CN110763555A - Three-point bending fatigue test fixture supporting negative stress ratio - Google Patents
Three-point bending fatigue test fixture supporting negative stress ratio Download PDFInfo
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- CN110763555A CN110763555A CN201911125914.XA CN201911125914A CN110763555A CN 110763555 A CN110763555 A CN 110763555A CN 201911125914 A CN201911125914 A CN 201911125914A CN 110763555 A CN110763555 A CN 110763555A
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- plate
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- tightening
- bearing
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 16
- 230000009429 distress Effects 0.000 title claims abstract description 12
- 238000013001 point bending Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 30
- 238000000429 assembly Methods 0.000 claims abstract description 8
- 230000000712 assembly Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
-
- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
Abstract
The invention discloses a three-point bending fatigue test fixture supporting a negative stress ratio, which comprises first to third chuck assemblies, a fixed plate, a movable plate, a first access plate and a second access plate; the first to third chuck assemblies respectively comprise a first connecting piece, a second connecting piece, a first bearing, a second bearing, a first rotating shaft, a second rotating shaft, a U-shaped limiting piece, a pre-tightening plate and 2N pre-tightening bolts, wherein N is an integer greater than or equal to 1. The first chuck component and the second chuck component are respectively fixed at two ends of the fixing plate and used for locking two ends of the test piece; the third chuck component is arranged on the movable plate and used for locking the middle part of the test piece; the first access plate and the second access plate are respectively connected with the fixed plate and the movable plate. During operation, it is fixed with first access board, link to each other second access board and external actuating mechanism can. The invention has simple structure, simple and convenient assembly and disassembly, can not generate dislocation of the test piece, and can realize the fatigue test of the negative stress ratio.
Description
Technical Field
The invention relates to the technical field of test equipment, in particular to a three-point bending fatigue test fixture supporting a negative stress ratio.
Background
The three-point bending fatigue test is an experimental method for obtaining the fatigue property of a material by circularly loading bending load. The fatigue life curve, the residual stiffness curve and other fatigue characteristics of the material can be obtained by utilizing a three-point bending fatigue test. The stress ratio is the ratio of the valley load to the peak load during the fatigue cycle loading. Three-point bending tests require testing the effect of different stress ratios on fatigue life. In the three-point bending test clamp recommended in the current test standard, the test piece and the clamp are simply contacted together, so that the position of the test piece is moved in a fatigue test. Meanwhile, because the test piece and the clamp are not fixed together, the load can be loaded only in a single direction during the fatigue test, and when the load is reversed, the clamp can be separated from the test piece, so that the two-way loading fatigue test with the negative stress ratio cannot be carried out. The problem that the prior art is urgently needed to solve is to ensure that a test piece and a clamp are always in a contact state and can carry out a bidirectional loaded negative stress ratio fatigue test.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-point bending fatigue test fixture supporting a negative stress ratio aiming at the defects related in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a three-point bending fatigue test fixture supporting a negative stress ratio comprises first to third chuck assemblies, a fixed plate, a movable plate, a first access plate and a second access plate;
the first to third chuck assemblies respectively comprise a first connecting piece, a second connecting piece, a first bearing, a second bearing, a first rotating shaft, a second rotating shaft, a U-shaped limiting piece, a pre-tightening plate and 2N pre-tightening bolts, wherein N is an integer greater than or equal to 1;
the U-shaped limiting piece comprises a bottom plate, a first side plate and a second side plate, wherein the bottom ends of the first side plate and the second side plate are respectively and vertically fixedly connected with two ends of the bottom plate; the top ends of the first side plate and the second side plate are respectively provided with N threaded holes matched with the pre-tightening bolts; the pre-tightening plate is provided with a through hole matched with the threaded holes at the top ends of the first side plate and the second side plate, and the pre-tightening plate is connected with the top ends of the first side plate and the second side plate through 2N pre-tightening bolts through threads, so that the test piece is clamped between the pre-tightening plate and the bottom plate; the 2N pre-tightening bolts are used for adjusting the pre-tightening force between the test piece and the pre-tightening plate and between the test piece and the base plate;
the first connecting piece and the second connecting piece both comprise a long plate and a short plate, and one end of the short plate is vertically and fixedly connected with one end of the long plate; the long plate of the first connecting piece is provided with a bearing hole for mounting a first bearing, and the long plate of the second connecting piece is provided with a bearing hole for mounting a second bearing;
one end of the first rotating shaft is vertically and fixedly connected with the center of the end face, far away from the second side plate, of the first side plate, and the other end of the first rotating shaft is connected with the bearing hole of the first connecting piece long plate through a first bearing and a first connecting piece; one end of the second rotating shaft is fixedly connected with the center of the end face, far away from the first side plate, of the second side plate, and the other end of the second rotating shaft is connected with a second connecting piece at a bearing hole of the long plate of the second connecting piece through a second bearing; the long plate of the first connecting piece and the long plate of the second connecting piece are arranged in parallel, the short plate of the first connecting piece and the short plate of the second connecting piece are positioned between the long plate of the first connecting piece and the long plate of the second connecting piece, and the U-shaped limiting piece can freely rotate between the long plate of the first connecting piece and the long plate of the second connecting piece;
the fixing plate comprises an upper end face, a lower end face, two end faces and two side faces; the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the first chuck component are respectively and vertically fixedly connected with two side surfaces of one end of the fixed plate, and the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the second chuck component are respectively and vertically fixedly connected with two side surfaces of the other end of the fixed plate, so that the first chuck component and the second chuck component are respectively fixed at two ends of the fixed plate; the first chuck component and the second chuck component are used for locking two ends of the test piece;
the movable plate comprises an upper end surface, a lower end surface, two end surfaces and two side surfaces; the end surfaces of two ends of the movable plate are respectively and vertically fixedly connected with the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the third chuck component; the third chuck component is used for locking the middle part of the test piece;
one end of the first access plate is vertically and fixedly connected with the upper end face of the fixed plate, and one end of the second access plate is vertically and fixedly connected with the lower end face of the movable plate.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the structure is simple, and the disassembly and the assembly are simple and convenient;
2. the test piece can not be dislocated;
3. the negative stress ratio fatigue test can be realized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1-a first access plate, 2-a second access plate, 3-a fixed plate, 4-a movable plate, 5-a first side plate of a U-shaped limiting part in a third chuck component, 6-a second side plate of the U-shaped limiting part in a second chuck component, 7-a bottom plate of the U-shaped limiting part in the second chuck component, 8-a pre-tightening plate of the second chuck component, 9-a pre-tightening bolt of the second chuck component, 10-a first connecting piece of the second chuck component, 11-a second connecting piece of the second chuck component, 12-a first rotating shaft of the second chuck component, 13-a first bearing of the second chuck component, and 14-a test piece.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in fig. 1, the invention discloses a three-point bending fatigue test fixture supporting a negative stress ratio, comprising first to third chuck assemblies, a fixed plate, a movable plate, a first access plate and a second access plate;
the first to third chuck assemblies respectively comprise a first connecting piece, a second connecting piece, a first bearing, a second bearing, a first rotating shaft, a second rotating shaft, a U-shaped limiting piece, a pre-tightening plate and 2N pre-tightening bolts, wherein N is an integer greater than or equal to 1;
the U-shaped limiting piece comprises a bottom plate, a first side plate and a second side plate, wherein the bottom ends of the first side plate and the second side plate are respectively and vertically fixedly connected with two ends of the bottom plate; the top ends of the first side plate and the second side plate are respectively provided with N threaded holes matched with the pre-tightening bolts; the pre-tightening plate is provided with a through hole matched with the threaded holes at the top ends of the first side plate and the second side plate, and the pre-tightening plate is connected with the top ends of the first side plate and the second side plate through 2N pre-tightening bolts through threads, so that the test piece is clamped between the pre-tightening plate and the bottom plate; the 2N pre-tightening bolts are used for adjusting the pre-tightening force between the test piece and the pre-tightening plate and between the test piece and the base plate;
the first connecting piece and the second connecting piece both comprise a long plate and a short plate, and one end of the short plate is vertically and fixedly connected with one end of the long plate; the long plate of the first connecting piece is provided with a bearing hole for mounting a first bearing, and the long plate of the second connecting piece is provided with a bearing hole for mounting a second bearing;
one end of the first rotating shaft is vertically and fixedly connected with the center of the end face, far away from the second side plate, of the first side plate, and the other end of the first rotating shaft is connected with the bearing hole of the first connecting piece long plate through a first bearing and a first connecting piece; one end of the second rotating shaft is fixedly connected with the center of the end face, far away from the first side plate, of the second side plate, and the other end of the second rotating shaft is connected with a second connecting piece at a bearing hole of the long plate of the second connecting piece through a second bearing; the long plate of the first connecting piece and the long plate of the second connecting piece are arranged in parallel, the short plate of the first connecting piece and the short plate of the second connecting piece are positioned between the long plate of the first connecting piece and the long plate of the second connecting piece, and the U-shaped limiting piece can freely rotate between the long plate of the first connecting piece and the long plate of the second connecting piece;
the fixing plate comprises an upper end face, a lower end face, two end faces and two side faces; the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the first chuck component are respectively and vertically fixedly connected with two side surfaces of one end of the fixed plate, and the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the second chuck component are respectively and vertically fixedly connected with two side surfaces of the other end of the fixed plate, so that the first chuck component and the second chuck component are respectively fixed at two ends of the fixed plate; the first chuck component and the second chuck component are used for locking two ends of the test piece;
the movable plate comprises an upper end surface, a lower end surface, two end surfaces and two side surfaces; the end surfaces of two ends of the movable plate are respectively and vertically fixedly connected with the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the third chuck component; the third chuck component is used for locking the middle part of the test piece;
one end of the first access plate is vertically and fixedly connected with the upper end face of the fixed plate, and one end of the second access plate is vertically and fixedly connected with the lower end face of the movable plate.
During operation, it is fixed with first access board, link to each other second access board and external actuating mechanism can.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A three-point bending fatigue test fixture supporting a negative stress ratio is characterized by comprising first to third chuck assemblies, a fixed plate, a movable plate, a first access plate and a second access plate;
the first to third chuck assemblies respectively comprise a first connecting piece, a second connecting piece, a first bearing, a second bearing, a first rotating shaft, a second rotating shaft, a U-shaped limiting piece, a pre-tightening plate and 2N pre-tightening bolts, wherein N is an integer greater than or equal to 1;
the U-shaped limiting piece comprises a bottom plate, a first side plate and a second side plate, wherein the bottom ends of the first side plate and the second side plate are respectively and vertically fixedly connected with two ends of the bottom plate; the top ends of the first side plate and the second side plate are respectively provided with N threaded holes matched with the pre-tightening bolts; the pre-tightening plate is provided with a through hole matched with the threaded holes at the top ends of the first side plate and the second side plate, and the pre-tightening plate is connected with the top ends of the first side plate and the second side plate through 2N pre-tightening bolts through threads, so that the test piece is clamped between the pre-tightening plate and the bottom plate; the 2N pre-tightening bolts are used for adjusting the pre-tightening force between the test piece and the pre-tightening plate and between the test piece and the base plate;
the first connecting piece and the second connecting piece both comprise a long plate and a short plate, and one end of the short plate is vertically and fixedly connected with one end of the long plate; the long plate of the first connecting piece is provided with a bearing hole for mounting a first bearing, and the long plate of the second connecting piece is provided with a bearing hole for mounting a second bearing;
one end of the first rotating shaft is vertically and fixedly connected with the center of the end face, far away from the second side plate, of the first side plate, and the other end of the first rotating shaft is connected with the bearing hole of the first connecting piece long plate through a first bearing and a first connecting piece; one end of the second rotating shaft is fixedly connected with the center of the end face, far away from the first side plate, of the second side plate, and the other end of the second rotating shaft is connected with a second connecting piece at a bearing hole of the long plate of the second connecting piece through a second bearing; the long plate of the first connecting piece and the long plate of the second connecting piece are arranged in parallel, the short plate of the first connecting piece and the short plate of the second connecting piece are positioned between the long plate of the first connecting piece and the long plate of the second connecting piece, and the U-shaped limiting piece can freely rotate between the long plate of the first connecting piece and the long plate of the second connecting piece;
the fixing plate comprises an upper end face, a lower end face, two end faces and two side faces; the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the first chuck component are respectively and vertically fixedly connected with two side surfaces of one end of the fixed plate, and the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the second chuck component are respectively and vertically fixedly connected with two side surfaces of the other end of the fixed plate, so that the first chuck component and the second chuck component are respectively fixed at two ends of the fixed plate; the first chuck component and the second chuck component are used for locking two ends of the test piece;
the movable plate comprises an upper end surface, a lower end surface, two end surfaces and two side surfaces; the end surfaces of two ends of the movable plate are respectively and vertically fixedly connected with the other end of the first connecting piece short plate and the other end of the second connecting piece short plate in the third chuck component; the third chuck component is used for locking the middle part of the test piece;
one end of the first access plate is vertically and fixedly connected with the upper end face of the fixed plate, and one end of the second access plate is vertically and fixedly connected with the lower end face of the movable plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911125914.XA CN110763555A (en) | 2019-11-18 | 2019-11-18 | Three-point bending fatigue test fixture supporting negative stress ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911125914.XA CN110763555A (en) | 2019-11-18 | 2019-11-18 | Three-point bending fatigue test fixture supporting negative stress ratio |
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| Publication Number | Publication Date |
|---|---|
| CN110763555A true CN110763555A (en) | 2020-02-07 |
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| CN201911125914.XA Pending CN110763555A (en) | 2019-11-18 | 2019-11-18 | Three-point bending fatigue test fixture supporting negative stress ratio |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557181A (en) * | 2020-12-01 | 2021-03-26 | 郑州大学 | Clamp for realizing four-point bending and four-point shearing fatigue of positive and negative stress ratios of rock concrete |
| CN113340741A (en) * | 2021-06-04 | 2021-09-03 | 山东方圆建筑材料有限公司 | Test platform and test method |
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| CN107917844A (en) * | 2018-01-16 | 2018-04-17 | 天津工业大学 | A kind of 3 points of composite material, four-point bending fatigue universal test fixture |
| CN108844813A (en) * | 2018-08-17 | 2018-11-20 | 南京航空航天大学 | A kind of fixture for fatigue tester |
| CN109649682A (en) * | 2018-10-31 | 2019-04-19 | 中国飞机强度研究所 | A kind of 3 points of wingbar curved Buckling Fatigue Testing fixtures |
| CN110108575A (en) * | 2019-01-03 | 2019-08-09 | 北京交通大学 | Bolt pure bending fatigue test tool and system |
| CN209513419U (en) * | 2018-12-04 | 2019-10-18 | 中国航空工业集团公司西安飞机设计研究所 | A kind of three-point bending shearing field beam fatigue test clamper |
| CN211717957U (en) * | 2019-11-18 | 2020-10-20 | 南京航空航天大学 | Three-point bending fatigue test fixture supporting negative stress ratio |
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2019
- 2019-11-18 CN CN201911125914.XA patent/CN110763555A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106950107A (en) * | 2017-03-30 | 2017-07-14 | 南京航空航天大学 | A kind of three-point bending fatigue experimental device |
| CN107917844A (en) * | 2018-01-16 | 2018-04-17 | 天津工业大学 | A kind of 3 points of composite material, four-point bending fatigue universal test fixture |
| CN108844813A (en) * | 2018-08-17 | 2018-11-20 | 南京航空航天大学 | A kind of fixture for fatigue tester |
| CN109649682A (en) * | 2018-10-31 | 2019-04-19 | 中国飞机强度研究所 | A kind of 3 points of wingbar curved Buckling Fatigue Testing fixtures |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557181A (en) * | 2020-12-01 | 2021-03-26 | 郑州大学 | Clamp for realizing four-point bending and four-point shearing fatigue of positive and negative stress ratios of rock concrete |
| CN112557181B (en) * | 2020-12-01 | 2023-06-09 | 郑州大学 | Clamp for realizing four-point bending and four-point shearing fatigue of rock concrete with positive and negative stress ratio |
| CN113340741A (en) * | 2021-06-04 | 2021-09-03 | 山东方圆建筑材料有限公司 | Test platform and test method |
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