CN106289613A - A kind of assay method of symmetrical coating residual stress - Google Patents
A kind of assay method of symmetrical coating residual stress Download PDFInfo
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- CN106289613A CN106289613A CN201610665875.2A CN201610665875A CN106289613A CN 106289613 A CN106289613 A CN 106289613A CN 201610665875 A CN201610665875 A CN 201610665875A CN 106289613 A CN106289613 A CN 106289613A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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Abstract
The invention discloses the assay method of a kind of symmetrical coating residual stress, comprise the steps: to obtain related physical quantity；Symmetrical coating residual stress σ to be measured is calculated by following formulac:In formula: EsFor the elastic modelling quantity of the matrix of symmetrical coating sample to be measured, EcFor the elastic modelling quantity of the coating of symmetrical coating sample to be measured, H1/2For symmetrical coating sample to be measured matrix thickness 1/2nd, h is the thickness of the one side coating of symmetrical coating sample to be measured, νsFor the Poisson's ratio of the matrix of symmetrical coating sample to be measured, νcFor the Poisson's ratio of the coating of symmetrical coating sample to be measured, R is the radius of curvature of the matrix flexure of one side coating sample A.Present invention achieves the mensuration of symmetrical coating residual stress.
Description
Technical field
The present invention relates to coating Evaluating Mechanical Properties technical field, particularly relate to the mensuration of a kind of symmetrical coating residual stress
Method.
Background technology
Along with the development of science and technology, the working condition of engineering equipment and component is the harshest, to engineering material superficiality
Can require more and more higher, homogenous material is difficult to meet engineering demand, and various thin film or coating increasingly come into one's own, and obtain
Impressive progress, it is achieved that different functional effects, such as, optoelectronic film, stealthy thin film, heat insulating coat, corrosion-inhibiting coating etc..
Owing to coating material often can not be identical, after high temperature deposition coating with the thermal coefficient of expansion of matrix material
Being cooled in room temperature process, matrix can cause there is residual stress in film layer with the mutual constraint of coating.The existence of residual stress
Extension or the coating stripping of Interface Crack can be promoted, so accurately the residual stress in evaluation coating is to the safety of component and knot
Structure design is most important.
But, the development of residual stress evaluation and test lags far behind the development of coating technology.At present, most widely used
Coating residual stress evaluation methodology be curvature measurement method based on Stoney formula.Stoney formula is in 1909 by Soney
The calculating interfacial stress that year proposes, as shown in following formula 1,
Utilize Stoney formula, by measuring the curvature of matrix, the residual stress in coating can be tried to achieve.But, for
For being coated with the material of symmetrical coating, owing to it will not occur bending and deformation, cause utilizing Stoney formula to calculate it residual
Residue stress.
Inventor, during solving symmetrical coating residual stress analysis problem, proposes by measuring thermal coefficient of expansion
Mode evaluate symmetrical coating residual stress, but the method is only applicable to equality of temperature coating, and (i.e. matrix is in the preparation with coating
Same temperature, then it is cooled to the coating of room temperature simultaneously, the coating as used the modes such as CVD to prepare).For different temperature coating (i.e. base
Body and coating temperature in the preparation also differs, the coating prepared for example with modes such as thermal sprayings), the method can not be fitted
With.
Summary of the invention
In view of this, the embodiment of the present invention provides the assay method of a kind of symmetrical coating residual stress, and main purpose is real
The mensuration of existing symmetrical coating residual stress,
For reaching above-mentioned purpose, present invention generally provides following technical scheme:
On the one hand, embodiments provide the assay method of a kind of symmetrical coating residual stress, comprise the steps:
Obtain the elastic modelling quantity of the coating of symmetrical coating sample to be measured and the springform of the matrix of symmetrical coating sample to be measured
Amount；
Obtain thickness and the thickness of symmetrical coating sample matrix to be measured of symmetrical coating sample one side coating to be measured；
Obtain the Poisson's ratio of symmetrical coating sample matrix to be measured；
Prepare one side coating sample A, the matrix of the material of the matrix of one side coating sample A and symmetrical coating sample to be measured
Material is identical, the material of the material of the coating of one side coating sample A and preparation technology and the coating of symmetrical coating sample to be measured and
Preparation technology is identical；
Width and the length of described one side coating sample A are equal with the width of coated on both sides sample to be measured and length；
The matrix thickness of described one side coating sample A is 1/2nd of coated on both sides sample matrices thickness to be measured, one side
The coating layer thickness of coating sample A is identical with the thickness of the one side coating of coated on both sides sample to be measured；
Measure the radius of curvature of the matrix flexure of one side coating sample A；
Symmetrical coating residual stress σ to be measured is calculated by following formulac:
In formula: EsFor the elastic modelling quantity of the matrix of symmetrical coating sample to be measured, EcCoating for symmetrical coating sample to be measured
Elastic modelling quantity, H1/2For symmetrical coating sample to be measured matrix thickness 1/2nd, h is the list of symmetrical coating sample to be measured
The thickness of finishing coat, νsFor the Poisson's ratio of the matrix of symmetrical coating sample to be measured, νcPool for the coating of symmetrical coating sample to be measured
Pine ratio, R is the radius of curvature of the matrix flexure of one side coating sample A.
As preferably, the elastic modelling quantity of described symmetrical coating sample coating to be measured and the bullet of symmetrical coating sample matrix to be measured
Property modulus use relative method test obtain.
Compared with prior art, the beneficial effects of the present invention is:
The assay method of the symmetrical coating residual stress that the embodiment of the present invention provides is by improving Stoney formula, it is achieved
The mensuration of symmetrical coating residual stress, and the assay method that the present invention provides is applicable to all types of coating.
Accompanying drawing explanation
Fig. 1 is symmetrical coating residual stress equivalent schematic in the present invention；
Fig. 2 is embodiment of the present invention TC4 titanium alloy substrate/8YSZ thermal barrier coating sample schematic diagram；
Fig. 3 is one side coating sample A schematic diagram of the present invention；
Fig. 4 is one side coating sample A curvature radius calculation schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but not as a limitation of the invention.?
In the description below, what different " embodiments " or " embodiment " referred to is not necessarily same embodiment.Additionally, one or more is implemented
Special characteristic, structure or feature in example can be combined by any suitable form.
Fig. 1 is symmetrical coating residual stress equivalent schematic in the present invention.Seeing Fig. 1, the sample being coated with symmetrical coating can
Regard as and formed by the effect of being under pressure of the sample of two one side coatings, so the residual stress being coated with symmetrical coating sample can be regarded as
It is made up of the residual stress of one side coating being coated with same thickness coating and the residual stress that produced by pressure effect.Based on this
Principle, Stoney formula is improved by this case invention, it is achieved that the mensuration of symmetrical coating residual stress.Concrete scheme is as follows.
The assay method of a kind of symmetrical coating residual stress, comprises the steps:
Obtain the elastic modelling quantity of the coating of symmetrical coating sample to be measured and the springform of the matrix of symmetrical coating sample to be measured
Amount；
Obtain thickness and the thickness of symmetrical coating sample matrix to be measured of symmetrical coating sample one side coating to be measured；
Obtain the Poisson's ratio of symmetrical coating sample matrix to be measured；
Prepare one side coating sample A, the matrix of the material of the matrix of one side coating sample A and symmetrical coating sample to be measured
Material is identical, the material of the material of the coating of one side coating sample A and preparation technology and the coating of symmetrical coating sample to be measured and
Preparation technology is identical；
Width and the length of described one side coating sample A are equal with the width of coated on both sides sample to be measured and length；
The matrix thickness of described one side coating sample A is 1/2nd of coated on both sides sample matrices thickness to be measured, one side
The coating layer thickness of coating sample A is identical with the thickness of the one side coating of coated on both sides sample to be measured；
Measure the radius of curvature of the matrix flexure of one side coating sample A；
Symmetrical coating residual stress σ to be measured is calculated by following formulac:
In formula: EsFor the elastic modelling quantity of the matrix of symmetrical coating sample to be measured, EcCoating for symmetrical coating sample to be measured
Elastic modelling quantity, H1/2For symmetrical coating sample to be measured matrix thickness 1/2nd, h is the list of symmetrical coating sample to be measured
The thickness of finishing coat, νsFor the Poisson's ratio of the matrix of symmetrical coating sample to be measured, νcPool for the coating of symmetrical coating sample to be measured
Pine ratio, R is the radius of curvature of the matrix flexure of one side coating sample A.
Stoney formula is improved by the embodiment of the present invention, by evaluating the residual stress of one side coating, and then calculates
Go out the residual stress of symmetrical coating.The embodiment of the present invention solves the mensuration problem of symmetrical coating residual stress.And the present invention
The assay method range of embodiment is wide, is applicable to the various symmetrical coating residual stress such as equality of temperature coating and different temperature coating
Measure.
Preferred as above-described embodiment, the elastic modelling quantity of symmetrical coating sample coating to be measured and symmetrical coating sample to be measured
The concrete acquisition methods of the elastic modelling quantity of the matrix of coating does not limits.This gives a kind of method for optimizing selective,
In the present embodiment, the elastic modelling quantity of symmetrical coating sample coating to be measured and the springform of the matrix of symmetrical coating sample coating to be measured
Amount uses relative method test to obtain.
Equally, each step of the embodiment of the present invention not part to the greatest extent all can select suitable method or equipment from the prior art
Realize, do not repeat them here.
The measuring the method for the embodiment of the present invention and effect thereof of residual stress below by concrete symmetrical coating sample
Fruit illustrates.
The present embodiment is with TC4 titanium alloy substrate/8YSZ (mass fraction is the yttria-stabilized zirconia of 8%) thermal barrier coating
Sample carries out residual stress analysis as symmetrical coating sample to be measured.
Fig. 2 is the TC4 titanium alloy substrate/8YSZ thermal barrier coating sample (symmetrical coating sample to be measured) of the embodiment of the present invention
Structural representation.In Fig. 2, two apparent surfaces of TC4 titanium alloy substrate 2 are respectively provided with 8YSZ thermal barrier coating 1；This testing sample
Length L is 2500mm, and width B is 50mm, and matrix thickness H is 5mm, and coated on both sides thickness h is 323 μm.
Relative method is used to measure the 8YSZ thermal barrier coating 1 of testing sample and the elastic modelling quantity of TC4 titanium alloy substrate 2, specifically
Measurement process repeat no more, measurement result is as follows: the elastic modulus E c of coating is 37.80GPa, and the elastic modulus E s of matrix is
112.64GPa。
The 8YSZ thermal barrier coating of measuring samples and the Poisson's ratio of TC4 titanium alloy substrate, concrete measurement process repeats no more,
Measurement result is as follows: Poisson's ratio ν of coatingcIt is 0.2, Poisson's ratio ν of matrixsIt is 0.34.
Preparing one side coating sample A, its matrix uses and TC4 titanium alloy substrate/8YSZ thermal barrier coating sample phase with coating
Same material and preparation technology；
Fig. 3 is the structural representation of the one side coating sample A prepared.As it is shown on figure 3, the one of TC4 titanium alloy substrate 4
Side has 8YSZ thermal barrier coating 3.
The length and width of one side coating sample A is equal with TC4 titanium alloy substrate/8YSZ thermal barrier coating sample, concrete,
Length L of one side coating sample A is 2500mm, and width B is 50mm；
The matrix thickness of one side coating sample A is 1/2nd of symmetrical coating sample matrix thickness to be measured, one side coating
The coating layer thickness of sample A is equal with the thickness of the one side coating of symmetrical coating sample to be measured, concrete, one side coating sample A's
Matrix thickness H1/2It is 323 μm for 2.5mm, the coating layer thickness h of one side coating sample A；
Tool microscope is used to measure the radius of curvature that the matrix of one side coating sample A bends, as shown in Figure 4, by surveying
The coordinate of amount point 5,6,7 can calculate the radius of curvature of the matrix flexure of one side coating sample A, and concrete measurement process is no longer
Repeating, measurement result is as follows: the radius of curvature of the matrix flexure of one side coating sample A is 12.086m；
Symmetrical coating residual stress σ to be measured is calculated by following formulac:
In formula: EsFor the elastic modelling quantity of TC4 titanium alloy substrate, EcFor the elastic modelling quantity of 8YSZ thermal barrier coating, H1/2For TC4 titanium
The 1/2 of the thickness of alloy substrate, h is the thickness of 8YSZ thermal barrier coating, νsFor the Poisson's ratio of TC4 titanium alloy substrate, νcFor 8YSZ heat
The Poisson's ratio of barrier coating, R is the radius of curvature of the matrix flexure of one side coating sample A.
The residual stress being calculated symmetrical coating sample (TC4 titanium alloy substrate/8YSZ thermal barrier coating sample) to be measured is
51.1MPa。
By above-described embodiment it can be seen that the assay method of symmetrical coating residual stress disclosed in the embodiment of the present invention is
Improve on the basis of Stoney formula, based on one side coating sample, and then obtain the coated on both sides sample of symmetry
Residual stress.Therefore be applicable to various types of coating sample, the coating that either which kind of technique is formed, the most either which kind of
The matrix of material, coating, the method that all can use the embodiment of the present invention to provide measures its coating residual stress.Therefore, for other
The mensuration of the residual stress of the coating of type provides embodiment the most one by one.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (2)
1. the assay method of a symmetrical coating residual stress, it is characterised in that comprise the steps:
Obtain the elastic modelling quantity of the coating of symmetrical coating sample to be measured and the elastic modelling quantity of the matrix of symmetrical coating sample to be measured；
Obtain thickness and the thickness of symmetrical coating sample matrix to be measured of symmetrical coating sample one side coating to be measured；
Obtain the Poisson's ratio of symmetrical coating sample matrix to be measured；
Prepare one side coating sample A, the material of the matrix of the material of the matrix of one side coating sample A and symmetrical coating sample to be measured
Identical, the material of the coating of the material of the coating of one side coating sample A and preparation technology and symmetrical coating sample to be measured and preparation
Technique is identical；
Width and the length of described one side coating sample A are equal with the width of coated on both sides sample to be measured and length；
The matrix thickness of described one side coating sample A is 1/2nd of coated on both sides sample matrices thickness to be measured, one side coating
The coating layer thickness of sample A is identical with the thickness of the one side coating of coated on both sides sample to be measured；
Measure the radius of curvature of the matrix flexure of one side coating sample A；
Symmetrical coating residual stress σ to be measured is calculated by following formulac:
In formula: EsFor the elastic modelling quantity of the matrix of symmetrical coating sample to be measured, EcElasticity for the coating of symmetrical coating sample to be measured
Modulus, H1/2For symmetrical coating sample to be measured matrix thickness 1/2nd, h is that the one side of symmetrical coating sample to be measured is coated with
The thickness of layer, νsFor the Poisson's ratio of the matrix of symmetrical coating sample to be measured, νcPoisson for the coating of symmetrical coating sample to be measured
Ratio, R is the radius of curvature of the matrix flexure of one side coating sample A.
2. the method described in claim 1, it is characterised in that the elastic modelling quantity of described symmetrical coating sample coating to be measured and to be measured
The elastic modelling quantity of symmetrical coating sample matrix uses relative method test to obtain.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107356477A (en) * | 2017-06-21 | 2017-11-17 | 中国建材检验认证集团股份有限公司 | Cement base mechanical properties of tubular goods method of testing |
| CN108844824A (en) * | 2018-06-27 | 2018-11-20 | 西南交通大学 | A kind of known materials residual stress analysis method based on conical pressure head |
| CN110779863A (en) * | 2019-11-06 | 2020-02-11 | 江苏集萃安泰创明先进能源材料研究院有限公司 | Method for evaluating residual thermal stress of amorphous alloy thin strip |
| CN112629725A (en) * | 2020-12-04 | 2021-04-09 | 江苏徐工工程机械研究院有限公司 | Method for testing residual stress of piston rod spraying coating |
| CN112880618A (en) * | 2021-01-15 | 2021-06-01 | 中国民航大学 | Method for measuring curvature radius of APS coating residual stress test piece based on parabolic model |
| CN114894834A (en) * | 2022-07-15 | 2022-08-12 | 西安交通大学 | Device and method for measuring force and heat parameters of high-temperature heat-proof structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107356477A (en) * | 2017-06-21 | 2017-11-17 | 中国建材检验认证集团股份有限公司 | Cement base mechanical properties of tubular goods method of testing |
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| CN108844824A (en) * | 2018-06-27 | 2018-11-20 | 西南交通大学 | A kind of known materials residual stress analysis method based on conical pressure head |
| CN108844824B (en) * | 2018-06-27 | 2020-09-08 | 西南交通大学 | Known material residual stress measuring method based on conical pressure head |
| CN110779863A (en) * | 2019-11-06 | 2020-02-11 | 江苏集萃安泰创明先进能源材料研究院有限公司 | Method for evaluating residual thermal stress of amorphous alloy thin strip |
| CN110779863B (en) * | 2019-11-06 | 2022-03-29 | 江苏集萃安泰创明先进能源材料研究院有限公司 | Method for evaluating residual thermal stress of amorphous alloy thin strip |
| CN112629725A (en) * | 2020-12-04 | 2021-04-09 | 江苏徐工工程机械研究院有限公司 | Method for testing residual stress of piston rod spraying coating |
| CN112880618A (en) * | 2021-01-15 | 2021-06-01 | 中国民航大学 | Method for measuring curvature radius of APS coating residual stress test piece based on parabolic model |
| CN114894834A (en) * | 2022-07-15 | 2022-08-12 | 西安交通大学 | Device and method for measuring force and heat parameters of high-temperature heat-proof structure |
| CN114894834B (en) * | 2022-07-15 | 2022-10-04 | 西安交通大学 | Device and method for measuring force and heat parameters of high-temperature heat-proof structure |
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