CN110411866B - Method for predicting coating interface shear strength through drop hammer impact performance - Google Patents

Method for predicting coating interface shear strength through drop hammer impact performance Download PDF

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CN110411866B
CN110411866B CN201910680458.9A CN201910680458A CN110411866B CN 110411866 B CN110411866 B CN 110411866B CN 201910680458 A CN201910680458 A CN 201910680458A CN 110411866 B CN110411866 B CN 110411866B
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coating
shear strength
drop hammer
interface
hammer impact
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CN110411866A (en
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郭慧
陈新贵
王德
王志超
程香平
张友亮
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Institute of Applied Physics of Jiangxi Academy of Sciences
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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
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • 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
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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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
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Abstract

A method for predicting the shear strength of a coating interface through drop hammer impact performance comprises the following steps: (1) performing nano indentation test on the coating to respectively obtain the Young modulus of the coating and the Young modulus of the substrateE cAndE spoisson
Figure DEST_PATH_IMAGE001
Ratio of
Figure DEST_PATH_IMAGE002
(ii) a (2) Performing drop hammer impact test to obtain the critical speed of cracking of the coating interfacev maxAnd finding the critical loadF max(ii) a (3) Establishing a critical loadF maxAnd the thickness of the coatingtThe interface shear strength of the coating is obtained through a fitted curve
Figure DEST_PATH_IMAGE003
The predicted value of (2). According to the invention, the interface shear strength of the coating can be rapidly predicted by establishing the relationship between the shear strength and the impact property.

Description

Method for predicting coating interface shear strength through drop hammer impact performance
Technical Field
The invention relates to a method for predicting the shear strength of a coating interface through the drop hammer impact performance, belonging to the technical field of coating detection.
Background
The shear strength of the coating and the substrate directly affects the strength and toughness of the coating and finally determines the service performance of the coating, so that accurate assessment of the interfacial shear strength plays an important role in engineering material development and application.
The traditional method for testing the shear strength of the coating interface mainly comprises a press-in method and a drawing method, wherein the press-in method specifies that the thickness of the coating is 0.8-1.1 mm, and the coating is not suitable for a coating with a small thickness; the drawing method can measure the shear strength by the shear failure of the coating, but the data points are scattered. Therefore, how to provide a simple and accurate method for predicting the interfacial shear strength aiming at the shear damage mechanism caused by the drop hammer impact of the coating becomes an urgent need in the field of current shear failure.
Disclosure of Invention
The invention aims to solve the problem of shear strength dispersion caused by a drawing test and simply and conveniently realize high-efficiency prediction of the shear strength, and provides a method for predicting the shear strength of a coating interface through drop hammer impact performance.
The method comprises the following steps of predicting the shear strength of a coating interface through drop hammer impact performance, and respectively carrying out drop hammer impact tests on coatings with different thicknesses to obtain the cracking critical load of the coating interface; and establishing a relation between the critical load and the coating thickness, and obtaining a slope through fitting a curve to obtain a predicted value of the interface shear strength.
A method for predicting the shear strength of a coating interface through drop hammer impact performance comprises the following steps:
(1) nanoindentation test
Selecting coatings with different thicknesses as nanoindentation samples to perform nanoindentation test to obtain Young modulus E of the coatings and the substrate with different thicknessescAnd EsA value;
(2) drop hammer impact test
Respectively carrying out drop hammer impact tests on coatings with different thicknesses to obtain critical impact energy of interface cracking and critical velocity vmaxAnd the measured Young's modulus Ec、EsAnd poisson ratio vc、νsSubstituting the following formulaIn the method, the critical load F of the cracking of the coating interface is obtainedmax：
Figure BDA0002144582920000021
Where ρ is the density of the coating, coefficient
Figure BDA0002144582920000022
νcV and vsRespectively the Poisson's ratio of the coating and the substrate, and R is the radius of a falling ball;
(3) interfacial shear strength prediction
Bringing the critical load into the following formula, establishing a critical load FmaxAnd the relation between the thickness t of the coating and the slope is obtained by fitting a curve, so that a predicted value of the interface shear strength tau is obtained:
Figure BDA0002144582920000023
the coatings with different thicknesses are coatings with the thickness of 200-800 mu m obtained by changing different hot spraying time.
The surface of the nano indentation sample needs to be subjected to uniform polishing treatment, and then the indentation test is carried out by selecting the required loading condition.
The drop hammer impact test is to carry out drop hammer impact test on the coating by adjusting the height of the drop hammer to change impact energy.
The method has the advantages that the method is a method for rapidly estimating the shear strength of the interface based on the drop hammer impact performance of the coating; the method solves the problem of shear strength dispersion caused by the drawing test, and realizes the high-efficiency prediction of the shear strength simply and conveniently. The method is convenient to implement, simple to operate and capable of being widely applied to different coatings.
Drawings
FIG. 1 is a flow chart of a method for predicting the shear strength of a coating interface;
FIG. 2 is a cross-sectional SEM image of an amorphous coating of example 1;
FIG. 3 is the results of predicting the interfacial shear strength of the amorphous coating in example 1;
FIG. 4 is a cross-sectional SEM image of the crystalline coating of example 2;
FIG. 5 shows the results of predicting the interfacial shear strength of the crystalline coating in example 2.
Detailed Description
A specific embodiment of the present invention is shown in fig. 1.
The embodiment of the invention relates to a method for predicting the shear strength of a coating interface through drop hammer impact performance, which comprises the following steps:
(1) performing nano indentation test on the coating to respectively obtain the Young modulus E of the coating and the substratecAnd EsPoisson ratio vcV and vs；
(2) Performing drop hammer impact test to obtain the critical speed v of the coating interface crackingmaxAnd calculating a critical load Fmax；
(3) Establishing a critical load FmaxAnd (4) obtaining a predicted value of the interfacial shear strength tau of the coating through a fitted curve according to the relation between the coating thickness t and the coating.
Example 1
In this embodiment, the interfacial shear strength of the amorphous coating is predicted, and the 200-800 μm thick coating is tested, as shown in fig. 2, which is a cross-sectional SEM image of the intermediate amorphous coating.
Step one, carrying out nano indentation experiments on coatings with different thicknesses to obtain Young modulus E of the coatings and the substratecAnd EsThe value is obtained.
Step two, performing drop hammer impact test to obtain critical load F of cracking of the coating interfacemax。
Step three, according to the critical load FmaxThe interface shear strength tau of the coating is predicted in relation to the coating thickness t. FIG. 3 shows the relationship between the predicted values and the values of the drawing experiment.
Example 2
In the embodiment, the interfacial shear strength of the crystal coating is predicted, and the coating with the thickness of 200-800 mu m is tested; a cross-sectional SEM image of the medium crystal coating is shown in fig. 4.
Step one, carrying out nano indentation experiments on coatings with different thicknesses to obtain Young modulus E of the coatings and the substratecAnd EsThe value is obtained.
Step two, performing drop hammer impact test to obtain critical load F of cracking of the coating interfacemax。
Step three, according to the critical load FmaxThe interface shear strength tau of the coating is predicted in relation to the coating thickness t. Fig. 5 shows the relationship between the predicted values and the values of the drawing experiment.
The foregoing embodiments are merely illustrative of the principles and capabilities of the present invention, and not all statements thereof which as a matter of departure from the scope of the invention may be had by the following examples without the use of inventive faculty.

Claims (4)

1. A method for predicting the shear strength of a coating interface through drop hammer impact performance is characterized in that the method obtains the cracking critical load of the coating interface by respectively carrying out drop hammer impact tests on coatings with different thicknesses; establishing a relation between the critical load and the coating thickness, and obtaining a slope through a fitting curve to obtain an interface shear strength predicted value;
the method comprises the following steps:
(1) nanoindentation test
Selecting coatings with different thicknesses as nanoindentation samples to perform nanoindentation test to obtain Young modulus E of the coatings and the substrate with different thicknessescAnd EsA value;
(2) drop hammer impact test
Respectively carrying out drop hammer impact tests on coatings with different thicknesses to obtain critical impact energy of interface cracking and critical velocity vmaxAnd the measured Young's modulus Ec、EsAnd poisson ratio vc、νsSubstituting the formula to obtain the critical load F of the cracking of the coating interfacemax：
Figure FDA0003135658120000011
Where ρ is the density of the coating, coefficient
Figure FDA0003135658120000012
νcV and vsRespectively the Poisson's ratio of the coating and the substrate, and R is the radius of a falling ball;
(3) interfacial shear strength prediction
Bringing the critical load into the following formula, establishing a critical load FmaxAnd the relation between the thickness t of the coating and the slope is obtained by fitting a curve, and then the predicted value of the interface shear strength tau is obtained:
Figure FDA0003135658120000013
2. the method for predicting the interfacial shear strength of the coating through the drop hammer impact performance as claimed in claim 1, wherein the coatings with different thicknesses are coatings with the thickness of 200-800 μm obtained by changing different thermal spraying times.
3. The method for predicting the interfacial shear strength of the coating through the drop hammer impact performance according to claim 1, wherein the surface of the nano indentation sample is subjected to a uniform polishing treatment, and then the indentation test is performed by selecting the required loading conditions.
4. The method for predicting the interfacial shear strength of the coating through the drop hammer impact performance according to claim 1, wherein the drop hammer impact test is carried out on the coating by adjusting the height of the drop hammer to change the impact energy.
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