CN221100239U - Casting die for wedge-type compact tensile fracture test - Google Patents
Casting die for wedge-type compact tensile fracture test Download PDFInfo
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- CN221100239U CN221100239U CN202322987053.4U CN202322987053U CN221100239U CN 221100239 U CN221100239 U CN 221100239U CN 202322987053 U CN202322987053 U CN 202322987053U CN 221100239 U CN221100239 U CN 221100239U
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- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 238000005266 casting Methods 0.000 title claims description 8
- 238000005452 bending Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 19
- 239000000463 material Substances 0.000 description 8
- 238000009864 tensile test Methods 0.000 description 6
- 238000013001 point bending Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- 239000002002 slurry Substances 0.000 description 1
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Abstract
The application provides a pouring die for a wedging type compact tensile fracture test, which comprises a bottom plate, wherein a front side plate and a rear side plate which are arranged in parallel are arranged on the bottom plate, a right side plate and a left side plate are respectively arranged at the direct two ends of the front side plate and the rear side plate, the bottom plate, the front side plate, the right side plate, the left side plate and the rear side plate form a rectangular cavity structure with an upper end opening, a trapezoid block is arranged at an upper port of the rectangular cavity structure, the bottom surface of the trapezoid block faces away from the bottom plate, a precast slit plate is arranged between the front side plate and the rear side plate and is close to the upper port of the rectangular cavity structure, the precast slit plate penetrates through the trapezoid block, two reserved hole pipes are arranged between the front side plate and the rear side plate, the distances between the two reserved hole pipes and the bottom plate are equal, the two reserved hole pipes are symmetrically arranged about the precast slit plate, additional bending moment caused at the tip of a slit is avoided, the stress strain field nearby the precast slit is reduced, and the magnitude of a real fracture toughness value is obtained.
Description
Technical Field
The utility model relates to the field of tensile tests of concrete test pieces, in particular to a pouring die for a wedging type compact tensile fracture test.
Background
The three-point bending beam method, the wedge method and the compact stretching method are three test methods commonly used in material mechanics experiments and are used for evaluating the mechanical properties and strength of materials, and the three-point bending beam method is used for measuring the properties of the materials under bending loading. The sample is placed between two support points and the loading point applies a downward force, and the sample bends. By measuring the deformation and stress of the test specimen, the parameters such as bending stiffness, elastic modulus, breaking strength and the like of the material can be determined. Wedge split methods are used to measure the fracture toughness of a material. The specimen is placed between two support points and the loading point applies an outward force, and crack propagation of the specimen occurs. By measuring the crack propagation length and loading force of the test specimen, the fracture toughness parameters of the material can be determined. Compact stretching methods are used to measure the fracture toughness of materials. The specimen is loaded to create tensile stress and crack propagation occurs at the crack tip in the center of the specimen by loading. By measuring the crack propagation length and loading force of the test specimen, the fracture toughness parameters of the material can be determined.
The accuracy of the concrete fracture parameters measured by the fracture test is generally affected by factors such as the size of the test piece, the type of the test piece, the loading mode and the like. The three-point bending beam method is limited by the span-to-height ratio, the size of a test piece is generally limited, and concrete fracture parameters without size effect are difficult to obtain. The vertical component of the wedge pulling method, which is also loaded, and the dead weight of the test piece may generate additional bending moment at the tip of the crack, thereby affecting the accuracy of the measured fracture parameters. The wedging compact tensile test method is a method for loading a test piece by adopting a standard compact tensile test piece and adopting a wedging split-drawing method so as to complete a fracture test. The compact tensile sample is a standard sample with a notch for fracture initial test, and the tensile load is applied by inserting a pin shaft, compared with other samples with the same test function, the compact tensile sample has smaller volume and compact size, so that when the notch is stretched, the notch can cause stress concentration, and the stress state in front of the notch is changed; the wedging split-pulling method ensures that the loading in the test is more stable so as to ensure more objective and accurate test data, and the wedging compact tensile test method combines the characteristics of the wedging split-pulling method and the compact tensile method, thereby not only eliminating the problem of influence of additional bending moment caused by the tip of a crack on the true value of the fracture parameter in the wedging split-pulling test, but also overcoming the problem of the requirement of the compact tensile test piece on the rigidity of test equipment.
The conventional wedge split-pulling test device can be seen in CN 103900901A as a wedge split-pulling method concrete test device, generally in the conventional wedge split-pulling test, in order to simplify test operation, when wedge split-pulling test pieces with different height dimensions are poured, the loading grooves are basically uniform in the same dimension, which inevitably causes additional bending moment at the crack tips, thereby influencing the magnitude of the true fracture toughness value, and in order to avoid the problems possibly caused by the conventional wedge split-pulling test, a compact tensile fracture test adopting a compact tensile test piece type and a wedge split-pulling loading mode is selected. There is therefore a need for a casting mold for a wedged compact tensile fracture test for casting concrete test pieces.
Disclosure of utility model
The utility model provides a pouring die for a wedging type compact tensile fracture test, which avoids causing additional bending moment at the tip of a crack, reduces the influence of a stress strain field nearby the crack, and further obtains the magnitude of a real fracture toughness value.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a compact tensile fracture test's of wedge type pouring mould, comprising a base plate, be equipped with preceding curb plate and posterior lateral plate of parallel arrangement on the bottom plate, preceding curb plate and posterior lateral plate direct both ends are equipped with right-hand member curb plate and left-hand member curb plate respectively, the bottom plate, preceding curb plate, right-hand member curb plate, left-hand member curb plate and posterior lateral plate constitute upper end open-ended rectangle cavity structure, the port department is equipped with trapezoidal piece on the rectangle cavity structure, trapezoidal piece bottom surface is dorsad bottom plate, still be equipped with prefabricated seam board between preceding curb plate and the posterior lateral plate, prefabricated seam board is close to the last port department of rectangle cavity structure, prefabricated seam board runs through trapezoidal piece, still be equipped with two reservation hole pipes between preceding curb plate and the posterior lateral plate, the distance of two reservation hole pipes and bottom plate equals, two reservation hole pipes are arranged about prefabricated seam board symmetry.
The precast slit plate is double-coated with a release agent before pouring, and after the concrete is solidified, the precast slit plate is left in the center of the concrete test block, but the precast slit plate and the concrete test block have actually lost the connecting force due to the auxiliary effect of the release agent, so the precast slit plate is equivalent to a precast slit.
In the preferred scheme, the opposite side of preceding curb plate and posterior lateral plate respectively is equipped with two at least parallel arrangement's bar groove, and in each bar groove was gone into respectively to right-hand member curb plate and left end curb plate both ends card, be equipped with a plurality of connecting screw rods between the preceding curb plate in right-hand member curb plate and left end curb plate outside and the posterior lateral plate.
The bar-shaped groove is a positioning groove, nuts are arranged at two ends of the connecting screw rod, and the front side plate and the rear side plate are locked.
In the preferred scheme, preceding curb plate and posterior lateral plate one side lower extreme are equipped with fixed connection block, still are equipped with connecting screw, and fixed connection block passes through connecting screw and is connected with the bottom plate.
In the preferred scheme, prefabricated seam board one end is equipped with V type groove, and the trapezoidal piece is equipped with the draw-in groove structure, and the draw-in groove structure card of trapezoidal piece goes into prefabricated seam board's V type groove department.
The beneficial effects of the utility model are as follows: the assembly of a plurality of grooves is beneficial to the relative fixation and sealing among parts, and the rigidity, the firmness and the compactness of the pouring die are ensured; the prefabricated seam plate is provided with the square cone blocks and the steel sheets which are welded into a whole, so that the prefabricated seam plate is convenient to install and detach; the trapezoid blocks are arranged smaller than the bottom plate, so that the compactness of the pouring die is guaranteed; each part has the advantages of simple structure, simple assembly, good tightness, strong operability, good stability and cost saving, simultaneously realizes the direct manufacture of a wedged compact tensile fracture test piece with prefabricated cracks, absorbs the advantages of two typical methods of a compact tensile method and a wedged split-pulling method, provides conditions for the follow-up development of wedged compact tensile fracture tests, researches the influence of each factor on the fracture performance of concrete, and has high popularization value.
Drawings
The utility model is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the overall structure of the present utility model.
Fig. 2 is a schematic structural view of a front side plate of the present invention.
Fig. 3 is a schematic structural view of the base plate of the present utility model.
Fig. 4 is a schematic view of the structure of the left end plate of the present utility model.
FIG. 5 is a schematic view of the assembly of the prefabricated slit plate and trapezoidal block of the present utility model.
Fig. 6 is a rear view of the front side panel of the present utility model.
Fig. 7 is a schematic view of the structure of the front and rear side plates and the bottom plate assembly of the present utility model.
FIG. 8 is a schematic view of a prefabricated slit plate structure of the present utility model.
FIG. 9 is a schematic view of the trapezoid block structure of the present utility model.
In the figure: a base plate 1; a front side plate 2; a fixed connection block 201; a right end side plate 3; a left end side plate 4; a rear side plate 5; prefabricating a slit plate 6; a trapezoid block 601; a connecting screw 7; a connecting screw 8; the perforated pipe 9 is reserved.
Detailed Description
As shown in fig. 1-5, a pouring die for a wedge-type compact tensile fracture test comprises a bottom plate 1, wherein a front side plate 2 and a rear side plate 5 which are arranged in parallel are arranged on the bottom plate 1, a right end side plate 3 and a left end side plate 4 are respectively arranged at the direct two ends of the front side plate 2 and the rear side plate 5, the bottom plate 1, the front side plate 2, the right end side plate 3, the left end side plate 4 and the rear side plate 5 form a rectangular cavity structure with an upper end opening, a trapezoid block 601 is arranged at an upper port of the rectangular cavity structure, the bottom surface of the trapezoid block 601 faces away from the bottom plate 1, a prefabricated seam plate 6 is further arranged between the front side plate 2 and the rear side plate 5, the prefabricated seam plate 6 penetrates through the trapezoid block 601, two reserved hole pipes 9 are further arranged between the front side plate 2 and the rear side plate 5, the distances between the two reserved hole pipes 9 and the bottom plate 1 are equal, and the two reserved hole pipes 9 are symmetrically arranged about the prefabricated seam plate 6.
The left end plate 4 and the right end plate 3 are arranged in parallel, the left end plate 4 and the right end plate 3 are just embedded into the grooves in the middle of the openings at the two ends of the front side plate 2 and the rear side plate 5, preliminary mutual fixation is achieved, the left end plate 4 slides into the grooves embedded into the bottom plate 1 along the grooves of the front side plate 2 and the rear side plate 5, the joint of the front side plate, the rear side plate, the left end plate, the right end plate and the bottom plate is more compact, slurry leakage is difficult, the prefabricated seam plate 6 is fixed between the front side plate 2 and the rear side plate 5, the trapezoid blocks 601 are placed in the grooves of the prefabricated seam plate 6, concrete is poured, the trapezoid blocks 601 are taken out during form removal, and the trapezoid grooves are formed by concrete test pieces.
The precast slit plate 6 is double-sided brushed with a release agent before pouring, and after the concrete is solidified, the precast slit plate 6 remains in the center of the concrete test block, but the precast slit plate 6 and the concrete test block have actually lost the connecting force due to the auxiliary effect of the release agent, so the precast slit plate is equivalent to a precast slit.
Four holes are correspondingly formed in the front, the rear, the left and the right of the bottom plate 1, the corresponding fixing plates of the front side plate 2 and the rear side plate 5 are aligned with the corresponding holes, and the front side plate 2, the rear side plate 5 and the bottom plate 1 are primarily fixed by connecting screws.
The right end plate 3 is inserted into the grooves of the bottom plate 1 along the grooves of the front side plate 2 and the rear side plate 5, and the front side plate 2, the rear side plate 5 and the right end plate 3 are fixed together by bolts.
And (3) screwing the connecting screw and the connecting screw rod to ensure that the die is compact and each joint is tight.
In the preferred scheme, the opposite side of front side board 2 and posterior lateral board 5 respectively is equipped with two at least parallel arrangement's bar groove, and right-hand member curb plate 3 and left-hand member curb plate 4 both ends card respectively go into each bar groove, are equipped with a plurality of connecting screw rods 7 between the outside front side board 2 of right-hand member curb plate 3 and left-hand member curb plate 4 and posterior lateral board 5.
The bar-shaped groove is a positioning groove, nuts are arranged at two ends of the connecting screw rod 7, and the front side plate 2 and the rear side plate 5 are locked.
In a preferred scheme, the lower ends of one side of the front side plate 2 and the rear side plate 5 are provided with fixed connecting blocks 201, and are also provided with connecting screws 8, and the fixed connecting blocks 201 are connected with the bottom plate 1 through the connecting screws 8.
In the preferred scheme, prefabricated seam board 6 one end is equipped with V type groove, and trapezoidal piece 601 is equipped with the draw-in groove structure, and the draw-in groove structure card of trapezoidal piece 601 goes into prefabricated seam board 6's V type groove department.
The front side plate 2 and the rear side plate 5 are respectively provided with a groove at the corresponding middle position, the prefabricated slit plate 6 is inserted opposite to the grooves in the middle of the front side plate 2 and the rear side plate 5, and the trapezoid blocks 601 are placed in the grooves of the prefabricated slit plate 6, so that a concrete test piece required for a test can be obtained.
The preformed hole pipe 9 is inserted into the preformed holes of the front side plate 2 and the rear side plate 5, and then the preformed hole pipe 9 is firmly fixed in the preformed holes by using nuts.
The front side plate 2, the rear side plate 5 and the bottom plate 1 are respectively provided with grooves, and the left side end plate 4 and the right side end plate 3 are respectively inserted into the grooves and are connected and fixed with the front side plate 2, the rear side plate 5 and the bottom plate 1 into a whole; the arrangement ensures that the left side end plate 4 and the right side end plate 3 are connected with the front side plate 2 and the rear side plate 5 more firmly and tightly, and further ensures the compactness of the pouring test piece.
The front side plate 2 and the bottom plate 1, the rear side plate 5 and the bottom plate 1 are fixedly connected through a right-angle fixed connecting block and a bolt, and the joint is tight.
The prefabricated slit plate is provided with a trapezoid groove, a steel knife with the thickness of 2mm and the inclination angle of 15 degrees is inserted before pouring of a die, then the trapezoid block groove is embedded opposite to the trapezoid groove, the trapezoid block is taken out after pouring is completed, the trapezoid groove is formed, and the trapezoid block is placed into the clamp type extensometer during test; by the arrangement, the additional bending moment is avoided at the tip of the crack, the influence of a stress strain field nearby the crack is reduced, and therefore the magnitude of the real fracture toughness value is obtained.
The above embodiments are only preferred embodiments of the present utility model, and should not be construed as limiting the present utility model, and the scope of the present utility model should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this utility model are also within the scope of the utility model.
Claims (4)
1. A casting die for a wedge-type compact tensile fracture test is characterized in that: including bottom plate (1), be equipped with preceding curb plate (2) and posterior lateral plate (5) of parallel arrangement on bottom plate (1), preceding curb plate (2) and posterior lateral plate (5) direct both ends are equipped with right-hand member curb plate (3) and left end curb plate (4) respectively, bottom plate (1), preceding curb plate (2), right-hand member curb plate (3), left-hand member curb plate (4) and posterior lateral plate (5) constitute upper end open-ended rectangle cavity structure, port department is equipped with trapezoidal piece (601) on the rectangle cavity structure, trapezoidal piece (601) bottom surface dorsad bottom plate (1), still be equipped with prefabricated slit plate (6) between preceding curb plate (2) and posterior lateral plate (5), prefabricated slit plate (6) are close to rectangle cavity structure upper port department, prefabricated slit plate (6) run through trapezoidal piece (601), still be equipped with two reservation hole pipes (9) between preceding curb plate (2) and the posterior lateral plate (5), the distance of two reservation hole pipes (9) and bottom plate (1) equals, two reservation hole pipes (9) are about prefabricated slit plate (6) symmetrical arrangement.
2. The casting mold for a wedge-type compact tensile fracture test according to claim 1, wherein: at least two parallel arranged strip-shaped grooves are respectively arranged on one side, opposite to the front side plate (2) and the rear side plate (5), of each of the two ends of the right end side plate (3) and the left end side plate (4) are respectively clamped into the corresponding strip-shaped grooves, and a plurality of connecting screws (7) are arranged between the front side plate (2) and the rear side plate (5) on the outer sides of the right end side plate (3) and the left end side plate (4).
3. The casting mold for a wedge-type compact tensile fracture test according to claim 1, wherein: the lower ends of one side of the front side plate (2) and one side of the rear side plate (5) are provided with fixed connecting blocks (201), and are also provided with connecting screws (8), and the fixed connecting blocks (201) are connected with the bottom plate (1) through the connecting screws (8).
4. The casting mold for a wedge-type compact tensile fracture test according to claim 1, wherein: one end of the prefabricated slit plate (6) is provided with a V-shaped groove, the trapezoid block (601) is provided with a clamping groove structure, and the clamping groove structure of the trapezoid block (601) is clamped into the V-shaped groove of the prefabricated slit plate (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322987053.4U CN221100239U (en) | 2023-11-06 | 2023-11-06 | Casting die for wedge-type compact tensile fracture test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322987053.4U CN221100239U (en) | 2023-11-06 | 2023-11-06 | Casting die for wedge-type compact tensile fracture test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221100239U true CN221100239U (en) | 2024-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322987053.4U Active CN221100239U (en) | 2023-11-06 | 2023-11-06 | Casting die for wedge-type compact tensile fracture test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221100239U (en) |
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2023
- 2023-11-06 CN CN202322987053.4U patent/CN221100239U/en active Active
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