CN101236152B - Bullet impact method for testing coating/ thin film basal body interface bond strength - Google Patents
Bullet impact method for testing coating/ thin film basal body interface bond strength Download PDFInfo
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- CN101236152B CN101236152B CN2008101012994A CN200810101299A CN101236152B CN 101236152 B CN101236152 B CN 101236152B CN 2008101012994 A CN2008101012994 A CN 2008101012994A CN 200810101299 A CN200810101299 A CN 200810101299A CN 101236152 B CN101236152 B CN 101236152B
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- thin film
- body interface
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Abstract
The invention discloses a bullet impact method for measuring coating/film-basal body interface bonding strength, which comprises the following steps of preparing a flat plate sampling covered by the coating to be measured; preparing a bullet with coating, wherein the basal body of the bullet being made of material with lower acoustic impedance; firing out the bullet with a launching device to enable the bullet to impact the basal body surface of the sample with the coating part of the bullet being perpendicular to the basal body surface; measuring the initial speed of the bullet when touching the sample, and obtaining the sample coating/film-basal body interface stress history according to the known numerical calculation and theoretical analysis; measuring the coating/film-basal body interface stripping characteristic size of the sample, and establishing the relationship between the coating/film-basal body interface stress history and the coating/film-basal body interface stripping characteristic size to evaluate the coating/film-basal body interface bonding performance. The invention which has a simple principle and a clear model is capable of measuring the coating/film-basal body interface bonding performance of a tight bonding coating and the coating/film-basal body interface dynamic performance with high operationability.
Description
Technical field
The present invention relates to the coating/thin film technical field, particularly a kind of bullet impact method of measuring coating/thin film basal body interface bond strength.
Background technology
The matter of utmost importance of coating/thin film technology is present in combining of coating/thin film and matrix usually, and the laboratory of the actual bond strength of coating/thin film basal body interface characterizes, be exactly by design load mode release coating/film, and set up the relation that coating/thin film is peeled off behavior and load.
Since the coating/thin film matrix system stride the yardstick architectural feature, how on coating/thin film basal body interface effectively imposed load to come release coating/film be the difficult point and the focus of test design always.All in all, early stage more common load mode all is quasi-static, and can roughly include three major types in, the first kind is to make coating/thin film that thereby the method that local deformation transfers loads to coating/thin film basal body interface take place, as scarification (being aided with examination means such as acoustic emission, tangential force, immersion needle), indentation method with scrape strip; Second class is thereby that matrix is deformed with the method for load transfer to coating/thin film basal body interface, as bending method, substrate pulling method, side plunging; The 3rd class is to use the measuring method of cementing agent, expands out in the coating/thin film side by cementing agent and can apply the supplementary structure that draws, turns round load easily.These traditional method of testings have satisfied some actual demands of engineering to a great extent, but deficiency and limitation that they exist also are well-known: it is clear that there is the Deformation Height localization in preceding two class methods, large deformation makes that mechanical model is difficult to, thereby the qualitative relationships that coating/thin film is peeled off with load is difficult to obtain, and bear tangential force and normal force on the coating/thin film basal body interface simultaneously, can't isolate coating/thin film basal body interface shear failure intensity and fail in tension intensity; Though and the 3rd class methods can produce the coating/thin film basal body interface load modes of low degree of mixing, also provide fairly simple model description, but can only test out more weak coating/thin film basal body interface bond strength owing to be subject to the intensity of cementing agent itself.Simultaneously, above method can't be tested dynamically (improved strain rate) coating/thin film basal body interface bonding properties.
At these problems, Vossen etc. have proposed so-called laser slabbing method.The initial thought of laser slabbing method is to impact the matrix surface of dull and stereotyped sample with short-pulse laser, the explosivity gasification of matrix skin-material produces high-intensity compression stress wave, this wave of compression is propagated to the coating/thin film side along sample, reflection and transmission will take place at the coating/thin film basal body interface place, the transmission wave of compression reflects to form the stretching ripple at the coating/thin film Free Surface, and this stretching ripple and incident wave produce drawing stress and make coating/thin film ftracture along coating/thin film basal body interface in the stack of coating/thin film basal body interface place.Usefulness triangular column samples such as WangJunlan replace dull and stereotyped sample to realize the shearing of coating/thin film basal body interface, stretch to mix to load and peel off, and make the intension of this method further obtain expanding.Yet, all mention as above-mentioned researcher, because laser slabbing method uses laser that matrix material is gasified at a high speed, this process has comprised complicated heat-physics-mechanical process, therefore the modelling research of overall process is quite difficult, and stress history is difficult to clear description.
After this, propositions such as Hou Zhende utilize Hopkinson strut device principle, with Metallic rod impact specimen matrix side, make drawing stress at the coating/thin film basal body interface place and assess coating/thin film basal body interface bond strength.This method is in conjunction with relative more weak thick coating/film, has that principle is clear, model relatively simply reaches workable advantage.But the load level that this method can provide is lower, for assessing (from this angle, binder method even can reach higher stress level) in conjunction with the coating/thin film basal body interface bonding properties by force; This method need be made elongate rod with matrix simultaneously, and at rod end coating coating/thin film, this sample production requires too high then; And this method only is applicable to thicker coating.
Summary of the invention
Problem at the prior art existence, the purpose of this invention is to provide that a kind of principle is simple, model is clear, can test the coating/thin film basal body interface bonding properties of strong combination, can the testing coating/thin film basal body interface dynamic property, workable method.
For achieving the above object, the invention provides a kind of bullet impact method of testing coating/thin film basal body interface bond strength, these method concrete steps are as follows:
1) preparation scribbles the dull and stereotyped sample of coating to be measured;
2) preparation scribbles the bullet of coating, and the bullet matrix is made by the lower material of acoustic impedance;
3) launch bullet with emitter, make bullet to be covered with the matrix surface on the coating one end vertical impact sample;
Initial velocity when 4) the measurement bullet contacts with sample, and, try to achieve sample coating/thin film basal body interface stress history by existing numerical evaluation and theoretical analysis method;
5) measure coating/thin film basal body interface release characteristics size on the sample, set up the relation of coating/thin film basal body interface stress history and coating/thin film basal body interface release characteristics size, with evaluation coating/thin film basal body interface bonding properties.
Further, the coating/thin film basal body interface release characteristics size in the described step 5) is specially the radius of stripping area.
Further, described bullet is cylindrical, and coating is positioned at columniform front end face.
Further, the material of described bullet matrix is plastics.
Further, described emitter is air gun, ballistic rifle or gas big gun.
The present invention is by the matrix surface of the dull and stereotyped sample of the bullet impact coating of employing coating, set up the relation of coating/thin film basal body interface stress history and coating/thin film basal body interface release characteristics size, estimate the interfacial combined function of coating/thin film basal body, can either test the coating/thin film basal body interface bonding properties of strong combination, also can the testing coating/thin film basal body interface dynamic property, have advantages such as principle is simple, model is clear, workable.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 1 is the bullet impact method stereographic map of the testing coating/thin film basal body interface bond strength that proposes of the present invention;
Fig. 2 is the bullet impact method front view of the testing coating/thin film basal body interface bond strength that proposes of the present invention;
Fig. 3 is the bullet impact method matrix surface and the sample coating/thin film basal body interface normal stress variation diagram of the testing coating/thin film basal body interface bond strength that proposes of the present invention.
Embodiment
Embodiment 1:
Referring to Fig. 1 and Fig. 2, the bullet impact method that the inventor proposes based on the slabbing effect, ultimate principle is as cylinder bullet 1 with the lower material of acoustic impedance (as plastics), be made up of columniform bullet matrix 11 and the bullet coating 12 that is plated on bullet matrix 11 front end faces, the acoustic impedance of bullet coating 12 and matrix of samples 21 are approaching.
According to theory of stress wave, producing the stress disturbance level in the matrix side is σ
iCompression stress wave direction sample inside and coating/thin film side when propagating, will reflection and transmission take place at coating/thin film, matrix, coating/thin film basal body interface place; And transmitted wave will reflect to form the stretching ripple when propagating into the coating/thin film Free Surface.
The reflection wave that the coating/thin film basal body interface place produces is simple rarefaction wave σ
R1, and have
σ
r1＝F×σ
i
Transmitted wave is rarefaction wave σ
t, and have
σ
i＝T×σ
i
Wherein
Be called reflection coefficient and transmission coefficient.
Here n=(ρ
0C
0)
s/ (ρ
0C
0)
c, be the ratio of the acoustic impedance of matrix (s represents with the footnote symbol) and coating/thin film (c represents with the footmark symbol).ρ wherein
0The density of expression material, C
0Be illustrated in the velocity of sound in this material.
Transmitted wave σ
tReflection wave σ in the generation of coating/thin film Free Surface
R2, have
σ
r2＝-σ
t
Stress level σ at the coating/thin film basal body interface place should be incident wave σ
i, reflection wave σ
R1, transmitted wave σ
tWith reflection wave σ
R2Stack.Thickness by control bullet coating can make tension at first appear in the coating/thin film basal body interface near zone, thereby be expected coating-substrate is peeled off along coating/thin film basal body interface.If continue to use classical maximum tension stress criterion, can think that working as coating/thin film basal body interface place tensile stress sigma meets or exceeds material tension critical value σ
c, promptly as σ 〉=σ
cThe time separation of coating/thin film basal body along coating/thin film basal body interface appear.
By measuring muzzle velocity degree (being the bullet impact sample speed of preceding moment), can obtain coating/thin film basal body interface stress history by theoretical analysis, thereby can set up related that coating/thin film basal body interface stress history and coating/thin film basal body interface peel off, obtain coating/thin film basal body interface bonding properties index.Observe coating/thin film basal body interface and destroy pattern, measure coating/thin film basal body interface release characteristics size; Set up the relation of coating/thin film basal body interface stress history and coating/thin film basal body interface release characteristics size, estimate the coating/thin film basal body interface bonding properties.
For example, bullet length l=5mm, radius r=2.5mm, matrix of samples thickness t
s=1mm, radius of specimen r
s=10mm and bullet coating thickness t
cWith sample coating thickness t
fIdentical and be 0.1mm, record muzzle velocity degree V
0=250m/s.
Material constant is as shown in table 1
Table 1 material constant
| Item | ρ(Kg/m 3) | E(GPa) | υ |
| 1 2 3 | 1050 7850 7190 | 3.38 209 242 | 0.35 0.30 0.15 |
1-bullet wherein; 2-bullet coating, matrix of samples; 3-sample coating; ρ-density, E-elastic modulus, υ-Poisson ratio.
Calculate and can get with finite element method, matrix surface stress and coating/thin film basal body interface stress change as shown in Figure 3 in time.Wherein ordinate is represented the coating/thin film basal body interface normal stress, and on the occasion of being tension, negative value is a compressive stress.As seen coating/thin film basal body interface is in after the compression stress pulse when 0.25 microsecond (about), tension occurred, and this drawing stress will cause sample coating/thin film basal body interface germinating damage, coating/thin film basal body interface occurs peels off.
The dynamic approach energy Validity Test coating/thin film basal body interface bonding properties of this manufacturing compression stress wave, this method both can have been avoided the complicated physical process of laser-impact in the laser slabbing method, can overcome the low and demanding problem of specimen preparation of Hopkinson depression bar method stress level again.
Claims (5)
1. the bullet impact method of a testing coating/thin film basal body interface bond strength is characterized in that, comprises the steps:
1) preparation scribbles the dull and stereotyped sample of coating to be measured;
2) preparation has the bullet of bullet coating, and the bullet matrix is made by the lower material of acoustic impedance;
3) launch bullet with emitter, make bullet to be covered with the matrix surface on the vertical impact sample of coating position;
Initial velocity when 4) the measurement bullet contacts with sample, and, try to achieve sample coating/thin film basal body interface stress history by known numerical evaluation and theoretical analysis;
5) measure coating/thin film basal body interface release characteristics size on the sample, set up the relation of coating/thin film basal body interface stress history and coating/thin film basal body interface release characteristics size, with evaluation coating/thin film basal body interface bonding properties.
2. the bullet impact method of testing coating/thin film basal body interface bond strength according to claim 1 is characterized in that, the coating/thin film basal body interface release characteristics size in the described step 5) is specially the radius of stripping area.
3. the bullet impact method of testing coating/thin film basal body interface bond strength according to claim 1 is characterized in that, described bullet is cylindrical, and coating is positioned at columniform front end face.
4. the bullet impact method of testing coating/thin film basal body interface bond strength according to claim 1 is characterized in that, the material of described bullet matrix is plastics.
5. the bullet impact method of testing coating/thin film basal body interface bond strength according to claim 1 is characterized in that, described emitter is air gun, ballistic rifle or gas big gun.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101012994A CN101236152B (en) | 2008-03-03 | 2008-03-03 | Bullet impact method for testing coating/ thin film basal body interface bond strength |
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|---|---|---|---|
| CN2008101012994A CN101236152B (en) | 2008-03-03 | 2008-03-03 | Bullet impact method for testing coating/ thin film basal body interface bond strength |
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| CN101236152B true CN101236152B (en) | 2010-12-01 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101441163B (en) * | 2008-11-10 | 2012-05-30 | 中国科学院力学研究所 | Bullet shock testing method of coating layer-substrate interface binding performance |
| CN102023120B (en) * | 2009-09-14 | 2012-07-11 | 北京科技大学 | Fatigue tester for interface between film and substrate |
| CN103163037B (en) * | 2013-02-07 | 2015-04-29 | 中国科学院力学研究所 | High-speed restrained cutting experimental device based on split Hopkinson pressure bar loading technology |
| CN105527164B (en) * | 2015-12-30 | 2018-03-13 | 银邦金属复合材料股份有限公司 | Sample bonding, drawing die and sample bonding, drawing process |
| CN110411866B (en) * | 2019-07-26 | 2021-08-20 | 江西省科学院应用物理研究所 | Method for predicting coating interface shear strength through drop hammer impact performance |
| CN112394029B (en) * | 2019-08-13 | 2023-03-17 | 宝山钢铁股份有限公司 | Simulation liquid for evaluating film binding force on surface of coated iron and evaluation method thereof |
| CN110864843B (en) * | 2019-10-23 | 2021-07-09 | 广州市昊志机电股份有限公司 | Impact force detection method, system and device for flexible wheel shot blasting and storage medium |
| CN111413274A (en) * | 2020-04-21 | 2020-07-14 | 延边长白山印务有限公司 | Method for detecting interlayer binding degree of paper |
| CN116680025A (en) * | 2023-05-29 | 2023-09-01 | 上海宇泽机电设备有限公司 | Method and system for dynamically adjusting interaction interface of film slitting equipment |
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