CN106645625B - A kind of experimental rig and analysis method of the acceleration of metal sealing stress relaxation - Google Patents
A kind of experimental rig and analysis method of the acceleration of metal sealing stress relaxation Download PDFInfo
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- CN106645625B CN106645625B CN201610429865.9A CN201610429865A CN106645625B CN 106645625 B CN106645625 B CN 106645625B CN 201610429865 A CN201610429865 A CN 201610429865A CN 106645625 B CN106645625 B CN 106645625B
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Abstract
The present invention relates to metal sealing stress relaxation detection technique fields, specifically disclose the experimental rig and analysis method of a kind of metal sealing stress relaxation acceleration.It is equipped with sample pedestal in insulating box inner bottom surface in the experimental rig, lower flange is arranged on sample base interior lower end surface by downstairs axis；It is provided on lower flange upper surface in annular groove and is equipped with metal sealing sample；It is equipped with upper flange on metal sealing sample, and the upper multi-diameter shaft symmetrical with downstairs axis is installed in upper flange upper surface, two-way stud passes through insulating box, and one end is mutually fixed with upper multi-diameter shaft, and the other end is fixedly connected with gland；Gland is connected by screw rod with the turbine and worm for being equipped with motor；And load sensor is equipped between gland and insulating box upper surface.The experimental rig and analysis method can substantially reduce test period and cost by carrying out short period test analysis, verifying the sealing performance in the case of metal sealing is used for a long time.
Description
Technical field
The invention belongs to metal sealing stress relaxation detection technique fields, and in particular to a kind of metal sealing stress relaxation adds
The experimental rig and analysis method of speed.
Background technique
Metal sealing is widely used in long-time service, low temperature, high temperature, high pressure, high vacuum, radiation, strong acid, highly basic and strong corruption
Operating conditions are severe, seal request is high, other seal forms are difficult to the occasion met the requirements for erosion etc..For long-term (many decades) clothes
The metal sealing of labour, may cause close the problems such as stress relaxation and creep (high temperature) can occur with the extension of use time
Envelope failure.Analysis and validation problem about sealing performance in metal sealing long-term use process, current theory and test are ground
Study carefully shortage effective solution scheme, the influence factor of one side sealing performance is more and sealing mechanism is complicated, without it is related at
Ripe theoretical offer support；On the other hand lack metal sealing stress relaxation relevant device, also rarely have correlation test development condition
Report, experimental technique urgently develop.
The stress relaxation of metal sealing is a slowly process, need to continuously carry out the long period (several years general)
Stress relaxation test could accurately obtain test data.However, the system of the factors such as the cost that is put to the test, product development cycle
About, carry out stress relaxation test according to a conventional method to be difficult to meet research work needs.Therefore, metal sealing stress relaxation need to be studied
The acceleration equivalent method of characteristic, and carry out the test in the corresponding short period and illustrate and verify the stress relaxation in its long-term
Characteristic.
Summary of the invention
The experimental rig and analysis method accelerated the purpose of the present invention is to provide a kind of metal sealing stress relaxation, is used for
The accelerated stress relaxation property of metal sealing is characterized, and carries out verification experimental verification, to reach with the stress of short period metal sealing
Relaxation accelerated test, to analyze, evaluate sealing performance in the case of its long-time service.
Technical scheme is as follows: a kind of experimental rig that metal sealing stress relaxation accelerates, the experimental rig packet
Include lower flange, upper flange, insulating box, gland, load sensor, turbine and worm, wherein be equipped with sample base in insulating box inner bottom surface
Seat, lower flange are arranged on sample base interior lower end surface by downstairs axis；It is provided with annular groove on lower flange upper surface,
And metal sealing sample is equipped in the annular groove；It is equipped on metal sealing sample similar and mutual to lower flange structure
Parallel upper flange, and the upper multi-diameter shaft symmetrical with downstairs axis is installed in upper flange upper surface, two-way stud passes through
Insulating box, one end are mutually fixed with upper multi-diameter shaft, and the other end is fixedly connected with gland；Gland is by screw rod and is equipped with motor
Turbine and worm be connected；And load sensor is equipped between gland and insulating box upper surface.
The bottom of the lower flange annular recess is equipped with high temperature strain foil, passes through the high-temperature electric being located in insulating box
Cable connection, and after high-temperature cable passes through insulating box, it is connected by common cable with stress-strain test system, and utilize close
Sealing seals corresponding wire guide.
The insulating box includes insulating box pedestal and constant temperature box cover, wherein is disposed with and runs through in constant temperature box cover
The sleeve of constant temperature box cover, studs passes through sleeve, and is fixed between multi-diameter shaft and gland.
The sample pedestal is the cylindrical structure that inside is provided with stepped hole, and the lower flange of disc-shaped structure passes through lower rank
Terraced axis is arranged on sample base interior lower end surface.
Worm screw in the worm and gear is connected with the bulge-structure at gland upper surface center, and worm and gear and its
The motor being connected is mounted on motor base.
On the insulating box through be equipped with thermometer, can real-time measurement show insulating box in temperature.
A kind of analysis method that metal sealing stress relaxation accelerates, this method specifically comprise the following steps:
Step 1, the experimental rig accelerated using metal sealing stress relaxation described in the claims, are arranged insulating box
Interior test temperature obtains the test data that residual contact stress changes over time；
Step 2 analyzes the test data in step 1, determines the characteristic value for accelerating metal sealing in characteristic parameter,
And make stress relaxation test data that there is good linear dependence；
Step 3 carries out linear regression processing to test data, obtains the stress relaxation kinetics equation of metal sealing；
The test data that residual contact stress under the different temperatures obtained using test is changed over time, acquisition are finally answered
Power relaxation kinetics equation are as follows:
Y2R(T, t)=K (T)-C (T) (log10 (t))
Wherein, Y2R(T, t) is remaining contact stress；K (T), C (T) are constant related with material, experimental condition, can be led to
The calculating of overstress relaxation test data, which is analyzed, to be obtained；
It, can be with the stress relaxation under forecast analysis different temperatures and time conditions using above-mentioned stress relaxation kinetics equation
Situation.
Test data is obtained in the step 1 to specifically include:
The test temperature in insulating box is arranged in the experimental rig accelerated using metal sealing stress relaxation of the present invention
For T, the test for obtaining the residual contact stress of metal o-ring sample and changing over time is acquired by stress-strain test system
Data, and multiple test temperatures are set and are tested, at a temperature of obtaining different tests, the remaining contact of metal o-ring sample is answered
The test data that power changes over time.
The characteristic value of specific metal sealing in the step 2 are as follows:
Characteristic parameter LMP will be accelerated to be defined as having with metal sealing stress relaxation characteristics and test period, test temperature
The parameter of pass, expression formula are as follows:
LMP (T, t)=T (C+log10(t))
Wherein, C is the characteristic value of metal sealing；
Correlation analysis is carried out two-by-two using the multiple groups test data in step 1, and determines the number of the characteristic value C of metal sealing
Value makes the stress relaxation test data indicated with parameter LMP have good linear dependence.
Remarkable result of the invention is: a kind of experimental rig that metal sealing stress relaxation accelerates of the present invention,
It can for a long time, steadily carry out the stress relaxation test under different stabilizations, evaluation metal sealing stress relaxation can be obtained in real time
Key data of characteristic, including load, sealing surface residual stress etc.；The analysis method provides metal sealing stress pine
It relaxes and accelerates characteristic parameter and the stress relaxation kinetics equation with the parameter characterization, can rationally characterize metal sealing acceleration and want
Ask and under the conditions of stress relaxation characteristics；The experimental rig and analysis side that metal sealing stress relaxation of the present invention accelerates
Method can be greatly shortened by carrying out short period test analysis, verifying the sealing performance in the case of metal sealing is used for a long time
Test period and cost.
Detailed description of the invention
Fig. 1 is the experimental rig structural schematic diagram that a kind of metal sealing stress relaxation of the present invention accelerates；
In figure: 1, lower flange；2, downstairs axis；3, metal o-ring sample；4, upper flange；5, sample pedestal；6, constant temperature
Bottom seat；7, thermometer；8, high-temperature cable；9, common cable；10, stress-strain test system；11, high temperature strain foil；12, it presses
Lid；13, load sensor；14, studs；15, sleeve；16, upper multi-diameter shaft；17, constant temperature box cover；18, screw rod；19, snail
Worm and gear；20, motor；21, motor base.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, the experimental rig that a kind of metal sealing stress relaxation accelerates, including lower flange 1, upper flange 4, constant temperature
Bottom seat 6, gland 12, load sensor 13, turbine and worm 19 and motor 20, wherein put on 6 inner bottom surface of insulating box pedestal
It is equipped with the sample pedestal 5 of the internal cylindrical structure for being provided with stepped hole, the lower flange 1 of disc-shaped structure passes through 2 cloth of downstairs axis
It is placed on 5 interior lower end face of sample pedestal；It is provided with annular groove on 1 upper surface of lower flange, and is placed in the annular groove
There is the metal sealing sample 3 of annular, is placed with similar to 1 structure of lower flange and is parallel to each other upper on metal sealing sample 3
Flange 4, and the upper multi-diameter shaft 16 symmetrical with downstairs axis 2 is installed in 4 upper surface of upper flange；In upper 16 upper end of multi-diameter shaft
Face is provided with threaded hole, is passed through the studs 14 for the sleeve 15 arranged in constant temperature box cover 17 on insulating box pedestal 6, and one
End is connected with the threaded hole of upper 16 upper end of multi-diameter shaft, and the other end is threadedly coupled with the gland 12 of slab construction, and in gland 12
It is provided with load sensor 13 between 17 center of constant temperature box cover, the temperature for passing through and being mounted in constant temperature box cover 17
Meter 7 can show the temperature inside insulating box with real-time measurement；The high temperature strain foil 11 for being mounted on 1 annular groove bottom of lower flange exists
It is connected positioned at insulating box pedestal 6 with the high-temperature cable 8 in 17 space of constant temperature box cover, after high-temperature cable 8 passes through insulating box, leads to
It crosses common cable 9 to be connected with stress-strain test system 10, and seals corresponding wire guide using sealant；With turbine and worm
19 motors 20 being connected are mounted on motor base 21, and the screw rod 18 in turbine and worm 19 and 12 upper surface center of gland
Bulge-structure is connected.
Motor 20 passes through turbine and worm 19 in the experimental rig that a kind of metal sealing stress relaxation of the present invention accelerates
Transmission driving screw rod 18, and drives gland 12, studs 14 and upper multi-diameter shaft to move up and down, by load by gland 12,
Studs and upper multi-diameter shaft are applied on flange, decrement needed for making metal o-ring sample 3 reach test, to determine gold
Belong to sealing ring and realizes axial load required for preferable sealing effect.
The analysis method that a kind of metal sealing stress relaxation of the present invention accelerates, this method specifically include following step
It is rapid:
Step 1, the experimental rig accelerated using above-mentioned metal sealing stress relaxation, are arranged the test temperature in insulating box,
Obtain the test data that residual contact stress changes over time；
The test temperature in insulating box is arranged in the experimental rig accelerated using metal sealing stress relaxation of the present invention
For T, the test for obtaining the residual contact stress of metal o-ring sample and changing over time is acquired by stress-strain test system
Data, and multiple test temperatures are set and are tested, at a temperature of obtaining different tests, the remaining contact of metal o-ring sample is answered
The test data that power changes over time；
Step 2 analyzes the test data in step 1, determines the characteristic value for accelerating metal sealing in characteristic parameter,
And make stress relaxation test data that there is good linear dependence；
Characteristic parameter LMP will be accelerated to be defined as having with metal sealing stress relaxation characteristics and test period, test temperature
The parameter of pass, expression formula are as follows:
LMP (T, t)=T (C+log10(t))
Wherein, C is the characteristic value of metal sealing；
Correlation analysis is carried out two-by-two using the multiple groups test data in step 1, and determines the number of the characteristic value C of metal sealing
Value makes the stress relaxation test data indicated with parameter LMP have good linear dependence；
Step 3 carries out linear regression processing to test data, obtains the stress relaxation kinetics equation of metal sealing；
Linear regression processing is carried out using the test data of step 2, then the stress relaxation kinetics equation of metal sealing are as follows:
Y2R(t)=A1-B1LMP(T,t)
Wherein, Y2RIt (t) is residual contact stress；A1For initial load coefficient；B1For stress relaxation rate coefficient, B1It is and material
Material, the related constant of experimental condition, can be sought by the regression analysis to test data.
The test data that residual contact stress under the different temperatures of test acquisition is changed over time obtains final for people
Stress relaxation kinetics equation are as follows:
Y2R(T, t)=K (T)-C (T) (log10 (t))
Wherein, Y2R(T, t) is remaining contact stress；K (T), C (T) are constant related with material, experimental condition, can be led to
The calculating of overstress relaxation test data, which is analyzed, to be obtained；
It, can be with the stress relaxation under forecast analysis different temperatures and time conditions using above-mentioned stress relaxation kinetics equation
Situation.
Claims (7)
1. a kind of metal o-ring flange connection stress relaxation test device, it is characterised in that: the experimental rig includes base
Seat (14), upper flange (4), lower flange (1), gland (10) and load sensor and its measuring system (11), wherein disk knot
Lower flange (1) matching of structure is sealingly mounted on the pedestal (14) of cylinder shape inner wall, and it is recessed to be provided with annular in lower flange (1) upper surface
Slot, and metal o-ring sample (9) are placed in the groove, upper flange (4) matching being located on metal o-ring sample (9)
It is sealed on the cylinder shape inner wall of pedestal (14)；Load cell and its measuring system are placed in upper flange (4) center
(11), and on load cell and its measuring system (11) it is equipped with the gland parallel with upper flange (4), lower flange (1)
(10), the bolt (6) and nut (5) for and by several sequentially passing through lower flange (1), upper flange (4) and gland (10) compress
It is fixed.
2. a kind of metal o-ring flange connection stress relaxation test device according to claim 1, feature exist
In: described lower flange (1) the lower end center protrudes outward aperture, and is fixedly connected with the pressure inlet B (22) of center opening；Under
It is provided with hole on pedestal (14) side wall between flange (1) and upper flange (4), and is fixed with pressure inlet A (15) outside pedestal (14),
Pressure inlet A (15) is set to match with pedestal (14) side wall aperture.
3. a kind of metal o-ring flange connection stress relaxation test device according to claim 2, feature exist
In: in lower flange (1) upper surface annular groove be equipped with several bare optical fibers and bare optical gratings sensors (19), and with bare fibre light
The fiber-optic grating sensor conducting wire (16) that gate sensor (19) is connected is pacified in the aperture and aperture of pedestal (14) side wall
After the pressure inlet A (15) of dress, it is connected with fiber grating test macro (17).
4. a kind of metal o-ring flange connection stress relaxation test device according to claim 1, feature exist
In: lower flange (1) upper surface outer rim is provided with several grooves, and is equipped with current vortex sensor (18) in a groove,
And the current vortex sensor conducting wire (21) being connected with each current vortex sensor (18) passes through under lower flange (1) and pedestal (14)
After the circular hole at end, it is connected with Eddy Inspection System (20), meanwhile, utilize the wire guide in sealant sealing lower flange (1).
5. a kind of metal o-ring flange connection stress relaxation test device according to claim 1, feature exist
In: thousand points for being additionally provided with dial indicators rack (13) on described pedestal (14) upper surface, and being installed on dial indicators rack (13)
Table (12) thimble and gland (10) upper surface gentle touchdown.
6. a kind of metal o-ring flange connection stress relaxation test device according to claim 1, feature exist
It opens that there are two parallel annular grooves in: described pedestal (14) inner wall, and is equipped with sealing ring A (2) and sealing ring B in a groove
(3), upper flange (4) and lower flange (1) are mutually sealed by sealing ring B (3) and sealing ring A (2) with pedestal (14) respectively.
7. a kind of metal o-ring flange connection stress relaxation test device according to claim 1, feature exist
In: the bolt (6) sequentially passes through lower flange (1), upper flange (4) and gland (10), by covering in gland (10) upper end
Plain cushion (8), spring washer (7) and nut (5) in bolt section, metal o-ring sample (9) is fixed.
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| CN201610429865.9A CN106645625B (en) | 2016-06-16 | 2016-06-16 | A kind of experimental rig and analysis method of the acceleration of metal sealing stress relaxation |
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| CN201610429865.9A CN106645625B (en) | 2016-06-16 | 2016-06-16 | A kind of experimental rig and analysis method of the acceleration of metal sealing stress relaxation |
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| CN107478386B (en) * | 2017-09-07 | 2023-10-20 | 重庆科技学院 | Method for testing high-temperature contact stress relaxation of special thread sealing surface |
| CN109507015B (en) * | 2018-12-18 | 2021-11-30 | 上海航天化工应用研究所 | Five-station solid propellant normal-high temperature stress relaxation test device and method |
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| CN101446510A (en) * | 2008-12-23 | 2009-06-03 | 南京工业大学 | Multi-functional multi-specimen sealing gasket service life evaluation testing apparatus |
| CN103364262A (en) * | 2013-07-06 | 2013-10-23 | 郑州大学 | Combined experimental device for polymer environmental stress cracking |
| JP2014035842A (en) * | 2012-08-07 | 2014-02-24 | Toshiba Corp | Resin-molded vacuum valve |
| CN104074978A (en) * | 2013-03-29 | 2014-10-01 | 日本华尔卡工业株式会社 | Evaluation method of surface pressure maintaining of fluororesin gasket used for tubing sealing |
| CN204630806U (en) * | 2015-04-07 | 2015-09-09 | 昆明理工大学 | A kind of plastic inspection well axial load experiment detection device |
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2016
- 2016-06-16 CN CN201610429865.9A patent/CN106645625B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446510A (en) * | 2008-12-23 | 2009-06-03 | 南京工业大学 | Multi-functional multi-specimen sealing gasket service life evaluation testing apparatus |
| JP2014035842A (en) * | 2012-08-07 | 2014-02-24 | Toshiba Corp | Resin-molded vacuum valve |
| CN104074978A (en) * | 2013-03-29 | 2014-10-01 | 日本华尔卡工业株式会社 | Evaluation method of surface pressure maintaining of fluororesin gasket used for tubing sealing |
| CN103364262A (en) * | 2013-07-06 | 2013-10-23 | 郑州大学 | Combined experimental device for polymer environmental stress cracking |
| CN204630806U (en) * | 2015-04-07 | 2015-09-09 | 昆明理工大学 | A kind of plastic inspection well axial load experiment detection device |
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