CN105486632A - Measuring method for bonding strength of metallic composite, sample and sample manufacturing method - Google Patents
Measuring method for bonding strength of metallic composite, sample and sample manufacturing method Download PDFInfo
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- CN105486632A CN105486632A CN201511004869.4A CN201511004869A CN105486632A CN 105486632 A CN105486632 A CN 105486632A CN 201511004869 A CN201511004869 A CN 201511004869A CN 105486632 A CN105486632 A CN 105486632A
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- sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- 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
Abstract
The invention provides a measuring method for bonding strength of a metallic composite, a sample and a sample manufacturing method. The measuring method comprises the following steps: A) cutting out a disc sample from the metallic composite for standby application, preparing or selecting two metal bars with diameters of sections equal to the diameter of the disc sample for standby application; B) polishing the to-be-pasted surfaces of the sample and the metal bars; C) respectively bonding the to-be-pasted surfaces of the two metal bars on the two to-be-pasted surfaces of the disc sample; D) cutting an annular notch between a base layer and a coating layer interface while ensuring that the notch center line is on the interface; E) putting the sample onto a stretching device for performing tensile test; F) acquiring the value F of maximum tensile strength when the sample is stretched, and calculating the bonding strength of the sample according to F/Pir2, wherein F represents the maximum tensile strength when the sample is stretched, and r represents the radius of the disc sample on the interface. The measuring sample and method provided by the invention can be used for effectively measuring the bonding strength of the metallic composite.
Description
Technical field
The present invention relates generally to the detection technique field of metallic composite interface bond strength, particularly relates to the detection technique field of aluminum steel composite material interface bond strength.
Background technology
Thin aluminium lamination aluminum steel composite band material has the plurality of advantages such as the good mechanical property of the excellent decay resistance of aluminium alloy and heat conductivility and steel concurrently, is the main raw material(s) of cooling tube bundle base tube in power station air cooling system core parts.The power station air cooling system adopting aluminum steel composite band material to manufacture replaces water-cooling system, can using water wisely more than 75%.Based on the considering of the aspect such as stability and production efficiency of aluminum steel composite band material surface quality, dimensional accuracy, performance, the cold rolling composite algorithm of current industrial most employing produces aluminum steel composite material, its finished product thickness is between 1.4 ~ 1.6mm, and clad aluminum layer thickness is between 0.05 ~ 0.09mm.Aluminum steel interface quality determines the forming property of base tube and the serviceable life of power station air cooling system, therefore effectively, quantitatively, accurate evaluation interface bond strength for the cold rolling complex controll of this kind of material and practical application all extremely important.
The aluminium lamination of power station air cooling aluminum steel laminar composite is very thin (thickness is 0.05 ~ 0.09mm), cannot by conventional shearing, the mechanics means such as to tear off interface bond strength evaluated, due to leader part cannot be produced, the interface bond strength of quantitative measurment aluminum steel composite material also cannot be tested by stretch release.Measurement at present to thin cladding compound substance bond strength, the national standard of the U.S., Japan and China all adopts the method for gluing stretching, and it has feature flexibly simple to operate, and does not need the theory calculate of complexity.But the epoxy resin adhesive the highest due to current intensity is difficult to more than 40MPa with the bond strength of bonding leader, and the drafts of cold rolling aluminum steel composite material single pass is more than 50%, the intensity of interface cohesion is greater than 50MPa, bond strength after annealing is more than 60MPa, range of application due to this method is subject to the restriction of the tensile strength of bonding agent used (glue), therefore cannot be evaluated the interface bond strength of aluminum steel composite material by conventional bonding stretching.
Summary of the invention
For above produced problem, the invention provides a kind of measuring method of metallic composite bond strength and measure sample, effectively can measure the bond strength of metallic composite.
The invention provides a kind of measuring method of metallic composite bond strength, comprise the following steps:
S1: preparation measurement sample:
A, on the compound substance containing basic unit and clad, cut out a wafer sample for subsequent use, makes or choose the metal bar that two cross-sectional diameters equal wafer sample diameter stand-by;
C, the surface to be pasted of two metal bars is bonded in wafer sample two surfaces to be pasted respectively;
D, between basic unit and clad interface, cut out an annular incision, cut angle scope is 15 ° ~ 90 °, and ensures that open center line drops on interface;
S2: carry out tension test:
E, sample put to drawing machine, does tension test;
S3: calculations incorporated intensity:
The numerical value F of maximum stretching force when F, acquisition sample stretch, according to F/ π r
2calculate the bond strength of sample,
Wherein, F represents maximum stretching force when sample stretches, and r represents the interface radius of wafer sample.
The measuring method of metallic composite bond strength as above, wherein, described metallic composite is aluminum steel composite material, and wherein steel is basic unit, and aluminium is clad.
The measuring method of metallic composite bond strength as above, wherein, before described step C, also comprises step:
B, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
Present invention also offers a kind of measurement sample for measuring metallic composite bond strength, comprise circular print and two metal bars of the compound substance containing basic unit and clad, wherein, the diameter of described two metal bars equals described circular print diameter, one end of described two metal bars is pasted onto on the circular surface of the both sides of circular print respectively, there is between the basic unit of described circular print and composite bed interface an annular incision, cut angle is 15 ° ~ 90 °, and ensures that open center line drops on interface.
As above for measuring the measurement sample of metallic composite bond strength, wherein, described compound substance is aluminum steel composite material, and wherein steel is basic unit, and aluminium is clad.
As above for measuring the measurement sample of metallic composite bond strength, wherein, before on the circular surface that one end of described two metal bars is pasted onto the both sides of circular print respectively, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
Present invention also offers a kind of method for making of the measurement sample for measuring metallic composite bond strength, comprising the following steps:
A, on the compound substance containing basic unit and clad, cut out a wafer sample for subsequent use, makes or choose the metal bar that two cross-sectional diameters equal wafer sample diameter stand-by;
C, the surface to be pasted of two metal bars is bonded in wafer sample two surfaces to be pasted respectively;
D, between basic unit and clad interface, cut out an annular incision, cut angle is 15 ° ~ 90 °, and ensures that open center line drops on interface.
As above for measuring the method for making of the measurement sample of metallic composite bond strength, wherein, before described step C, also comprise step:
B, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
As above for measuring the method for making of the measurement sample of metallic composite bond strength, wherein, described metallic composite is aluminum steel composite material, and wherein steel is basic unit, and aluminium is clad.
Measure sample and measuring method in the application of the invention, the problem by adhesive strength restriction in general measuring method can be broken away from, effectively can measure the bond strength of metallic composite.
Accompanying drawing explanation
By detailed description done in conjunction with the following drawings, above-mentioned or otherwise advantage of the present invention will become clearer and be easier to understand, and these accompanying drawings just schematically, do not form restriction of the present invention, wherein:
Fig. 1 be measure in the embodiment of the present invention sample and metal bar bond after, stretch before structural representation;
Fig. 2 be measure in the embodiment of the present invention sample and metal bar bond after, stretch before another kind of structural representation;
Fig. 3 be measure in the embodiment of the present invention sample and metal bar bond after, stretch before another kind of structural representation;
Fig. 4 is the structural representation measuring wafer sample in sample in the embodiment of the present invention.
In figure, each label is expressed as follows:
1: aluminium bar;
2: aluminium lamination;
3: steel layer;
4: cementing agent.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
The embodiment recorded at this is specific embodiment of the present invention, for illustration of design of the present invention, is all explanatory and exemplary, should not be construed as the restriction to embodiment of the present invention and the scope of the invention.Except the embodiment recorded at this; those skilled in the art can also adopt other technical scheme apparent based on the content disclosed in the application's claims and instructions; these technical schemes comprise the technical scheme making any apparent substitutions and modifications adopted the embodiment recorded at this, all within protection scope of the present invention.
The accompanying drawing of this instructions is schematic diagram, the shape of aid illustration design of the present invention, each several part and mutual relationship thereof.Note that the structure of each parts for the ease of clearly showing the embodiment of the present invention, not according to identical scale between each accompanying drawing, identical reference marker is for representing identical part.
A measuring method for metallic composite bond strength, comprises the following steps:
A, on the compound substance containing basic unit and clad, cut out a wafer sample for subsequent use, makes or choose the metal bar that two cross-sectional diameters equal wafer sample diameter stand-by.
Concrete, it is r wafer sample to be checked that Linear cut mode can be adopted to cut out radius from metal composite layer, also can adopt other cutting modes, ensures wafer sample profile rule.
Further, described stand-by metal bar can be aluminium bar, copper rod or other material metal bars.Preferably, choose alumina based material metal bar, this aluminium bar length should be 30 ~ 70mm, facilitates sample to carry out clamping and stretching experiment.
B, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
Can clean the surface to be pasted of wafer sample and aluminium bar before polishing in advance, object is to remove surface and oil contaminant to be pasted and oxide layer, and the circular flat of wafer sample both sides, a circular end face of aluminium bar are surface to be pasted.
Further, in order to obtain better surface quality, can by the surface to be pasted of following means cleaning wafer sample and aluminium bar: utilize the surface each to be pasted on hydrochloric acid cleaning wafer sample and aluminium bar, then with the surface each to be pasted of degreasing agent successively wiping wafer sample and aluminium bar.Wherein, degreasing agent is generally acetone and alcohol, because residue can be contained in cleaned surface to be pasted, therefore must treat adhesive surface and polish, normally after each surface to be pasted is air-dry, the to be pasted surface of 500# sand paper to wafer sample and aluminium bar is adopted to carry out sand papering process.
C, the surface to be pasted of two metal bars to be bonded on wafer sample two surfaces to be pasted respectively.
Concrete, the aluminium bar cross-sectional diameter chosen and the equal diameters of wafer sample, during stickup, should make aluminium bar end face overlap completely with the band sticking veneer of wafer sample.
Further, the optional extracting epoxy resin cementing agent of described cementing agent.It is bonding that epoxy resin is applicable between metal with metal, as iron sheet, galvanized sheet, aluminium foil, Copper Foil, aluminium sheet, cold drawing and other metal coiled materials.And the intensity through between epoxy-bonded goods can reach 40Mpa, the interface bond strength of the strength ratio aluminum steel composite material through between epoxy-bonded goods is large.After wafer sample and metal bar bond, be placed on lower more than 24 hours of normal temperature 25 DEG C of states, solidify completely to make bonding agent; And the bonding strength setting bonding agent and metal is σ (a).
D, between basic unit and clad interface, cut out an annular incision, and ensure that open center line drops on interface.
Concrete, as shown in Figure 4, Fig. 4 is the structural representation measuring wafer sample in sample in the embodiment of the present invention.For ensureing its cutting accuracy, precision optical machinery can be selected to process and excise, otch front end radius-of-curvature is r=0.1mm, and interfacial area is set to A.After excision, should ensure that the vertical center line line at interface and stretching axis keep overlapping.
Further, and kerf can be polytype, and can be an annular wedge-formed incision, its cut angle scope be 15 ° ~ 90 °, as shown in Figure 1; Or be processed into an annular groove shaped, as shown in Figure 2; And for the thicker aluminum steel composite material of composite bed thickness, when ensureing that the intensity of aluminium is greater than interface bond strength, can the centre position of Pocket Machining at aluminum steel interface, as shown in Figure 3.
E, sample put to drawing machine, does tension test.
Concrete, the chuck of drawing machine is clipped in one end away from circular disc test specimen of two aluminium bars respectively, and the chuck on restrained stretching machine moves outside two.Chuck translational speed is 2mm/min-10mm/min (mm/min), thus uses the steel disc on wafer sample to be separated with aluminium flake.
Further, described drawing machine can choice for use electronic universal tester, the test of the mechanical property such as electronic universal tester is applicable to stretch to materials such as metal, rubber, plastics, aluminium-plastic pipe, compound substance, waterproof material, yarn fabric, yarn, fiber, electric wire, paper, spring, timber, wrappage, adhesive tapes, compress, bend, shear, tear, stripping.
The numerical value F of maximum stretching force when F, acquisition sample stretch, according to F/ π r
2calculate the bond strength of sample.
Wherein, numerical value F represents maximum stretching force when sample stretches, and r represents the interface radius of wafer sample.
In order to better determine the bond strength of aluminum steel composite material, multiple wafer sample can also be cut on metallic composite simultaneously, repeat steps A-F, calculate the mean value of each wafer sample bond strength, this mean value is the interface bond strength of metallic composite.
As long as the present invention ensures metal combination interface area A < σ (a) π R when processing sample
2/ σ (i), for σ (i) aluminum steel composite material at 60MPa ~ 70MPa, and adhesive strength is between 30MPa ~ 40MPa, as long as therefore ensure when processing sample
just can guarantee the stretching bond strength obtaining aluminum steel interface.
embodiment
The bonding tensile sample that the present invention uses is aluminum steel composite material, and 4A60 aluminium/08Al steel composite material total thickness is 1.5mm, wherein aluminium lamination 4A60 thickness 0.08mm, and steel layer 08Al thickness 1.49mm, aluminum layer thickness is much smaller than steel layer thickness.
The bonding concrete operations of processing with sample of described metal bar are:
(1) utilize Linear cut mode to process wafer sample on aluminum steel composite material layer, the diameter of its wafer sample is 10mm, and makes two cross-sectional diameters aluminium bar identical with the diameter of wafer sample, and its length chooses 30mm.
(2) sand papering process is carried out on surface to be pasted.
First with the surface each to be pasted on wafer sample on hydrochloric acid cleaning and aluminium bar, then with the surface each to be pasted of acetone successively wiping wafer sample and aluminium bar, remove the surface and oil contaminant of sample, after each surface to be pasted is air-dry, adopt the to be pasted surface of 500# sand paper to wafer sample and aluminium bar to carry out sand papering process, make sample surfaces roughness reach 2 μm.
(3) use epoxy resin adhesive to be bonded in respectively on wafer sample two surfaces to be pasted on the surface to be pasted of two aluminium bars, and place more than 24 hours under normal temperature, to make bonding agent solidify completely, surface to be pasted during stickup, should be made to overlap completely.
(4) cut out by being machined in aluminium lamination and steel body interface annular incision that an angle is about 26 °, notch depth is 2mm, otch front end radius-of-curvature is r=0.1mm, and ensure that open center line drops on interface, vertical center line and the stretching axis of circular arc interface are consistent, its interfacial area is A, interfacial area A=3.14 × (5-2)
2=28.26mm
2.
(5) with CMT7540 electronic universal tester, two of aluminium bar free ends are clamped, apply constant speed 5mm/min.And the force-displacement curve recorded in drawing process, measure the maximum pull that aluminum steel layer occurs when stretching and be about F1896N, calculating aluminum steel composite material interface bond strength by the radiometer of maximum, force and interfacial area is σ (i)=1896N/28.26mm
2=67MPa.Now, the tension that cementing agent face is born is σ (a)=F/S, herein S=3.14 × 52mm
2=78.5mm
2, σ (a)=1896/78.5MPa=25MPa, the tension in its cementing agent face is less than the critical intensity of epoxy adhesive, therefore bonding interface can not rupture.
Make two cross-sectional diameters aluminium bar identical with the diameter of wafer sample in addition, its length chooses 70mm, and utilize said method to make measurement sample, sample size incision is same as the previously described embodiments.Carry out tension test to the sample prepared, its test findings is consistent with above-described embodiment result.
Make two cross-sectional diameters aluminium bar identical with the diameter of wafer sample in addition, its length chooses 50mm, and utilize said method to make measurement sample, sample size incision is same as the previously described embodiments.Carry out tension test to the sample prepared, its test findings is consistent with above-described embodiment result.
Therefore, utilize the measuring method proposed in the present invention and measure the bond strength that sample effectively can measure aluminum steel composite material.
The invention allows for a kind of measurement sample for measuring metallic composite bond strength, comprise circular print and two metal bars of the compound substance containing basic unit and clad, it is characterized in that, the diameter of described two metal bars equals described circular print diameter, one end of described two metal bars is pasted onto on the circular surface of the both sides of circular print respectively, there is between the basic unit of described circular print and composite bed interface an annular incision, cut angle is 15 ° ~ 90 °, and ensures that open center line drops on interface.
Further, described compound substance is aluminum steel composite material, and wherein steel is basic unit, and aluminium is clad.
Further, before on the circular surface that one end of described two metal bars is pasted onto the both sides of circular print respectively, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
The invention allows for a kind of method for making of the measurement sample for measuring metallic composite bond strength, comprising the following steps:
A, on the compound substance containing basic unit and clad, cut out a wafer sample for subsequent use, makes or choose the metal bar that two cross-sectional diameters equal wafer sample diameter stand-by.
Concrete, it is r wafer sample to be checked that Linear cut mode can be adopted to cut out radius from aluminum steel composite material layer, also can adopt other cutting modes, ensures wafer sample profile rule.
Further, described stand-by metal bar can be aluminium bar, copper rod or other material metal bars, preferably, chooses alumina based material metal bar, and this aluminium bar length should be 30 ~ 70mm, facilitates sample to carry out clamping and stretching experiment.
B, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
Can clean the surface to be pasted of wafer sample and aluminium bar before polishing in advance, object is to remove surface and oil contaminant to be pasted and oxide layer, and the circular flat of wafer sample both sides, a circular end face of aluminium bar are surface to be pasted.
Further, in order to obtain better surface quality, can by the surface to be pasted of following means cleaning wafer sample and aluminium bar: before polishing, utilize the surface each to be pasted on hydrochloric acid cleaning wafer sample and aluminium bar, then with the surface each to be pasted of degreasing agent successively wiping wafer sample and aluminium bar.Wherein, degreasing agent is generally acetone and alcohol, because cleaned surface to be pasted has residue, therefore must treat adhesive surface and polish, normally after each surface to be pasted is air-dry, the to be pasted surface of 500# sand paper to wafer sample and aluminium bar is adopted to carry out sand papering process.
C, the surface to be pasted of two metal bars is bonded in wafer sample two surfaces to be pasted respectively.
Concrete, the aluminium bar cross-sectional diameter chosen and the equal diameters of wafer sample, during stickup, should make aluminium bar end face overlap completely with the band sticking veneer of wafer sample.
Further, the optional extracting epoxy resin cementing agent of described cementing agent.Epoxy resin is applicable to the compound between metal and metal, as iron sheet, galvanized sheet, aluminium foil, Copper Foil, aluminium sheet, cold drawing and other metal coiled materials.And the peel strength through between epoxy-bonded goods can reach 40Mpa, the peel strength through between epoxy-bonded goods is larger than the interface bond strength of aluminum steel composite material.After wafer sample and metal bar bond, be placed on lower more than 24 hours of normal temperature 25 DEG C of states, solidify completely to make bonding agent.
D, between basic unit and clad interface, cut out an annular incision, cut angle is 15 ° ~ 90 °, and ensures that open center line drops on interface.
Concrete, for ensureing its cutting accuracy, precision optical machinery can be selected to process and excise, otch front end radius-of-curvature is r=0.1mm, and interfacial area is set to A, after excision, should ensure that the vertical center line line at interface and stretching axis keep overlapping.
Further, and kerf can be polytype, and can be an annular wedge-formed incision, its cut angle scope be 15 ° ~ 90 °, as shown in Figure 1; Or be processed into groove shapes, as shown in Figure 2; And for the thicker aluminum steel composite material of composite bed thickness, when ensureing that the intensity of aluminium is greater than interface bond strength, can the centre position of Pocket Machining at aluminum steel interface, as shown in Figure 3.
When needing the bond strength measuring aluminum steel composite material, only need choose corresponding measurement sample and carrying out stretching experiment.
Each technical characteristic of above-mentioned disclosure is not limited to that disclosed with combination that is other features, other combinations that those skilled in the art also can carry out between each technical characteristic according to the object of invention, is as the criterion with the object realizing the present invention.
Claims (9)
1. a measuring method for metallic composite bond strength, comprises the following steps:
S1: preparation measurement sample:
A, on the compound substance containing basic unit and clad, cut out a wafer sample for subsequent use, makes or choose the metal bar that two cross-sectional diameters equal wafer sample diameter stand-by;
C, the surface to be pasted of two metal bars is bonded in wafer sample two surfaces to be pasted respectively;
D, between basic unit and clad interface, cut out an annular incision, cut angle is 15 ° ~ 90 °, and ensures that open center line drops on interface;
S2: carry out tension test:
E, sample put to drawing machine, does tension test;
S3: calculations incorporated intensity:
The numerical value F of maximum stretching force when F, acquisition sample stretch, according to F/ π r
2calculate the bond strength of sample,
Wherein, F represents maximum stretching force when sample stretches, and r represents the interface radius of wafer sample.
2. the measuring method of metallic composite bond strength according to claim 1, is characterized in that, described metallic composite is aluminum steel composite material, and wherein steel is basic unit, and aluminium is clad.
3. the measuring method of metallic composite bond strength according to claim 1, is characterized in that, before described step C, also comprises step:
B, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
4. one kind for measuring the measurement sample of metallic composite bond strength, comprise circular print and two metal bars of the compound substance containing basic unit and clad, it is characterized in that, the diameter of described two metal bars equals described circular print diameter, one end of described two metal bars is pasted onto on the circular surface of the both sides of circular print respectively, there is between the basic unit of described circular print and composite bed interface an annular incision, cut angle is 15 ° ~ 90 °, and ensures that open center line drops on interface.
5. the measurement sample for measuring metallic composite bond strength according to claim 4, is characterized in that, described compound substance is aluminum steel composite material, and wherein steel is basic unit, and aluminium is clad.
6. the measurement sample for measuring metallic composite bond strength according to claim 4, it is characterized in that, before on the circular surface that one end of described two metal bars is pasted onto the both sides of circular print respectively, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
7., for measuring a method for making for the measurement sample of metallic composite bond strength, comprise the following steps:
A, on the compound substance containing basic unit and clad, cut out a wafer sample for subsequent use, makes or choose the metal bar that two cross-sectional diameters equal wafer sample diameter stand-by;
C, the surface to be pasted of two metal bars is bonded in wafer sample two surfaces to be pasted respectively;
D, between basic unit and clad interface, cut out an annular incision, cut angle is 15 ° ~ 90 °, and ensures that open center line drops on interface.
8. the method for making of the measurement sample for measuring metallic composite bond strength according to claim 7, is characterized in that, before described step C, also comprise step:
B, grinding process is carried out to the surface to be pasted of wafer sample and metal bar.
9. the method for making of the measurement sample for measuring metallic composite bond strength according to claim 7, is characterized in that, described metallic composite is aluminum steel composite material, and wherein steel is basic unit, and aluminium is clad.
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| CN113776934A (en) * | 2021-08-05 | 2021-12-10 | 长江存储科技有限责任公司 | Method for measuring bonding strength and sample |
| CN114354336A (en) * | 2021-12-03 | 2022-04-15 | 南方电网科学研究院有限责任公司 | Measurement sample and measurement method for tensile strength of epoxy composite material and aluminum interface |
| CN117629715A (en) * | 2024-01-25 | 2024-03-01 | 江苏省沙钢钢铁研究院有限公司 | Method for cutting steel sheet sample |
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