CN109883819A - The cohesive force dynamic Hubbing method and built-up jig of fiber cement composites - Google Patents

The cohesive force dynamic Hubbing method and built-up jig of fiber cement composites Download PDF

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Publication number
CN109883819A
CN109883819A CN201910165389.8A CN201910165389A CN109883819A CN 109883819 A CN109883819 A CN 109883819A CN 201910165389 A CN201910165389 A CN 201910165389A CN 109883819 A CN109883819 A CN 109883819A
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China
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plate
spring
fixed frame
fiber
test specimen
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CN201910165389.8A
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马钢
赵晖
邓克招
张玉
王志勇
都思哲
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Taiyuan University of Technology
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Taiyuan University of Technology
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Priority to CN201910165389.8A priority Critical patent/CN109883819A/en
Publication of CN109883819A publication Critical patent/CN109883819A/en
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Abstract

The invention discloses the cohesive force dynamic Hubbing methods and built-up jig that are directed to fiber cement composites, it is related to the clamp art of fiber stretching, including is rushed force-bearing steel plate, transmission rod, spring positioning guide rod, spring, spring pre-tightening fixture block, leveling nut, test specimen fixed frame top plate, test specimen fixed frame bottom plate, fixed frame pull rod, force snesor, outline border top plate, outer frame bottom plate, outer gimbal support bar, annular fixture, laser displacement sensor, laser reflection piece, wrapping wire roll shaft, threaded rod support composition.The fixture belongs to fiber dynamic tensile fixture, and collocation drop hammer impact testing machine can carry out the detection of cement-based material interfacial bond property.The built-up jig is reasonable in design, and links harmony is good, can be used for a variety of dynamic tensile tests in conjunction with drop hammer impact testing machine, can improve testing efficiency, guarantee the accuracy of test.

Description

The cohesive force dynamic Hubbing method and built-up jig of fiber cement composites
Technical field
The cohesive force dynamic Hubbing method and built-up jig of fiber cement composites of the present invention, belong to fixture and use Method and technology field.
Background technique
Fiber concrete is a kind of advanced composite material (ACM) using fiber as reinforcing material, concrete for matrix, and fiber is to mixed Cement matrix in solidifying soil has humidification to be greatly improved its toughness, physical mechanics property after fiber is added in cement matrix Matter, such as resistance to compression, tension, warp resistance intensity have different degrees of raising.Since fiber is larger with shared unit volume and counts Amount is distributed evenly in inside concrete, and fiber and cement matrix pass through the interfacial interaction of two kinds of materials, and fiber is from essence On change the deformation performance of concrete, fine ribs of the addition of fiber like mixing enormous amount in concrete.Work as load When acting on concrete, fiber and the common stress of cement matrix and deformation, there are strain differentials on interface for cement matrix and fiber And the interfacial adhesion generated, play the role of preventing the initiation of distress in concrete, diffusion and absorb big energy, therefore changes Adhesion strength between kind fiber and cement matrix improves fiber to the toughening effect of concrete, so as to improve the change of concrete Shape performance.
Fiber is divided into the rigid fiber using steel fibre as representative and is generation with carbon fiber, glass fibre, basalt fibre etc. The flexible fiber of table.In practical projects, the destruction of fiber concrete is largely that fiber and cement-based interface bond Caused by performance failure, therefore, the cohesive force of fiber and cement matrix directly affect fiber to the enhancing of concrete, toughening and Effect is split in resistance, and the quantitatively characterizing of interface binding intensity is particularly important.And the method for characterizing interface mechanics has very much, wherein Single wire drawing is the important means for evaluating fiber and cement-based interface adhesive property.Lot of domestic and international scholar is to fiber concrete Monofilament pull-out test has been carried out, and has obtained a large amount of significant as a result, but the overwhelming majority is studied in statics field at present. Interfacial property is fewer and fewer to the research of fiber concrete dynamic changes of strength monofilament drawing process mechanical property.
In recent years, domestic as people are to the needs of multiple material dynamic stretching and the development of dynamic tensile technology Many colleges and universities and R&D institution expand the dynamic tensile experimental study to multiple material, and wherein high strength fibre is as high-intensitive The important component of composite material, its dynamic mechanical gradually cause the concern of people with the needs of reality.Due to fibre The dynamic tensile mechanical property of dimension and there is larger difference with static stretch, so directly using by the static test of pressure result of fiber It is biased in the analysis of its dynamic mechanical response, therefore, the dynamic mechanical of fibre bundle and fibre single thread is tested And show that tensile impact stress-strain diagram will be very crucial.Fixture according to the present invention, consider under dynamic load function, For fiber bodies and the fiber cement-based interfacial bond property for carrying out dynamic monofilament pull-out test test fiber and cement base.
Summary of the invention
To solve the shortcomings of the prior art, the invention discloses the cohesive force of fiber cement composites dynamics to draw Draw out method and built-up jig, rationally, links harmony is good for fixture design, and this method combination drop hammer impact testing machine is available It is tested in a variety of dynamic tensiles, testing efficiency can be improved, guarantee the accuracy of test.
The invention is realized by the following technical scheme:
The cohesive force dynamic drawing built-up jig of fiber cement composites, including to be rushed force-bearing steel plate, transmission rod, spring fixed Position guide rod, spring, spring pre-tightening fixture block, outer framework, test specimen fixed frame, force snesor, annular fixture, laser displacement sensor, With wrapping wire roll shaft;The outer framework includes horizontally disposed outline border top plate and outer frame bottom plate, the outline border top plate and outer frame bottom plate Symmetric position be provided with multiple outer gimbal support bar screw holes, outer gimbal support bar passes through the outer gimbal support bar screw hole, will it is described outside Frame top plate and outer frame bottom plate link into an integrated entity;
Being centrosymmetric in the middle part of the outer frame bottom plate, there are two spring positioning guide rod screw hole and multiple threaded rod supported holes, institutes for setting It states threaded rod supported hole internal screw thread and wears threaded rod support;
The center symmetric setting of being rushed on force-bearing steel plate is there are two transmission rod screw hole, center symmetric setting on the outline border top plate There are two power transmission rod aperture, the positional symmetries of the transmission rod screw hole, power transmission rod aperture and the spring positioning guide rod screw hole;Described two Equal vertical direction activity wears transmission rod in a power transmission rod aperture, and the transmission rod is big rigidity double-threaded screw bar, two transmission rods Upper end is connect by screw with by the transmission rod screw hole rushed on force-bearing steel plate, and lower end passes through screw and spring pre-tightening fixture block top phase Even;
Spring pre-tightening fixture block lower part connecting spring location guide, the big rigidity that the spring positioning guide rod is vertically arranged are double Head screw bar is located on same vertical axis with the transmission rod, and the spring positioning guide rod upper end passes through screw and spring It pre-tightens fixture block to be connected, lower end passes through the spring positioning guide rod screw hole and with screw connection leveling nut;The spring positioning The outer pocketed springs of guide rod shaft, the both ends difference elastic compression spring pre-tightening fixture block of the spring and outer frame bottom plate;In vertical side To spring pre-tightening fixture block provides certain pretightning force to spring together with leveling nut;
Horizontal screw hole, two horizontal screw holes are arranged in relative inner face symmetric position between two spring pre-tightening fixture blocks Each connection wrapping wire roll shaft one end, the wrapping wire roll shaft is double thread bar, and wrapping wire roll shaft both ends are additionally provided with fastening nut, The fastening nut is set on the inside of horizontal screw hole;In the horizontal direction, two spring pre-tightening fixture block collocation are as wrapping wire roll shaft Support, and support is provided for wrapping wire roll shaft together by horizontal screw hole;Be slidingly connected annular fixture outside the wrapping wire roll shaft, described Annular fixture cross section is c-type, is bonded with the wrapping wire roll shaft, is provided with clamping screw, the annular on the annular fixture Fixture compresses wrapping wire roll shaft by clamping screw;
The test specimen fixed frame includes horizontally disposed test specimen fixed frame top plate and test specimen fixed frame bottom plate, the test specimen fixed frame Top plate upper surface center is provided with force snesor screw hole one, and the force snesor screw hole is connected with force snesor;The test specimen is solid Determine frame bottom plate center and be provided with fiber preformed hole to pass through for fiber filament;The panel of test specimen fixed frame top plate and test specimen fixed frame bottom plate Four vertex are nearby symmetrically provided with fixed frame pull rod screw hole, and fixed frame pull rod passes through the fixed frame pull rod screw hole, by the examination Part fixed frame top plate links into an integrated entity with test specimen fixed frame bottom plate;The fixed frame pull rod is big rigidity double-threaded screw bar;
The outline border roof center is provided with force snesor screw hole two, and the force snesor is dynamic tension sensor, is located at outline border Between top plate and test specimen fixed frame top plate, the force snesor upper and lower ends pass through screw connection outline border top plate respectively and test specimen is solid Determine frame top plate;
Setting laser reflection piece is pasted on the outside of the spring pre-tightening fixture block, and the laser reflection piece is mating is provided with laser displacement Sensor.
The laser displacement sensor can be substituted by the non-contact displacement transducer with identity function.
The threaded rod support is big rigidity one start screw bar, and threaded rod supports upper end to connect by screw thread and outer frame bottom plate It connects, lower end base is processed into flat bell mouth shape.
It is described by rush force-bearing steel plate be both ends be symmetrically provided with screw hole big rigidity square plate, for directly bear test Machine drops hammer the dynamic loading given.
The annular fixture inner wall is provided with elastic rubber layer.
The method that the cohesive force dynamic pull-out test of fiber cement composites is carried out using the fixture, including with Lower step:
Step 1: preparing fiber cement substrates test specimen: configuring the fiber of each intensity according to the intensity of each standard fibers cement base Cement base test specimen;
Step 2: fixture is assembled completely, laser reflection piece is pasted on spring pre-tightening fixture block lateral surface;
Step 3: being in a horizontal position wrapping wire roll shaft by screwing leveling nut, while screwing leveling nut to bullet before test Spring applies pretightning force appropriate, and fiber cement substrates test specimen is placed in test specimen fixed frame corresponding position, long fibre is made to be located at fiber Preformed hole, fiber preformed hole of the long fibre downward from test specimen fixed frame bottom plate center for drawing is pierced by, by long fibre end Portion is wound in wrapping wire roll shaft corresponding position, and coincides with the pulling force effect line of fiber gauge length section and drawing equipment after positioning Same straight line after the completion of wrapping wire, tightens the fastening nut at the screw thread of wrapping wire roll shaft both ends, and mobile annular fixture be located at around Behind fiber winding position on roll dies axis, the tightened tight bolt locking annular snap tool of hand;
When step 4 is tested, which is placed in below drop hammer impact testing machine, the impact force for the tup that guarantees to drop hammer Position installs laser displacement sensor along fibre length direction, and hits upward laser positioned at spring pre-tightening fixture block The laser reflection piece of lateral surface, release is dropped hammer to impact the force-bearing steel plate that rushed of the built-up jig, and records related data.
Compared with the prior art, the invention has the following beneficial effects:
(1) fixture of the present invention can simultaneously obtain fiber dynamic tensile strength, fiber Dynamic Fracture elongation ε and fibre Tie up energy to failure W0Etc. multinomial dynamic mechanical index;
(2) device can be by selecting the length of different length to change the gauge length segment length L of fiber to carry out different length The test for spending fiber measures, and the former long L of general gauge length can be 3mm-20mm or so;
(3) since diameter micron order flexible fiber generally cannot be clamped directly in test, the brittleness of fiber often make its With regard to being broken in clamping process, even if clamping successfully, clamping end can generate damage to fiber, and the fracture of fiber occurs At jaw, institute's measured data cannot reflect the genuine property of fiber.In view of the above problems, fixture of the present invention is clamped using winding Mode, what the fiber filament sliding and fixture port fiber that avoidable classic flat-plate clamping mode occurs during the test were first broken Phenomenon.
The utility model fixture has many characteristics, such as orderly to wind, encircles extruding, smoothly lays out;Wherein, ordered arrangement winding can be protected Do not occur to stack and squeeze between card fiber winding ring, guarantees that clamp device can lock;Thin layer rubber pad built in annular fixture Piece is realized on the basis of ordered arrangement is wound by this annular fixture and encircles extruding, can more expeditiously realize fixture Big frictional resistance between fiber prevents fiber and roller bearing in experimentation from generating Relative sliding;Camber line smoothly lays out avoidable Failure by shear caused by fiber is concentrated due to clip position stress during stretching;On test specimen fixed frame bottom plate described in the present apparatus Equipped with stepped hole, play the fixed function to test specimen, prevent during the experiment test specimen slide, and in test specimen fixed frame In height allowed band, the fibres bond power of measurement cement base test specimen different height size may be implemented, to subtract by comparison Small experimental error.
Detailed description of the invention
Following further describes the present invention with reference to the drawings.
Fig. 1 is overall structure of the present invention;
Fig. 2 is outline border top plate opening schematic diagram;
Fig. 3 is outer frame bottom plate aperture schematic diagram;
Fig. 4 includes that Fig. 4 A and Fig. 4 B, Fig. 4 A are annular fixture scheme of installation, and 4B is the sectional view along A-A of Fig. 4 A;
Fig. 5 is experimental implementation flow chart.
In figure, 1- is rushed force-bearing steel plate, 2- transmission rod, 3- spring positioning guide rod, 4- spring, 5- spring pre-tightening fixture block, 6- Leveling nut, 7- test specimen fixed frame top plate, 8- test specimen fixed frame bottom plate, 9- fixed frame pull rod, 10- force snesor, 11- outline border top Plate, the outer frame bottom plate of 12-, 13- outer gimbal support bar, 14- annular fixture, 16- laser reflection piece, 17- wrapping wire roll shaft, 18- threaded rod Support, 19- fastening nut, 21- transmission rod screw hole, 22- power transmission rod aperture, 23- cement base test block, 24- monfil, 31- spring Location guide screw hole, 80- fiber preformed hole, 101- force snesor screw hole one, 102- force snesor screw hole two, 131- outer gimbal support Bar screw hole, 141- clamping screw, 142- elastic rubber layer, 181- threaded rod supported hole.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, but protection scope of the present invention is not Be limited to these embodiments, it is all without departing substantially from the change of present inventive concept or equivalent substitute be included in protection scope of the present invention it It is interior.
The cohesive force dynamic drawing built-up jig embodiment of 1.1 fiber cement composites
A kind of cohesive force dynamic drawing built-up jig of fiber cement composites, including rushed force-bearing steel plate 1, transmission rod 2, Spring positioning guide rod 3, spring pre-tightening fixture block 5, outer framework, test specimen fixed frame, force snesor 10, annular fixture 14, swashs at spring 4 Optical displacement sensor and wrapping wire roll shaft 17;The outer framework includes horizontally disposed outline border top plate 11 and outer frame bottom plate 12, described Symmetric position on outline border top plate 11 and on outer frame bottom plate 12 is provided with multiple outer gimbal support bar screw holes 131, outer gimbal support bar 13 Across the outer gimbal support bar screw hole 131, the outline border top plate 11 and outer frame bottom plate 12 are linked into an integrated entity;
Being centrosymmetric in the middle part of the outer frame bottom plate 12, there are two spring positioning guide rod screw holes 31 and multiple threaded rods to support for setting Hole 181,181 internal screw thread of threaded rod supported hole wear threaded rod support 18;
The center symmetric setting of being rushed on force-bearing steel plate 1 is there are two transmission rod screw hole 21, in two transmission rod screw holes 21 respectively Fixing force transfer bar 2;There are two power transmission rod aperture 22, the transmission rod screw hole 21 to pass for center symmetric setting on the outline border top plate 11 The positional symmetry of power rod aperture 22 and the spring positioning guide rod screw hole 31;Equal vertical direction activity in described two power transmission rod aperture 22 A transmission rod 2 is worn, the transmission rod 2 is big rigidity double-threaded screw bar, and two transmission rod upper ends are held by screw with by punching Transmission rod screw hole 21 on power steel plate 1 connects, and lower end is connected by screw with 5 top of spring pre-tightening fixture block;
The 5 lower part connecting spring location guide 3 of spring pre-tightening fixture block, the spring positioning guide rod 3 are vertically arranged big rigid Double-threaded screw bar is spent, is located on same vertical axis with the transmission rod 2,3 upper end of spring positioning guide rod passes through screw It is connected with spring pre-tightening fixture block 5, lower end passes through the spring positioning guide rod screw hole 31 and with screw connection leveling nut 6;Institute State the outer pocketed springs 4 of 3 shaft of spring positioning guide rod, the both ends difference elastic compression spring pre-tightening fixture block 5 and outline border of the spring 4 Bottom plate 12;In vertical direction, spring pre-tightening fixture block 5 and leveling nut 6 provide certain pretightning force to spring 4 together;
Horizontal screw hole, two horizontal spiral shells are arranged in relative inner face symmetric position between two spring pre-tightening fixture blocks 5 Hole respectively connects 17 one end of wrapping wire roll shaft, and the wrapping wire roll shaft 17 is double thread bar, and 17 both ends of wrapping wire roll shaft are additionally provided with Fastening nut 19, the fastening nut 19 are set on the inside of horizontal screw hole;In the horizontal direction, two spring pre-tightening fixture blocks 5 are arranged in pairs or groups It is together that wrapping wire roll shaft 17 provides support together as the support of wrapping wire roll shaft 17, and by horizontal screw hole;The wrapping wire roll shaft Be slidingly connected annular fixture 14 outside 17, and annular 14 cross section of fixture is c-type, is bonded with the wrapping wire roll shaft 17, the ring Clamping screw 141 is provided on shape fixture, the annular fixture 14 compresses wrapping wire roll shaft 17 by clamping screw 141;Such as Fig. 4 institute Show, A schemes to indicate the cross section of the annular fixture and wrapping wire roll shaft in Fig. 4, and B figure indicates fastening nut and the wrapping wire roll shaft Positional relationship.
The test specimen fixed frame includes horizontally disposed test specimen fixed frame top plate 7 and test specimen fixed frame bottom plate 8, the test specimen 7 upper surface center of fixed frame top plate is provided with force snesor screw hole 1, and the force snesor screw hole is connected with force snesor 10 It connects;8 center of test specimen fixed frame bottom plate is provided with fiber preformed hole 80 and passes through for fiber filament;Test specimen fixed frame top plate 7 and examination Four vertex of panel of part fixed frame bottom plate 8 are nearby symmetrically provided with fixed frame pull rod screw hole, and fixed frame pull rod 9 passes through the fixation Frame pull rod screw hole links into an integrated entity the test specimen fixed frame top plate 7 with test specimen fixed frame bottom plate 8;The fixed frame pull rod 9 is Big rigidity double-threaded screw bar;
11 center of outline border top plate is provided with force snesor screw hole 2 102, and the force snesor 10 is dynamic tension sensor, position Between outline border top plate 11 and test specimen fixed frame top plate 7,10 upper and lower ends of force snesor pass through screw connection outline border respectively Top plate 11 and test specimen fixed frame top plate 7;
On the outside of the spring pre-tightening fixture block 5 paste setting laser reflection piece 16, with the laser reflection piece 16 it is mating be provided with it is sharp Optical displacement sensor.
The laser displacement sensor can be substituted by the non-contact displacement transducer with identity function.
The threaded rod support 18 is big rigidity one start screw bar, and threaded rod supports 18 upper ends to pass through screw thread and outer frame bottom plate 12 connections, lower end base are processed into flat bell mouth shape.
It is described by rush force-bearing steel plate 1 be both ends be symmetrically provided with screw hole big rigidity square plate, for directly bear try The machine of testing drops hammer the dynamic loading given.
Annular 14 inner wall of fixture is provided with elastic rubber layer.
It is four that the threaded rod, which supports 18 quantity,.
13 quantity of outer gimbal support bar is four.
1.2 measuring principles:
During the test, what the tup that drops hammer impacted the built-up jig is rushed force-bearing steel plate 1, passes through rigid transmission rod 2, the impact Effect causes the compression of spring 4, wrapping wire roll shaft 17 to generate displacement to extract the fiber in cement base, the dynamic drawing of fiber Load change with time rule (Curve) it can be measured and be recorded by the force snesor 10 being connected with test specimen fixed frame, by Its peak value dynamic loadFibre single thread cohesive force peak strength can be obtained with the ratio of fibre single thread surface area A;Pass through The changing rule (s-t curve) of the relative slippage s of fiber and cement base test block t at any time can be obtained in laser displacement sensor; It can finally obtain the dynamics constitutive relation of fibre single thread drawing, i.e.,Full curve.
1.3 methods that the cohesive force dynamic pull-out test of fiber cement composites is carried out using the fixture, are passed through Following steps are realized:
Four threaded rod supports 18 are connect by step 1 with outer frame bottom plate 12, and the upper and lower side of four outer gimbal support bars 13 is screwed into respectively Outer gimbal support bar screw hole 131 is connected in one outline border top plate 11 and outer frame bottom plate 12 to form the outer framework of fixture;
The mobile annular fixture 14 of loosening is inserted in wrapping wire roll shaft 17 by step 2, and 17 liang of terminal screws of wrapping wire roll shaft are screwed into respectively In the horizontal screw hole of the medial surface of two spring pre-tightening fixture blocks 5;
Step 3 is rushed force-bearing steel plate 1 and is located at 11 top of outline border top plate, and force-bearing steel plate 1 is rushed in two 2 upper end of transmission rod connections, will After 2 lower end of transmission rod is passed down through the preformed hole power transmission rod aperture 22 on outline border top plate 11, it is pre- that 2 lower end of transmission rod is screwed into spring respectively Tight 5 upper end of fixture block is attached;
Two 3 upper ends of spring positioning guide rod step 4 sequentially pass through the reserved spring positioning guide rod screw hole 31 and bullet of outer frame bottom plate 12 It after spring 4, is connect with 5 lower end of spring pre-tightening fixture block, 3 lower end of spring positioning guide rod is screwed into leveling nut 6, and leveling nut 6 is located at outer 12 lower section of frame bottom plate;
10 upper end of force snesor is screwed into 11 lower part screw hole of outline border top plate by screw by step 5, and 10 lower end of force snesor passes through spiral shell Force snesor screw hole on silk connection test specimen fixed frame top plate 7, test specimen fixed frame top plate 7 and test specimen fixed frame bottom plate 8 pass through four Root fixed frame pull rod 9 is connected.
Laser reflection piece 16 is pasted on 5 lateral surface of spring pre-tightening fixture block by step 6.
Before step 7 test, it is in a horizontal position wrapping wire roll shaft 17 by screwing leveling nut 6, while screwing leveling spiral shell Female 6 pairs of springs 4 apply pretightning force appropriate, cohesion test test specimen are placed in test specimen fixed frame corresponding position, for drawing Fiber preformed hole 80 of the long fibre downward from 8 center of test specimen fixed frame bottom plate is pierced by, and long fibre end is wound in winding-roller 17 corresponding position of axis, and the pulling force effect line of fiber gauge length section and drawing equipment after positioning is made to coincide with same straight line, around The fastening nut 19 at 17 both ends screw thread of wrapping wire roll shaft should be tightened after the completion of silk, and mobile annular fixture 14 is located at winding-roller Behind fiber winding position on axis 17, hand twists clamping screw 141 and locks annular fixture.
When step 8 is tested, which is placed in below drop hammer impact testing machine, the tup that guarantees to drop hammer rushes It hits line of force and laser displacement sensor 15 is installed along fibre length direction, and it is pre- positioned at spring to hit upward laser The laser reflection piece 16 of tight 5 lateral surface of fixture block, release, which is dropped hammer, is rushed force-bearing steel plate 1 with impact the built-up jig, and records phase Close data.
The present invention is not limited by embodiment illustrated herein, and is to fit to and principles disclosed herein and novelty The consistent widest range of feature.

Claims (9)

1. the cohesive force dynamic drawing built-up jig of fiber cement composites, which is characterized in that including being rushed force-bearing steel plate (1), transmission rod (2), spring positioning guide rod (3), spring (4), spring pre-tightening fixture block (5), outer framework, test specimen fixed frame, power pass Sensor (10), annular fixture (14), laser displacement sensor (15) and wrapping wire roll shaft (17);
The outer framework includes horizontally disposed outline border top plate (11) and outer frame bottom plate (12), the outline border top plate (11) and outline border The symmetric position of bottom plate (12) is provided with multiple outer gimbal support bar screw holes (131), and outer gimbal support bar (13) passes through the outline border branch Hack lever screw hole (131) links into an integrated entity the outline border top plate (11) and outer frame bottom plate (12);
Being centrosymmetric in the middle part of the outer frame bottom plate (12), there are two spring positioning guide rod screw hole (31) and multiple threaded rods for setting Supported hole (181), threaded rod supported hole (181) internal screw thread wear threaded rod support (18);
It is described to be rushed on force-bearing steel plate (1) there are two center symmetric settings transmission rod screw hole (21), on the outline border top plate (11) There are two power transmission rod aperture (22), the transmission rod screw hole (21), power transmission rod aperture (22) and the spring positionings for center symmetric setting The positional symmetry of guide rod screw hole (31);Equal vertical direction activity is worn transmission rod (2) in described two power transmission rod aperture (22), described Transmission rod (2) is big rigidity double-threaded screw bar, and two transmission rod upper ends are by screw and by the transmission rod rushed on force-bearing steel plate (1) Screw hole (21) connection, lower end are connected by screw with spring pre-tightening fixture block (5) top;
Spring pre-tightening fixture block (5) the lower part connecting spring location guide (3), the spring positioning guide rod (3) are vertically arranged Big rigidity double-threaded screw bar, be located on same vertical axis with the transmission rod (2), spring positioning guide rod (3) upper end Head is connected by screw with spring pre-tightening fixture block (5), and lower end passes through the spring positioning guide rod screw hole (31) and connected with screw Connect leveling nut (6);Elastic force is distinguished at the outer pocketed springs (4) of spring positioning guide rod (3) shaft, the both ends of the spring (4) Holddown spring pre-tightens fixture block (5) and outer frame bottom plate (12);In vertical direction, spring pre-tightening fixture block (5) and leveling nut (6) are together Certain pretightning force is provided to spring (4);
Horizontal screw hole, two levels are arranged in relative inner face symmetric position between two spring pre-tightening fixture blocks (5) Screw hole respectively connects wrapping wire roll shaft (17) one end, and the wrapping wire roll shaft (17) is double thread bar, wrapping wire roll shaft (17) both ends It is additionally provided with fastening nut (19), the fastening nut (19) is set on the inside of horizontal screw hole;In the horizontal direction, two springs are pre- The support that tight fixture block (5) is arranged in pairs or groups as wrapping wire roll shaft (17), and be together that wrapping wire roll shaft (17) provide support by horizontal screw hole; It is slidingly connected annular fixture (14) outside the wrapping wire roll shaft (17), annular fixture (14) cross section is c-type, with the wrapping wire Roll shaft (17) is bonded, and is provided with clamping screw (141) on the annular fixture, the annular fixture (14) passes through clamping screw (141) wrapping wire roll shaft (17) are compressed;
The test specimen fixed frame includes horizontally disposed test specimen fixed frame top plate (7) and test specimen fixed frame bottom plate (8), the test specimen Fixed frame top plate (7) upper surface center is provided with force snesor screw hole one (101), the force snesor screw hole and force snesor (10) It is connected;Test specimen fixed frame bottom plate (8) center is provided with fiber preformed hole (80) and passes through for fiber filament;Test specimen fixed frame top Four vertex of panel of plate (7) and test specimen fixed frame bottom plate (8) are nearby symmetrically provided with fixed frame pull rod screw hole, fixed frame pull rod (9) the fixed frame pull rod screw hole is passed through, the test specimen fixed frame top plate (7) and test specimen fixed frame bottom plate (8) are connected into one Body;The fixed frame pull rod (9) is big rigidity double-threaded screw bar;
Outline border top plate (11) center is provided with force snesor screw hole two (102), and the force snesor (10) is dynamic tension biography Sensor, between outline border top plate (11) and test specimen fixed frame top plate (7), force snesor (10) upper and lower ends pass through respectively Screw connection outline border top plate (11) and test specimen fixed frame top plate (7);
Setting laser reflection piece (16) is pasted on the outside of the spring pre-tightening fixture block (5), is matched with the laser reflection piece (16) and is arranged It is equipped with laser displacement sensor (15).
2. the cohesive force dynamic drawing built-up jig of fiber cement composites according to claim 1, feature exist In the laser displacement sensor (15) can be substituted by the non-contact displacement transducer with identity function.
3. the cohesive force dynamic drawing built-up jig of fiber cement composites according to claim 1, feature exist In the threaded rod support (18) is big rigidity one start screw bar, and threaded rod supports (18) upper end to pass through screw thread and outer frame bottom plate (12) it connects, lower end base is processed into flat bell mouth shape.
4. the cohesive force dynamic drawing built-up jig of fiber cement composites according to claim 1, feature exist In, it is described by the square plate that force-bearing steel plate (1) is the big rigidity that both ends are symmetrically provided with screw hole is rushed, for directly bearing testing machine It drops hammer the dynamic loading given.
5. the cohesive force dynamic drawing built-up jig of fiber cement composites according to claim 1, feature exist In described annular fixture (14) inner wall is provided with elastic rubber layer.
6. the cohesive force dynamic drawing built-up jig of fiber cement composites according to claim 1, feature exist In threaded rod support (18) quantity is four.
7. the cohesive force dynamic drawing built-up jig of fiber cement composites according to claim 1, feature exist In outer gimbal support bar (13) quantity is four.
8. carrying out the cohesive force dynamic pull-out test of fiber cement composites using the fixture as claimed in claim 1 to 7 Method, which is characterized in that during the test, what the tup that drops hammer impacted the built-up jig is rushed force-bearing steel plate, passes through rigidity Transmission rod, the shock effect cause the compression of spring, wrapping wire roll shaft to generate displacement to extract the fiber in cement base;
The dynamic drawing load of fiber change with time rule (Curve) by the force snesor that is connected with test specimen fixed frame It measures and records, by its peak value dynamic loadWith fibre single thread surface areaRatio to obtain fibre single thread cohesive force peak value strong Degree
Changing rule (the s-t of the relative slippage s of fiber and cement base test block t at any time is obtained by laser displacement sensor Curve);Finally obtain the dynamics constitutive relation of fibre single thread drawing, i.e.,Full curve.
9. carrying out the cohesive force dynamic pull-out test of fiber cement composites using the fixture as claimed in claim 1 to 7 Method, which comprises the following steps:
Step 1: preparing fiber cement substrates test specimen: configuring the fiber of each intensity according to the intensity of each standard fibers cement base Cement base test specimen;
Step 2: fixture is assembled completely, laser reflection piece is pasted on spring pre-tightening fixture block lateral surface;
Step 3: being in a horizontal position wrapping wire roll shaft by screwing leveling nut, while screwing leveling nut to bullet before test Spring applies pretightning force appropriate, and fiber cement substrates test specimen is placed in test specimen fixed frame corresponding position, long fibre is made to be located at fiber Preformed hole, fiber preformed hole of the long fibre downward from test specimen fixed frame bottom plate center for drawing is pierced by, by long fibre end Portion is wound in wrapping wire roll shaft corresponding position, and the fiber gauge length paragraph hammering blow experiment machine equipment suspension after positioning is made to drop hammer Pulling force effect line coincides with same straight line, after the completion of wrapping wire, tightens the fastening nut at the screw thread of wrapping wire roll shaft both ends, and move After dynamic annular fixture is located at the winding of the fiber on wrapping wire roll shaft position, the tightened tight bolt locking annular snap tool of hand;
When step 4 is tested, which is placed in below drop hammer impact testing machine, the impact force for the tup that guarantees to drop hammer Position installs laser displacement sensor along fibre length direction, and hits upward laser positioned at spring pre-tightening fixture block The laser reflection piece of lateral surface, release is dropped hammer to impact the force-bearing steel plate that rushed of the built-up jig, and records related data.
CN201910165389.8A 2019-03-05 2019-03-05 The cohesive force dynamic Hubbing method and built-up jig of fiber cement composites Pending CN109883819A (en)

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CN108669870A (en) * 2018-06-05 2018-10-19 王杰 Office seating
CN108713917A (en) * 2018-06-05 2018-10-30 王杰 Intelligent elevated seat
CN108720395A (en) * 2018-06-05 2018-11-02 王杰 lifting seat
CN108814064A (en) * 2018-06-05 2018-11-16 王杰 Full-automatic lifting seat
CN108851690A (en) * 2018-06-05 2018-11-23 王杰 Automatic lifting chair
CN110487715A (en) * 2019-08-23 2019-11-22 淮阴工学院 A kind of high ductility cement-based material Single fiber pull-out test device and test method

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CN110487715A (en) * 2019-08-23 2019-11-22 淮阴工学院 A kind of high ductility cement-based material Single fiber pull-out test device and test method

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