-位移曲线包括加载曲线和卸载曲线。3. The method for evaluating the validity of a spherical indentation load-displacement curve according to claim 1, wherein the complete load-displacement curve in step 1) includes a loading curve and an unloading curve. 4.根据权利要求1所述的评定球形压痕载荷-位移曲线有效性的方法，其特征在于，步骤2)中，球形压痕载荷-位移曲线的有效性的判定标准为：卸载曲线的接触刚度最大的载荷-位移曲线为有效曲线。4. The method for evaluating the validity of the spherical indentation load-displacement curve according to claim 1, characterized in that, in step 2), the criterion for the validity of the spherical indentation load-displacement curve is: the contact of the unloading curve The load-displacement curve with the greatest stiffness is the effective curve. 5.根据权利要求1所述的评定球形压痕载荷-位移曲线有效性的方法，其特征在于，步骤2)所述的根据卸载曲线的接触刚度评定球形压痕载荷-位移曲线有效性的原理为：同一试样不同位置压入时，由于实际试样与实验平台之间存在平面度误差，导致卸载曲线的接触刚度降低。5. The method for evaluating the validity of the spherical indentation load-displacement curve according to claim 1, characterized in that, the principle of evaluating the validity of the spherical indentation load-displacement curve according to the contact stiffness of the unloading curve described in step 2) It is: when the same sample is pressed in different positions, due to the flatness error between the actual sample and the experimental platform, the contact stiffness of the unloading curve decreases.
CN201810796707.6A 2018-07-19 2018-07-19 A method of evaluation metal material spherical shape indentation load-displacement curve validity Pending CN109060528A (en)

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CN110836825A (en) * 2019-11-29 2020-02-25 重庆交通大学 In situ estimation of tensile deformation of rubber-like hyperelastic materials 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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Publication number Priority date Publication date Assignee Title
CN110836825A (en) * 2019-11-29 2020-02-25 重庆交通大学 In situ estimation of tensile deformation of rubber-like hyperelastic materials based on spherical indentation method
CN110836825B (en) * 2019-11-29 2022-10-04 重庆交通大学 In situ estimation of tensile deformation of rubber-like superelastic materials by spherical indentation
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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Application publication date: 20181221