CN106706453A - Part fatigue test crack monitoring method - Google Patents
Part fatigue test crack monitoring method Download PDFInfo
- Publication number
- CN106706453A CN106706453A CN201611100697.5A CN201611100697A CN106706453A CN 106706453 A CN106706453 A CN 106706453A CN 201611100697 A CN201611100697 A CN 201611100697A CN 106706453 A CN106706453 A CN 106706453A
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- China
- Prior art keywords
- parts
- monitoring method
- piston rod
- crack monitoring
- displacement amplitude
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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
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0033—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining damage, crack or wear
-
- 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
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Aviation & Aerospace Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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 discloses a part fatigue test crack monitoring method. According to the method, high-pressure oil is transmitted to a part through a pressure cylinder to simulate a load situation of the part in an actual process, a displacement sensor is connected to the bottom end of a pressurizing piston rod of the pressure cylinder, a limit value of displacement amplitude of the pressurizing piston rod in a part fatigue test is set, equipment can be controlled to automatically shut down by a procedure when the displacement amplitude exceeds the set limit value, and thus a crack monitoring effect is achieved. The method disclosed by the invention has the advantages of saving labor, improving safety, guaranteeing test accuracy and further being wide in application range.
Description
Technical field
The invention belongs to testing of materials field, more particularly to fatigue test crack monitoring method.
Background technology
In Parts experiment, the monitoring of crackle is always focus of attention, and the on-line monitoring of crackle is generally acknowledged difficulty
Point.In Parts experiment, crackle finds not in time, to easily cause test specimen and the frock even damage of loading equipemtn
It is bad, while also causing parts actual life to there is certain inaccuracy, influence final result of the test.Current parts split
The monitoring of line is typically manually observed using naked eyes come timing, manual shut-down after crackle occurs, one when fatigue test is tested
As do not shut down within 24 hours, it is necessary to testing crew is monitored to the state of parts at any time, prevent crackle it is excessive cause parts,
The damage of frock or testing equipment, on the one hand wastes substantial amounts of human resources, additionally there are certain potential safety hazard.
The human input of experiment is increased, while crackle criterion is without standard measure, causes the precision of experiment to decline.
Small crackle is showed not substantially in terms of characteristic macroscopically, such as vibration, displacement etc..Other same zero
Part, its crackle generating unit is sometimes not consistent, and crackle results from the position that cannot directly observe sometimes, using shooting
Technology or strain gauge technique also are difficult to realize the on-line monitoring completely of crackle.
By taking fatigue test for body of engine as an example, when body produces fine crack in process of the test, body it is whole strong
Degree does not weaken soon, but can be continued to run with predetermined load, when body Crack Extension to a certain degree when,
Structure crack just can macroscopically show obvious characteristic.If parts crackle finds that not in time, fatigue test can be influenceed
In the life-span of middle parts, the accuracy of fatigue test results is further influenceed, it could even be possible to drawing the wrong conclusion.
It can be seen that, the method that prior art is used has that experimental safe cannot ensure, waste of manpower, crack length are difficult to essence
Really control, the not high defect of precision of result of the test.
The content of the invention
In view of the drawbacks described above of prior art, crackle exists during method proposed by the present invention aims to solve the problem that Parts experiment
The difficulties of line monitoring, realize that Parts experiment is unattended.The purpose of the present invention is real by the following technical programs
Existing.
A kind of Parts test crack monitoring method, and methods described comprises the following steps：
1) testing equipment, including loading equipemtn, test tool and tested parts are installed；Ensure the hydraulic pressure from pumping plant
The pressure of oil can smoothly be pressurized and be delivered on tested parts；
2) test procedure is opened, the size and waveform of hydraulic oil pressure is adjusted by adjusting servo valve；
3) loaded according to predetermined load, opened testing equipment, the displacement amplitude amount of piston rod after observation unlatching；
4) shut down, set piston rod displacement amplitude limit value, and set program when piston rod displacement amplitude exceed limit value when,
Equipment autostop；
5) equipment is again turned on, is loaded according to predetermined load, tested；
6) when crackle occurs in test specimen, piston rod displacement amplitude transfinites, equipment autostop.
Further, methods described also includes：Pulling down tested parts carries out detailed inspection, check crackle original position and
Size is for further analysis.
Further, step 2) in waveform use sine wave, can also using as square wave, triangular wave and except sine wave,
Other waveforms outside square wave and triangular wave.
Further, step 4) in limit value it is bigger 1-5 millimeters than displacement amplitude after unlatching.
The monitoring principle that the present invention is based on is：When test specimen crack and crack propagation process in, test specimen
Rigidity has certain decline, and the displacement amplitude for loading piston rod can accordingly increase, the limit value of the displacement amplitude to loading piston rod
Set, when displacement amplitude exceedes the limit value for setting, autostop is realized by programme-control, so as to reach fatigue test
The effect of middle crack monitoring.
The advantage of the invention is that：
1. substantial amounts of manpower is saved, by monitoring the amplitude situation of change of supercharging piston rod, certain limit can be set
Place value, coordinates certain control device to reach Parts and tests unattended effect.
2. the security of Parts experiment is improve.Occur to stop automatically during crackle in parts process of the test
Machine, without people near parts naked-eye observations, it is to avoid the possibility that parts are hurted sb.'s feelings when being broken, substantially increases experiment
Safety coefficient.
3. the accuracy of experiment is provided.By setting the magnitude limit of different piston rod displacements, zero can be controlled
The length scale of part crackle so that the coherence enhancing of each testing site, improves the accuracy of experiment.
4. applicability is wide, and the present invention can extend to crackle prison in similar hydraulic fatigue test, or other experiments
Survey and thinking is provided.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Accompanying drawing 1 shows the equipment schematic diagram used according to the parts crack monitoring method of embodiment of the present invention.
Accompanying drawing 2 shows the parts crack monitoring method control process schematic diagram according to embodiment of the present invention.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in accompanying drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.Conversely, there is provided these implementation methods are able to be best understood from the disclosure, and can be by this public affairs
The scope opened it is complete convey to those skilled in the art.
According to the embodiment of the present invention, a kind of Parts experiment crack monitoring method is proposed, what the method was used
Shown in equipment refer to the attached drawing 1, the low pressure oil 1 that hydraulic power unit (not shown) is produced is common by supercharging piston rod 2 and servo valve 3
The hydraulic oil of certain waveform is produced after effect in high-voltage oil cavity 4, is input in the frock oil pocket 6 of fatigue test by oil pipe 5, and
It is delivered on parts 7, loading conditions of the simulation parts in real processes.The bottom of supercharging piston rod 2 is connected with displacement biography
Sensor 8.When parts are cracked, because the local stiffness of parts dies down, the oil mass change in frock oil pocket 6 has one
Fixed increase, because oil cylinder high-voltage oil cavity 4 is near position sectional area the cutting much smaller than frock oil pocket 6 at the top of supercharging piston rod 2
Area, according to the Incoercibility and the principle of mass conservation of oil, the minor variations of the inner oil mass of frock oil pocket 6 can be induced to piston rod
The large change of the oil mass at top, that is, the displacement of supercharging piston rod 2 is more big changes, therefore by monitoring charged piston
The displacement amplitude situation of bar 2 can realize the monitoring of parts crackle.
Specific monitoring method control process refers to Fig. 2, and pressurized cylinder 9 exports certain by controlling the displacement of supercharging piston rod 2
The oil pressure of waveform, present embodiment uses sine wave, certainly can also be using such as square wave, triangular wave and except sine wave, square wave
With other waveforms outside triangular wave.When parts are cracked, the displacement amplitude increase of piston rod reaches the limit of setting
When, system sends halt command to controller, so as to reach parts once occur crackle can hard stop purpose.Specifically
In operation, present embodiment can be implemented according to following method detailed step：
1) testing equipment, including loading equipemtn, test tool and tested engine body are installed, it is ensured that from pumping plant
The pressure of hydraulic oil can smoothly be pressurized and be delivered on tested body；
2) test procedure is opened, the size and waveform of hydraulic oil pressure, this embodiment party is adjusted by adjusting servo valve
Formula uses sine wave；
3) loaded according to predetermined load, opened testing equipment, the displacement amplitude amount of supercharging piston rod after observation unlatching；
4) shut down, the displacement amplitude limit value of piston rod is set, according to the engine body of present embodiment, set limit value ratio
Displacement amplitude after unlatching is big 3 millimeters, and set program when piston rod displacement amplitude exceed limit value when, equipment autostop；
5) equipment is again turned on, is loaded according to predetermined load, tested；
6) when crackle occurs in tested body, when piston rod displacement amplitude is more than 3 millimeters, equipment autostop；
7) pulling down the tested body of experiment carries out detailed inspection, checks original position and size of crackle etc. for further
Analysis
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Enclose and be defined.
Claims (5)
1. a kind of Parts test crack monitoring method, it is characterised in that methods described comprises the following steps：
1) testing equipment, including loading equipemtn, test tool and tested parts are installed；Ensure the hydraulic oil from pumping plant
Pressure can smoothly be pressurized and be delivered on tested parts；
2) test procedure is opened, the size and waveform of hydraulic oil pressure is adjusted by adjusting servo valve；
3) loaded according to predetermined load, opened testing equipment, the displacement amplitude amount of piston rod after observation unlatching；
4) shut down, set piston rod displacement amplitude limit value, and set program when piston rod displacement amplitude exceed limit value when, equipment
Autostop；
5) equipment is again turned on, is loaded according to predetermined load, tested；
6) when crackle occurs in test specimen, piston rod displacement amplitude transfinites, equipment autostop.
2. Parts as claimed in claim 1 test crack monitoring method, it is characterised in that the Parts examination
Testing crack monitoring method also includes：Pulling down tested parts carries out detailed inspection, check the original position and size of crackle with
In further analysis.
3. Parts as claimed in claim 1 or 2 experiment crack monitoring method, it is characterised in that step 2) in ripple
Shape uses sine wave.
4. Parts as claimed in claim 1 or 2 experiment crack monitoring method, it is characterised in that step 2) in ripple
Shape uses square wave, triangular wave or other waveforms in addition to sine wave, square wave and triangular wave.
5. Parts as claimed in claim 1 or 2 experiment crack monitoring method, it is characterised in that step 4) in limit
Value is bigger 1-5 millimeters than the displacement amplitude after unlatching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100697.5A CN106706453B (en) | 2016-12-05 | 2016-12-05 | A kind of Parts test crack monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100697.5A CN106706453B (en) | 2016-12-05 | 2016-12-05 | A kind of Parts test crack monitoring method |
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| CN106706453A true CN106706453A (en) | 2017-05-24 |
| CN106706453B CN106706453B (en) | 2019-08-27 |
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| CN201611100697.5A Active CN106706453B (en) | 2016-12-05 | 2016-12-05 | A kind of Parts test crack monitoring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593469A (en) * | 2018-03-24 | 2018-09-28 | 北京工业大学 | A kind of miniature thin-film test specimen fatigue crack monitoring method based on displacement measurement |
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| US20110132099A1 (en) * | 2008-07-07 | 2011-06-09 | Jean Secq | Triaxial cell for the testing of geomaterials in compression and in shear |
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| CN102607948A (en) * | 2012-03-02 | 2012-07-25 | 西安石油大学 | Method for characterizing steel fatigue crack propagation behavior for casing drilling |
| CN204142480U (en) * | 2014-09-19 | 2015-02-04 | 潍柴动力股份有限公司 | A kind of connecting rod fatigue experimental device |
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2016
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| CN201159706Y (en) * | 2008-03-13 | 2008-12-03 | 西安科技大学 | Indirect stretching fatigue tester |
| US20110132099A1 (en) * | 2008-07-07 | 2011-06-09 | Jean Secq | Triaxial cell for the testing of geomaterials in compression and in shear |
| CN201876393U (en) * | 2010-12-07 | 2011-06-22 | 浙江大学 | Hydraulic fatigue test system for engine body |
| CN102607948A (en) * | 2012-03-02 | 2012-07-25 | 西安石油大学 | Method for characterizing steel fatigue crack propagation behavior for casing drilling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593469A (en) * | 2018-03-24 | 2018-09-28 | 北京工业大学 | A kind of miniature thin-film test specimen fatigue crack monitoring method based on displacement measurement |
| CN108593469B (en) * | 2018-03-24 | 2020-07-31 | 北京工业大学 | Miniature thin film test piece fatigue crack monitoring method based on displacement measurement |
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| Publication number | Publication date |
|---|---|
| CN106706453B (en) | 2019-08-27 |
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