CN106053232A - Device and test method for testing circumferential fracture toughness of thin-wall pipe - Google Patents

Device and test method for testing circumferential fracture toughness of thin-wall pipe Download PDF

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Publication number
CN106053232A
CN106053232A CN201610572870.5A CN201610572870A CN106053232A CN 106053232 A CN106053232 A CN 106053232A CN 201610572870 A CN201610572870 A CN 201610572870A CN 106053232 A CN106053232 A CN 106053232A
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China
Prior art keywords
thin
wall pipes
fracture toughness
tool
hoop
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Pending
Application number
CN201610572870.5A
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Chinese (zh)
Inventor
郑晓静
贺平
高蔚
吴福
陈开媛
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Research Institute of Physical and Chemical Engineering of Nuclear Industry
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Research Institute of Physical and Chemical Engineering of Nuclear Industry
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Priority to CN201610572870.5A priority Critical patent/CN106053232A/en
Publication of CN106053232A publication Critical patent/CN106053232A/en
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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
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • 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
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0067—Fracture or rupture
    • 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
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0274—Tubular or ring-shaped specimens

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a device and test method for testing circumferential fracture toughness of a thin-wall pipe. The device comprises a disc-shaped clamping device, two connecting devices and fixing pins for fixing the clamping device and the connecting devices; the clamping device is divided into two semicircular slices with different sizes, and fixing holes are formed in both of the semicircular slices; each connecting device comprises a connecting handle and a Pi-shaped connector, the connecting handle is fixed with the center of a cross beam of the connector, and pin holes are formed in both of two side walls of the connector. The method comprises the following steps of: (i) measuring the size of the thin-wall pipe; (ii) mounting the device; (iii) prefabricating cracks;(iv) testing the circumferential fracture toughness; and (v) calculating the circumferential fracture toughness. According to the invention, annular specimen cracks are prefabricated without loss, the fracture toughness is tested through a simple tension test to avoid specimen defects brought about in a specimen bending process, and the circumferential fracture toughness of the thin-wall metal pipe can be accurately and directly tested.

Description

The device of test thin-wall pipes hoop fracture toughness and method of testing
Technical field
The invention belongs to a kind of sample experimental provision to fracture toughness, be specifically related to a kind of test thin-wall pipes hoop and break Split device and the method for testing of toughness.
Background technology
Minor diameter thin wall metal pipe material is as main components, and by circumference stress effect, only hoop fracture toughness is more Can the true stressing conditions of actual response.
In terms of the hoop Mechanics Performance Testing of thin-wall metal tube, there is no standard at present can depend on, need to explore voluntarily to grind Studying carefully, conventional tension test, all employ the sample that there is bending, sample, in loading procedure, is brought into because of the generation of bending moment Additional stress, has had a strong impact on the accuracy of test data, result also in cannot accurately judge production technology and mechanical property it Between rule, it is therefore desirable to design the experimental provision of a kind of special minor diameter thin wall metal pipe material hoop fracture toughness test.
Summary of the invention
The present invention proposes to overcome shortcoming present in prior art, its objective is to provide a kind of test thin-walled The device of tubing hoop fracture toughness and method of testing.
The technical scheme is that
A kind of device testing thin-wall pipes hoop tensile strength, accommodates tool, two connection tools including disc and blessing is had The steady pin fixing with being connected tool；Described blessing tool is divided into two unequal halfround bar slices of size, on every halfround bar slice all It is formed with fixing hole；The described tool that connects is made up of connection handle and " ㄇ " type union joint；Connection handle and the center of union joint crossbeam Fixing；The two side of union joint is respectively formed on pin-and-hole.
The axis of described pin-and-hole is vertical with the axis of connection handle.
Described blessing tool is placed in the gap of two " ㄇ " type union joints.
The described pin-and-hole center of circle is more than the fixing hole minimum to its halfround bar slice edge, place to the vertical dimension of union joint crossbeam Distance.
The method of testing of thin-wall pipes hoop fracture toughness, it is characterised in that: comprise the following steps:
The measurement of () thin-wall pipes size
Measure the width a of thin-wall pipes with digital display calliper, be accurate to 0.02mm；The thickness b of thin-wall pipes is measured, essence with micrometer Really to 0.005mm；
The installation of () device
Thin-wall pipes is placed on disc and accommodates tool outside, between thin-wall pipes and blessing tool, smear grease；Steady pin is depended on Secondary pin-and-hole on union joint sidewall and the fixing hole accommodated on tool, and then connection tool is fixed by steady pin with accommodating tool Connect；Connection handle is installed on fatigue machine, makes the center of thin-wall pipes active section be placed in the position parallel with loading direction；
() precrack
Precrack on fatigue machine, tired frequency is less than 100Hz, load ratio Pfmax/Pfmin=10, precrack length Control between 0.3W ~ 0.35W, and make at precrack, to be placed in the split place of blessing tool, record fatigue life cycle N；
For ring specimen Pfmax=6kN, Pfmin=600N, sheet specimens Pfmax=3kN, Pfmin=300N；
() hoop fracture toughness is tested
Breaking thin-wall pipes on cupping machine, draw speed is not more than 1mm/min, after thin-wall pipes fracture, and record maximum Load p max；After thin-wall pipes fracture, under reading microscope, measure crack length 2ac, be accurate to 0.01mm；
() hoop fracture toughness calculates
Thin-wall pipes hoop fracture toughness Kc, is calculated the hoop fracture toughness i.e. obtaining thin-wall pipes by formula (1),
... ... ... ... ... ... ... ... ... formula (1)；
In formula:
Kc plane stress toughness, unit is MPa m1/2；σ stress, unit is MPa；A crack length, unit is mm；F (a/w) thin-wall pipes geometrical form factors；
Wherein, the width correction factorCalculate by formula (2):
... ... formula (2)；
In formula:
F(ac/ w) thin-wall pipes geometrical form factors；acCritical crack length, unit is mm；W thin-wall pipes width, Unit is mm.
The invention has the beneficial effects as follows:
The present invention utilizes annular to accommodate tool can realize prefabricated ring specimen crackle under lossless case, real by simple extension test Existing fracture toughness test, it is to avoid the sample defect brought during bend specimen, can accurately, directly test thin metallic tubd Material hoop fracture toughness；In the case of using monitoring device, as high-speed motion picture camera etc. can record sample cracks can spread situation, this Device can also coordinate the strain curve of deformeter recordable sample stress.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation accommodating tool in the present invention；
Fig. 3 is the structural representation connecting tool in the present invention；
Fig. 4 be in Fig. 3 along A-A to profile.
Wherein:
1 accommodates tool 2 connection tool
3 steady pin 4 fixing holes
5 connection handle 6 union joints
7 pin-and-holes.
Detailed description of the invention
Below in conjunction with Figure of description and embodiment, the present invention is tested device and the survey of thin-wall pipes hoop fracture toughness Method for testing is described in detail:
As shown in Fig. 1 ~ 4, a kind of device testing thin-wall pipes hoop tensile strength, accommodate tool 1, two connection including disc Have 2 and have 2 fixing steady pins 3 by accommodating tool 1 with being connected；The described tool 1 that accommodates is divided into two equal-sized halfround bar slices, Every halfround bar slice has been respectively formed on fixing hole 4；The described tool 2 that connects is made up of connection handle 5 and " ㄇ " type union joint 6；Connection handle 5 with The center of union joint 6 crossbeam is fixed；The two side of union joint 6 is respectively formed on pin-and-hole 7.
The axis of described pin-and-hole 7 is vertical with the axis of connection handle 5.
The described tool 1 that accommodates is placed in the gap of two " ㄇ " type union joints 6.
Described pin-and-hole 7 center of circle to union joint 6 crossbeam vertical dimension more than fixing hole 4 to its halfround bar slice edge, place Small distance.
The method of testing of thin-wall pipes hoop fracture toughness, comprises the following steps:
The measurement of () thin-wall pipes size
Measure the width a=35.10mm of thin-wall pipes with digital display calliper, be accurate to 0.02mm；Thin-wall pipes is measured with micrometer Thickness b=1.5mm, is accurate to 0.005mm；
The installation of () device
Thin-wall pipes is placed on disc and accommodates tool 1 outside, between thin-wall pipes and blessing tool 1, smears grease；By steady pin 3 Sequentially pass through the pin-and-hole 7 on union joint 6 sidewall and the fixing hole 4 accommodated on tool 1, and then connection is had 2 and accommodates tool by solid Rationed marketing 3 is fixing to be connected；Connection handle 5 is installed on fatigue machine, makes the center of thin-wall pipes active section be placed in and loading direction Parallel position；
() precrack
Precrack on fatigue machine, tired frequency position 10Hz, load maximum, force Pfmax=10000N, Pfmin=100N, in advance Crack length processed reaches 12mm, and makes to be placed in blessing tool 1 split place at precrack, and record fatigue life cycle is 30000 times；
() hoop fracture toughness is tested
Starting tensile test protocol, draw speed is 1mm/min, breaks thin-wall pipes on cupping machine, and thin-wall pipes breaks After splitting, record maximum load Pmax=25KN；
After thin-wall pipes fracture, under reading microscope, measure crack length 2ac=12.25mm, be accurate to 0.01mm；
() hoop fracture toughness calculates
Thin-wall pipes hoop fracture toughness Kc, is calculated the hoop fracture toughness i.e. obtaining thin-wall pipes by formula (1),
... ... ... ... ... ... ... ... ... formula (1)；
In formula:
Kc plane stress toughness, unit is MPa m1/2；σ stress, unit is MPa；A crack length, unit is mm；F (a/w) thin-wall pipes geometrical form factors；
Wherein, the width correction factorCalculate by formula (2):
... ... formula (2)；
In formula:
F(ac/ w) thin-wall pipes geometrical form factors；acCritical crack length, unit is mm；W thin-wall pipes width, Unit is mm.
The present invention utilizes annular to accommodate tool can realize prefabricated ring specimen crackle under lossless case, is tried by simple extension Test and realize fracture toughness test, it is to avoid the sample defect brought during bend specimen, can accurately, directly test thin-walled gold Belong to tubing hoop fracture toughness；In the case of using monitoring device, as high-speed motion picture camera etc. can record sample cracks can spread feelings Condition, this device can also coordinate the strain curve of deformeter recordable sample stress.

Claims (5)

1. the device testing thin-wall pipes hoop fracture toughness, it is characterised in that: include disc accommodate tool (1), two Connect tool (2) and by steady pin (3) fixing with being connected tool (2) for blessing tool (1)；The described tool (1) that accommodates is divided into two greatly Little equal halfround bar slice, every halfround bar slice has been respectively formed on fixing hole (4)；The described tool (2) that connects is by connection handle (5) and " ㄇ " type Union joint (6) forms；The center of connection handle (5) and union joint (6) crossbeam is fixed；The two side of union joint (6) is respectively formed on Pin-and-hole (7).
A kind of device testing thin-wall pipes hoop fracture toughness the most according to claim 1, it is characterised in that: described pin The axis in hole (7) is vertical with the axis of connection handle (5).
A kind of device testing thin-wall pipes hoop fracture toughness the most according to claim 1, it is characterised in that add described in: Hold in the gap that tool (1) is placed in two " ㄇ " type union joints (6).
A kind of device testing thin-wall pipes hoop fracture toughness the most according to claim 1, it is characterised in that: described pin Hole (7) center of circle is more than the fixing hole (4) minimum range to its halfround bar slice edge, place to the vertical dimension of union joint (6) crossbeam.
5. the thin-wall pipes hoop fracture of the application a kind of device testing thin-wall pipes hoop fracture toughness described in claim 1 The method of testing of toughness, it is characterised in that: comprise the following steps:
The measurement of () thin-wall pipes size
Measure the width a of thin-wall pipes with digital display calliper, be accurate to 0.02mm；The thickness b of thin-wall pipes is measured, essence with micrometer Really to 0.005mm；
The installation of () device
Thin-wall pipes is placed on disc and accommodates tool (1) outside, between thin-wall pipes and blessing tool (1), smears grease；Will be solid Rationed marketing (3) sequentially passes through the pin-and-hole (7) on union joint (6) sidewall and the fixing hole (4) accommodated on tool (1), and then connection is had (2) it is connected by steady pin (3) is fixing with accommodating to have；Connection handle (5) is installed on fatigue machine, makes thin-wall pipes active section Center be placed in the position parallel with loading direction；
() precrack
Precrack on fatigue machine, tired frequency is less than 100Hz, load ratio Pfmax/Pfmin=10, precrack length control System is between 0.3W ~ 0.35W, and makes to be placed in blessing tool (1) split place at precrack, records fatigue life cycle N；
() hoop fracture toughness is tested
Breaking thin-wall pipes on cupping machine, draw speed is not more than 1mm/min, after thin-wall pipes fracture, and record maximum Load p max；After thin-wall pipes fracture, under reading microscope, measure crack length 2ac, be accurate to 0.01mm；
() hoop fracture toughness calculates
Thin-wall pipes hoop fracture toughness Kc, is calculated the hoop fracture toughness i.e. obtaining thin-wall pipes by formula (1),
... ... ... ... ... ... ... ... ... formula (1)；
In formula:
Kc plane stress toughness, unit is MPa m1/2；σ stress, unit is MPa；A crack length, unit is mm；F (a/w) thin-wall pipes geometrical form factors；
Wherein, the width correction factorCalculate by formula (2):
... ... formula (2)；
In formula:
F(ac/ w) thin-wall pipes geometrical form factors；acCritical crack length, unit is mm；W thin-wall pipes width, single Position is mm.
CN201610572870.5A 2016-07-15 2016-07-15 Device and test method for testing circumferential fracture toughness of thin-wall pipe Pending CN106053232A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108760476A (en) * 2018-05-29 2018-11-06 中国石油天然气集团有限公司 A kind of creep of composite materials performance testing fixture and test method
CN109000906A (en) * 2018-06-01 2018-12-14 芜湖贝埃斯汽车部件有限公司 A kind of detection ABS gear ring tension failure test tool
CN109163973A (en) * 2018-09-30 2019-01-08 上海交通大学 A kind of thin-wall tube sample loading device
CN109238956A (en) * 2017-07-10 2019-01-18 郑州大学 Tear test method in thin wall flexible material face
CN109540658A (en) * 2018-12-18 2019-03-29 中核北方核燃料元件有限公司 A kind of composite material of silicon carbide pipe ring is to stretching tool
CN109579720A (en) * 2018-12-07 2019-04-05 广州大学 A kind of extensometer dynamic measurement method of Edge Distance measurement
CN109632508A (en) * 2019-01-08 2019-04-16 安徽理工大学 A kind of test method of precise measurement Rock Under Uniaxial Compression tensile strength
CN109813609A (en) * 2019-03-26 2019-05-28 四川大学 Plastics Slow Crack on-Line Monitor Device and method
CN114720277A (en) * 2022-03-29 2022-07-08 浙江工业大学 Ring tensile test platform

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1041823A (en) * 1989-11-20 1990-05-02 机械电子工业部北京机电研究所 The prefabricating fatigue crack on fragile materials method and apparatus
CN1865906A (en) * 2006-06-14 2006-11-22 哈尔滨工业大学 Pipe hoop stress tensility testing method
US7140259B2 (en) * 2004-09-28 2006-11-28 U. T. Battelle, Llc Expanded plug method for developing circumferential mechanical properties of tubular materials
CN102445384A (en) * 2011-09-22 2012-05-09 西北工业大学 Clamp for testing annular tensile property of tubular product
CN202693413U (en) * 2012-07-06 2013-01-23 中国核动力研究设计院 Small-sized tube toroidal stretching fixture
CN103698212A (en) * 2013-12-24 2014-04-02 哈尔滨工业大学 Method for directly measuring circumferential normal anisotropy coefficient of pipe
CN105181446A (en) * 2015-08-27 2015-12-23 浙江鑫宙竹基复合材料科技有限公司 Method for detecting initial circumferential tensile strength of bamboo composite pressure pipe
CN205879688U (en) * 2016-07-15 2017-01-11 核工业理化工程研究院 Test thin -walled pipe hoop fracture toughness's device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1041823A (en) * 1989-11-20 1990-05-02 机械电子工业部北京机电研究所 The prefabricating fatigue crack on fragile materials method and apparatus
US7140259B2 (en) * 2004-09-28 2006-11-28 U. T. Battelle, Llc Expanded plug method for developing circumferential mechanical properties of tubular materials
CN1865906A (en) * 2006-06-14 2006-11-22 哈尔滨工业大学 Pipe hoop stress tensility testing method
CN102445384A (en) * 2011-09-22 2012-05-09 西北工业大学 Clamp for testing annular tensile property of tubular product
CN202693413U (en) * 2012-07-06 2013-01-23 中国核动力研究设计院 Small-sized tube toroidal stretching fixture
CN103698212A (en) * 2013-12-24 2014-04-02 哈尔滨工业大学 Method for directly measuring circumferential normal anisotropy coefficient of pipe
CN105181446A (en) * 2015-08-27 2015-12-23 浙江鑫宙竹基复合材料科技有限公司 Method for detecting initial circumferential tensile strength of bamboo composite pressure pipe
CN205879688U (en) * 2016-07-15 2017-01-11 核工业理化工程研究院 Test thin -walled pipe hoop fracture toughness's device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
何肇基: "《高等学校教学用书 金属力学性能试验》", 31 May 1988, 冶金工业出版社 *
卿光辉: "《飞机结构疲劳与断裂》", 31 July 2015, 中国民航出版社 *
徐克玷: "《钼的材料科学与工程》", 31 July 2014, 冶金工业出版社 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109238956B (en) * 2017-07-10 2024-01-30 郑州大学 Thin-wall flexible material in-plane tearing test method
CN109238956A (en) * 2017-07-10 2019-01-18 郑州大学 Tear test method in thin wall flexible material face
CN108760476A (en) * 2018-05-29 2018-11-06 中国石油天然气集团有限公司 A kind of creep of composite materials performance testing fixture and test method
CN108760476B (en) * 2018-05-29 2022-03-29 中国石油天然气集团有限公司 Composite material creep behavior test fixture and test method
CN109000906A (en) * 2018-06-01 2018-12-14 芜湖贝埃斯汽车部件有限公司 A kind of detection ABS gear ring tension failure test tool
CN109163973B (en) * 2018-09-30 2021-10-26 上海交通大学 Thin-walled tube sample loading device
CN109163973A (en) * 2018-09-30 2019-01-08 上海交通大学 A kind of thin-wall tube sample loading device
CN109579720B (en) * 2018-12-07 2021-09-24 广州大学 Extensometer dynamic measurement method for measuring edge distance
CN109579720A (en) * 2018-12-07 2019-04-05 广州大学 A kind of extensometer dynamic measurement method of Edge Distance measurement
CN109540658A (en) * 2018-12-18 2019-03-29 中核北方核燃料元件有限公司 A kind of composite material of silicon carbide pipe ring is to stretching tool
CN109632508A (en) * 2019-01-08 2019-04-16 安徽理工大学 A kind of test method of precise measurement Rock Under Uniaxial Compression tensile strength
CN109813609A (en) * 2019-03-26 2019-05-28 四川大学 Plastics Slow Crack on-Line Monitor Device and method
CN114720277A (en) * 2022-03-29 2022-07-08 浙江工业大学 Ring tensile test platform

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Application publication date: 20161026