CN114486562A - Device and method for testing shear strength of composite material - Google Patents
Device and method for testing shear strength of composite material Download PDFInfo
- Publication number
- CN114486562A CN114486562A CN202111655561.1A CN202111655561A CN114486562A CN 114486562 A CN114486562 A CN 114486562A CN 202111655561 A CN202111655561 A CN 202111655561A CN 114486562 A CN114486562 A CN 114486562A
- Authority
- CN
- China
- Prior art keywords
- column
- sample
- mounting groove
- groove
- mounting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 113
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- NAXKFVIRJICPAO-LHNWDKRHSA-N [(1R,3S,4R,6R,7R,9S,10S,12R,13S,15S,16R,18S,19S,21S,22S,24S,25S,27S,28R,30R,31R,33S,34S,36R,37R,39R,40S,42R,44R,46S,48S,50R,52S,54S,56S)-46,48,50,52,54,56-hexakis(hydroxymethyl)-2,8,14,20,26,32,38,43,45,47,49,51,53,55-tetradecaoxa-5,11,17,23,29,35,41-heptathiapentadecacyclo[37.3.2.23,7.29,13.215,19.221,25.227,31.233,37.04,6.010,12.016,18.022,24.028,30.034,36.040,42]hexapentacontan-44-yl]methanol Chemical compound OC[C@H]1O[C@H]2O[C@H]3[C@H](CO)O[C@H](O[C@H]4[C@H](CO)O[C@H](O[C@@H]5[C@@H](CO)O[C@H](O[C@H]6[C@H](CO)O[C@H](O[C@H]7[C@H](CO)O[C@@H](O[C@H]8[C@H](CO)O[C@@H](O[C@@H]1[C@@H]1S[C@@H]21)[C@@H]1S[C@H]81)[C@H]1S[C@@H]71)[C@H]1S[C@H]61)[C@H]1S[C@@H]51)[C@H]1S[C@@H]41)[C@H]1S[C@H]31 NAXKFVIRJICPAO-LHNWDKRHSA-N 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 7
- 239000004917 carbon fiber Substances 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000011185 multilayer composite material Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- -1 barium phenolic aldehyde Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a device and a method for testing the shear strength of a composite material, and belongs to the technical field of shear strength testing. The technical problems that in the prior art, the test data of the shear strength testing device is large in discreteness, and the test effect is not ideal are solved. The testing device provided by the invention comprises an upper stretching rod, a lower stretching rod and a guide sleeve. The testing device is not easy to generate crushing, bending and other forms of damage caused by stress concentration, and can effectively reduce the testing error; and no component force in other directions is generated during loading, so that the accuracy of test data is ensured; in addition, the testing machine has the advantages of simple structure, reliable performance, convenient operation and higher testing efficiency, and can be matched with testing machines of various models.
Description
Technical Field
The invention belongs to the technical field of shear strength testing, and particularly relates to a device and a method for testing the shear strength of a composite material, which are suitable for testing the interface shear strength and the interlaminar shear strength of the composite material.
Background
The composite material is a material formed by combining two or more different substances in different modes, can exert the advantages of various materials, overcomes the defect of a single material, and expands the application range of the material. The composite material has the characteristics of strong designability, excellent performance, high light weight and the like, gradually replaces wood and metal alloy, and is widely applied to the fields of aerospace, automobiles, electronics and electrics, buildings, body-building equipment and the like.
In the practical application process, in order to meet the performance requirements, people usually combine single composite materials with different functions by technical means such as adhesive bonding and co-curing to prepare a multilayer composite material product with more excellent performance. For multilayer composite articles, the interfacial properties between the various structural layers directly affect the final quality of the product. In the prior art, although the conventional method for testing the interface performance of the composite material can be used for representing the interface shear strength of most multilayer composite materials, a sample is easy to generate stress concentration in the testing process, and after the sample is locally damaged and deformed, additional component force is easy to generate, so that the test data is large in discreteness, and the test effect is not ideal.
Disclosure of Invention
In view of the above, in order to solve the above technical problems, the present invention provides a device and a method for testing shear strength of a composite material, which can be used for testing interface shear strength of dissimilar materials and interlayer shear strength of the same material, and reduce the influence of other damage forms (crushing, bending, etc.) on the test result during the test process.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a device for testing the shear strength of a composite material, which consists of an upper stretching rod, a lower stretching rod and a guide sleeve;
the upper stretching rod consists of a first fixing column, a first connecting column and a first mounting column; the first fixing column and the first connecting column are both cylinders, the diameter of the first fixing column is smaller than that of the first connecting column, and a first pin hole is formed in the first fixing column; the first mounting column is a semi-cylinder, and the diameter of the first mounting column is equal to that of the first connecting column; a rectangular surface of the first mounting column is provided with a cylindrical first sample mounting groove and a semi-cylindrical first observation hole; the first sample mounting groove is coaxial with the central axis of the rectangular surface of the first mounting column; the two first observation grooves are symmetrically arranged relative to the central axis of the first connecting column; the central shaft of the first observation groove is vertical to the central shaft of the first mounting column and the central shaft of the first sample mounting groove; the first mounting column is also provided with a first sample dismounting hole; the first fixing column and the first mounting column are respectively fixed at two ends of the first connecting column and are coaxial with the first connecting column;
the lower stretching rod consists of a second fixing column, a second connecting column and a second mounting column; the second fixing column and the second connecting column are both cylinders, the diameter of the second connecting column is equal to that of the first connecting column, the diameter of the second fixing column is smaller than that of the second connecting column, and a second pin hole is formed in the second fixing column; the diameter of the second mounting column is equal to that of the second connecting column; a second sample mounting groove and a second observation groove are formed in the rectangular surface of the second mounting column; the second sample mounting groove is in a square shape with the same groove length and width, the groove length of the second sample mounting groove is larger than the diameter of the first sample mounting groove, and the groove depth of the second sample mounting groove is equal to that of the first sample mounting groove; the two second observation grooves are semi-cylindrical and are symmetrically arranged relative to the central axis of the second connecting column, and the central axis of the second observation groove is vertical to the central axis of the second mounting column and the central axis of the second sample mounting groove; a second sample dismounting hole is formed in the second mounting column, and the second fixing column and the second mounting column are respectively fixed at two ends of the second connecting column and are coaxial with the second connecting column;
the first mounting column and the second mounting column can be spliced into a combined cylinder, after splicing, the first sample mounting groove and the second sample mounting groove are coaxial, and the two first observation grooves are respectively spliced with the two second observation grooves to form two first observation holes;
the guide sleeve is cylindrical, and a plurality of fastening screw holes and two second observation holes are formed in the direction perpendicular to the axial direction; the inner diameter of the guide sleeve is matched with the outer diameters of the first connecting column and the second connecting column, is sleeved outside the combined cylinder and is fixed through a fastening screw and the top of the spring washer; the two second sight holes are aligned with the two first sight holes.
Further, the central axis of the first sample dismounting hole is perpendicular to the central axis of the first mounting column and coaxial with the central axis of the first sample mounting groove;
the second sample dismounting hole is perpendicular to the central shaft of the second mounting column and coaxial with the central shaft of the second sample mounting groove.
Further, the diameter of the upper stretching rod is
The total length is 150-200 mm, the length of the first mounting column is 70-100 mm, and the diameter of the first sample mounting groove is
The groove depth of the first sample mounting groove is 4.0-6.0 mm.
Further, the diameter of the lower stretching rod is within
The total length is 150-200 mm, the length of the second mounting column is 70-100 mm, the length of the second mounting column is smaller than that of the first mounting column by 1-3 mm, the groove length of the second sample mounting groove is 40.1-50.4 mm, and the groove depth of the second sample mounting groove is 4.0-6.0 mm; the diameters of the first observation holes are all
In between.
Further, the thickness of the guide sleeve is 5-8 mm, the length of the guide sleeve is 50-70 mm, the inner diameter of the guide sleeve is larger than the outer diameter of the first connecting column by 0.2-0.6 mm, and the diameter of the second observation hole is equal to that of the first connecting column
In the meantime.
Furthermore, the inner edges of the two ends of the guide sleeve are provided with reverse C2-C5 bevel angles.
Further, the upper stretching rod is made of a metal material with the yield strength not lower than Q345B steel, and the lower stretching rod is made of a metal material with the yield strength not lower than Q345B steel.
The method for testing the shear strength by adopting the composite material shear strength testing device comprises the following steps:
step one, preparing a test sample;
the structure of the test sample consists of a square base and a cylindrical boss coaxially fixed on the square base, the square base and the cylindrical boss are integrally formed, the size of the square base is matched with that of a second sample mounting groove and can be placed in the second sample mounting groove, and the size of the cylindrical boss is matched with that of a first sample mounting groove and can be placed in the first sample mounting groove; the length and the width of the square base are equal and larger than the diameter of the cylindrical boss, and the height of the square base is equal to the height of the cylindrical boss;
placing a square base of a test sample into a second sample mounting groove, positioning a cylindrical boss in the first sample mounting groove, keeping the single-side gaps of the side wall between 0.1 mm and 0.4mm, splicing the first mounting column and the second mounting column into a combined cylinder, sleeving a guide sleeve outside the combined cylinder, and fixing the guide sleeve by a fastening screw and a spring washer;
step three, fixedly connecting the first fixing column with a moving platform of the tensile machine through a first pin hole, and fixedly connecting the second fixing column with a base of the tensile machine through a second pin hole;
and fourthly, starting a tensile machine to apply load to the test sample until the test sample is damaged, and calculating the interface shear strength or the interlayer shear strength through the magnitude of the applied stress and the bottom area of the cylindrical boss of the test sample after the test is finished.
Furthermore, the length and the width of the square structure are 40-50 mm, and the diameter of the cylindrical boss is within the range
And the height of the square base is equal to the height of the cylindrical boss and ranges from 4mm to 6 mm.
Further, the square base is cut or milled, the cylindrical boss is turned by the turning auxiliary tool, the turning auxiliary tool is of a cylindrical structure, a square groove is formed in the top surface, the length and the width of the square groove are 0.2-0.5 mm larger than the length and the width of the square base respectively, and the depth of the groove is smaller than 0.2-0.5 mm of the thickness of the square base.
Further, the loading rate of the tensile machine is 1-5 mm/min.
Compared with the prior art, the invention has the beneficial effects that:
the device for testing the shear strength of the composite material has higher bonding degree with a sample, is not easy to generate crushing, bending and other forms of damage caused by stress concentration, and can effectively reduce test errors;
the device for testing the shearing strength of the composite material can ensure that the shearing damage is generated on a testing surface, an interface is always kept on the axis of the tensile force, and component forces in other directions cannot be generated during loading, so that the accuracy of test data is ensured;
the device for testing the shear strength of the composite material has the advantages of simple structure, reliable performance, convenient operation and high testing efficiency, and can be used with testing machines of various models.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic structural diagram of a composite shear strength testing device according to the present invention;
FIG. 2 is a disassembled schematic view of the composite shear strength testing device of the present invention;
FIG. 3 is a schematic structural view of a test specimen used in the composite shear strength test method of the present invention;
FIG. 4 is a schematic structural diagram of a turning auxiliary tool used in the method for testing the shear strength of the composite material of the present invention;
in the figure, 1, an upper stretching rod, 1-1, a first sample mounting groove, 1-2, a first sample dismounting hole, 1-3, a first pin hole, 1-4, a first observation groove, 2, a lower stretching rod, 2-1, a second sample mounting groove, 2-2, a second sample dismounting hole, 2-3, a second pin hole, 2-4, a second observation groove, 3, a guide sleeve, 3-1, a second observation hole, 4, a fastening screw, 5, a square base, 5, 6, a cylindrical boss, 7 and a test plane.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention, but it is to be understood that the description is intended to illustrate further features and advantages of the invention, and not to limit the scope of the claims.
As shown in fig. 1 to 4, the device for testing the shear strength of the composite material of the present invention is composed of an upper tensile bar 1, a lower tensile bar 2 and a guide sleeve 3.
The upper stretching rod 1 consists of a first fixing column, a first connecting column and a first mounting column. The first fixing column and the first connecting column are both cylinders, the diameter of the first fixing column is smaller than that of the first connecting column, and first pin holes 1-3 are formed in the first fixing column and used for being connected with a moving platform of a tensile machine. The first mounting column is a semi-cylinder, and the diameter of the first mounting column is equal to that of the first connecting column; a rectangular surface of the first mounting column is provided with a cylindrical first sample mounting groove 1-1 and a semi-cylindrical first observation hole 1-4; the first sample mounting groove 1-1 is coaxial with the central axis of the rectangular surface of the first mounting column; the number of the first observation grooves 1-4 is two, and the first observation grooves are symmetrically arranged relative to the central axis of the first connecting column; the central axis of the first observation groove 1-4 is perpendicular to the central axis of the first mounting post and the central axis of the first sample mounting groove 1-1. The first mounting column is also provided with a first sample dismounting hole 1-2, and the central axis of the first sample dismounting hole 1-2 is perpendicular to the central axis of the first mounting column and coaxial with the central axis of the first sample mounting groove 1-1, and is used for dismounting the test sample after the test is finished. First fixed column and first erection column are fixed respectively at the both ends of first connecting column, and all are coaxial with first connecting column. Preferably, the upper draw bar 1 has a diameter of
The total length is between 150 and 200mm, and the length of the first mounting column is between 70 and 100 mm. Preferably, the depth of the first sample mounting groove 1-1 is 4.0-6.0 mm, and the diameter of the first sample mounting groove 1-1 is
Preferably, the material of the upper tensile bar 1 is a metal material having a yield strength of not lower than Q345B steel.
The lower stretching rod 2 consists of a second fixing column, a second connecting column and a second mounting column. The second fixing column and the second connecting column are both cylinders, the diameter of the second connecting column is equal to that of the first connecting column, the diameter of the second fixing column is smaller than that of the second connecting column, and a second pin hole 2-3 is formed in the second fixing column and used for being connected with a base of a tensile machine. The second mounting column is a semi-cylinder, and the diameter of the second mounting column is equal to that of the second connecting column; a second sample mounting groove 2-1 and a second observation groove 2-4 are formed in the rectangular surface of the second mounting column; the second sample mounting groove 2-1 is a square body with the same groove length and width, the groove length of the second sample mounting groove 2-1 is larger than the diameter of the first sample mounting groove 1-1, and the groove depth of the second sample mounting groove 2-1 is equal to the groove depth of the first sample mounting groove 1-1; the two second observation grooves 2-4 are semi-cylindrical and are symmetrically arranged relative to the central axis of the second connecting column, and the central axis of the second observation groove 2-4 is vertical to the central axis of the second mounting column and the central axis of the second sample mounting groove 2-1. The second mounting column is provided with a second sample dismounting hole 2-2, and the second sample dismounting hole 2-2 is perpendicular to the central axis of the second mounting column and coaxial with the central axis of the second sample mounting groove 2-1 and is used for dismounting the test sample after the test is finished. The second fixing column and the second mounting column are respectively fixed at two ends of the second connecting column and are coaxial with the second connecting column. Preferably, the diameter of the lower draw bar 2 is in
The total length is between 150 mm and 200mm, the length of the second mounting column is between 70mm and 100mm, and the length of the second mounting column is smaller than that of the first mounting columnThe column is 1-3 mm. Preferably, the groove depth of the second sample mounting groove 2-1 is 4.0-6.0 mm, and the groove length of the second sample mounting groove 2-1 is 40.1-50.4 mm. Preferably, the material of the lower stretching rod 2 is a metal material having a yield strength not lower than that of Q345B steel.
The first mounting column and the second mounting column can be spliced into a combined cylinder, after splicing, the first sample mounting groove 1-1 and the second sample mounting groove 2-1 are coaxial, and the two first observation grooves 1-4 are spliced with the two second observation grooves 2-4 respectively to form two first observation holes. The preferred first viewing aperture diameter is in
In the meantime.
The guide sleeve 3 is cylindrical, and a plurality of fastening screw holes and two second observation holes 3-1 are arranged in the direction perpendicular to the axial direction. The internal diameter of guide sleeve 3 and the external diameter cooperation of first spliced pole and second spliced pole, the suit is outside the combination cylinder to it is fixed through fastening screw 4 and spring washer top. Two second sight holes 3-1 are symmetrical with respect to the central axis of the guide sleeve 3 and are aligned with two first sight holes, the first and second sight holes 3-1 being used to determine the position of the test specimen. Preferably, the inner edges of the two ends of the guide sleeve 3 are provided with inverted C2-C5 bevels. Preferably, the thickness of the guide sleeve 3 is 5-8 mm, the length of the guide sleeve is 50-70 mm, and the inner diameter of the guide sleeve 3 is larger than the outer diameter of the first connecting column by 0.2-0.6 mm. The preferred diameter of the second viewing aperture 3-1 is within
In the meantime.
The method for testing the shear strength of the composite material comprises the following steps:
step one, preparing a test sample;
as shown in fig. 3, the structure of the test sample comprises a square base 5 and a cylindrical boss 6 coaxially fixed on the square base 5, the square base 5 and the cylindrical boss 6 are integrally formed, the size of the square base 5 is matched with the size of the second sample installation groove 2-1 and can be placed in the second sample installation groove 2-1, and the size of the cylindrical boss 6 is matched with the size of the first sample installation groove 1-1 and can be placed in the first sample installation groove 1-1; the length and the width of the square base 5 are equal and larger than the diameter of the cylindrical boss 6, and the height of the square base 5 is equal to the height of the cylindrical boss 6;
preferably, the length and the width of the cubic structure 5 are between 40 and 50mm, and the diameter of the cylindrical boss 6 is between
The height of the square base 5 is equal to the height of the cylindrical boss 6 and is 4-6 mm;
the cylindrical boss 6 and the square base 5 can be made of different materials or the same material, four corners of the square base 5 can be chamfered, and the shear strength of the test surface 7 is tested;
the square base 5 is usually cut or milled, the cylindrical boss 6 can be turned by a turning auxiliary tool, the turning auxiliary tool is of a cylindrical structure, a square groove is formed in the top surface, the length and the width of the square groove are respectively 0.2-0.5 mm longer than the length and the width of the square base 5, and the depth of the groove is smaller than 0.2-0.5 mm of the thickness of the square base 5.
Secondly, placing a square base 5 of a test sample into a second sample mounting groove 2-1, positioning a cylindrical boss 6 of the test sample into the first sample mounting groove 1-1, keeping the unilateral clearance of the side wall between 0.1 mm and 0.4mm, splicing a first mounting column and a second mounting column group into a combined cylinder, sleeving a guide sleeve 3 outside the combined cylinder, and fastening and fixing the guide sleeve by a fastening screw 4 and a spring washer top;
step three, fixedly connecting a first fixing column with a moving platform of the tensile machine through a first pin hole 1-3, and fixedly connecting a second fixing column with a base of the tensile machine through a second pin hole 2-3;
fourthly, starting a tensile machine to apply load to the test sample until the test sample is damaged, and calculating the interface shear strength or the interlayer shear strength through the magnitude of the applied stress and the bottom area of the cylindrical boss 6 of the test sample after the test is finished; preferably, the loading rate of the tensile machine is 1-5 mm/min.
The terms used in the present invention generally have meanings commonly understood by those of ordinary skill in the art, unless otherwise specified.
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the following embodiments.
In the following examples, various procedures and methods not described in detail are conventional methods well known in the art. Materials, reagents, devices, instruments, apparatuses and the like used in the following examples are commercially available unless otherwise specified.
Example 1
The method for testing the interfacial shear strength between the high silica/carbon fiber multilayer composite materials comprises the following steps:
s1, preparing a high silica/barium phenolic aldehyde sample plate with the thickness of 5mm, and curing and forming for later use;
s2, laying carbon fiber prepreg on the cured high silica sample plate, wherein the thickness of the carbon fiber prepreg is 5mm, and carrying out autoclave curing molding;
s3, machining a square base 5 of the test sample in a cutting or milling mode after curing is finished, turning a cylindrical boss 6 of the test sample by using an auxiliary tool, and grinding the cylindrical boss 6 to a specified height;
s4, placing a square base 5 of a test sample into a second sample mounting groove 2-1, positioning a cylindrical boss 6 into a first sample mounting groove 1-1, splicing a first mounting column and a second mounting column into a combined cylinder, sleeving a guide sleeve 3 outside the combined cylinder, and fastening and fixing the guide sleeve by a fastening screw 4 and the top of a spring washer;
s5, connecting a first fixed column of the upper stretching rod 1 with a moving platform of the tensile machine through a first pin hole 1-3, and connecting a second fixed column of the lower stretching rod 2 with a base of the tensile machine through a second pin hole 2-3;
and S6, starting a tensile machine to apply load to the test sample until the test sample is damaged, wherein the loading rate is 2mm/min, and after the test is finished, calculating the interface shear strength through the magnitude of the applied stress and the bottom area of the cylindrical boss 6 of the test sample.
S7, after one set of tests is finished, the test sample can be removed through the first sample removing hole 1-2 and the second sample removing hole 2-2 and the next set of test samples can be tested.
Example 2
The method for testing the interfacial shear strength of the aluminum alloy/carbon fiber composite material comprises the following steps:
s1, processing the square aluminum alloy plate with the square base 5 structure by using a linear cutting mode, and performing surface sand blasting treatment;
s2, laying carbon fiber/epoxy resin prepreg on the sand blasting surface of the aluminum alloy plate, and carrying out autoclave curing molding;
s3, turning the cylindrical boss 6 of the test sample by using an auxiliary tool after the solidification is finished, and grinding the cylindrical boss 6 to a specified height;
s4, placing a square base 5 of a test sample into a second sample mounting groove 2-1, positioning a cylindrical boss 6 into a first sample mounting groove 1-1, splicing a first mounting column and a second mounting column into a combined cylinder, sleeving a guide sleeve 3 outside the combined cylinder, and fastening and fixing the guide sleeve by a fastening screw 4 and the top of a spring washer;
s5, connecting a first fixed column of the upper stretching rod 1 with a moving platform of the tensile machine through a first pin hole 1-3, and connecting a second fixed column of the lower stretching rod 2 with a base of the tensile machine through a second pin hole 2-3;
and S6, starting a tensile machine to apply load to the test sample until the test sample is damaged, wherein the loading rate is 2mm/min, and after the test is finished, calculating the interface shear strength through the magnitude of the applied stress and the bottom area of the cylindrical boss 6 of the test sample.
S7, after one set of tests is finished, the test sample can be removed through the first sample removing hole 1-2 and the second sample removing hole 2-2 and the next set of test samples can be tested.
Example 3
The interlaminar shear strength test method of the carbon fiber/epoxy resin composite material comprises the following steps:
s1, laying carbon fiber prepreg according to a process laying layer of [0 °/+45 °/90 °/-45 ° ] n, wherein the laying thickness is 12-13 mm;
s2, carrying out vacuum packaging, and carrying out autoclave curing molding;
s3, machining a square base 5 of the test sample in a cutting or milling mode after curing is finished, turning a cylindrical boss 6 of the test sample by using an auxiliary tool, and grinding the cylindrical boss 6 to a specified height;
s4, placing a square base 5 of a test sample into a second sample mounting groove 2-1, positioning a cylindrical boss 6 into a first sample mounting groove 1-1, splicing a first mounting column and a second mounting column into a combined cylinder, sleeving a guide sleeve 3 outside the combined cylinder, and fastening and fixing the guide sleeve by a fastening screw 4 and the top of a spring washer;
s5, connecting a first fixed column of the upper stretching rod 1 with a moving platform of the tensile machine through a first pin hole 1-3, and connecting a second fixed column of the lower stretching rod 2 with a base of the tensile machine through a second pin hole 2-3;
and S6, starting a tensile machine to apply load to the test sample until the test sample is damaged, wherein the loading rate is 2mm/min, and after the test is finished, calculating the interface shear strength through the magnitude of the applied stress and the bottom area of the cylindrical boss 6 of the test sample.
S7, after one set of tests is finished, the test sample can be removed through the first sample removing hole 1-2 and the second sample removing hole 2-2 and the next set of test samples can be tested.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The device for testing the shear strength of the composite material is characterized by consisting of an upper stretching rod (1), a lower stretching rod (2) and a guide sleeve (3);
the upper stretching rod (1) consists of a first fixing column, a first connecting column and a first mounting column; the first fixing column and the first connecting column are both cylinders, the diameter of the first fixing column is smaller than that of the first connecting column, and a first pin hole (1-3) is formed in the first fixing column; the first mounting column is a semi-cylinder, and the diameter of the first mounting column is equal to that of the first connecting column; a first cylindrical sample mounting groove (1-1) and a first semi-cylindrical observation hole (1-4) are formed in the rectangular surface of the first mounting column; the first sample mounting groove (1-1) is coaxial with the central axis of the rectangular surface of the first mounting column; the number of the first observation grooves (1-4) is two, and the first observation grooves are symmetrically arranged relative to the central axis of the first connecting column; the central axis of the first observation groove (1-4) is vertical to the central axis of the first mounting column and the central axis of the first sample mounting groove (1-1); the first mounting column is also provided with a first sample dismounting hole (1-2); the first fixing column and the first mounting column are respectively fixed at two ends of the first connecting column and are coaxial with the first connecting column;
the lower stretching rod (2) consists of a second fixing column, a second connecting column and a second mounting column; the second fixing column and the second connecting column are both cylinders, the diameter of the second connecting column is equal to that of the first connecting column, the diameter of the second fixing column is smaller than that of the second connecting column, and a second pin hole (2-3) is formed in the second fixing column; the diameter of the second mounting column is equal to that of the second connecting column; a second sample mounting groove (2-1) and a second observation groove (2-4) are formed in the rectangular surface of the second mounting column; the second sample mounting groove (2-1) is in a square shape with the same groove length and width, the groove length of the second sample mounting groove (2-1) is larger than the diameter of the first sample mounting groove (1-1), and the groove depth of the second sample mounting groove (2-1) is equal to that of the first sample mounting groove (1-1); the two second observation grooves (2-4) are semi-cylindrical and are symmetrically arranged relative to the central axis of the second connecting column, and the central axis of the second observation groove (2-4) is vertical to the central axis of the second mounting column and the central axis of the second sample mounting groove (2-1); a second sample dismounting hole (2-2) is also formed in the second mounting column; the second fixing column and the second mounting column are respectively fixed at two ends of the second connecting column and are coaxial with the second connecting column;
the first mounting column and the second mounting column can be spliced into a combined cylinder, after splicing, the first sample mounting groove (1-1) and the second sample mounting groove (2-1) are coaxial, and the two first observation grooves (1-4) are respectively spliced with the two second observation grooves (2-4) to form two first observation holes;
the guide sleeve (3) is cylindrical, and a plurality of fastening screw holes and two second observation holes (3-1) are formed in the direction perpendicular to the axial direction; the inner diameter of the guide sleeve (3) is matched with the outer diameters of the first connecting column and the second connecting column, is sleeved outside the combined cylinder and is fixed through a fastening screw (4) and the top of the spring washer; two second portholes (3-1) are aligned with the two first portholes.
2. The composite shear strength testing apparatus of claim 1,
the central axis of the first sample dismounting hole (1-2) is vertical to the central axis of the first mounting column and is coaxial with the central axis of the first sample mounting groove (1-1);
the second sample dismounting hole (2-2) is vertical to the central axis of the second mounting column and is coaxial with the central axis of the second sample mounting groove (2-1).
3. The composite shear strength testing apparatus of claim 1,
the diameter of the upper stretching rod (1) is
The total length is between 150 mm and 200mm, the length of the first mounting column is between 70mm and 100mm, and the diameter of the first sample mounting groove (1-2) is
The groove depth of the first sample mounting groove (1-2) is 4.0-6.0 mm;
the diameter of the lower stretching rod (2) is
The total length is between 150 mm and 200mm, the length of the second mounting column is between 70mm and 100mm, and the length of the second mounting column is smaller than that of the first mounting column1-3 mm, the length of the second sample mounting groove (2-1) is 40.1-50.4 mm, and the depth of the second sample mounting groove (2-1) is 4.0-6.0 mm; the diameters of the first observation holes are all
In between.
4. The composite material shear strength testing device according to claim 1, wherein the thickness of the guide sleeve (3) is 5-8 mm, the length of the guide sleeve is 50-70 mm, the inner diameter of the guide sleeve (3) is larger than the outer diameter of the first connecting column by 0.2-0.6 mm, and the diameters of the second observation holes (3-1) are all within the range of
In the meantime.
5. The composite material shear strength testing device according to claim 1, wherein the inner edges of both ends of the guide sleeve (3) are provided with an inverted C2-C5 bevel.
6. The composite shear strength testing device according to claim 1, wherein the material of the upper tensile bar (1) is a metal material having a yield strength not lower than Q345B steel, and the material of the lower tensile bar (2) is a metal material having a yield strength not lower than Q345B steel.
7. The method for testing the shear strength of the composite material by using the composite material shear strength testing device as claimed in any one of claims 1 to 6, is characterized by comprising the following steps:
step one, preparing a test sample;
the structure of the test sample consists of a square base (5) and a cylindrical boss (6) coaxially fixed on the square base (5), the square base (5) and the cylindrical boss (6) are integrally formed, the size of the square base (5) is matched with that of a second sample mounting groove (2-1) and can be placed in the second sample mounting groove (2-1), and the size of the cylindrical boss (6) is matched with that of a first sample mounting groove (1-1) and can be placed in the first sample mounting groove (1-1); the length and the width of the square base (5) are equal and are larger than the diameter of the cylindrical boss (6), and the height of the square base (5) is equal to the height of the cylindrical boss (6);
secondly, placing a square base (5) of a test sample into a second sample mounting groove (2-1), positioning a cylindrical boss (6) into the first sample mounting groove (1-1), keeping the unilateral clearance of the side wall between 0.1 mm and 0.4mm, splicing a first mounting column group and a second mounting column group into a combined cylinder, sleeving a guide sleeve (3) outside the combined cylinder, and fastening and fixing the guide sleeve through a fastening screw (4) and a spring washer top;
step three, fixedly connecting a first fixing column with a moving platform of the tensile machine through a first pin hole (1-3), and fixedly connecting a second fixing column with a base of the tensile machine through a second pin hole (2-3);
and fourthly, starting a tensile machine to apply load to the test sample until the test sample is damaged, and calculating the interface shear strength or the interlayer shear strength through the magnitude of the applied stress and the bottom area of the cylindrical boss (6) of the test sample after the test is finished.
8. The method for testing shear strength of claim 7, wherein the cube structure 5 has a length and width of 40-50 mm, and the diameter of the cylindrical boss (6) is within the range of
The height of the square base (5) is equal to the height of the cylindrical boss (6) and is 4-6 mm.
9. The method for testing the shear strength according to claim 7, wherein the square base (5) is cut or milled, the cylindrical boss (6) is turned by a turning auxiliary tool, the turning auxiliary tool is a cylindrical structure, a square groove is formed in the top surface, the length and the width of the square groove are 0.2-0.5 mm longer than those of the square base (5), and the depth of the square groove is less than 0.2-0.5 mm of the thickness of the square base (5).
10. The method for testing shear strength of claim 7, wherein the loading rate of the tensile machine is 1-5 mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111655561.1A CN114486562B (en) | 2021-12-30 | 2021-12-30 | Device and method for testing shear strength of composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111655561.1A CN114486562B (en) | 2021-12-30 | 2021-12-30 | Device and method for testing shear strength of composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114486562A true CN114486562A (en) | 2022-05-13 |
| CN114486562B CN114486562B (en) | 2024-06-21 |
Family
ID=81508572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111655561.1A Active CN114486562B (en) | 2021-12-30 | 2021-12-30 | Device and method for testing shear strength of composite material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114486562B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116223248A (en) * | 2022-12-09 | 2023-06-06 | 中材科技风电叶片股份有限公司 | Tool and method for testing interfacial shear of blade root embedded metal sleeve and composite material |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202486040U (en) * | 2012-03-12 | 2012-10-10 | 郑州大学 | Test sample for testing interface binding strength of metal surface coating |
| CN203365241U (en) * | 2013-07-11 | 2013-12-25 | 上海大学 | Testing device for interface tensile bonding strength of laminated metal composite |
| CN105758791A (en) * | 2016-03-01 | 2016-07-13 | 银邦金属复合材料股份有限公司 | Device and method for measuring bonding strength of metal composite interface, sample and manufacturing method for sample |
| CN107328642A (en) * | 2017-05-08 | 2017-11-07 | 银邦金属复合材料股份有限公司 | The mould and method of a kind of test compound material interface shear strength |
| CN206772698U (en) * | 2017-05-16 | 2017-12-19 | 西安锐思博创应用材料科技有限公司 | A kind of composite interlayer testing device for shear strength |
| CN109416306A (en) * | 2016-06-10 | 2019-03-01 | 麦格纳外饰公司 | The fixture of cutting performance for test microvia foamed thermoplastic composite plate weld portion |
| US20210164875A1 (en) * | 2019-12-02 | 2021-06-03 | Restone As | Bond strength testing |
| CN113252448A (en) * | 2021-03-22 | 2021-08-13 | 中南大学 | Interface shear strength testing device and method for novel heterogeneous layered gradient composite material |
| CN113324852A (en) * | 2021-04-27 | 2021-08-31 | 东南大学 | Interface bonding static and dynamic performance test device and test method |
-
2021
- 2021-12-30 CN CN202111655561.1A patent/CN114486562B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202486040U (en) * | 2012-03-12 | 2012-10-10 | 郑州大学 | Test sample for testing interface binding strength of metal surface coating |
| CN203365241U (en) * | 2013-07-11 | 2013-12-25 | 上海大学 | Testing device for interface tensile bonding strength of laminated metal composite |
| CN105758791A (en) * | 2016-03-01 | 2016-07-13 | 银邦金属复合材料股份有限公司 | Device and method for measuring bonding strength of metal composite interface, sample and manufacturing method for sample |
| CN109416306A (en) * | 2016-06-10 | 2019-03-01 | 麦格纳外饰公司 | The fixture of cutting performance for test microvia foamed thermoplastic composite plate weld portion |
| US20190178763A1 (en) * | 2016-06-10 | 2019-06-13 | Magna Exteriors Inc. | Fixture for testing the shear performance of microcellular-foamed thermoplastic composite welds |
| CN107328642A (en) * | 2017-05-08 | 2017-11-07 | 银邦金属复合材料股份有限公司 | The mould and method of a kind of test compound material interface shear strength |
| CN206772698U (en) * | 2017-05-16 | 2017-12-19 | 西安锐思博创应用材料科技有限公司 | A kind of composite interlayer testing device for shear strength |
| US20210164875A1 (en) * | 2019-12-02 | 2021-06-03 | Restone As | Bond strength testing |
| CN113252448A (en) * | 2021-03-22 | 2021-08-13 | 中南大学 | Interface shear strength testing device and method for novel heterogeneous layered gradient composite material |
| CN113324852A (en) * | 2021-04-27 | 2021-08-31 | 东南大学 | Interface bonding static and dynamic performance test device and test method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116223248A (en) * | 2022-12-09 | 2023-06-06 | 中材科技风电叶片股份有限公司 | Tool and method for testing interfacial shear of blade root embedded metal sleeve and composite material |
| CN116223248B (en) * | 2022-12-09 | 2024-06-21 | 中材科技风电叶片股份有限公司 | Tool and method for testing interfacial shear of blade root embedded metal sleeve and composite material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114486562B (en) | 2024-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106198219B (en) | A kind of test method of composite laminated plate biaxial stretching performance | |
| Singh et al. | Drilling-induced damage in uni-directional glass fiber reinforced plastic (UD-GFRP) composite laminates | |
| Bert | Experimental characterization of composites | |
| Adams et al. | The V-notched rail shear test | |
| CN114486562A (en) | Device and method for testing shear strength of composite material | |
| CN110108567B (en) | Ceramic matrix composite interlaminar tensile test piece, and preparation method and test method thereof | |
| CN109668785A (en) | A kind of adjustable sheet structure compresses buckling test fixture | |
| US10866175B2 (en) | Self contained load frame for in-situ inspection | |
| CN111292813A (en) | Method for drawing fracture forming limit diagram of anisotropic material based on fracture criterion and use method thereof | |
| CN113203621A (en) | Special clamp for mechanical test of plate-shaped sample | |
| CN104568543B (en) | A kind of method of testing for large diameter thin wall pipe compression performance | |
| CN107091782B (en) | Test device and method for testing III-type fracture energy release rate of composite material | |
| CN105842084A (en) | Measurement device of wood along-grain direction pure shear strength | |
| CN109443885B (en) | Rock triaxial tensile test piece set device and manufacturing method thereof | |
| Lee et al. | Study on drilling characteristics and mechanical properties of CFRP composites | |
| CN111896352A (en) | Sample for testing shear performance of foam core material, manufacturing method and testing method | |
| JP5909114B2 (en) | Fracture mechanics parameter measurement method | |
| JP2002228564A (en) | Compression/shear test method and its testing device | |
| Maurya et al. | Experimental tests to characterize the behavior and properties of IM7-8552 composite | |
| CN212321230U (en) | Test specimen for testing shear performance of foam core material | |
| CN111487319A (en) | Laminate microstructure damage detection based on vibration excitation | |
| CN217654904U (en) | Testing tool for tensile strength and modulus between layers of composite material | |
| CN219391589U (en) | Multi-angle pull-shear clamp for non-metallic materials convenient to disassemble and assemble | |
| CN218725989U (en) | Combined loading type in-plane compression clamp with self-centering structure | |
| Hwang et al. | Theoretical approach for the mechanical behaviors of conical composite tubes considering fiber orientation errors under static loads |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |