CN114062078B - Sample forming device for curve fiber drawing test - Google Patents
Sample forming device for curve fiber drawing test Download PDFInfo
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- CN114062078B CN114062078B CN202111311654.2A CN202111311654A CN114062078B CN 114062078 B CN114062078 B CN 114062078B CN 202111311654 A CN202111311654 A CN 202111311654A CN 114062078 B CN114062078 B CN 114062078B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a sample forming device for a curve fiber drawing test, which comprises a base, a positioning plate and a top plate, wherein the base, the positioning plate and the top plate are locked by bolts; at least one positioning groove is arranged on each positioning plate at intervals along the transverse direction, positioning grooves on the two positioning plates are arranged in a one-to-one correspondence manner, positioning sheets are arranged in the positioning grooves, grooves with preset curve shapes are formed in the upper surfaces of the positioning sheets, two ends of the fiber are respectively accommodated on the positioning sheets in the corresponding positioning grooves on the two positioning plates, and the middle part of the fiber is positioned in the pouring forming groove; the device places the fiber in the carved groove, can realize the accurate positioning of the curved fiber, finally obtains the curved fiber cement-based test piece with the expected shape, and can obtain the cement matrix with the fiber with different curved shapes by replacing the positioning sheet with the groove with different curved shapes.
Description
Technical Field
The invention relates to the field of fiber drawing tests, in particular to a sample forming device for a curve fiber drawing test.
Background
Cement-based materials are now the most widely used civil engineering materials in human society, but have the essential weaknesses of large shrinkage, poor crack resistance, low tensile properties, low fracture toughness, etc., and the incorporation of fibers into a matrix is one of the important ways to fully overcome the above disadvantages, and in fiber cement composites, the interaction between fibers and matrix is critical to the performance of fiber reinforced concrete. The properties between the fibers and the matrix are typically evaluated by fiber draw tests. Wherein the fiber draw test requires that the distribution of the fibers in the matrix (fiber shape, depth of embedding, angle of distribution, etc.) be consistent with the test expectations. Therefore, how to accurately position the fibers is a critical issue in fiber draw tests.
At present, the research shows that the equivalent bonding strength of the curve fiber is higher than that of the linear fiber, and meanwhile, the curve fiber can reduce the damage and the peeling of the matrix, so that the research on the drawing performance of the curve fiber is very important. In the curve fiber concrete drawing test, the curve fiber in a test piece is required to be fully bonded with matrix concrete; meanwhile, the distribution shape, the embedding depth and the like of the curve fibers in the matrix concrete are required to meet the test requirements. The existing fiber concrete test piece manufacturing device is only suitable for positioning linear fibers, cannot meet the manufacturing requirements of curve fiber concrete test pieces, and cannot realize the research of the conditions of the curve fibers in a matrix according to preset distribution shapes, embedding depths and the like.
Disclosure of Invention
The invention aims to overcome the defects, and provides a sample forming device for a curve fiber drawing test.
The invention solves the technical problem by adopting a scheme that the sample forming device for the curve fiber drawing test comprises a base, two positioning plates and a top plate, wherein the two positioning plates are arranged on the base at intervals in the front-back direction, the top plate is arranged on the positioning plates, the base, the positioning plates and the top plate are locked by bolts, the left side and the right side of the positioning plates are respectively provided with a baffle, and pouring forming grooves are formed among the base, the positioning plates, the top plate and the baffle;
the positioning plates are provided with at least one positioning groove along the transverse interval, the positioning grooves on the two positioning plates are arranged in a one-to-one correspondence manner, positioning sheets are arranged in the positioning grooves, grooves with preset curve shapes are formed in the upper surfaces of the positioning sheets, two ends of the fiber are respectively accommodated in the grooves on the positioning sheets in the corresponding positioning grooves on the two positioning plates, and the middle part of the fiber is positioned in the pouring forming groove.
Further, the left end of the upper surface of the base is longitudinally provided with scale marks, the middle of each scale mark is an O scale, and the two positioning plates are respectively positioned on the front side and the rear side of each O scale.
Further, the base, the locating plate and the top plate are provided with bolt holes which are matched with each other.
Further, the locating piece is fixed in the locating groove.
A method for preparing a test specimen for a curvilinear fiber draw test, comprising the steps of:
step one: selecting a positioning sheet with a groove with the expected shape and length of the curve fiber according to test requirements;
step two: placing the base on a horizontal tabletop, and punching a non-through fixing bolt hole in the base according to the embedding length of the fiber;
step three: accurately placing the front positioning plate and the rear positioning plate on the base according to the embedding length of the fiber and the scale of the base;
step four: selecting proper positioning sheets according to the shape of the fiber, respectively placing the two corresponding positioning sheets in the corresponding positioning grooves on the two positioning plates, and respectively placing the two ends of the fiber in the grooves on the two positioning sheets for fixation;
step five: placing the top plate on the positioning plates respectively, fastening the top plate, the positioning plates and the base by bolts, and finally fixedly mounting baffle plates on the left side and the right side of the bottom plate;
step six: coating a release agent on the inner surface of the pouring molding groove, pouring a cement base material which is fully stirred from the top plate, filling the pouring molding groove with the cement base material, ensuring that fibers are fully covered, and trowelling the surface of cement paste;
step seven: after the cement mortar is coagulated and hardened, removing the baffle, loosening bolts to remove all parts, taking out a molded test piece with curve fibers, immediately placing the test piece into a standard curing room for curing to a set age, and obtaining a test piece of the curve fibers after curing is finished;
step eight: and dividing the cured sample with the curve fiber into small test blocks with single curve fiber according to the size of the test blocks, and performing a curve fiber drawing test.
In step one, multiple sets of different splines may be prepared according to the different curved fiber shapes required for the test.
Compared with the prior art, the invention has the following beneficial effects: the device has the advantages of simple structure and convenient manufacture, is suitable for manufacturing a curved fiber concrete test piece, places the fiber in the engraved groove, can realize accurate positioning of the curved fiber, ensures the accuracy and reliability of a test structure, and finally obtains the curved fiber cement-based test piece with a desired shape.
Drawings
The patent of the invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the overall structure of the device.
Fig. 2 is a top view of the present device.
Fig. 3 is a schematic structural view of the positioning plate.
Fig. 4 is a schematic structural view of the spacer.
Fig. 5 is a schematic view of a base scale.
Fig. 6 is a schematic view of a casting molding area structure.
Fig. 7 is a schematic diagram of the matrix of the obtained curved fiber.
In the figure: 1-a base; 2-baffle A; 3-baffle B; 4-locating plate A; 5-locating plate B; 6-locating piece A; 7-locating piece B; 8-top plate A; 9-top plate B, 10-fixing bolt A; 11-a fixing bolt B; 12-fixing bolts C; 13-fixing bolts D; 14-fibers; 15-pouring a matrix; 16-graduation marks.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
1-7, a sample forming device for curve fiber drawing test comprises a base 1, two positioning plates 4 and 5 arranged on the base at intervals in the front-back direction, and top plates 8 and 9 erected on the positioning plates, wherein the base, the positioning plates and the top plates are locked by bolts 10, 11, 12 and 13, baffle plates 2 and 3 are arranged on the left side and the right side of each positioning plate and are locked with the base by bolts, and pouring forming grooves are formed among the base, the positioning plates, the top plates and the baffle plates;
the positioning plates are provided with at least one positioning groove along the transverse interval, the number of the positioning grooves can be determined according to the requirement of the test number, the positioning grooves on the two positioning plates are arranged in a one-to-one correspondence manner, the positioning grooves are internally provided with positioning sheets 6 and 7, the upper surfaces of the positioning sheets are provided with grooves with preset curve shapes, grooves with specific shapes can be formed on the positioning sheets by using a carving machine or other feasible methods according to the requirement, the positioning sheets are easy to replace, two ends of each fiber 14 are respectively accommodated in the grooves on the positioning sheets in the corresponding positioning grooves on the two positioning plates, and the middle part of each fiber is positioned in the pouring forming groove.
In this embodiment, the positioning sheet needs to engrave the needed groove shape on the positioning sheet by using an engraving machine according to the shape and length of the fiber curve determined by the test, and the device can embed one or more fibers with different curve shapes at a time, and engrave grooves with different curve shapes on a plurality of groups of positioning sheets by using an engraving machine or other feasible methods according to the needed test object, and is assembled as required.
In this embodiment, the left end of the upper surface of the base is provided with a scale mark 16 along the longitudinal direction, the middle of the scale mark is an O scale, and the two positioning plates are respectively located at the front side and the rear side of the O scale.
In this embodiment, the base, the positioning plate and the top plate are all provided with bolt holes matched with each other, and the base is provided with fixing bolt holes for assembling the upper and lower parts according to the length of embedded fibers required by the test.
In this embodiment, the positioning piece is fixed in the positioning groove.
A method for preparing a test specimen for a curvilinear fiber draw test, comprising the steps of:
step one: the positioning sheets are used for manufacturing grooves with expected shapes and lengths on the two opposite positioning sheets according to the shapes of curve fibers required by the test by using a carving machine or other feasible methods; selecting a positioning sheet with a groove with the expected shape and length of the curve fiber according to test requirements;
step two: placing the base on a horizontal tabletop, and punching a non-through fixing bolt hole in the base according to the embedding length of the fiber;
step three: accurately placing the front positioning plate and the rear positioning plate on the base according to the embedding length of the fiber and the scale of the base;
step four: selecting proper positioning sheets according to the shape of the fiber, respectively placing the two corresponding positioning sheets in the corresponding positioning grooves on the two positioning plates, and respectively placing the two ends of the fiber in the grooves on the two positioning sheets for fixation; if glue is filled in the groove, curing the glue;
step five: placing the top plate on the positioning plates respectively, fastening the top plate, the positioning plates and the base by bolts, and finally fixedly mounting baffle plates on the left side and the right side of the bottom plate;
step six: coating a release agent on the inner surface of the pouring molding groove, pouring a cement base material which is fully stirred from the top plate, filling the pouring molding groove with the cement base material, ensuring that fibers are fully covered, and trowelling the surface of cement paste;
step seven: after the cement mortar is coagulated and hardened, the baffle is removed, bolts are loosened to remove all the components, the molded test piece with the curve fiber is taken out, and the test piece is immediately put into a standard curing room for curing until the set age, and the test piece with the curve fiber is obtained after the curing is finished.
Step eight: and dividing the cured sample with the curve fiber into small test blocks with single curve fiber according to the size of the test blocks, and performing a curve fiber drawing test.
In step one, multiple sets of different splines may be prepared according to the different curved fiber shapes required for the test.
The device realizes fiber positioning of various curve shapes through a series of positioning sheets which are provided with grooves with different curve shapes and are convenient to replace, and the positioning sheets with the grooves with specific shapes are used for realizing the accurate positioning of fiber curves according to different test purposes such as the shapes, the embedding depths and the like of the fibers required by the test; the positioning sheets of the device are all arranged in groups of double sheets, and different fiber embedding lengths are controlled by controlling the intervals between a group of plates and sheets; the device controls the embedding length of the fibers when controlling the spacing of a group of plates and sheets, can realize the synchronous movement of the positioning plates and the positioning sheets, ensures that the shape and the embedding length of the fibers are consistent with the expected requirement of the test, does not generate larger test errors because of the movement of the plates and the sheets, and realizes the accurate positioning of the fibers; the locating plate in the device has low cost and is convenient to replace, and a single set of die can be suitable for manufacturing curve fiber cement-based test pieces with different curve parameters only by low cost; based on the same set of device, only different positioning sheets are replaced, so that the identity of different fiber cement-based test pieces is good, and the comparison of test data of different parameters is facilitated; the device can simultaneously embed a plurality of fibers with different curve shapes at one time, and the utilization rate of a single device is higher.
If this patent discloses or relates to components or structures that are fixedly connected to each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In the description of this patent, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the patent, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the patent.
While the foregoing is directed to the preferred embodiment, other and further embodiments of the invention will be apparent to those skilled in the art from the following description, wherein the invention is described, by way of illustration and example only, and it is intended that the invention not be limited to the specific embodiments illustrated and described, but that the invention is to be limited to the specific embodiments illustrated and described.
Claims (5)
1. A sample forming device for curve fiber drawing test, its characterized in that: the device comprises a base, two positioning plates arranged on the base at intervals in the front-back direction and a top plate erected on the positioning plates, wherein the base, the positioning plates and the top plate are locked by bolts, baffle plates are arranged on the left side and the right side of each positioning plate, and pouring forming grooves are formed among the base, the positioning plates, the top plate and the baffle plates;
the positioning plates are provided with at least one positioning groove along the transverse direction at intervals, the positioning grooves on the two positioning plates are arranged in a one-to-one correspondence manner, positioning sheets are arranged in the positioning grooves, grooves with preset curve shapes are formed in the upper surfaces of the positioning sheets, two ends of the fibers are respectively accommodated in the grooves on the positioning sheets in the corresponding positioning grooves on the two positioning plates, and the middle parts of the fibers are positioned in the pouring forming grooves;
the locating plate is fixedly arranged in the locating groove; the positioning sheet is engraved with a required groove shape on the positioning sheet by using an engraving machine according to the shape and the length of the fiber curve determined by the test, grooves with different curve shapes are engraved on a plurality of groups of positioning sheets by using the engraving machine, and the grooves are assembled according to the requirement;
the positioning sheets of the device are all arranged in groups of double sheets, and different fiber embedding lengths are controlled by controlling the intervals between a group of plates and sheets; the device controls the embedded length of the fiber when controlling the spacing of a group of plates and sheets, realizes the synchronous movement of the positioning plates and the positioning sheets, ensures that the shape and embedded length of the fiber are consistent with the expected requirement of the test, does not generate larger test error because of the movement of the plates and the sheets, and realizes the accurate positioning of the fiber.
2. The specimen forming apparatus for a curvilinear fiber draw test according to claim 1, wherein: the left end of the upper surface of the base is longitudinally provided with scale marks, the middle of each scale mark is an O scale, and the two positioning plates are respectively positioned on the front side and the rear side of each O scale.
3. The specimen forming apparatus for a curvilinear fiber draw test according to claim 1, wherein: and the base, the positioning plate and the top plate are provided with bolt holes matched with each other.
4. A method for preparing a test specimen for a curved fiber drawing test, using the test specimen molding apparatus for a curved fiber drawing test according to claim 1, comprising the steps of:
step one: selecting a positioning sheet with a groove with the expected shape and length of the curve fiber according to test requirements;
step two: placing the base on a horizontal tabletop, and punching a non-through fixing bolt hole in the base according to the embedding length of the fiber;
step three: accurately placing the front positioning plate and the rear positioning plate on the base according to the embedding length of the fiber and the scale of the base;
step four: selecting proper positioning sheets according to the shape of the fiber, respectively placing the two corresponding positioning sheets in the corresponding positioning grooves on the two positioning plates, and respectively placing the two ends of the fiber in the grooves on the two positioning sheets for fixation;
step five: placing the top plate on the positioning plates respectively, fastening the top plate, the positioning plates and the base by bolts, and finally fixedly mounting baffle plates on the left side and the right side of the bottom plate;
step six: coating a release agent on the inner surface of the pouring molding groove, pouring a cement base material which is fully stirred from the top plate, filling the pouring molding groove with the cement base material, ensuring that fibers are fully covered, and trowelling the surface of cement paste;
step seven: after the cement mortar is coagulated and hardened, removing the baffle, loosening bolts to remove all parts, taking out a molded test piece with curve fibers, immediately placing the test piece into a standard curing room for curing to a set age, and obtaining a test piece of the curve fibers after curing is finished;
step eight: and dividing the cured sample with the curve fiber into small test blocks with single curve fiber according to the size of the test blocks, and performing a curve fiber drawing test.
5. The method for preparing a test specimen for a curvilinear fiber draw test according to claim 4, wherein: in the first step, a plurality of groups of different positioning sheets are prepared according to different curve fiber shapes required by the test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111311654.2A CN114062078B (en) | 2021-11-08 | 2021-11-08 | Sample forming device for curve fiber drawing test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111311654.2A CN114062078B (en) | 2021-11-08 | 2021-11-08 | Sample forming device for curve fiber drawing test |
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| CN114062078A CN114062078A (en) | 2022-02-18 |
| CN114062078B true CN114062078B (en) | 2023-08-18 |
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| CN114923751B (en) * | 2022-05-17 | 2024-08-30 | 福州大学 | Accurate positioning method for curve fiber sample forming device |
| CN114942167B (en) * | 2022-05-17 | 2024-07-26 | 福州大学 | Sample forming device for curve fiber drawing test and sample preparation method thereof |
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