CN103837470A - Flat bottom cylinder loading measurement method for adhesive force between film and base layer - Google Patents

Abstract

The invention discloses a flat bottom cylinder loading measurement method for the adhesive force between a film and a base layer. The method comprises the steps of forming a small hole which runs through the base layer and has the radius of d in the base layer of a film/base layer system, adopting a friction-free flat bottom cylinder with the radius of b as a loading shaft, applying the load F to a coating film via the small hole in the base layer so as to enable the coating film with the thickness of h, the elastic modulus of E and the poisson ratio of v to get away from the base layer and form a stable bubble with the radius of a, wherein b is less than d; on the basis of static equilibrium analysis of the stable bubble, accurately calculating the adhesive force FG between the film and the base layer by utilizing the bubble deflection measurement value wb at the part with the radius r=b.

Description

Between a kind of film and basic unit, the flat right cylinder of adhesion adds load measuring method

Technical field

The present invention relates to the measuring technology of adhesion between film and basic unit.

Background technology

Film/basic unit system has a wide range of applications in fields such as machinery, electronics, bioengineering, the accurate test of surface film Young's modulus of elasticity, Poisson ratio, unrelieved stress and film/base Interface Adhesion intensity, stability, reliability and durability analysis to structure have important mechanical meaning, thereby the whole bag of tricks is used to test these mechanical properties.

Conventional method of testing mainly contains: 1. adopt unidirectional micro-stretching, beam deflection, static pressure bubbling (expansion), axle to carry the method for testings such as bubbling, ultrasonic velocity, resonant frequency, impression, X-ray diffraction, optical fluorescence, Raman spectrum, obtain the information of surface film elastic modulus, Poisson ratio and unrelieved stress.2. adopt vertical strain, horizontal moment, ultracentrifugation, ultra sonic oscillation, adhesive tape, peeling, shearing, scraping, static pressure bubbling (expansion), axle to carry the method for testings such as bubbling, chemical solution are antipyretic, X ray, semi-girder, obtain the information of film/base Interface Adhesion intensity.

Since be noted that test to as if some mechanical parameters, the test result that therefore adopts some mechanical methods (by a macromechanics process) to obtain, than methods such as employing sound, light, come intuitively.The present invention is based on macro_elasticity theory behavior and have the consideration of intuitive, the method that adopts axle to load bubbling realizes the layering of film/base, and then the measuring technology of adhesion between research film and basic unit.

Axle loads bubbling and compares to static pressure loading bubbling, aspect the hierarchical control of film/base, there is certain advantage, but existing axle loads bubbling measuring technology, owing to not providing the accurate answer of bubbling film statical equilibrium problem, thereby can not realize the accurate test of adhesion between film and basic unit.

Summary of the invention

In order to obtain the accurate answer of bubbling film statical equilibrium problem, to overcome the weak point of existing measuring technology, the present invention adopts a band to have or not the right cylinder of the flat any radius of friction as loading axle, realizes the layering of film/base.As shown in Figure 1, in the basic unit of film/basic unit system, open the aperture that a radius that runs through basic unit is d, to adopt a radius be b without the flat right cylinder of friction as loading axle, by the aperture in basic unit to coating film imposed load F, making thickness is that h, elastic modulus are that the coating film that E, Poisson ratio are ν departs from basic unit, and form the stable bubbling that a radius is a, wherein b<d.In loading procedure, because the film of axle/film contact portion is all the time in planar stretch state, therefore, axle/film contact portion is actually the planar stretch problem on deformation of a film, and the problem on deformation of residue film, be actually the problem on deformation of an annular membrane, like this, the problem on deformation of whole bubbling film is easily resolved processing just.

Utilize the bubbling deflection metrology value w of this stable bubbling at radius r=b place _b, and remember α=b/a, and accurately answer the statical equilibrium problem of this bubbling film, easily obtain:

If 1.

4=(1+ν)(3-α ²),

The adhesion between film and basic unit is

$F_G=\frac{\mathrm{Eh}}{2a^3{\&lsqb;{(3-{\mathrm{\&alpha;}}^2)}^{1/3}-{\left(2{\mathrm{\&alpha;}}^2\right)}^{1/3}\&rsqb;}^3}{w}_b^3$

Wherein π is circular constant;

If 2.

(1+ν)(3-α ²)<4

The adhesion between film and basic unit is

Wherein, π is circular constant,

with

value by formula

With

Determine;

If 3.

(1+ν)(3-α ²)>4

The adhesion between film and basic unit is

Wherein, π is circular constant,

with

value by formula

With

Determine.

Accompanying drawing explanation

Fig. 1 is that flat right cylinder loads bubble test organigram, in Fig. 1, coating film in 1-film/matrix system, 2-bubbling film (coating film after distortion), basic unit in 3-film/matrix system, 4-loads axle (band has or not the flat right cylinder of friction), symbol is wherein, a represents the radius of bubbling, b represents to load the radius of axle, and d represents the radius of aperture in basic unit, and r represents radial coordinate, w represents that (wherein w (r) represents the lateral coordinates at r place, w to lateral coordinates _brepresent the lateral coordinates at r=b place), F represents to be applied to the external force loading on axle.

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

As shown in Figure 1, prepare the test sample (being formed by " 1 " in Fig. 1 and " 3 ") of film/basic unit system, adopt the way of brill or chemical etching, in the basic unit of film/matrix system, open the aperture that a radius is d, aperture runs through basic unit until the contact interface of coating film (in Fig. 1 " 1 ") and basic unit (in Fig. 1 " 3 ") has so just been made into a test needed " detected sample ".To adopt a band to have or not the flat radius of friction be b right cylinder is as loading axle (in Fig. 1 " 4 "), wherein b<d.By the aperture in basic unit, utilize and load axle to coating film imposed load F, making thickness is that h, elastic modulus are that the coating film that E, Poisson ratio are ν departs from basic unit, and form the stable bubbling that a radius is a (dimensionally stable of bubbling), before loading, smear talcum powder loading on axle flat, to reduce the friction between film/base.Accurately measure the deflection value w of this stable bubbling at radius r=b place _bthen shed load F, whether the film of observing after unloading can return to the shape before loading completely, if the film after unloading can not recover distortion completely, the payload values F that explanation applies is excessive, film enters plastic yield, and this test data is invalid, needs to make in addition test sample and tests.The film after unloading suitably reduces applied payload values F, until can recover distortion, measured bubbling deflection value w completely _bfor effective value, can be for the adhesion F between film and basic unit _gcalculating.Note α=b/a, so the adhesion F between film and basic unit _gcalculating carry out according to following steps:

If 1.

4=(1+ν)(3-α ²),

The adhesion between film and basic unit is

$F_G=\frac{\mathrm{Eh}}{2a^3{\&lsqb;{(3-{\mathrm{\&alpha;}}^2)}^{1/3}-{\left(2{\mathrm{\&alpha;}}^2\right)}^{1/3}\&rsqb;}^3}{w}_b^3$

Wherein π is circular constant;

If 2.

(1+ν)(3-α ²)<4

The adhesion between film and basic unit is

Wherein, π is circular constant,

with

the value of (unit is radian) is by formula

With

Determine;

If 3.

(1+ν)(3-α ²)>4

The adhesion between film and basic unit is

Wherein, π is circular constant,

with

value by formula

With

Determine.

All parameters all adopt International System of Units.

Claims (1)

1. between a film and basic unit, the flat right cylinder of adhesion adds load measuring method, it is characterized in that: in the basic unit of film/base layer structure, open the aperture that a radius that runs through basic unit is d, be b with a radius without the flat right cylinder of friction as loading axle, by the aperture in basic unit to coating film imposed load F, making thickness is that h, elastic modulus are that the coating film that E, Poisson ratio are ν departs from basic unit, and form the stable bubbling that a radius is a, wherein b<d, accurately measures the deflection value w of this stable bubbling at radius r=b place _b, and remember α=b/a, the statical equilibrium analysis based on this stable bubbling so, the adhesion F between film and basic unit _g, can carry out calculative determination according to following three kinds of situations:

If situation 1.

4=(1+ν)(3-α ²),

The adhesion between film and basic unit is

$F_G=\frac{\mathrm{Eh}}{2a^3{\&lsqb;{(3-{\mathrm{\&alpha;}}^2)}^{1/3}-{\left(2{\mathrm{\&alpha;}}^2\right)}^{1/3}\&rsqb;}^3}{w}_b^3$

Wherein π is circular constant;

If situation 2.

(1+ν)(3-α ²)<4

The adhesion between film and basic unit is

Wherein, π is circular constant,

with

value by formula

With

Determine;

If situation 3.

(1+ν)(3-α ²)>4

The adhesion between film and basic unit is

Wherein, π is circular constant, with

value by formula

With

Determine.