CN106153472A - A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads - Google Patents
A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads Download PDFInfo
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- CN106153472A CN106153472A CN201610439366.8A CN201610439366A CN106153472A CN 106153472 A CN106153472 A CN 106153472A CN 201610439366 A CN201610439366 A CN 201610439366A CN 106153472 A CN106153472 A CN 106153472A
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The present invention relates to a kind of realize the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads.This system includes: high-temperature mechanics loading system, in order to provide hot environment and axial load；Intrinsic pressure loading system, in order to provide the gas of certain pressure in the pipeline of sample, forms inner pressuring load, and is provided with unloader in order to pressure release；Strain on-line detecting system, high temperature resistance foil gauge point is welded in specimen surface, and be connected with strain acquirement instrument by wire, strain acquirement instrument is connected to computer, by the resistance change measuring high temperature resistance foil gauge, the strain of sample is carried out on-line checking and calculating.The present invention is capable of inner pressuring load and tensile load loads simultaneously, the high temperature multi-axial creep behavioral study of lower material is jointly acted on for inner pressuring load and tensile load, by controlling inner pressuring load and the size of tensile load, thus study the impact on material creep behavior of the multiaxis degree, thus accurately disclose material creep Evolution under multiaxis degree stress state.
Description
Technical field
The invention belongs to the high temperature multi-axial creep experimental technique field of material, realize intrinsic pressure and stretching group particularly to one
Close the multi-axial creep pilot system and method loaded.
Background technology
Development high parameter, jumbo super (super-) critical coal-fired power generator set be reduce CO2 emission most economical
Effective approach.Along with the raising of steam parameter, the safety and reliability of super (super-) critical unit critical component material is carried
Go out higher requirement.The main form that high-temperature component destroys is creep, therefore when super (super-) critical unit design selection,
Must take into the croop property of material.Super (super-) critical unit boiler high temperature critical component, such as, the superheater of boiler, reheating
Device, main steam line etc., or because by the common effect of multiple load or because self geometry irregular, big portion
Dividing all in multi-axis stress state, this multi-axis stress state affects the creep life of material.Mostly use during current design
The creep data being in uniaxial stress state, have a practical situation differed from residing for material, material actual life is than the design longevity
Life differs greatly.Accordingly, it would be desirable to the creep behaviour of high-temperature material under research multi-axis stress state, understand that power plant's high-temperature component exists
The mechanism of creep failure under multi-axis stress state.The existing research method in this field cannot react high-temperature component material at height at present
Multi-axial creep evolutionary process under Wen, thus cannot correctly assess the impact on its life-span of the multiaxis degree.Inspection information finds, at present
Existing multi-axial creep experimental system or can not accurately control the change of multiaxis degree, or cannot be close to the true feelings of field components
Condition.
Summary of the invention
Not enough for prior art, the invention provides and a kind of realize the multi-axial creep test that intrinsic pressure and stretching combinations loads
System and method.
A kind of realize the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, including high-temperature mechanics loading system, interior
Pressure loading system and strain on-line detecting system；
Described high-temperature mechanics loading system is in order to provide hot environment and axial load；
Described intrinsic pressure loading system, in order to provide the gas of certain pressure in the pipeline of sample, forms inner pressuring load, and
It is provided with unloader in order to pressure release；
Described strain on-line detecting system, high temperature resistance foil gauge point is welded in specimen surface, and is adopted with strain by wire
Collection instrument is connected, and strain acquirement instrument is connected to computer, is answered sample by the resistance change measuring high temperature resistance foil gauge
Become and carry out on-line checking and calculating.
Preferably, at specimen surface, along the axial and circumferential spot welding high temperature resistance foil gauge respectively of pipeline.
Described high-temperature mechanics loading system includes stretching-machine, and the heating furnace of stretching-machine is the tube furnace of hollow, sample upper
Lower two ends are connected with upper connecting rod and the lower link of stretching-machine and are arranged in heating furnace respectively, are stretched by upper connecting rod and lower link
Sample, forms axial load.
Described intrinsic pressure loading system, gas cylinder, valve, booster pump, high-pressure stop valve, Pressure gauge and sample are by pipeline successively
Connect and form intrinsic pressure loading path；Threeway is set between booster pump and high-pressure stop valve and connects the first unloader；High-pressure stop valve
And threeway is set between Pressure gauge and connects the second unloader.
The two ends up and down of described sample connect top connection and lower contact respectively, and air induction conduit connects through described lower contact
Inside sample.
Preferably, at the pipeline of sample built with filler rod, to fill sample inner space and the safety of guarantee test.
Preferably, the external diameter 1-2mm less than the internal diameter of the light-wall pipe of sample of described filler rod, length is less than the length of sample
1-2mm。
It is further preferred that described filler rod uses the material identical with sample.
Described gas is noble gas, it is ensured that its at high temperature stable performance.
A kind of realizing the multi-axial creep test method that intrinsic pressure and stretching combinations loads, sample is arranged on high-temperature mechanics and loads system
On system, high-temperature mechanics loading system provide hot environment and axial load；Intrinsic pressure loading system provides in the pipeline of sample
The gas of certain pressure, forms inner pressuring load to the inwall of sample；Formed by the size changing inner pressuring load and axial load
Different multiaxis degree stress；Along with sample deforms, strain acquirement instrument online acquisition specimen surface high temperature resistance foil gauge
Resistance change, and transfer data to computer and carry out online record and calculating and process.
The invention have the benefit that
The present invention can realize intrinsic pressure and two kinds of load modes of stretching simultaneously, can be used for inner pressuring load and tensile load is common
The high temperature multi-axial creep behavioral study of the lower material of effect, by controlling inner pressuring load and the size of tensile load, thus accurately controls
Multiaxis degree processed changes, and studies the impact on material creep behavior of the multiaxis degree, thus accurately discloses material in multiaxis degree stress state
Under creep Evolution；The temperature of the present invention can arrive more than 600 DEG C, intrinsic pressure can reach more than 25MPa, it is possible to true
Simulation super (super-) critical unit operating temperature and pressure, the effective high temperature creep property reacting actual pressure-containing member material, for
The safe and reliable operation of the actual equipment bearing inner pressuring load provides theoretical foundation.
The present invention passes through to install filler rod inside sample additional, use noble gas generation is intrinsic pressure, arrange load releasing valve to ensure
The safety of test.
Accompanying drawing explanation
Fig. 1 is a kind of overall structure schematic diagram realizing the intrinsic pressure multi-axial creep pilot system with stretching combinations loading；
Fig. 2 is sample structure schematic diagram；
Fig. 3 is the partial structurtes schematic diagram that sample loads position.
Label declaration: 1-upper connecting rod；2-heating furnace；3-sample；4-light-wall pipe；5-air induction conduit；6-lower link；7-is spherical
Connect seat；8-handwheel；9-balance weight；10-column；The upper stove of 11-blocks up；12-top connection；13-high temperature resistance foil gauge；14-fills
Rod；15-lower contact；Under 16-, stove blocks up；17-control station；18-gas cylinder；19-valve；20-booster pump；21-the first unloader；22-
High-pressure stop valve；23-the second unloader；24-Pressure gauge；25-strain acquirement instrument；26-computer.
Detailed description of the invention
The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.It is emphasized that the description below
That be merely exemplary rather than in order to limit the scope of the present invention and application thereof.
A kind of realize the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, add including high-temperature mechanics
Loading system, intrinsic pressure loading system and strain on-line detecting system；
Described high-temperature mechanics loading system is in order to provide hot environment and axial load；It includes stretching-machine, stretching-machine
Heating furnace 2 is the tube furnace of hollow, is fixed on the left and right pillar 10 of stretching-machine；Stretching-machine top is equipped with balance weight 9, balance weight
9 are connected with leveling machine, control station 17 control leveling machine and carry out leveling.The ball-joint seat 7 of upside is connected below balance weight 9,
The upper end of upper connecting rod 1 is connected with the ball-joint seat 7 of upside, and lower end is blocked up 11 through upper stove and stretched in heating furnace 2；Lower link 6
Upper end is blocked up 16 stretch in heating furnace 2 through lower stove, and lower end is connected with the ball-joint seat 7 of downside, the ball-joint seat 7 of downside and
Handwheel 8 is connected, and handwheel 8 is connected to the hydraulic system of stretching-machine；The lower end of upper connecting rod 1 and the upper end of lower link 6 are equipped with clamping
Part, for the fixing of sample 3 and loaded load.
Described intrinsic pressure loading system, in order to provide the gas of certain pressure in the pipeline of sample 3, forms inner pressuring load, and
It is provided with unloader in order to pressure release.
Described strain on-line detecting system, high temperature resistance foil gauge 13 is welded in sample 3 surface, and by wire and strain
Acquisition Instrument 25 is connected, and strain acquirement instrument 25 is connected to computer 26, by measuring the resistance change of high temperature resistance foil gauge 13
Strain to sample 3 carries out on-line checking and calculating.
A kind of method of work realizing the intrinsic pressure multi-axial creep pilot system with stretching combinations loading of following description.
(1) as in figure 2 it is shown, the middle part of sample 3 is light-wall pipe 4, Type of Welding is passed through in one end of top connection 12 with sample 3
Connecting, air induction conduit 5 is passed through in sample 3 through described lower contact 15, and by lower contact 15 with air induction conduit 5 by welding shape
Formula connects, and filler rod 14 is put into sample 3 internal, to fill sample 3 inner space and the safety of guarantee test, wherein, and one
Kind of preferred version is, described filler rod 14 uses the material identical with sample 3, and the external diameter of filler rod is than the light-wall pipe of sample
The little 1-2mm of internal diameter, length 1-2mm less than the length of sample.Then the other end of lower contact 15 with sample 3 is passed through Type of Welding
Connect；By 13 middle part surfaces being welded in light-wall pipe 4 of high temperature resistance foil gauge, along the axial and circumferential spot welding high temperature respectively of pipeline
Resistance strain gage 13；
(2) as it is shown on figure 3, respectively by upper connecting rod 1 and the lower link of the top connection 12 of sample 3 and lower contact 15 and stretching-machine
6 are connected by thread forms, thus are arranged on by sample 3 in the middle part of heating furnace 2, and the thermocouple of heating furnace 2 is bundled in sample 3
On；
(3) one end of wire connects high temperature resistance foil gauge 13, and the other end connects strain acquirement instrument 25, and by strain acquirement
Instrument 25 is connected with computer 26；
(4) gas cylinder 18 is connected with booster pump 20 by valve 19, by the outlet of booster pump 20 by three way cock respectively
It is connected with the first unloader 21 and high-pressure stop valve 22, high-pressure stop valve 22 and the second unloader 23 three are connected by another
Head entrance with Pressure gauge 24 respectively is connected, and outlet and the air induction conduit 5 of Pressure gauge 24 is connected, completes intrinsic pressure loading system
Connect, form intrinsic pressure loading path；
(5) setting test parameters by Heating Furnace Control device, heating furnace 2 begins to warm up；Treat that temperature conditions meets stretching
Requirement of experiment, initially axially loads, and stretching-machine passes through upper connecting rod 1 and lower link 6 tensile sample 3, forms constant axial load；
(6) close the first unloader 21 and the second unloader 23, Open valve 19 and high-pressure stop valve 22, open booster pump
20 and regulate pressure size, it is passed through in sample 3 by air induction conduit 5 after noble gas intensified pump 20 supercharging, Pressure gauge 24 registration
After reaching experiment value and keeping stablizing, close valve 19 and high-pressure stop valve 22；Now, the inwall at sample 3 is formed constant
Inner pressuring load；
(7) due to by axial tension and intrinsic pressure effect, sample 3 weakness being under high temperature, i.e. light-wall pipe 4, meeting
There is the deformation of creep.Along with light-wall pipe 4 deforms, the resistance value of strain acquirement instrument 25 online acquisition high temperature resistance foil gauge 13
Change, and transfer data to computer 26 and carry out online record and calculating and process；
(8) by regulation stretching-machine and booster pump 20, change axial load and the size of inner pressuring load, thus form difference
Multiaxis degree stress with study multiaxis degree impact；
(9) end to be tested, after heating furnace 2 temperature drops to room temperature, discharges sample 3 internal high pressure by the second relief valve 23
Gas, discharges the gas within connecting tube by the first relief valve 21.
Claims (10)
1. one kind realizes the intrinsic pressure and multi-axial creep pilot system of stretching combinations loading, it is characterised in that include that high-temperature mechanics adds
Loading system, intrinsic pressure loading system and strain on-line detecting system；
Described high-temperature mechanics loading system is in order to provide hot environment and axial load；
Described intrinsic pressure loading system, in order to provide the gas of certain pressure in the pipeline of sample, forms inner pressuring load, and is provided with
Unloader is in order to pressure release；
Described strain on-line detecting system, high temperature resistance foil gauge point is welded in specimen surface, and by wire and strain acquirement instrument
Being connected, strain acquirement instrument is connected to computer, is entered the strain of sample by the resistance change measuring high temperature resistance foil gauge
Row on-line checking and calculating.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, at specimen surface, along the axial and circumferential spot welding high temperature resistance foil gauge respectively of pipeline.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, described high-temperature mechanics loading system includes stretching-machine, and the heating furnace of stretching-machine is the tube furnace of hollow, the two ends up and down of sample
It is connected with upper connecting rod and the lower link of stretching-machine and is arranged in heating furnace respectively, by upper connecting rod and lower link tensile sample,
Form axial load.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, described intrinsic pressure loading system, gas cylinder, valve, booster pump, high-pressure stop valve, Pressure gauge and sample are sequentially connected with by pipeline
Form intrinsic pressure loading path；Threeway is set between booster pump and high-pressure stop valve and connects the first unloader；High-pressure stop valve and pressure
Threeway is set between power table and connects the second unloader.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, the two ends up and down of described sample connect top connection and lower contact respectively, and air induction conduit connects sample through described lower contact
Internal.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, at the pipeline of sample built with filler rod, to fill sample inner space and the safety of guarantee test.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, the external diameter 1-2mm less than the internal diameter of the light-wall pipe of sample of described filler rod, length 1-2mm less than the length of sample.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, described filler rod uses the material identical with sample.
A kind of realizing the multi-axial creep pilot system that intrinsic pressure and stretching combinations loads, its feature exists
In, described gas is noble gas, it is ensured that its at high temperature stable performance.
10. a kind of multi-axial creep test system realizing that intrinsic pressure and stretching combinations loads described in claim 1-9 any claim
The test method of system, it is characterised in that sample is arranged in high-temperature mechanics loading system, is provided height by high-temperature mechanics loading system
Temperature environment and axial load；Intrinsic pressure loading system provides the gas of certain pressure in the pipeline of sample, the inwall shape to sample
Become inner pressuring load；Different multiaxis degree stress is formed by the size changing inner pressuring load and axial load；Along with sample occurs
Deformation, the resistance change of strain acquirement instrument online acquisition specimen surface high temperature resistance foil gauge, and transfer data to calculate
Machine carries out online record and calculating processes.
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| CN201610439366.8A CN106153472A (en) | 2016-06-17 | 2016-06-17 | A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads |
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| CN201610439366.8A CN106153472A (en) | 2016-06-17 | 2016-06-17 | A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads |
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| CN107607410A (en) * | 2017-10-18 | 2018-01-19 | 吉林大学 | Portable alternating temperature original position tension/compression testing device |
| CN107607409A (en) * | 2017-09-27 | 2018-01-19 | 吉林大学 | The biaxial stretch-formed compression verification device of superhigh temperature complex load |
| CN107703003A (en) * | 2017-11-10 | 2018-02-16 | 吉林大学 | Superhigh temperature biaxial stretch-formed compression fatigue test platform in situ |
| CN107817167A (en) * | 2017-12-05 | 2018-03-20 | 中国航空综合技术研究所 | Pipeline fitting bonding strength test device and its method of testing |
| CN107870120A (en) * | 2017-10-16 | 2018-04-03 | 太原理工大学 | For simulating sophisticated loading device of the roadway surrounding rock in the case where ore deposit presses collected state |
| CN108007791A (en) * | 2017-08-08 | 2018-05-08 | 南方科技大学 | Multi-station creep test device and method |
| CN108037014A (en) * | 2017-12-08 | 2018-05-15 | 北京强度环境研究所 | A kind of multimedium ultralow pressure pressure-loaded pilot system |
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| CN109342212A (en) * | 2018-10-15 | 2019-02-15 | 西北工业大学 | Superhigh temperature fatigue experimental device and its fixture |
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| WO2021258550A1 (en) * | 2020-06-23 | 2021-12-30 | 西安热工研究院有限公司 | Automatic pressure control type internal pressure creep blasting test device and method |
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| CN107870120A (en) * | 2017-10-16 | 2018-04-03 | 太原理工大学 | For simulating sophisticated loading device of the roadway surrounding rock in the case where ore deposit presses collected state |
| CN107607410A (en) * | 2017-10-18 | 2018-01-19 | 吉林大学 | Portable alternating temperature original position tension/compression testing device |
| CN107703003B (en) * | 2017-11-10 | 2024-02-02 | 吉林大学 | Ultra-high temperature in-situ biaxial stretching compression fatigue test platform |
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| CN113865984A (en) * | 2021-08-19 | 2021-12-31 | 中国原子能科学研究院 | Vacuum/inert gas protection test device suitable for radioactive tubular sample |
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| CN113866002B (en) * | 2021-10-11 | 2024-01-23 | 中国特种设备检测研究院 | Constant stress loading system and method for micro-sample creep property bulge test |
| CN114136796A (en) * | 2021-11-22 | 2022-03-04 | 浙江工业大学 | High-temperature external-pressure creep buckling experiment platform and method for stainless steel container |
| CN114279823A (en) * | 2021-12-13 | 2022-04-05 | 中机试验装备股份有限公司 | Creep test device and test fixture for in-band pressure pipe sample |
| CN116202870A (en) * | 2023-02-17 | 2023-06-02 | 上海交通大学 | Test device for in-situ research of cracking and failure of surface coating of thin-wall pipe |
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