CN109030194B - Assembled fixture for fatigue crack growth rate test - Google Patents
Assembled fixture for fatigue crack growth rate test Download PDFInfo
- Publication number
- CN109030194B CN109030194B CN201810864472.XA CN201810864472A CN109030194B CN 109030194 B CN109030194 B CN 109030194B CN 201810864472 A CN201810864472 A CN 201810864472A CN 109030194 B CN109030194 B CN 109030194B
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- 238000012360 testing method Methods 0.000 title claims abstract description 87
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000009864 tensile test Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000009661 fatigue test Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application discloses an assembled clamp for testing fatigue crack propagation rate, which comprises a clamp body, a pin shaft supporting piece, a test piece clamping piece and a pin shaft, wherein one end of the clamp body is provided with a connecting piece used for being fixedly connected with a testing machine, the other end of the clamp body is provided with a U-shaped clamping part, a U-shaped opening of the U-shaped clamping part faces away from the connecting piece, and two lugs of the U-shaped clamping part are provided with mounting holes; the pin shaft support piece is detachably arranged in the mounting hole, and is provided with a pin shaft mounting hole; the test piece clamping piece used for clamping the test piece in the thickness direction is detachably arranged in the U-shaped opening, and the test piece clamping piece is U-shaped; and two ends of the pin shaft are supported in the pin shaft mounting holes. The application has good applicability to compact tensile test pieces with different sizes, and the installation and the disassembly of each component are very convenient and flexible. The device has simple structure, convenient operation, low manufacturing cost and strong safety.
Description
Technical Field
The application relates to the technical field of fatigue crack growth rate tests, in particular to an assembled fixture for fatigue crack growth rate tests.
Background
In the aspect of metal material testing, the fatigue crack growth rate is an important parameter reflecting the fatigue performance of the metal material. In the testing process, the material to be tested is usually processed into a standard compact tensile test piece, and then fatigue crack growth rate is tested. Detailed test procedures and methods are explicitly required in Specification Standard test method for measurement of fatigue crack growth rates. As shown in fig. 1, the test piece is generally rectangular, a machining notch is provided in the middle of the test piece in the length direction, the notch extends from one side edge toward the inside of the test piece, the extending direction of the notch is parallel to the width direction of the test piece, and fixing holes for fixing the test piece are symmetrically provided with respect to the notch. The loading clamp required by the existing fatigue crack growth rate test is used for processing clamps matched with the loading clamp according to a test piece with a certain specific size, so that the adjustability of the loading clamp for compact tensile test pieces with different sizes is poor, the application range is limited, when the test needs to be carried out on the test pieces with different sizes (different fixed hole diameters and different test piece thicknesses), the whole clamp is required to be completely removed to replace a new clamp which is matched with the loading clamp, the operation efficiency is low, and the whole clamp equipment is arranged for the test pieces with different sizes, so that the test cost is not beneficial to being saved. In addition, the existing loading clamps are mostly integrated, have no free installation and disassembly functions, are inconvenient to store, and have to be further improved in assemblability.
Disclosure of Invention
In order to solve the problems in the prior art, the application provides the assembled type fatigue crack growth rate testing fixture which is economical and feasible, strong in practicability and convenient to use. The specific technical scheme is as follows.
The assembled clamp for testing the fatigue crack propagation rate comprises a clamp body, wherein one end of the clamp body is provided with a connecting piece used for being connected and fixed with a testing machine, the other end of the clamp body is provided with a U-shaped clamping part, a U-shaped opening of the U-shaped clamping part faces away from the connecting piece, and two lugs of the U-shaped clamping part are provided with mounting holes; the fixture is characterized by further comprising:
the pin shaft support piece is detachably arranged in the mounting hole and is provided with a pin shaft mounting hole;
the test piece clamping piece is detachably arranged in the U-shaped opening and used for clamping a test piece in the thickness direction, and the test piece clamping piece is U-shaped; and the two ends of the pin shaft are supported in the pin shaft mounting hole.
By adopting the assembled clamp, the two ends of the pin shaft are supported in the two pin shaft mounting holes after the pin shaft passes through the fixing holes of the test piece for testing the fatigue crack propagation rate, the test piece clamping piece clamps the test piece in the thickness direction, the test piece is ensured to be stably and reliably fixed on the clamp body, the pin shaft supporting piece and the test piece clamping piece are detachably arranged on the clamp body, when the test piece with different sizes is required to be tested, the proper pin shaft supporting piece and the test piece clamping piece can be quickly replaced, the whole clamp is not required to be replaced, the operation efficiency is improved, and the cost of the clamp can be greatly reduced.
Further, the pin shaft support piece is cylindrical, the outer contour of the pin shaft support piece is matched with the inner contour of the mounting hole, and the inner diameter of the pin shaft mounting hole is matched with the outer diameter of the pin shaft.
Further, the outer contour of the test piece clamping piece is matched with the inner contour of the U-shaped clamping part, and the width of the U-shaped opening of the test piece clamping piece is matched with the thickness of the test piece.
Further, a T-shaped protrusion extending along the axial direction is arranged on the outer wall of the pin shaft support piece, and a T-shaped groove matched with the T-shaped protrusion is arranged on the side wall of the mounting hole. The cooperation of T type groove and T type protruding can be better with round pin axle support detachably setting up in the mounting hole of U type clamping part.
Further, a T-shaped protrusion is arranged on the outer wall of the test piece clamping piece, and a T-shaped groove matched with the T-shaped protrusion is arranged on the inner wall of the U-shaped clamping part. The T-shaped groove and the T-shaped protrusion are matched to enable the test piece clamping piece to be detachably arranged in the U-shaped opening of the U-shaped clamping portion.
Further, two ends of the pin shaft protrude out of the outer sides of the two lugs of the U-shaped clamping part respectively, and the two ends are provided with limiting pieces in a penetrating mode. The limiting piece can be a slender part such as a steel wire, can limit the axial movement of the pin shaft, and ensures the stability of the test piece in the test process.
Further, the T-shaped groove on the side wall of the mounting hole is shielded by the test piece holder. So set up, test piece holder can prevent that the round pin axle support from sliding out from the inside.
The clamp has the technical effects that the clamp has good applicability to compact tensile test pieces with different sizes when a fatigue crack propagation test is carried out, and the installation and the disassembly of each component are very convenient and flexible. The device has simple structure, convenient operation, low manufacturing cost and strong safety.
Drawings
FIG. 1 is a schematic illustration of a test piece for fatigue crack growth rate testing;
FIG. 2 is an overall operation schematic and an exploded schematic of the present application;
FIG. 3 is a schematic view of the appearance and perspective of the clamp body;
FIG. 4 is a schematic view of the use of a pin support, test piece holder;
fig. 5 is a schematic diagram of the popularization of the complete equipment of the application.
In the figure: 1-connecting piece, 2-anchor clamps body, 3-round pin axle support piece, 4-test piece holder, 5-round pin axle, 6-steel wire, 7-flattening auxiliary member, 8-test piece, 9-U-clamping part, 91-tab, 10-mounting hole.
Detailed Description
The application is described in further detail below with reference to the accompanying drawings.
Referring to fig. 2 to 5, the upper and lower ends of the test piece 8 are respectively clamped and fixed by two jigs, which are identical, and the upper jigs will be mainly described below. The clamp mainly comprises a clamp body 2, a pin shaft supporting piece 3, a test piece clamping piece 4 and a pin shaft 5.
The fixture body 2 is mainly used for bearing and transmitting loading load of the fatigue testing machine, one end (upper end) of the fixture body is provided with a connecting piece 1 used for being connected and fixed with the fatigue testing machine (not shown), the connecting piece 1 can be a screw, the screw and the fixture body 2 are connected into a whole through threads, and one end of the screw is fixed on the testing machine during testing; the other end (lower end) of the clamp body 2 is provided with a U-shaped clamping part 9, and it can be understood that the U-shaped clamping part 9 can be integrally formed with the clamp body 2, or can be fixed at the lower end of the clamp body 2 through a fastener, the U-shaped opening of the U-shaped clamping part 9 is opposite to the connecting piece 1, and two lugs 91 of the U-shaped clamping part 9 are provided with penetrating mounting holes 10.
The two pin shaft supports 3 are detachably arranged in the two mounting holes 10, and the pin shaft supports 3 are provided with pin shaft mounting holes penetrating through; preferably, the pin support 3 is cylindrical, the outer contour of the pin support 3 matches the inner contour of the mounting hole 10, and the inner diameter of the pin mounting hole matches the outer diameter of the pin 5. To accommodate test pieces of different sizes, the pin mounting hole inner diameter of the pin support 3 includes various sizes and is matched with the pins 5 of different diameters, as shown in fig. 5. The diameter range of the pin shaft 5 is 4-20 mm, the size range meets the value range of the aperture of the compact tensile test piece, and the size of the pin shaft is according to the cylindrical pin quenched steel and martensitic stainless steel GB/T119.2-2000. It will be appreciated that the outer profile of the pin support 3 may be circular, polygonal or otherwise, with matching meaning identical in shape and dimensions, such as: the pin support 3 is in clearance fit or transition fit with the mounting hole 10. The middle part of the pin shaft 5 passes through the fixing hole of the test piece 8, the two ends of the pin shaft 5 are respectively supported in the two pin shaft mounting holes, and the outer diameter of the pin shaft 5 is matched with the fixing hole of the test piece 8.
The test piece holder 4 detachably sets up in the U type opening of U type clamping part 9, and the outline of test piece holder 4 and the interior profile phase-match of U type clamping part 9, and test piece holder 4 is the U type, and its U type open-ended width and the thickness phase-match of test piece 8, and test piece holder 4 is used for centre gripping test piece 8 in the thickness direction, restriction test piece 8 at the epaxial motion of round pin axle 5. The long arm thickness of the specimen holder 4 contains a variety of dimensions, as shown in fig. 5. The width of the U-shaped opening of the test piece clamping piece 4 is 4-15 mm, and the size range meets the value range of the thickness of the compact tensile test piece. The fixture device is suitable for the requirements of fatigue crack propagation tests of compact tensile test pieces with different sizes by combining the pin shaft supporting piece 3 and the pin shaft 5. In addition, the fixture device is very convenient and flexible to install and detach, and can be stored only by using a small tool box, and the complete equipment of the fixture device is popularized as shown in fig. 5. The fixture device has strong applicability and convenient and quick operation, and can reduce the use cost and the maintenance cost, when any one of the assembly pin shaft supporting piece 3, the test piece clamping piece 4 and the pin shaft 5 is damaged, the whole fixture is not required to be maintained or replaced, and only the damaged small part is required to be replaced.
Preferably, the top of the mounting hole 10 is provided with a T-shaped groove, the top of the pin support 3 is provided with a T-shaped protrusion, and the T-shaped protrusion at the top of the pin support 3 is matched with the T-shaped groove at the top of the mounting hole 10. The co-operation of the pin support 3 with the clamp body 2 is shown in figure 4. It should be noted that the number of the T-shaped grooves may be one or more than two; the T-shaped groove may be provided on the side or lower portion of the mounting hole 10.
Preferably, two T-shaped grooves are formed in the top of the U-shaped opening of the U-shaped clamping portion 9, two T-shaped protrusions are formed in the top of the test piece clamping member 4, and the T-shaped protrusions of the test piece clamping member 4 are matched with the T-shaped grooves of the U-shaped clamping portion 9. The co-operation of the specimen holder 4 with the clamp body 2 is shown in fig. 4. It should be noted that the number of the T-shaped grooves may be one or more than three; the T-shaped groove may be provided on the side of the U-shaped opening of the U-shaped clamp 9.
To ensure safe use of the jig, steel wires 6 (stoppers) pass through the fine holes at both ends of the pin 5, preventing the pin 5 and the pin support 3 from slipping out to the outside during the test, as shown in fig. 2. The length of the specimen holder 4 blocks the T-shaped slot at the top of the mounting hole 10, preventing the pin support 3 from sliding out inwardly as shown in fig. 4.
In order to improve the test accuracy, it is ensured that the upper and lower clamps are aligned on the same straight line when the test piece is tested, and a leveling aid 7 may be further provided, the leveling aid 7 having a groove provided along the straight line, the groove simultaneously clamping the tabs 91 of the upper and lower clamps.
The embodiments of the present application have been described above with reference to the accompanying drawings, and the embodiments of the present application and the features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "top" and "bottom" as used herein refer only to the direction of the drawing figures, and are not meant to be limiting. The present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the application and the scope of the appended claims, which are all within the scope of the application.
Claims (7)
1. The assembled clamp for testing the fatigue crack propagation rate comprises a clamp body (2), wherein one end of the clamp body (2) is provided with a connecting piece (1) used for being connected and fixed with a testing machine, the other end of the clamp body is provided with a U-shaped clamping part (9), a U-shaped opening of the U-shaped clamping part (9) is opposite to the connecting piece (1), and two lugs (91) of the U-shaped clamping part (9) are provided with mounting holes (10); the fixture is characterized by further comprising:
a pin shaft support (3) detachably arranged in the mounting hole (10), wherein the pin shaft support (3) is provided with a pin shaft mounting hole;
the test piece clamping piece (4) is detachably arranged in the U-shaped opening and used for clamping a test piece (8) in the thickness direction, and the test piece clamping piece (4) is U-shaped; the two ends of the pin shaft (5) are supported in the pin shaft mounting hole, and the pin shaft (5) penetrates through the fixing hole of the test piece;
the pin shaft supporting piece (3), the pin shaft (5) and the test piece clamping piece (4) are all provided with various sizes so as to adapt to test pieces with different sizes.
2. The jig according to claim 1, wherein the pin support (3) is cylindrical, the outer contour of the pin support (3) matches the inner contour of the mounting hole (10), and the inner diameter of the pin mounting hole matches the outer diameter of the pin (5).
3. A mounting fixture for fatigue crack growth rate testing according to claim 1, characterized in that the outer contour of the specimen holder (4) matches the inner contour of the U-shaped holder (9), the width of the U-shaped opening of the specimen holder (4) matching the thickness of the specimen (8).
4. A mounting fixture for fatigue crack growth rate testing according to claim 1 or 2, characterized in that the outer wall of the pin support (3) is provided with a T-shaped protrusion extending in axial direction, and the side wall of the mounting hole (10) is provided with a T-shaped groove matching the T-shaped protrusion.
5. A mounting fixture for fatigue crack growth rate testing according to claim 1 or 3, characterized in that the outer wall of the specimen holder (4) is provided with a T-shaped protrusion, and the inner wall of the U-shaped holder (9) is provided with a T-shaped groove matching the T-shaped protrusion.
6. The assembly fixture for fatigue crack growth rate testing according to claim 1, wherein two ends of the pin shaft (5) protrude from the outer sides of two lugs (91) of the U-shaped clamping part (9), and a limiting piece is arranged on each end in a penetrating manner.
7. A mounting fixture for fatigue crack growth rate testing according to claim 4, characterized in that the T-shaped slot on the side wall of the mounting hole (10) is blocked by the specimen holder (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810864472.XA CN109030194B (en) | 2018-08-01 | 2018-08-01 | Assembled fixture for fatigue crack growth rate test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810864472.XA CN109030194B (en) | 2018-08-01 | 2018-08-01 | Assembled fixture for fatigue crack growth rate test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109030194A CN109030194A (en) | 2018-12-18 |
| CN109030194B true CN109030194B (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810864472.XA Active CN109030194B (en) | 2018-08-01 | 2018-08-01 | Assembled fixture for fatigue crack growth rate test |
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| CN (1) | CN109030194B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109724873B (en) * | 2019-01-30 | 2020-06-19 | 北京航空航天大学 | CT sample crack propagation test fixture suitable for tension and compression loads |
| CN113959833B (en) * | 2021-09-09 | 2024-06-25 | 中国航发南方工业有限公司 | U-shaped clamp device for fatigue crack propagation C (T) sample |
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| CN109030194A (en) | 2018-12-18 |
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Inventor after: Ma Yafei Inventor after: Zhang Jianren Inventor after: Guo Zhongzhao Inventor after: Wang Lei Inventor after: Peng Jianxin Inventor before: Zhang Jianren Inventor before: Ma Yafei Inventor before: Guo Zhongzhao Inventor before: Wang Lei Inventor before: Peng Jianxin |
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