CN112461693A - Detection method for gear tooth root bending fatigue crack initiation - Google Patents
Detection method for gear tooth root bending fatigue crack initiation Download PDFInfo
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- CN112461693A CN112461693A CN202011295756.5A CN202011295756A CN112461693A CN 112461693 A CN112461693 A CN 112461693A CN 202011295756 A CN202011295756 A CN 202011295756A CN 112461693 A CN112461693 A CN 112461693A
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- gear
- test
- bending fatigue
- stress
- detection system
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- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 238000005452 bending Methods 0.000 title claims abstract description 31
- 230000000977 initiatory effect Effects 0.000 title abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000009661 fatigue test Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 12
- 208000037656 Respiratory Sounds Diseases 0.000 claims 1
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/021—Gearings
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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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
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0064—Initiation of crack
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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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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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
- G01N2203/0058—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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- Physics & Mathematics (AREA)
- General 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)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a detection method for the generation of a gear tooth root bending fatigue crack, wherein a test gear is arranged on a test fixture, the test fixture is fixed with a bending fatigue testing machine, and a stress sheet is attached to the gear tooth position of the test gear and is connected with a computer detection system through a cable; loading a load on the single tooth of the test gear with the stress sheet attached thereto through a bending fatigue testing machine, and transmitting the test stress to a computer detection system through the stress sheet; and judging whether the gear has cracks or not according to the stress change condition acquired by the computer detection system. The invention can complete the detection of the generation and the expansion of the gear bending fatigue crack, has more accurate detection of the crack initiation, can adjust the detection position according to different loading conditions of the gear, and realizes the experimental test of the gear tooth root bending fatigue crack initiation. The method is more accurate in observation of the gear from crack initiation-propagation-fracture, and the fatigue test can obtain more accurate detection data.
Description
Technical Field
The invention belongs to the technical field of crack detection, and particularly relates to a detection method for the generation of bending fatigue cracks of gear tooth roots.
Background
At present, in a gear bending fatigue test, a bending fatigue testing machine generally utilizes a test fixture to carry out pulse loading on gear teeth of a test gear until the gear teeth fail in fatigue or go beyond, and a set of test data is obtained after the test is finished. The method for judging the crack initiation to the gear fracture failure of the gear during the fatigue process is mainly realized through the frequency change of a testing machine, but when the frequency change occurs, the gear often generates cracks and possibly expands to a certain extent, the stage of the crack initiation of the gear due to fatigue cannot be scientifically and accurately judged, and the method is particularly important for judging the crack initiation of the gear with strict engineering application.
Disclosure of Invention
The invention provides a detection method for the generation of bending fatigue cracks at gear tooth roots, which aims to solve the technical problems that: the problems that the bending fatigue failure of the gear is determined by the frequency change in the test process, and the basis for detecting the crack initiation of the gear is simple and inaccurate are solved.
In order to solve the technical problems, the invention provides a detection method for the generation of bending fatigue cracks of gear tooth roots, which is characterized by comprising the following steps: the method comprises the following steps of (1) adopting a stress sheet 1, a computer detection system 2, a test fixture 3, a test gear 4 and a bending fatigue testing machine 5;
s1, mounting the test gear 4 on a test fixture 3, fixing the test fixture 3 with a bending fatigue testing machine 5, and attaching the stress sheet 1 to the gear teeth of the test gear 4 and connecting the stress sheet with the computer detection system 2 through a cable;
s2, loading a load on the single tooth of the test gear 4 stuck with the stress sheet through the bending fatigue testing machine 5, and transmitting the test stress to the computer detection system 2 through the stress sheet 1;
and S3, judging whether the gear has cracks or not through the stress change condition acquired by the computer detection system 2.
Has the advantages that: the invention can complete the detection of the generation and the expansion of the gear bending fatigue crack, has more accurate detection of the crack initiation, can adjust the detection position according to different loading conditions of the gear, and realizes the experimental test of the gear tooth root bending fatigue crack initiation. The method is more accurate in observation of the gear from crack initiation-propagation-fracture, and the fatigue test can obtain more accurate detection data.
Drawings
FIG. 1 is a schematic diagram of a method for detecting the onset of gear tooth root bending fatigue cracks.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.
The invention provides a detection method for the generation of bending fatigue cracks of gear tooth roots, which is characterized by comprising the following steps: the method comprises the following steps of (1) adopting a stress sheet 1, a computer detection system 2, a test fixture 3, a test gear 4 and a bending fatigue testing machine 5;
s1, mounting the test gear 4 on a test fixture 3, fixing the test fixture 3 with a bending fatigue testing machine 5, and attaching the stress sheet 1 to the gear teeth of the test gear 4 and connecting the stress sheet with the computer detection system 2 through a cable;
s2, loading a load on the single tooth of the test gear 4 stuck with the stress sheet through the bending fatigue testing machine 5, and transmitting the test stress to the computer detection system 2 through the stress sheet 1;
s3, judging whether the gear has cracks or not through the stress change condition acquired by the computer detection system 2;
if the collected stress changes suddenly, the gear is judged to crack, and if the stress continues to change, the crack is judged to have already started to propagate.
As the crack generally generates the sliding surface crack, and the crack part has no bearing capacity, the stress is necessarily reduced macroscopically, and therefore, the stress sheet and the computer detection system are adopted to monitor the change of the stress of the loaded gear teeth in real time to detect the generation and the expansion of the gear tooth root crack more accurately.
The invention has the capability of finishing the generation and the expansion detection of the gear bending fatigue crack, can adjust the detection position according to different loading conditions of the gear and realizes the test of the generation of the gear tooth root bending fatigue crack.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The utility model provides a detection method that gear tooth root bending fatigue crackle is initiated which characterized in that: the method comprises the following steps of (1) adopting a stress sheet 1, a computer detection system 2, a test fixture 3, a test gear 4 and a bending fatigue testing machine 5;
s1, mounting the test gear 4 on a test fixture 3, fixing the test fixture 3 with a bending fatigue testing machine 5, and attaching the stress sheet 1 to the gear teeth of the test gear 4 and connecting the stress sheet with the computer detection system 2 through a cable;
s2, loading a load on the single tooth of the test gear 4 stuck with the stress sheet through the bending fatigue testing machine 5, and transmitting the test stress to the computer detection system 2 through the stress sheet 1;
and S3, judging whether the gear has cracks or not through the stress change condition acquired by the computer detection system 2.
2. The method for detecting the onset of gear tooth root bending fatigue crack according to claim 1, wherein: in S3, if the stress collected by the computer detection system changes suddenly, the gear is judged to crack.
3. The method for detecting the onset of gear tooth root bending fatigue crack according to claim 1, wherein: in S3, if the stress continues to change, it is determined that the crack has started to propagate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295756.5A CN112461693A (en) | 2020-11-18 | 2020-11-18 | Detection method for gear tooth root bending fatigue crack initiation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295756.5A CN112461693A (en) | 2020-11-18 | 2020-11-18 | Detection method for gear tooth root bending fatigue crack initiation |
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| Publication Number | Publication Date |
|---|---|
| CN112461693A true CN112461693A (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011295756.5A Pending CN112461693A (en) | 2020-11-18 | 2020-11-18 | Detection method for gear tooth root bending fatigue crack initiation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216674A (en) * | 2021-09-29 | 2022-03-22 | 中国航发湖南动力机械研究所 | Gear fatigue test piece and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05226718A (en) * | 1991-07-17 | 1993-09-03 | Kasei Optonix Co Ltd | Element for laminated piezoelectric actuator |
| CN103076247A (en) * | 2013-01-16 | 2013-05-01 | 南京航空航天大学 | Material bending fatigue test system and test method |
| CN109163990A (en) * | 2018-08-28 | 2019-01-08 | 中国科学院金属研究所 | A kind of measurement method of axially loaded high cycle fatigue crack initiating life |
-
2020
- 2020-11-18 CN CN202011295756.5A patent/CN112461693A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05226718A (en) * | 1991-07-17 | 1993-09-03 | Kasei Optonix Co Ltd | Element for laminated piezoelectric actuator |
| CN103076247A (en) * | 2013-01-16 | 2013-05-01 | 南京航空航天大学 | Material bending fatigue test system and test method |
| CN109163990A (en) * | 2018-08-28 | 2019-01-08 | 中国科学院金属研究所 | A kind of measurement method of axially loaded high cycle fatigue crack initiating life |
Non-Patent Citations (1)
| Title |
|---|
| 朱爱珠;李牧;田杨;肖海珠;何东升;张晓勇;: "设内隔板正交异性钢桥面板足尺模型疲劳试验", 钢结构, vol. 32, no. 01, pages 45 - 50 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216674A (en) * | 2021-09-29 | 2022-03-22 | 中国航发湖南动力机械研究所 | Gear fatigue test piece and manufacturing method thereof |
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