CN108931424B - Testing device and evaluation method for bonding strength of ultrathin laminar metal composite material - Google Patents
Testing device and evaluation method for bonding strength of ultrathin laminar metal composite material Download PDFInfo
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- CN108931424B CN108931424B CN201810518083.1A CN201810518083A CN108931424B CN 108931424 B CN108931424 B CN 108931424B CN 201810518083 A CN201810518083 A CN 201810518083A CN 108931424 B CN108931424 B CN 108931424B
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention relates to a testing device and an evaluation method for bonding strength of an ultrathin metal layered composite material. The device consists of an upper punch and a lower die holder; the upper die punch is provided with a convex part; the lower die base is provided with a groove; and assembling the upper die with the convex part facing downwards and the lower die base with the groove facing upwards, wherein the convex part on the upper die enters the groove on the lower die. The application is as follows: coating glue on one surface of the layered metal composite material, and sticking the surface with the glue on a lower punch; at the moment, one symmetrical shaft in the layered metal composite material falls on a groove on the lower die punch; obtaining a sample to be heated; the sample to be heated is subjected to low-temperature gluing treatment; fixing the upper punch on a pressure experiment machine; and moving downwards to enable the convex part of the upper punch to be just compressed against the groove of the lower die holder, and completing the test. The device is reasonable, the testing method is simple, and the carrying and the application are convenient. Meanwhile, the invention can also be used in some special environments.
Description
Technical Field
The invention belongs to the field of performance evaluation of layered composite materials, and particularly relates to a testing device and an evaluation method for bonding strength of an ultrathin metal layered composite material.
Background
The layered metal composite material is a novel material obtained by utilizing a composite technology to realize firm metallurgical bonding between two or more metals with different physical, chemical and mechanical properties. The metal of each layer still keeps the respective original characteristics, but the overall physical, chemical and mechanical properties of the metal are greatly improved compared with those of single metal, and the metal is widely applied to the fields of aerospace, mechanical manufacturing and the like. The main methods for preparing the layered metal composite material include a hot rolling method, a diffusion welding method, a coating method, a laser cladding method and the like. The interface structure of the layered metal composite material generally consists of a diffusion layer, a reaction layer and the like.
The bonding strength between the layers is one of the important indicators for measuring the quality of the laminated composite material. At present, methods for evaluating the bonding strength of the laminated composite material mainly comprise a stretching method and a shearing method. The bonding strength of the layered composite material was evaluated by measuring the tensile strength or shear strength of the layered composite material by stretching or shearing. However, for the ultrathin layered metal composite material, the thickness direction size of the ultrathin layered metal composite material does not meet the requirement of preparing a tensile or shear test sample. Therefore, the bonding strength between the layers of the layered metal composite material cannot be evaluated by the conventional test method, and it is urgently needed to find a bonding strength evaluation method for the ultrathin layered metal composite material. In particular to a method for testing the interface bonding strength of the ultrathin layered metal composite material prepared by a die pressing mode.
Disclosure of Invention
The invention aims to provide a device for testing the bonding strength of an ultrathin layered metal composite material and an evaluation method thereof. The device has a simple structure, makes up the defect that the existing test method can not evaluate the bonding strength of the ultrathin layered metal composite material, and can evaluate the bonding strength of the metal layered composite material.
The invention relates to a device for testing the bonding strength of an ultrathin layered metal composite material, which consists of an upper punch and a lower die holder; the upper die punch is provided with a convex part; the lower die base is provided with a groove; and assembling the upper die with the convex part facing downwards and the lower die holder with the groove facing upwards, wherein the convex part on the upper die enters the groove on the lower die holder.
According to the device for testing the bonding strength of the ultrathin layered metal composite material, the width of the groove in the lower die holder is 5-10mm, and preferably 6-8 mm; the groove depth is 1 to 2 times, preferably 1.2 to 1.5 times, the groove width.
According to the device for testing the bonding strength of the ultrathin layered metal composite material, the upper edge of the groove in the lower die holder is arc-shaped; the radius of the arc is 1-2mm, and the central angle is 30-90 degrees. When the arc is formed, the width of the groove formed in the lower die base refers to the shortest distance between two parallel upper edges of the groove. The distance is greater than or equal to the shortest vertical distance between two walls on the same plane on the groove.
The invention relates to a device for testing the bonding strength of an ultrathin metal composite material, wherein the height of a bulge on an upper punch is 0.8-1 time of the depth of a groove.
Preferably, the upper die is punched, and the top of the convex part is arc-shaped; the radius of the arc is 2-3mm, and the central angle is 120-180 degrees.
Preferably, the width of the convex part of the upper die punch is 0.5-0.8 time of the width of the groove of the lower die holder; preferably 0.7 to 0.8 times.
The invention relates to the application of a device for testing the bonding strength of an ultrathin layered metal composite material; comprises the following steps;
step one
Taking an ultrathin layered metal composite material, and cutting the ultrathin layered metal composite material into a round shape; the ultrathin layered metal composite material is composed of n layers of metal layers, and the densities of at least 2 layers of the n layers of metal layers are different; the thickness of the ultrathin layered metal composite material is less than 5 mm;
step two
Coating E7 glue on one surface of the layered metal composite material, and sticking the surface with the E7 glue on a lower die base; at the moment, one symmetrical shaft in the layered metal composite material falls on a groove on the lower die base; obtaining a sample to be heated;
step three
Heating the sample obtained in the step two to 60-80 ℃, applying a pressure of 3-10KPa, and keeping the temperature and the pressure for 4-6 hours; cooling; obtaining a sample to be tested;
step four
Fixing the upper punch on a pressure experiment machine; the upper die punch is moved downwards so that the convex part of the upper die punch is just opposite to the groove of the lower die holder to be compressed; the displacement and load of the upper die at this time; and when the layered material is tilted and completely separated, the pressure testing machine stops working.
Step five
Drawing the displacement and the load recorded in the fourth step into a displacement-load curve, and searching for the load and a corresponding displacement value when the displacement-load curve fluctuates to serve as an evaluation index of the interface bonding strength of the layered metal composite material; the point of fluctuation indicates that the layered material cracks and will rise slowly at the moment of loading.
The invention relates to the application of a device for testing the bonding strength of an ultrathin layered metal composite material; in the first step, the ultrathin layered metal composite material is taken and processed into a round sample with the diameter of 30 mm.
The invention relates to the application of a device for testing the bonding strength of an ultrathin layered metal composite material; the ultrathin layered metal composite material is prepared in a hot-pressing diffusion mode. The ultrathin layered metal composite material is preferably an Al/Mg layered composite material.
The invention relates to the application of a device for testing the bonding strength of an ultrathin layered metal composite material; and any one of the n metal layers is less than 2mm thick. The total thickness is less than or equal to 10 mm.
The invention relates to the application of a device for testing the bonding strength of an ultrathin layered metal composite material; the bonding strength of the glue is greater than the bonding strength of the ultrathin layered metal composite material.
The invention relates to a device for testing the bonding strength of an ultrathin layered metal composite material and application thereof, which can well research the change condition of mechanical properties of the ultrathin layered metal composite material in the process from cracking at the beginning to complete cracking at the end.
The invention has the beneficial effects that:
the method for evaluating the bonding strength of the ultrathin layered metal composite material overcomes the defect that the conventional test method cannot evaluate the bonding strength of the ultrathin layered metal composite material. The deformation of different materials in the compression process is different, and the layered material is cracked by applying simple one-way pressure, so that the interface bonding strength of the layered material is qualitatively evaluated.
Drawings
FIG. 1 is a schematic diagram and dimensions of an upper punch designed according to the present invention.
FIG. 2 is a schematic view and dimensions of a lower die holder designed according to the present invention.
FIG. 3 is a schematic diagram of the lower die base designed according to the present invention after a sample to be tested is adhered thereon;
FIG. 4 is a schematic diagram showing the relative positions of an upper punch and a lower die holder to which a sample to be tested is adhered according to the present invention;
FIG. 5 is a schematic diagram showing the completion of the test of the lower die base to be adhered with a sample to be tested;
FIG. 6 is a load-displacement graph of an example AlMg layered metal composite.
Detailed Description
The following describes in detail preferred embodiments of the present invention.
Example 1
The invention relates to a device for testing the bonding strength of an ultrathin layered metal composite material,
the width of the groove on the lower die base is 7 mm; the groove depth is 10 mm.
The radius of the arc of the upper edge of the groove of the lower die base is 1mm, and the central angle is 90 degrees.
The height of the projection of the projecting portion on the upper punch was 9mm, and the width was 5 mm.
Punching an upper die, wherein the top of the convex part is arc-shaped; the radius of the arc is 2.5mm, and the central angle degree is 180 degrees. The specific dimensions of the test device are shown in fig. 1 and 2.
An evaluation method of bonding strength of an ultrathin laminar metal composite material comprises the following specific steps:
(1) the Al/Mg laminated composite material is prepared by adopting a hot-pressing diffusion mode, and the thicknesses of Al and Mg are respectively 0.5mm and 0.8 mm. A sample with a diameter of 30mm was obtained from the prepared Al/Mg layered composite material by wire cut electrical discharge machining, and used as a test sample in this example.
(2) E7 glue is coated on the Mg surface, E7 glue is coated on one surface of the layered metal composite material, and the Mg surface with the E7 glue is stuck on the lower die base; at the moment, one symmetry axis in the layered metal composite material falls on the groove of the lower die base to obtain a sample to be heated.
(3) Heating the sample to 60 ℃, applying 5KPa pressure, and keeping the temperature and pressure for 6 hours; cooling; obtaining a sample to be tested;
(4) fixing the upper punch on a pressure experiment machine; moving downwards to enable the convex part of the upper punch to be opposite to the groove of the lower die holder, and compressing the sample to be tested by using a universal testing machine; at the moment, the testing machine automatically records the displacement and the load of the upper punching die; and when the layered material is tilted and completely separated, the pressure testing machine stops working.
(5) Drawing the displacement and the load recorded in the fourth step into a displacement-load curve, and searching for the load and a corresponding displacement value when the displacement-load curve fluctuates to serve as an evaluation index of the interface bonding strength of the layered metal composite material; the point of fluctuation indicates that the layered material cracks.
Claims (5)
1. The application of the testing device for the bonding strength of the ultrathin layered metal composite material is characterized in that: the device consists of an upper punch and a lower die holder; the upper die punch is provided with a convex part; the lower die base is provided with a groove; assembling the upper punch with the convex part facing downwards and the lower die holder with the groove facing upwards, and making the convex part of the upper punch enter the groove of the lower die holder; the width of the groove on the lower die base is 5-10 mm; the groove depth is 1-2 times of the groove width;
the height of the convex part on the upper punch is 0.8-1 time of the depth of the groove on the lower die holder; punching an upper die, wherein the top of the convex part is arc-shaped; the radius of the arc is 2-3mm, and the central angle is 120-180 degrees; the width of the convex part of the upper die punch is 0.5-0.8 time of the width of the groove of the lower die holder;
the application comprises the following steps;
step one
Taking an ultrathin layered metal composite material, and cutting the ultrathin layered metal composite material into a round shape; the ultrathin layered metal composite material is composed of n layers of metal layers, and the densities of at least 2 layers of the n layers of metal layers are different; the thickness of the ultrathin layered metal composite material is less than 5 mm;
step two
Coating glue on one surface of the layered metal composite material, and sticking the surface with the glue on a lower die base; at the moment, one symmetrical shaft in the layered metal composite material falls on a groove on the lower die base; obtaining a sample to be heated;
step three
Heating the sample obtained in the step two to 60-80 ℃, applying a pressure of 3-10KPa, and keeping the temperature and the pressure for 4-6 hours; cooling; obtaining a sample to be tested;
step four
Fixing the upper punch on a pressure testing machine; the upper die punch is moved downwards so that the convex part of the upper die punch is just opposite to the groove of the lower die holder to be compressed; at the moment, the testing machine automatically records the displacement and the load of the upper punching die; when the layered material is tilted and completely separated, the operation of the pressure testing machine is stopped;
step five
Drawing the displacement and the load recorded in the fourth step into a displacement-load curve, and searching for the load and a corresponding displacement value when the displacement-load curve fluctuates to serve as an evaluation index of the interface bonding strength of the layered metal composite material; the point of fluctuation indicates that the layered material cracks, and the load drops instantaneously and then rises slowly.
2. The use of the apparatus for testing the bonding strength of ultrathin layered metal composites as claimed in claim 1, wherein: in the first step, the ultrathin layered metal composite material is taken and processed into a round sample with the diameter of 30 mm.
3. The use of the apparatus for testing the bonding strength of ultrathin layered metal composites as claimed in claim 1, wherein: the ultrathin layered metal composite material is prepared in a hot-pressing diffusion mode.
4. The use of the apparatus for testing the bonding strength of ultrathin layered metal composites as claimed in claim 1, wherein:
any one of the n metal layers is less than 2mm thick; the total thickness is less than or equal to 10 mm;
the bonding strength of the glue is greater than the bonding strength of the ultrathin layered metal composite material.
5. The use of the apparatus for testing the bonding strength of ultrathin layered metal composites as claimed in claim 1, wherein: the upper edge of the groove on the lower die base is arc-shaped; the radius of the arc is 1-2mm, and the central angle is 30-90 degrees; when the arc is formed, the width of the groove formed in the lower die base refers to the shortest distance between two parallel upper edges of the groove; this distance is greater than the shortest vertical distance between two walls on the same plane on the groove.
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| CN202903601U (en) * | 2012-10-25 | 2013-04-24 | 龙工（上海）桥箱有限公司 | Bonding strength testing device of copper-iron composite sintering material |
| CN104155237A (en) * | 2014-06-18 | 2014-11-19 | 广东工业大学 | Detection method for interface bonding strength of aluminum-steel composite material |
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| CN105890994A (en) * | 2016-06-22 | 2016-08-24 | 重庆大学 | Method for evaluating interface combination strength of layered metal composite material |
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| CN2041814U (en) * | 1988-09-01 | 1989-07-26 | 北京有色金属研究总院 | Fixture for measuring metal |
| JP2885057B2 (en) * | 1994-03-29 | 1999-04-19 | 日本鋼管株式会社 | Evaluation method for bonding strength of clad steel sheet |
| CN2670936Y (en) * | 2003-11-28 | 2005-01-12 | 宝山钢铁股份有限公司 | Mold for testing adhesion of analog zinc layer on stretched bars |
| CN100473971C (en) * | 2004-09-29 | 2009-04-01 | 宝山钢铁股份有限公司 | Apparatus and method for testing coherence of steel sheet zinc coating |
| CN206002426U (en) * | 2016-09-07 | 2017-03-08 | 广州市荣钢金属制品有限公司 | A kind of mould for detecting lining plastic compound steel tube steel with mould bond strength |
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Patent Citations (5)
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| CN202903601U (en) * | 2012-10-25 | 2013-04-24 | 龙工（上海）桥箱有限公司 | Bonding strength testing device of copper-iron composite sintering material |
| CN104155237A (en) * | 2014-06-18 | 2014-11-19 | 广东工业大学 | Detection method for interface bonding strength of aluminum-steel composite material |
| JP2016180719A (en) * | 2015-03-25 | 2016-10-13 | 東レフィルム加工株式会社 | Method of evaluating adhesion strength between base material plastic film and metal layer of metal vapor-deposition plastic film |
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| CN105890994A (en) * | 2016-06-22 | 2016-08-24 | 重庆大学 | Method for evaluating interface combination strength of layered metal composite material |
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