CN106706453B - A kind of Parts test crack monitoring method - Google Patents
A kind of Parts test crack monitoring method Download PDFInfo
- Publication number
- CN106706453B CN106706453B CN201611100697.5A CN201611100697A CN106706453B CN 106706453 B CN106706453 B CN 106706453B CN 201611100697 A CN201611100697 A CN 201611100697A CN 106706453 B CN106706453 B CN 106706453B
- Authority
- CN
- China
- Prior art keywords
- test
- parts
- monitoring method
- piston rod
- crack monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The invention discloses a kind of Parts to test crack monitoring method, and high pressure oil is transmitted on components by this method by pressurized cylinder, simulates loading conditions of the components in real processes, the bottom end of the supercharging piston rod of pressurized cylinder is connected with displacement sensor.It is set by the limit value of the displacement amplitude of supercharging piston rod in testing Parts, when displacement amplitude is more than the limit value of setting, by program control facility autostop, achievees the effect that crack monitoring.The method of the present invention can save manpower, improve safety, and the accuracy of guarantee test, and applied widely.
Description
Technical field
The invention belongs to testing of materials fields, in particular to fatigue test crack monitoring method.
Background technique
In Parts test, the monitoring of crackle is always focus of attention, and the on-line monitoring of crackle is generally acknowledged difficulty
Point.In Parts test, crackle finds to be easy to cause test specimen and the tooling even damage of loading equipemtn not in time
It is bad, while also leading to components actual life there are certain inaccuracies, influence final test result.Components are split at present
The monitoring of line is generally manually observed using naked eyes come timing, cracked rear manual shut-down, one when fatigue test is tested
As do not shut down within 24 hours, need testing crew to be monitored at any time to the state of components, prevent crackle it is excessive cause components,
On the one hand the damage of tooling or testing equipment wastes a large amount of human resources, additionally there are some potential safety problemss.?
The human input of test is increased, while crackle judgment criteria causes the precision decline of test without standard measure.
Small crackle is showed in terms of characteristic macroscopically and is not obvious, such as vibration, displacement etc..In addition same zero
Component, crackle generating unit is sometimes not consistent, and crackle results from the position that can not directly observe sometimes, using camera shooting
Technology or strain gauge technique are also difficult to realize the complete on-line monitoring of crackle.
By taking fatigue test for body of engine as an example, when body generates fine crack during test, body it is entire strong
Degree can be continued to run under predetermined load soon weakening, when the crack propagation of body to a certain degree when,
Structure crack just can macroscopically show apparent characteristic.If components crackle finds not in time, to will affect fatigue test
The service life of middle components further influences the accuracy of fatigue test results, it could even be possible to drawing the wrong conclusion.
As it can be seen that the method that the prior art uses has, test safety not can guarantee, waste of manpower, crack length are difficult to essence
The defects of really control, the precision of test result is not high.
Summary of the invention
In view of the drawbacks described above of the prior art, method proposed by the present invention aims to solve the problem that crackle exists in Parts test
The difficulties of line monitoring realize that Parts test is unattended.The purpose of the present invention is real by the following technical programs
Existing.
A kind of Parts test crack monitoring method, described method includes following steps:
1) testing equipment, including loading equipemtn, test tool and tested components are installed；Guarantee from the hydraulic of pumping plant
The pressure of oil can smoothly be pressurized and be transmitted on tested components；
2) test procedure is opened, the size and waveform of hydraulic oil pressure are adjusted by adjusting servo valve；
3) it is loaded according to predetermined load, opens testing equipment, the displacement amplitude amount of piston rod after observation is opened；
4) it shuts down, the displacement amplitude limit value of piston rod is set, and program is set when piston rod displacement amplitude is more than limit value,
Equipment autostop；
5) it is again turned on equipment, is loaded according to predetermined load, is tested；
6) when crackle occurs in test specimen, piston rod displacement amplitude transfinites, equipment autostop.
Further, the method also includes: remove tested components and carry out detailed inspection, check crackle initial position and
Size is for further analysis.
Further, the waveform in step 2) use sine wave, can also using as square wave, triangular wave and except sine wave,
Other waveforms outside square wave and triangular wave.
Further, the limit value in step 4) is 1-5 millimeters bigger than the displacement amplitude after opening.
The present invention is based on monitoring principle are as follows: when test specimen crack and crack propagation process in, test specimen
Rigidity has certain decline, and the displacement amplitude for loading piston rod can increase accordingly, to the limit value of the displacement amplitude of load piston rod
It is set, when displacement amplitude is more than the limit value of setting, autostop is realized by process control, to reach fatigue test
The effect of middle crack monitoring.
The present invention has the advantages that
1. saving a large amount of manpower, by monitoring the amplitude situation of change of supercharging piston rod, certain limit can be set
Place value cooperates certain control means to can achieve Parts and tests unattended effect.
2. improving the safety of Parts test.Occur to stop automatically when crackle during components test
Machine avoids a possibility that hurting sb.'s feelings when components are broken, substantially increases test without people close to components naked-eye observation
Safety coefficient.
3. providing the accuracy of test.By setting the magnitude limit of different piston rod displacements, zero can control
The length scale of part crackle, so that the coherence enhancing of each testing site, improves the accuracy of test.
4. applicability is wide, the present invention can extend to similar hydraulic fatigue test, can also be crackle prison in other tests
It surveys and thinking is provided.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Attached drawing 1 shows the equipment schematic diagram that the components crack monitoring method of embodiment according to the present invention uses.
Attached drawing 2 shows the components crack monitoring method control process schematic diagram of embodiment according to 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 attached 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.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened is fully disclosed to those skilled in the art.
Embodiment according to the present invention proposes a kind of Parts test crack monitoring method, what this method used
Equipment passes through the common of supercharging piston rod 2 and servo valve 3 with reference to the low pressure oil 1 that shown in attached drawing 1, hydraulic power unit (not shown) is generated
The high pressure oil for generating certain waveform after effect in high-voltage oil cavity 4 is input in the tooling oil pocket 6 of fatigue test by oil pipe 5, and
It is transmitted on components 7, simulates loading conditions of the components in real processes.The bottom end of supercharging piston rod 2 is connected with displacement and passes
Sensor 8.When components crack, since the local stiffness of components dies down, the oil mass variation in tooling oil pocket 6 has one
Fixed increase, since oil cylinder high-voltage oil cavity 4 is close to position sectional area the cutting much smaller than tooling oil pocket 6 at 2 top of supercharging piston rod
Area, according to the Incoercibility and the principle of mass conservation of oil, the minor change of the inner oil mass of tooling 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 are more big changes, therefore pass through monitoring charged piston
The displacement amplitude situation of bar 2 is to be able to achieve the monitoring of components crackle.
Specific monitoring method control process refers to Fig. 2, and pressurized cylinder 9 is certain by the displacement output of control supercharging piston rod 2
The oil pressure of waveform, present embodiment use sine wave, using such as square wave, triangular wave and can also remove sine wave, square wave certainly
With other waveforms outside triangular wave.When components crack, the displacement amplitude of piston rod increases, and reaches the limit of setting
When, system issues halt command to controller, to achieve the purpose that components, once generation crackle can hard stop.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, guaranteed from pumping plant
The pressure of hydraulic oil can smoothly be pressurized and be transmitted on tested body；
2) test procedure is opened, the size and waveform of hydraulic oil pressure, this embodiment party are adjusted by adjusting servo valve
Formula uses sine wave；
3) it is loaded according to predetermined load, opens testing equipment, the displacement amplitude amount of supercharging piston rod after observation is opened；
4) it shuts down, the displacement amplitude limit value of piston rod is set, engine body according to the present embodiment sets limit value ratio
Displacement amplitude after unlatching is 3 millimeters big, and program is arranged when piston rod displacement amplitude is more than limit value, equipment autostop；
5) it is again turned on equipment, is loaded according to predetermined load, is tested；
6) when crackle occurs in tested body, when piston rod displacement amplitude is more than 3 millimeters, equipment autostop；
7) it removes the tested body of test and carries out detailed inspection, check that initial position and size of crackle etc. are used for further
Analysis
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (5)
1. a kind of Parts test crack monitoring method, which is characterized in that described method includes following steps:
1) testing equipment, including loading equipemtn, test tool and tested components are installed；Guarantee the hydraulic oil from pumping plant
Pressure can smoothly be pressurized and be transmitted on tested components；
2) test procedure is opened, the size and waveform of hydraulic oil pressure are adjusted by adjusting servo valve；
3) it is loaded according to predetermined load, opens testing equipment, the displacement amplitude amount of piston rod after observation is opened；
4) it shuts down, the displacement amplitude limit value of piston rod is set, and program is set when piston rod displacement amplitude is more than limit value, equipment
Autostop；
5) it is again turned on equipment, is loaded according to predetermined load, is tested；
6) when crackle occur in tested components, piston rod displacement amplitude transfinites, equipment autostop.
2. Parts as described in claim 1 test crack monitoring method, which is characterized in that the Parts examination
Test crack monitoring method further include: remove tested components and carry out detailed inspection, check initial position and the size of crackle with
In further analysis.
3. Parts as claimed in claim 1 or 2 test crack monitoring method, which is characterized in that the wave in step 2)
Shape uses sine wave.
4. Parts as claimed in claim 1 or 2 test crack monitoring method, which is characterized in that the wave in step 2)
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 test crack monitoring method, which is characterized in that the limit in step 4)
It is worth 1-5 millimeters bigger than the displacement amplitude after opening.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106706453A CN106706453A (en) | 2017-05-24 |
| CN106706453B true CN106706453B (en) | 2019-08-27 |
Family
ID=58935681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611100697.5A Active CN106706453B (en) | 2016-12-05 | 2016-12-05 | A kind of Parts test crack monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106706453B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080004737A (en) * | 2006-07-06 | 2008-01-10 | 조명래 | Method and measuring device of fatigue |
| CN201159706Y (en) * | 2008-03-13 | 2008-12-03 | 西安科技大学 | Indirect stretching fatigue tester |
| 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 |
| 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 |
| CN104089760B (en) * | 2014-06-18 | 2016-08-24 | 潍柴动力股份有限公司 | The fatigue test method of gas engine part |
| CN106153324A (en) * | 2016-07-28 | 2016-11-23 | 西安冠泰检测技术有限公司 | A kind of inflation fatigue test loading device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2933495B1 (en) * | 2008-07-07 | 2013-01-18 | Univ Lille Sciences Tech | TRIAXIAL CELL OF GEOMATERIALS UNDER PRESSURE AND SHEAR |
-
2016
- 2016-12-05 CN CN201611100697.5A patent/CN106706453B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080004737A (en) * | 2006-07-06 | 2008-01-10 | 조명래 | Method and measuring device of fatigue |
| CN201159706Y (en) * | 2008-03-13 | 2008-12-03 | 西安科技大学 | Indirect stretching fatigue tester |
| 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 |
| CN104089760B (en) * | 2014-06-18 | 2016-08-24 | 潍柴动力股份有限公司 | The fatigue test method of gas engine part |
| 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 |
| CN106153324A (en) * | 2016-07-28 | 2016-11-23 | 西安冠泰检测技术有限公司 | A kind of inflation fatigue test loading device |
Non-Patent Citations (2)
| Title |
|---|
| 发动机机体疲劳裂纹诊断的时序方法;刘震涛等;《浙江大学学报（工学版）》;20120331;第46卷(第3期);第489-493页 * |
| 基于应变相对变化量的基体疲劳裂纹识别方法;张鹏伟等;《浙江大学学报(工学版)》;20120531;第46卷(第5期);第948-953页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106706453A (en) | 2017-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gómez et al. | Crack detection in rotating shafts based on 3× energy: Analytical and experimental analyses | |
| CN103760036B (en) | A kind of method of testing of steel fiber reinforced concrete destructive test initial cracking load | |
| CN108663712A (en) | A kind of Thin interbed method of side slope earthquake damage | |
| Simunek et al. | Fatigue crack growth under constant and variable amplitude loading at semi-elliptical and V-notched steel specimens | |
| CN106706453B (en) | A kind of Parts test crack monitoring method | |
| CN203385699U (en) | System for detecting residual stress and structure defect | |
| Samigullin et al. | Control of physical and mechanical char-acteristics of steel by small punch test method | |
| Dao | Cointegration method for temperature effect removal in damage detection based on Lamb waves | |
| Kostyukov et al. | Usage of characteristic function as informative diagnostic feature | |
| DE3049628A1 (en) | METHOD FOR MONITORING THE DEVELOPMENT AND PROGRESS OF CRACKS IN MACHINE PARTS AND COMPONENTS, AND A DEVICE FOR CARRYING OUT THE METHOD | |
| CN206019890U (en) | Tensioning instrument is used in screw rod detection | |
| M. Nasir et al. | Accelerating the fatigue analysis based on strain signal using Hilbert–Huang transform | |
| Moura et al. | A review of spectral and conventional methods for cycle counting and fatigue life estimation. Extension to finite element analysis | |
| Xu et al. | Fatigue failure process characterization for carbon fiber sheet reinforced steel rods using the acoustic emission technique | |
| Putra et al. | A Novel Way to Overcome Problems Arising in Strain Signal Measurements Leading to a Fatigue Failure Characterisation | |
| CN109470773A (en) | A kind of caliberating device and its working method of ultrasonic detecting probe | |
| Zhang et al. | Fatigue crack growth monitoring of idealized gearbox spline component using acoustic emission | |
| Dekys et al. | Use of MSC. ADAMS software product in modelling vibration sources | |
| Ružek et al. | Compression after impact and fatigue behavior of CFRP stiffened panels | |
| Jurčius et al. | Searching for residual stress measurement methods for structural steel components | |
| Ozevin et al. | Fatigue crack detection at gearbox spline component using acoustic emission method | |
| Bakhri et al. | Preliminary Development of Online Monitoring Acoustic Emission System for the Integrity of Research Reactor Components | |
| Schaffrath¹ et al. | Characterisation and simulation of X60 elbow pipes in case of ULCF loading | |
| Harding et al. | Model‐Assisted POD for Ultrasonic Detection of Cracks at Fastener Holes | |
| Mustapha et al. | Novitect; a novelty detection soft-computing algorithm for Structural Health Monitoring (SHM) system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |