CN111678781A - Single-side matrix test piece anti-pulling testing device and method with microfibers embedded in cement matrix - Google Patents
Single-side matrix test piece anti-pulling testing device and method with microfibers embedded in cement matrix Download PDFInfo
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- CN111678781A CN111678781A CN202010408718.XA CN202010408718A CN111678781A CN 111678781 A CN111678781 A CN 111678781A CN 202010408718 A CN202010408718 A CN 202010408718A CN 111678781 A CN111678781 A CN 111678781A
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- 238000012360 testing method Methods 0.000 title claims abstract description 103
- 239000011159 matrix material Substances 0.000 title claims abstract description 91
- 229920001410 Microfiber Polymers 0.000 title claims abstract description 47
- 239000003658 microfiber Substances 0.000 title claims abstract description 47
- 239000004568 cement Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims description 27
- 238000009864 tensile test Methods 0.000 claims description 6
- 229920006335 epoxy glue Polymers 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006332 epoxy adhesive Polymers 0.000 description 2
- 239000003733 fiber-reinforced composite Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
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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
- 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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- 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
- G01N3/02—Details
- G01N3/04—Chucks
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- 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 discloses a single-side matrix test piece anti-pulling testing device and method with microfibers embedded in a cement matrix, wherein the testing device comprises a test die structure and a testing structure, the single-side matrix test piece with the microfibers embedded is prepared by the test die structure, then the testing structure is used for testing, the testing structure comprises a thin metal sheet, a clamp, a steel plate, a first spherical hinge and a second spherical hinge, the end part of the single-side matrix test piece, extending out of the matrix, of the microfiber is pasted and solidified with the thin metal sheet, the clamp clamps the thin metal sheet, the clamp and the steel plate are both connected with the spherical hinge, and the MTS testing machine is loaded for anti-pulling testing. The invention can design the length of the test piece matrix and the microfiber extending out of the matrix according to requirements, load the single-side matrix test piece in different forms such as single axial tension or fatigue load and the like, and analyze the relationship among load, drawing force, drawing length, fatigue life and the like in the loading process.
Description
Technical Field
The invention relates to a tensile drawing testing device of microfibers in a cement-based material, belongs to the field of concrete material testing, and particularly relates to a tensile drawing testing device and method for a unilateral matrix test piece with microfibers embedded in a cement matrix.
Background
The fiber reinforced composite material has excellent compression resistance and good crack resistance, so that the fiber reinforced composite material is widely applied. The excellent tensile mechanical property is mainly brought by the bonding effect between the fibers distributed in the matrix and the matrix. Thus, the bonding properties between the fibers and the matrix play a crucial role in their performance. In order to quantitatively investigate the fiber-to-matrix forces, it is necessary to test the adhesion between individual fibers and the matrix.
In the prior art, two ends of a substrate are clamped by a clamping type clamp for drawing, local stress concentration is easily generated on the smaller substrate in a clamping state, a compaction effect is caused on fibers, and a measurement result is larger.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art and avoid larger errors caused by local stress concentration, the invention provides a single-side matrix test piece anti-pulling testing device and method with microfibers embedded in a cement matrix.
The technical scheme is as follows: the utility model provides a trial mould structure of unilateral base member test piece, includes roof, bottom plate, base member template and bolt, and roof and bottom plate all include two parts about separable, and the base member template is inserted between two parts about the bottom plate, and two parts respectively have half recess about the bottom plate, and the complete recess can be pieced together to half recess of two parts about the bottom plate, and roof and base member template are equipped with the opening in the position of recess, can place the microfiber between roof and the bottom plate, the bolt is used for pressing from both sides tight roof and bottom plate, bottom plate and base member template.
The utility model provides a tensile testing arrangement that pulls out of unilateral base member test piece of microfiber embedding cement base member, including examination mould structure and the test structure of above-mentioned unilateral base member test piece, the examination mould structure of unilateral base member test piece is used for preparing unilateral base member test piece, the test structure includes the sheetmetal, anchor clamps, the steel sheet, first ball pivot and second ball pivot, the microfiber tip that unilateral base member test piece stretches out the base member pastes the consolidation with the sheetmetal, anchor clamps press from both sides tight sheetmetal, anchor clamps are connected with first ball pivot, the base member tip of unilateral base member test piece pastes the consolidation with the steel sheet, the steel sheet is connected with the second ball pivot, first ball pivot and second ball pivot are installed on the MTS testing machine.
Further, the clamp comprises a front clamping piece, a rear clamping piece and a clamping bolt, the thin metal sheet is arranged between the front clamping piece and the rear clamping piece, and the clamping bolt is used for clamping the front clamping piece and the rear clamping piece.
Further, the end part of the single-side matrix test piece, which extends out of the micro fiber of the matrix, is adhered and fixed with the thin metal sheet through the high-strength epoxy glue.
Further, the openings of the top plate and the base template are equal to the groove width.
Further, the substrate template is plural.
Further, the bolts comprise top plate bolts and bottom plate bolts, the top plate bolts are used for clamping the top plate and the bottom plate, and the bottom plate bolts are used for clamping the bottom plate and the base body template.
Further, the number of the grooves is multiple; a microfiber is disposed in one of the grooves.
A single-side matrix test piece tensile test method for embedding microfibers into a cement matrix comprises the following steps:
step one, determining the number of matrix templates according to the length of a designed matrix of a single-side matrix test piece, inserting the matrix templates between the left part and the right part of a bottom plate, tightening bolts to clamp the bottom plate and the matrix templates, transversely placing microfibers above the centers of all grooves and straightening, tightening bolts to clamp a top plate and the bottom plate to fix the microfibers, pouring and leveling the matrix, and maintaining until a fixed age is to be measured;
step two, sticking the end part of the microfiber of the single-side substrate test piece extending out of the substrate to the surface of a thin metal sheet and curing, putting the thin metal sheet into a clamp for clamping, cutting off the redundant microfiber extending out of the end part of the substrate, sticking the end part of the substrate of the single-side substrate test piece to a steel plate, and connecting the clamp and the steel plate with a spherical hinge when the clamp and the steel plate are used for loading;
and step three, connecting the single-side substrate test piece with the spherical hinge, loading on an MTS tester, and testing the anti-drawing performance.
Further, the loading of the third step comprises monotonic axial tension and/or fatigue loading; the test results are used for analyzing the relationship among the load, the drawing force, the drawing length and the fatigue life in the loading process.
Has the advantages that: compared with the prior art, the single-side matrix test piece is simple and convenient to prepare, the length of the test piece matrix and the length of the microfibers extending out of the matrix can be designed according to needs, loading in different forms such as monotonic axial tension or fatigue load can be carried out on the single-side matrix test piece, and the relation among the load, the drawing force, the drawing length, the fatigue life and the like in the loading process is analyzed. The mode that the base body end is connected with the spherical hinge after the steel plate is adhered is adopted, the influence of base body stress concentration on a measuring result is avoided, the measuring result deviation caused by the stress concentration is reduced, and the process of pulling out the fiber can be observed visually.
Drawings
FIG. 1 is a schematic structural diagram of a test structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a usage status of a test structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a single-sided substrate specimen adhered with a thin metal sheet in an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a clamp according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a test structure bonded to a single-sided substrate test piece in an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
A single-side matrix test piece anti-pulling testing device with microfibers embedded in a matrix comprises a test mold structure and a testing structure of a single-side matrix test piece. The test mold structure is used for preparing a single-side matrix test piece 3, as shown in fig. 1 and 2, the test mold structure comprises a top plate 11, a bottom plate 12, a matrix template 13, top plate bolts 14 and bottom plate bolts 15, the top plate 11 and the bottom plate 12 respectively comprise a left part and a right part which can be separated, the matrix template 13 is inserted between the left part and the right part of the bottom plate, the left part and the right part of the bottom plate are respectively provided with a half groove, the half grooves of the left part and the right part of the bottom plate can be spliced into a complete groove 16, the positions of the grooves of the top plate 11 and the matrix template 13 are provided with openings, the openings of the top plate 11 and the matrix template 13 are equal. The top plate bolts 14 are used for clamping the top plate 11 and the bottom plate 12, and the bottom plate bolts 15 are used for clamping the bottom plate 12 and the base template 13. The test mold structure 1 is provided with a plurality of grooves 16, and a microfiber 17 is placed in one groove 16, so that a plurality of single-side matrix test pieces 3 can be prepared simultaneously.
As shown in fig. 3, the prepared single-sided matrix test piece comprises a matrix 18 and microfibers 17 extending out of the matrix, and in order to clamp the microfibers 17, the microfibers 17 need to be adhered to a thin metal sheet 22 by a high-strength epoxy adhesive 21. As shown in fig. 3 and 4, the test structure comprises a thin metal sheet 22, a clamp 23, a steel plate 24, a first spherical hinge 25 and a second spherical hinge 26, wherein the end of the microfiber 17 of the single-sided substrate specimen extending out of the substrate is fixedly bonded with the thin metal sheet 22 through a high-strength epoxy adhesive 21, the clamp 23 comprises a front clamping piece 231, a rear clamping piece 232 and a clamping bolt 233, the thin metal sheet 22 is placed between the front clamping piece 231 and the rear clamping piece 232, and the clamping bolt 233 is used for clamping the front clamping piece 231 and the rear clamping piece 232 to fix the thin metal sheet 22 and the microfiber 17. The clamp 23 is connected with the first spherical hinge 25 through a bolt, the end part of the substrate of the single-side substrate test piece is fixedly adhered with the steel plate 24 through structural adhesive, the steel plate 24 is connected with the second spherical hinge 26 through a bolt, and the first spherical hinge 25 and the second spherical hinge 26 are installed on the MTS testing machine. The screw connection can also be replaced by other common connection methods.
The embodiment also provides a tensile test method for a single-side matrix test piece with microfibers embedded in a cement matrix, which is characterized by comprising the following steps of:
step one, determining the number of matrix templates according to the length of a designed matrix of a single-side matrix test piece, inserting the matrix templates between the left part and the right part of a bottom plate, tightening bolts to clamp the bottom plate and the matrix templates, transversely placing microfibers above the centers of all grooves and straightening, tightening bolts to clamp a top plate and the bottom plate to fix the microfibers, pouring and leveling the matrix, and maintaining until a fixed age is to be measured;
step two, sticking the end part of the microfiber of the single-side substrate test piece extending out of the substrate to the surface of a thin metal sheet and curing, putting the thin metal sheet into a clamp for clamping, cutting off the redundant microfiber extending out of the end part of the substrate, sticking the end part of the substrate of the single-side substrate test piece to a steel plate, and connecting the clamp and the steel plate with a spherical hinge when the clamp and the steel plate are used for loading;
and step three, connecting the single-side substrate test piece with the spherical hinge, loading on an MTS (maximum temperature stress) testing machine, and carrying out anti-drawing performance tests, wherein the anti-drawing performance tests comprise loading in different forms such as single axial tension, fatigue load and the like, and the test results are used for analyzing the relationship among load, drawing force, drawing length and fatigue life in the loading process.
Claims (10)
1. The utility model provides a trial mould structure of unilateral base member test piece, its characterized in that includes roof, bottom plate, base member template and bolt, and roof and bottom plate all include separable two parts about, and the base member template is inserted between the two parts about the bottom plate, and the two parts respectively have half recess about the bottom plate, and complete recess can be pieced together to half recess of two parts about the bottom plate, and roof and base member template are equipped with the opening in the position of recess, can place the microfiber between roof and the bottom plate, the bolt is used for pressing from both sides tight roof and bottom plate, bottom plate and base member template.
2. The single-side matrix test piece anti-pulling testing device with the microfibers embedded in the cement matrix is characterized by comprising the test die structure and the test structure of the single-side matrix test piece according to claim 1, wherein the test die structure of the single-side matrix test piece is used for preparing the single-side matrix test piece, the test structure comprises a thin metal sheet, a clamp, a steel plate, a first spherical hinge and a second spherical hinge, the end portion, extending out of the matrix, of the single-side matrix test piece is pasted and solidified with the thin metal sheet, the clamp clamps the thin metal sheet, the clamp is connected with the first spherical hinge, the end portion, extending out of the matrix, of the single-side matrix test piece is pasted and solidified with the steel plate, the steel plate is connected with the second spherical hinge, and the first spherical hinge and the second.
3. The single-sided matrix test piece pulling resistance testing device with microfiber embedded in cement matrix of claim 2, wherein the clamp comprises a front clamping piece, a rear clamping piece and a clamping bolt, the thin metal sheet is placed between the front clamping piece and the rear clamping piece, and the clamping bolt is used for clamping the front clamping piece and the rear clamping piece.
4. The single-sided matrix test piece tensile test device with the microfibers embedded in the cement matrix according to any one of claims 2 or 3, wherein the end, extending out of the matrix, of the single-sided matrix test piece is adhered and consolidated with a thin metal sheet through a high-strength epoxy glue.
5. A single-sided matrix test piece tensile testing apparatus with microfibers embedded in a cement matrix according to any one of claims 2 or 3, wherein the openings of the top plate and the matrix template are equal to the width of the groove.
6. The single-sided matrix test piece tensile-drawing test device with the microfibers embedded in the cement matrix, as claimed in any one of claims 2 or 3, is characterized in that a plurality of matrix templates are provided.
7. The single-sided matrix test piece tensile-drawing test device with the microfibers embedded in the cement matrix, as claimed in any one of claims 2 or 3, is characterized in that the bolts comprise top plate bolts and bottom plate bolts, the top plate bolts are used for clamping the top plate and the bottom plate, and the bottom plate bolts are used for clamping the bottom plate and the matrix template.
8. The single-sided matrix test piece tensile-drawing test device for embedding microfibers into a cement matrix according to any one of claims 2 or 3, wherein the number of the grooves is multiple; a microfiber is disposed in one of the grooves.
9. A single-side matrix test piece tensile test method of embedding microfibers into a cement matrix is characterized by comprising the following steps:
step one, determining the number of matrix templates according to the length of a designed matrix of a single-side matrix test piece, inserting the matrix templates between the left part and the right part of a bottom plate, tightening bolts to clamp the bottom plate and the matrix templates, transversely placing microfibers above the centers of all grooves and straightening, tightening bolts to clamp a top plate and the bottom plate to fix the microfibers, pouring and leveling the matrix, and maintaining until a fixed age is to be measured;
step two, sticking the end part of the microfiber of the single-side substrate test piece extending out of the substrate to the surface of a thin metal sheet and curing, putting the thin metal sheet into a clamp for clamping, cutting off the redundant microfiber extending out of the end part of the substrate, sticking the end part of the substrate of the single-side substrate test piece to a steel plate, and connecting the clamp and the steel plate with a spherical hinge when the clamp and the steel plate are used for loading;
and step three, connecting the single-side substrate test piece with the spherical hinge, loading on an MTS tester, and testing the anti-drawing performance.
10. The method for testing the tensile resistance of the single-sided matrix test piece with the microfibers embedded in the cement matrix according to claim 9, wherein the loading in the third step comprises single axial tension and/or fatigue load; the test results are used for analyzing the relationship among the load, the drawing force, the drawing length and the fatigue life in the loading process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010408718.XA CN111678781A (en) | 2020-05-14 | 2020-05-14 | Single-side matrix test piece anti-pulling testing device and method with microfibers embedded in cement matrix |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010408718.XA CN111678781A (en) | 2020-05-14 | 2020-05-14 | Single-side matrix test piece anti-pulling testing device and method with microfibers embedded in cement matrix |
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| CN111678781A true CN111678781A (en) | 2020-09-18 |
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| CN202010408718.XA Pending CN111678781A (en) | 2020-05-14 | 2020-05-14 | Single-side matrix test piece anti-pulling testing device and method with microfibers embedded in cement matrix |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354486A (en) * | 2022-01-06 | 2022-04-15 | 江苏科技大学 | Device and method for testing bonding performance of geomembrane |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204286926U (en) * | 2014-09-23 | 2015-04-22 | 北京师范大学 | A kind of test piece mould of fragility sandwich material and supporting tensile test fixture thereof |
-
2020
- 2020-05-14 CN CN202010408718.XA patent/CN111678781A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204286926U (en) * | 2014-09-23 | 2015-04-22 | 北京师范大学 | A kind of test piece mould of fragility sandwich material and supporting tensile test fixture thereof |
Non-Patent Citations (2)
| Title |
|---|
| CEMENT AND CONCRETE COMPOSITES: "a novel test setup for the characterization of bridging behaviour of single microfibres embedded in a mineral-based matrix", 《CEMENT AND CONCRETE COMPOSITES》 * |
| 翟全胜等: "《中华人民共和国国家标准》", 1 December 2005 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354486A (en) * | 2022-01-06 | 2022-04-15 | 江苏科技大学 | Device and method for testing bonding performance of geomembrane |
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Application publication date: 20200918 |
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