CN219416989U - Plate negative stress ratio high-temperature crack propagation test fixture - Google Patents
Plate negative stress ratio high-temperature crack propagation test fixture Download PDFInfo
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- CN219416989U CN219416989U CN202222871008.8U CN202222871008U CN219416989U CN 219416989 U CN219416989 U CN 219416989U CN 202222871008 U CN202222871008 U CN 202222871008U CN 219416989 U CN219416989 U CN 219416989U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model discloses a plate negative stress ratio high-temperature crack propagation test fixture, which comprises two pairs of clamping plates for clamping a plate sample, positioning nuts arranged in each pair of clamping plates, and a pair of pull rods fixedly connected with the positioning nuts at two sides of each clamping plate, wherein each pair of clamping plates is provided with a plurality of pairs of through holes which are penetrated up and down, and the through holes comprise four pairs of first through holes positioned at the inner side and the outer side of the clamping plate; a pair of second through holes positioned in the middle of the clamping plate; the middle part of the positioning nut is provided with a positioning screw hole corresponding to the positioning screw hole, and one end of the pull rod connected with the positioning nut is provided with external threads so as to be in threaded connection with the positioning nut. According to the utility model, through clamping plate fixation and positioning nut switching, the space limitations of the sample size, the fatigue testing machine and the environment box can be successfully avoided, and the negative stress ratio high-temperature crack propagation test of the plate samples with different materials and thicknesses is realized.
Description
Technical Field
The utility model belongs to the technical field of high-temperature fatigue tests, and particularly relates to a clamp for a high-temperature crack propagation test of a plate with negative stress.
Background
In modern production and life, various metal and nonmetal materials, especially novel materials, are widely applied in various industries, and higher requirements are put on the fatigue characteristics of materials besides the requirements on the static characteristics such as the strength, the rigidity and the like of the materials. Besides theoretical calculation and simulation analysis, the most reliable method is to test and examine the fatigue characteristics of the material, and an electrohydraulic servo fatigue testing machine is commonly used. However, in general, the electrohydraulic servo fatigue tester is at normal temperature, and when the sample is to be tested at high temperature, an environmental box (high temperature box) is additionally added, and the sample is heated to a predetermined temperature in the environmental box and then the test is started.
The electrohydraulic servo fatigue testing machine is at normal temperature, the temperature of a clamping block for clamping a sample cannot be raised higher, and the common solution is to open a hole in the clamping block for water cooling. In some cases, due to space limitations of sample size, fatigue testing machine and environmental box, the testing machine cannot directly clamp the sample, and needs to be switched through a clamp: the clamp block of the testing machine clamps the clamp, and the clamp clamps the test piece. The high-temperature crack extension test is used for checking the high-temperature fatigue performance of the test sample, but when the negative stress ratio is required for the test sample with the shape of the plate, the common clamp in the common form is difficult to meet the requirement.
Disclosure of Invention
The utility model aims to provide a switching fixture device between a sample and a clamping block of a testing machine, aiming at the demand characteristics of a plate shape sample in a high-temperature crack propagation test of negative stress ratio.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a panel negative stress is than high temperature crack growth test fixture, includes two pairs of splint that are used for the centre gripping panel sample, sets up the locating nut in every pair of splint, and in the both sides of splint with locating nut fixed connection's a pair of pull rod, every pair all offer a plurality of pairs of through-holes that link up from top to bottom on the splint, include:
four pairs of first through holes positioned at the inner side and the outer side of the clamping plate are used for clamping and fixing through a first bolt and a first nut so as to apply a pressing force to the clamped sample to obtain a corresponding friction force, thereby fixing the sample; and
the second through holes are positioned in the middle of the clamping plate and are used for positioning the sample through the second bolts and the second nuts;
the middle part of the positioning nut is provided with a positioning screw hole corresponding to the positioning screw hole, and one end of the pull rod connected with the positioning nut is provided with external threads so as to be in threaded connection with the positioning nut.
According to the utility model, the sample is provided with a positioning hole at a position corresponding to the second bolt, and the second bolt is penetrated in the positioning hole.
According to the utility model, the positioning nut is arranged in the clamping plate at a position close to the outer side so as to be connected with the pull rod.
According to the utility model, the positioning nut is approximately in a cuboid configuration, the clamping plate is provided with the containing holes which are penetrated from top to bottom, and the configuration of the containing holes is matched with that of the positioning nut, so that the positioning nut is positioned in the clamping plate.
Further, a pair of lugs is further arranged on the inner side and the outer side of the positioning nut and used for limiting the positioning nut in the accommodating hole and preventing the positioning nut from falling out of the accommodating hole.
According to a preferred embodiment, the auxiliary tool is further configured, and the auxiliary tool comprises a bottom plate and side plates arranged on two sides of the bottom plate, so that a containing space is formed between the bottom plate and the side plates, the containing space is matched with the configuration of the clamping plate, and corresponding slotted holes are formed in the bottom plate at positions corresponding to the first nut and the second nut, so that the installation of the bolts and the nuts is facilitated.
The plate negative stress ratio high-temperature crack extension test clamp disclosed by the utility model is fixed by the clamping plate and is connected with the positioning nut, so that the space limitations of a sample size, a fatigue testing machine and an environment box can be successfully avoided, and the negative stress ratio high-temperature crack extension test of plate samples with different materials and thicknesses is realized.
Drawings
FIG. 1 is an overall schematic diagram of a panel negative stress versus high temperature crack growth test fixture of the present utility model.
Fig. 2 is a schematic view of a partial explosion of fig. 1.
Fig. 3 is a schematic diagram of an auxiliary tool.
Fig. 4 is a schematic diagram of the sample after loading using the auxiliary tool.
Description of the figure:
1-a sample; 2-a first bolt; 3-a first nut; 4-a second bolt; 5-a second nut; 6, positioning holes; 10-clamping plates; 11-a first through hole; 12-a second through hole; 13-accommodating holes; 20-positioning a nut; 21-positioning screw holes; 22-ear; 30-pulling a rod; 40-auxiliary tools; 41-a bottom plate; 42-side plates; 43-accommodating space; 44-slots.
Detailed Description
The technical scheme of the utility model is clearly and completely described in the following by specific embodiments with reference to the accompanying drawings. It is to be understood that the described embodiments are only some, but not all, of the embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
The terms "front", "rear", "left", "right", "upper", "lower" and the like in the following examples are used for the purpose of illustration only in conjunction with the drawings and do not represent the only embodiments
As shown in fig. 1 and 2, the plate negative stress ratio high temperature crack propagation test fixture of the present utility model comprises two pairs of clamping plates 10 for clamping a plate sample 1, a positioning nut 20 disposed in each pair of clamping plates 10, and a pair of tie rods 30 fixedly connected with the positioning nut 20 at both sides of the clamping plates 10, wherein each pair of clamping plates 10 is provided with a plurality of pairs of through holes penetrating up and down, and the fixture comprises:
four pairs of first through holes 11 located at both inner and outer sides of the clamping plate 10 for clamping and fixing by a first bolt (high temperature bolt) 2 and a first nut (high temperature nut) 3 to apply a pressing force to the clamped sample 1 to obtain a corresponding friction force, thereby fixing the sample 1; and
a pair of second through holes 12 located at the middle of the clamping plate 10 for positioning the sample 1 by the second bolts 4 and the second nuts 5;
the middle part of the positioning nut 20 is provided with a positioning screw hole 21, and one end of the pull rod 30 connected with the positioning nut 20 is provided with external threads so as to be in threaded connection with the positioning nut 20.
Further, a positioning hole 6 is formed in the sample 1 at a position corresponding to the second bolt 4, and the second bolt 4 is inserted into the positioning hole 6.
Further, the positioning nut 20 is disposed in the clamping plate 10 near the outer side so as to be connected to the pull rod 30. As shown in fig. 2, the positioning nut 20 has a substantially rectangular parallelepiped configuration, the clamping plate 10 is provided with a receiving hole 13 penetrating therethrough from top to bottom, and the receiving hole 13 has a configuration matching with the positioning nut 20, so that the positioning nut 20 is positioned in the clamping plate 10. Preferably, a pair of ears 22 are further disposed on the inner and outer sides of the positioning nut 20, for limiting the positioning nut 20 in the accommodating hole 13, so as to prevent the positioning nut from falling out of the accommodating hole 13.
As shown in fig. 3, the plate negative stress ratio high-temperature crack propagation test fixture of the present utility model may further be provided with an auxiliary fixture 40, where the auxiliary fixture 40 includes a bottom plate 41 and side plates 42 disposed on two sides of the bottom plate 41, so that a receiving space 43 is formed between the bottom plate 41 and the side plates 42, the receiving space 43 is matched with the configuration of the clamping plate 10, and corresponding slots 44 are provided on the bottom plate 41 at positions corresponding to the first nut 3 and the second nut 5, so as to facilitate installation of bolts and nuts. In this way, the process of loading the sample 1 can be completed in the auxiliary tool 40, so as to facilitate the loading of the sample 1.
The loading process of the plate negative stress test clamp is as follows:
1. positioning and placing the first nut 3, the second nut 5 and the lower clamping plate 10 on the bottom plate 41 by means of the auxiliary tool 40;
2. placing the sample 1 and the positioning nut 20 on the lower-layer bottom plate 10, and then placing the sample on the upper-layer clamping plate 10;
3. penetrating a first bolt 2 and a second bolt 4 into the upper clamping plate 10 and the lower clamping plate 10, and sleeving a corresponding first nut 3 and a corresponding second nut 5;
4. the threaded end of the pull rod 30 is screwed into the positioning screw hole 21 of the positioning nut 20 in the clamping plate 10, and is pre-tightened properly;
5. a fixed torque wrench is adopted to drive to proper torque so as to obtain corresponding friction force;
6. and after the fixing is finished, the test piece is taken out of the auxiliary tool 40 and is put into an environment box of the testing machine.
The working principle of the utility model is as follows:
two pairs of clamping plates 10 clamp two ends of the plate sample 1 respectively, and a first bolt 2 is screwed to apply a compaction force to obtain a corresponding friction force, so that the sample 1 is fixed; the positioning nut 20 can adapt to the positioning of plate samples with different thicknesses, ensures that the center line of the sample coincides with the loading center line of the testing machine, and realizes the combined compaction and fixation with the clamping plate 10 through the threaded connection with the pull rod 30 so as to meet the requirement of loading with a negative stress ratio; the pull rod 30 plays a role in transmission, and extends into the clamping blocks of the testing machine after being led out from the environment box, so that the whole set of clamp is fixed, and the requirement of the plate negative stress ratio high-temperature crack propagation test under the condition of limited space is met.
The plate negative stress ratio high-temperature crack extension test clamp disclosed by the utility model is fixed by the clamping plate and is connected with the positioning nut, so that the space limitations of a sample size, a fatigue testing machine and an environment box can be successfully avoided, and the negative stress ratio high-temperature crack extension test of plate samples with different materials and thicknesses is realized.
Claims (6)
1. The utility model provides a panel negative stress is than high temperature crack propagation test fixture, its characterized in that, including two pairs of splint that are used for the centre gripping panel sample, set up the locating nut in every pair of splint, and in the both sides of splint with locating nut fixed connection's a pair of pull rod, every pair all offer a plurality of pairs of through-holes that link up from top to bottom on the splint, include:
four pairs of first through holes positioned at the inner side and the outer side of the clamping plate are used for clamping and fixing through a first bolt and a first nut so as to apply a pressing force to the clamped sample to obtain a corresponding friction force, thereby fixing the sample; and
the second through holes are positioned in the middle of the clamping plate and are used for positioning the sample through the second bolts and the second nuts;
the middle part of the positioning nut is provided with a positioning screw hole corresponding to the positioning screw hole, and one end of the pull rod connected with the positioning nut is provided with external threads so as to be in threaded connection with the positioning nut.
2. The fixture for testing the negative stress of the plate material as claimed in claim 1, wherein the sample is provided with a positioning hole at a position corresponding to the second bolt, and the second bolt is penetrated in the positioning hole.
3. The fixture of claim 1, wherein the retaining nut is positioned inside the clamping plate at a location near the outside for connection to the tie rod.
4. The fixture for testing the propagation of negative stress of a plate material to high temperature cracks according to claim 1, wherein the positioning nut is in a substantially rectangular parallelepiped configuration, and the clamping plate is provided with a through-going accommodation hole, the configuration of which is matched with that of the positioning nut, so that the positioning nut is positioned in the clamping plate.
5. The fixture for testing the negative stress of the plate material as claimed in claim 4, wherein a pair of lugs are further arranged on the inner side and the outer side of the positioning nut for limiting the positioning nut in the accommodating hole and preventing the positioning nut from falling out of the accommodating hole.
6. The fixture for testing the negative stress of the plate material according to claim 1, further comprising an auxiliary tool, wherein the auxiliary tool comprises a bottom plate and side plates arranged on two sides of the bottom plate, so that a containing space is formed between the bottom plate and the side plates, the containing space is matched with the configuration of the clamping plate, and corresponding slotted holes are formed in the bottom plate at positions corresponding to the first nut and the second nut, so that the installation of the bolts and the nuts is facilitated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222871008.8U CN219416989U (en) | 2022-10-28 | 2022-10-28 | Plate negative stress ratio high-temperature crack propagation test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222871008.8U CN219416989U (en) | 2022-10-28 | 2022-10-28 | Plate negative stress ratio high-temperature crack propagation test fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219416989U true CN219416989U (en) | 2023-07-25 |
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ID=87231893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222871008.8U Active CN219416989U (en) | 2022-10-28 | 2022-10-28 | Plate negative stress ratio high-temperature crack propagation test fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219416989U (en) |
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2022
- 2022-10-28 CN CN202222871008.8U patent/CN219416989U/en active Active
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