CN104251798A - High-strength bolt delayed fracture test method and apparatus thereof - Google Patents
High-strength bolt delayed fracture test method and apparatus thereof Download PDFInfo
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- CN104251798A CN104251798A CN201310259349.2A CN201310259349A CN104251798A CN 104251798 A CN104251798 A CN 104251798A CN 201310259349 A CN201310259349 A CN 201310259349A CN 104251798 A CN104251798 A CN 104251798A
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Abstract
The invention relates to the field of bolt quality control, and especially relates to a method for examining a bolt under simulated actual use conditions, and an apparatus thereof. A high-strength bolt delayed fracture test method comprises the following steps: applying a constant tensile force F to a tested bolt according to the service environment of the tested bolt, simulating the service environment of the tested bolt, and determining the corrosion current density iS under the service environment; and changing the medium solution, the atmosphere and the temperature in an environment container, carrying out acceleration test, determining the corrosion current density iA, calculating to obtain a speed-up ratio, and carrying out acceleration test by using changed parameters to obtain the delay fracture resistance. A high-strength bolt delayed fracture test apparatus comprises a pressure ring and the environment container, the tested bolt is arranged in the environment container, and two ends of the tested bolt are fixedly connected with the pressure ring. The high-strength method and the apparatus thereof can be used for evaluating the delayed fracture resistance of the bolt under the stimulated actual service conditions of the bolt, and predicting the actual service life of the bolt in an acceleration test medium.
Description
Technical field
The present invention relates to bolt field of quality control, particularly relate to a kind of bolt at the method for inspection simulated under actual applying working condition and device.
Background technology
The high-strength bolt used in industrial atmosphere, marine atmosphere and marine environment often faces the problem of delayed fracture, delayed fracture refers to that bolt is on active service under effect of stress and the phenomenon of brittle fracture occurred suddenly after a period of time, correlative study shows that delayed fracture is reacted by the corrosion electrochemistry that occurs in bolt under arms process to cause inside to ooze hydrogen causing, and the creep of the alternate load that this outer bolt bears in process under arms and material is also the key factor promoting delayed fracture.In order to evaluate high-strength bolt especially more than 12.9 grades high-strength bolts, domestic and international research institution develops a series of evaluation method.
JP2007199024, JP07229819A to immerse after describing respectively and being loaded by entity bolt in corrosive medium thus bolt material are carried out to the method for anti-delayed fracture performance evaluation, this method is closer to the actual service state of bolt, but accurately cannot measure that bolt is actual to meet with stresses, probably occur the phenomenons such as overload.
CN201010216414.X and CN200810049411.4 describes a kind of method evaluated the anti-delayed fracture performance of bolt by finite element method for simulating, and the method is by the stress concentration factor K of thread root under the effect of calculating tensile load
t, and then calculate stress strength factor K
i, recycling fracturing mechanics criterion fracture toughness K
iSCC>=n*K
idetermine the toughness index that bolt is used safely under air and marine environment.The method to be evaluated from the angle of fracture toughness bolt performance has certain science, but the method comparatively loaded down with trivial details, be not easy to carry out evaluation test in enormous quantities.
Summary of the invention
The object of the present invention is to provide a kind of high-strength bolt delayed fracture test method and device, the method and device can test the anti-delayed fracture performance of tested bolt in the test(ing) medium of simulation actual condition, and use accelerated test method to assess the actual service life of bolt.
The present invention is achieved in that a kind of high-strength bolt delayed fracture test method, first applies constant tensile force f according to the Service Environment of tested bolt to tested bolt, and is placed in environmental chamber by tested bolt; Then in environmental chamber, add the test(ing) medium of simulation actual condition, pass into simulated atmosphere and temperature in adjusting ambient container to simulate the Service Environment of tested bolt, use potentiostat to measure the corrosion electric current density i of tested bolt under arms under environment by linear polarization method
s; Then medium solution, atmosphere and the temperature changed in environmental chamber carries out accelerated test to increase current density, and again measures tested bolt with potentiostat by linear polarization method, obtains the corrosion electric current density i under accelerated test
a; Finally calculate accelerated test speed-up ratio RA=i
a/ i
s, utilize medium solution, atmosphere and the temperature after changing, with tensile force f, accelerated test carried out to tested bolt, obtain the anti-delayed fracture performance of tested bolt under arms under environment.
Selected accelerated corrosion atmosphere and accelerated corrosion temperature make accelerated test speed-up ratio RA be 100 ~ 200.
Describedly constant pulling force is applied to tested bolt be specially tested bolt is fixedly mounted in pressure rings, utilize the elastic-restoring force of pressure rings to apply constant pulling force to tested bolt, value of thrust obtains according to the decrement of the compressive load deflection curve adjustment pressure rings of pressure rings.
A kind of high-strength bolt delayed fracture test unit, comprise pressure rings and environmental chamber, the axle center place of described environmental chamber top cover and base plate is all provided with sample aperture, described pressure rings is enclosed within outside environmental chamber, tested bolt is arranged in environmental chamber, and the sample aperture that the two ends of tested bolt are each passed through top cover and base plate is by loading nut and pressure rings is fixedly linked; The top cover of environmental chamber is also provided with gas medium input channel, heat eliminating medium input channel, gas medium output channel, environmental chamber is built with well heater and temperature sensor.
Described environmental chamber is cylindrical tube.
This experimental provision and method accurately apply required stress to bolt material, can evaluate, and carry out anti-delayed fracture performance contrast between different materials under simulation bolt actual military service working condition to the anti-delayed fracture performance of bolt; Also by the corrosion electric current density of electrochemical method determining bolt material in actual military service work condition environment and accelerated test medium, obtain accelerated test speed-up ratio, utilize accelerated test to assess the service life of tested bolt.
Accompanying drawing explanation
Fig. 1 is the structural representation of high-strength bolt delayed fracture test unit of the present invention;
Fig. 2 is the structural representation of environmental chamber in the present invention;
Fig. 3 is pressure rings compressive load-deflection curve in the embodiment of the present invention.Ordinate is tensile force f, and horizontal ordinate is compress variation Δ H
In figure: 1 pressure rings, 2 tested bolts, 3 environmental chamber, 4 load nut, 5 gas medium input channels, 6 heat eliminating medium input channels, 7 gas medium output channels, 8 well heaters, 9 sample aperture, 10 temperature sensors.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's statement.
A kind of high-strength bolt delayed fracture test method, first according to the Service Environment of tested bolt, constant tensile force f is applied to tested bolt, tested bolt is fixedly mounted in pressure rings, needed for tested bolt, Loading stress calculation goes out the stress that pressure rings needs to load, and calculates the compress variation Δ H needed for pressure rings according to proving ring compressive load-deflection opisometer as shown in Figure 3; Screw pressure rings two ends and load nut, use micrometer caliper to measure pressure rings and load anterior and posterior height H numerical value, make proving ring compress variation reach required Δ H; Again tested bolt is placed in environmental chamber; Then in environmental chamber, add the test(ing) medium of simulation actual condition, pass into simulated atmosphere and temperature in adjusting ambient container to simulate the Service Environment of tested bolt, use potentiostat to measure the corrosion electric current density i of tested bolt under arms under environment by linear polarization method
s; Then medium solution, atmosphere and the temperature changed in environmental chamber carries out accelerated test to increase current density, and again measures tested bolt with potentiostat by linear polarization method, obtains the corrosion electric current density i under accelerated test
a; Finally calculate accelerated test speed-up ratio RA=i
a/ i
s, utilize medium solution, atmosphere and the temperature after changing, with tensile force f, accelerated test carried out to tested bolt, obtain the anti-delayed fracture performance of tested bolt under arms under environment.
In the present invention, usually make accelerated test speed-up ratio RA be 100 ~ 200 by selected accelerated corrosion atmosphere and accelerated corrosion temperature, while ensureing conventional efficient, obtain best observation effect.
As shown in Figure 1, 2, a kind of high-strength bolt delayed fracture test unit, comprise pressure rings 1 and environmental chamber 3, described environmental chamber 3 is cylindrical tube, the top cover of environmental chamber 3 and the axle center place of base plate are all provided with sample aperture 9, described pressure rings 1 is enclosed within outside environmental chamber 3, and tested bolt 2 is arranged in environmental chamber 3, and the sample aperture 9 that the two ends of tested bolt 2 are each passed through top cover and base plate is fixedly linked with pressure rings 1 by loading nut 4; The top cover of environmental chamber 3 is also provided with gas medium input channel 5, heat eliminating medium input channel 6, gas medium output channel 7, environmental chamber 3 is built with well heater 8 and temperature sensor 10.
The present invention can further describe into, apply constant pulling force to tested bolt to be specially tested bolt is fixedly mounted in pressure rings, utilize the elastic-restoring force of pressure rings to apply constant pulling force to tested bolt, value of thrust obtains according to the decrement of the compressive load deflection curve adjustment pressure rings of pressure rings; Pressure rings 1 is that the corrosion-resistant material that ring-type is greater than 900Mpa by yield strength is made, tested bolt 2 is arranged on the axis of pressure rings 1, the two ends of tested bolt 2 are by adapter sleeve and load nut 4 or be directly fixed in pressure rings 1 by loading nut 4, because in the normal range of operation of pressure rings 1, the compress variation of the load that pressure rings 1 produces and pressure rings 1 is linear, so by testing pressure rings 1, pressure rings compressive load-deflection curve as shown in Figure 3 can be obtained; First go out according to tested Bolt sizes and required Loading stress calculation the force value that pressure rings needs to apply tested bolt when applying stress; Then compress variation Δ H needed for pressure rings is calculated according to pressure rings compressive load-deflection opisometer as shown in Figure 3; Then screw the loading nut at pressure rings two ends, use micrometer caliper to measure pressure rings and load anterior and posterior height numerical value, make pressure rings compress variation reach required Δ H.
Embodiment
The case study on implementation of the said equipment can be as shown in the table:
Claims (5)
1. a high-strength bolt delayed fracture test method, is characterized in that: first apply constant tensile force f according to the Service Environment of tested bolt to tested bolt, and be placed in environmental chamber by tested bolt; Then in environmental chamber, add the test(ing) medium of simulation actual condition, pass into simulated atmosphere and temperature in adjusting ambient container to simulate the Service Environment of tested bolt, use potentiostat to measure the corrosion electric current density i of tested bolt under arms under environment by linear polarization method
s; Then medium solution, atmosphere and the temperature changed in environmental chamber carries out accelerated test to increase current density, and again measures tested bolt with potentiostat by linear polarization method, obtains the corrosion electric current density i under accelerated test
a; Finally calculate accelerated test speed-up ratio RA=i
a/ i
s, utilize medium solution, atmosphere and the temperature after changing, with tensile force f, accelerated test carried out to tested bolt, obtain the anti-delayed fracture performance of tested bolt under arms under environment.
2. high-strength bolt delayed fracture test method as claimed in claim 1, is characterized in that: selected accelerated corrosion atmosphere and accelerated corrosion temperature make accelerated test speed-up ratio RA be 100 ~ 200.
3. high-strength bolt delayed fracture test method as claimed in claim 1, it is characterized in that: describedly constant pulling force is applied to tested bolt be specially tested bolt is fixedly mounted in pressure rings, utilize the elastic-restoring force of pressure rings to apply constant pulling force to tested bolt, value of thrust obtains according to the decrement of the compressive load deflection curve adjustment pressure rings of pressure rings.
4. a high-strength bolt delayed fracture test unit, it is characterized in that: comprise pressure rings (1) and environmental chamber (3), the axle center place of described environmental chamber (3) top cover and base plate is all provided with sample aperture (9), described pressure rings (1) is enclosed within environmental chamber (3) outward, tested bolt (2) is arranged in environmental chamber (3), and the sample aperture (9) that the two ends of tested bolt (2) are each passed through top cover and base plate is fixedly linked with pressure rings (1) by loading nut (4); The top cover of environmental chamber (3) is also provided with gas medium input channel (5), heat eliminating medium input channel (6), gas medium output channel (7), environmental chamber (3) is built with well heater (8) and temperature sensor (10).
5. high-strength bolt delayed fracture test unit as claimed in claim 4, is characterized in that: described environmental chamber (3) is cylindrical tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310259349.2A CN104251798A (en) | 2013-06-26 | 2013-06-26 | High-strength bolt delayed fracture test method and apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310259349.2A CN104251798A (en) | 2013-06-26 | 2013-06-26 | High-strength bolt delayed fracture test method and apparatus thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104251798A true CN104251798A (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310259349.2A Pending CN104251798A (en) | 2013-06-26 | 2013-06-26 | High-strength bolt delayed fracture test method and apparatus thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102015000867B3 (en) * | 2015-01-21 | 2016-05-12 | Vladimir Volchkov | Equipment for testing and testing for hydrogen embrittlement and stress corrosion cracking |
| CN106442282A (en) * | 2016-08-31 | 2017-02-22 | 西安摩尔石油工程实验室股份有限公司 | Constant load stress corrosion test device with load sensor |
| CN108444834A (en) * | 2018-02-11 | 2018-08-24 | 广州合成材料研究院有限公司 | Comprehensive accelerated ageing system |
| CN108801822A (en) * | 2018-05-08 | 2018-11-13 | 南京航空航天大学 | One kind preloading high-frequency vibration fatigue experimental device |
| CN109030196A (en) * | 2018-08-18 | 2018-12-18 | 深圳阿尔泰克轻合金技术有限公司 | A kind of metal material single shaft creep resistant test sample, fixture and method |
| CN109490120A (en) * | 2018-10-12 | 2019-03-19 | 海南核电有限公司 | A kind of main oil tank foundation bolt quality review method of in-service emergency diesel dynamo |
| CN109839309A (en) * | 2019-02-19 | 2019-06-04 | 中国第一汽车股份有限公司 | A kind of delayed fracture pilot system |
| CN110082201A (en) * | 2019-04-16 | 2019-08-02 | 浙江大学 | Material delayed fracture test method under high pressure hydrogen loading natural gas environment |
| CN112098206A (en) * | 2020-09-01 | 2020-12-18 | 合肥通用机械研究院有限公司 | Bolt stress corrosion test device and test method using same |
| CN114486714A (en) * | 2022-01-19 | 2022-05-13 | 杭州新坐标科技股份有限公司 | Trapezoidal potential acceleration test method for metal bipolar plate of fuel cell |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015000867B3 (en) * | 2015-01-21 | 2016-05-12 | Vladimir Volchkov | Equipment for testing and testing for hydrogen embrittlement and stress corrosion cracking |
| CN106442282A (en) * | 2016-08-31 | 2017-02-22 | 西安摩尔石油工程实验室股份有限公司 | Constant load stress corrosion test device with load sensor |
| CN108444834A (en) * | 2018-02-11 | 2018-08-24 | 广州合成材料研究院有限公司 | Comprehensive accelerated ageing system |
| CN108801822B (en) * | 2018-05-08 | 2020-07-14 | 南京航空航天大学 | Preload high-frequency vibration fatigue test device |
| CN108801822A (en) * | 2018-05-08 | 2018-11-13 | 南京航空航天大学 | One kind preloading high-frequency vibration fatigue experimental device |
| CN109030196A (en) * | 2018-08-18 | 2018-12-18 | 深圳阿尔泰克轻合金技术有限公司 | A kind of metal material single shaft creep resistant test sample, fixture and method |
| CN109030196B (en) * | 2018-08-18 | 2021-10-29 | 深圳阿尔泰克轻合金技术有限公司 | Metal material uniaxial creep resistance test sample, clamp and method |
| CN109490120A (en) * | 2018-10-12 | 2019-03-19 | 海南核电有限公司 | A kind of main oil tank foundation bolt quality review method of in-service emergency diesel dynamo |
| CN109839309A (en) * | 2019-02-19 | 2019-06-04 | 中国第一汽车股份有限公司 | A kind of delayed fracture pilot system |
| CN110082201A (en) * | 2019-04-16 | 2019-08-02 | 浙江大学 | Material delayed fracture test method under high pressure hydrogen loading natural gas environment |
| CN110082201B (en) * | 2019-04-16 | 2020-05-19 | 浙江大学 | Material delayed fracture test method under high-pressure hydrogen-doped natural gas environment |
| CN112098206A (en) * | 2020-09-01 | 2020-12-18 | 合肥通用机械研究院有限公司 | Bolt stress corrosion test device and test method using same |
| CN114486714A (en) * | 2022-01-19 | 2022-05-13 | 杭州新坐标科技股份有限公司 | Trapezoidal potential acceleration test method for metal bipolar plate of fuel cell |
| CN114486714B (en) * | 2022-01-19 | 2023-11-10 | 杭州新坐标科技股份有限公司 | Trapezoidal potential acceleration test method for fuel cell metal bipolar plate |
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Application publication date: 20141231 |