CN111122308A - Tensile sample elongation after fracture measuring method and auxiliary measuring device - Google Patents

Tensile sample elongation after fracture measuring method and auxiliary measuring device Download PDF

Info

Publication number
CN111122308A
CN111122308A CN201911311462.4A CN201911311462A CN111122308A CN 111122308 A CN111122308 A CN 111122308A CN 201911311462 A CN201911311462 A CN 201911311462A CN 111122308 A CN111122308 A CN 111122308A
Authority
CN
China
Prior art keywords
fracture
scale
measuring
elongation
sample
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.)
Granted
Application number
CN201911311462.4A
Other languages
Chinese (zh)
Other versions
CN111122308B (en
Inventor
梁明华
贾君君
何小东
蔺卫平
李娜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Petroleum Corp
CNPC Tubular Goods Research Institute
Original Assignee
China National Petroleum Corp
CNPC Tubular Goods Research Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China National Petroleum Corp, CNPC Tubular Goods Research Institute filed Critical China National Petroleum Corp
Priority to CN201911311462.4A priority Critical patent/CN111122308B/en
Publication of CN111122308A publication Critical patent/CN111122308A/en
Application granted granted Critical
Publication of CN111122308B publication Critical patent/CN111122308B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
    • 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
    • G01N3/02—Details
    • G01N3/04—Chucks
    • 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

Abstract

The invention discloses a method for measuring elongation after fracture of a tensile sample and an auxiliary measuring device, wherein the method comprises the following steps that a base, a scale, a first sliding measuring block, a second sliding measuring block and the scale are arranged on the base, and the first sliding measuring block and the second sliding measuring block are in sliding connection with the scale; the measuring method comprises the steps of determining the original gauge length of a sample, moving a first sliding measuring block and a second sliding measuring block to a zero scale mark of a scale, and confirming a zero position; then, the sample is arranged on the base, the fracture position of the sample is enabled to be coincident with the zero scale mark of the scale, the first measuring block is slid to be arranged at the left scale distance, the second measuring block is slid to be arranged at the right scale distance, and the broken scale distance and the distance between the fracture position in the scale distance and the nearest edge scale distance are read; then calculating the elongation after fracture according to the gauge length after fracture; the method can accurately obtain the elongation after fracture of all samples within the original gauge length range of the fracture, has high accuracy, and can effectively solve the problem that the traditional measurement method is inaccurate in measurement or the samples are scrapped when the fracture deviates.

Description

Tensile sample elongation after fracture measuring method and auxiliary measuring device
Technical Field
The invention belongs to the technical field of material tensile property testing, and particularly relates to a method and an auxiliary measuring device for measuring elongation after fracture of a tensile sample.
Background
The elongation after fracture is one of the most basic mechanical property indexes of the steel material and is used for reflecting the capability of irreversible permanent deformation before the steel material is fractured. In the test of the elongation after fracture of the steel bar-shaped tensile sample, the original gauge length L of the sample needs to be determined before the experiment0And measuring the gauge length Lu after fracture. By formula A ═ Lu-L0)/L0X 100% the elongation after break of the sample was calculated. In actual practice, the position of the specimen at break affects the results of the elongation after break. In the No. 1 part of the metal material tensile test of the national standard GB/T228.1-2010: in the room temperature test method, appendix H provides a displacement method for measuring the elongation after fracture, so that the situation that the sample is scrapped because the fracture position of the sample does not meet the conditions specified by the standard is avoided, but the measurement operation of the displacement method is more complicated and the efficiency is low.
Disclosure of Invention
In order to solve the problems in the prior art, the invention discloses a method and an auxiliary measuring device for measuring the elongation after fracture of a tensile sample, which are used for assisting in measuring the elongation after fracture of the tensile sample and improving the accuracy and efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that the auxiliary measuring device for measuring the elongation after the tensile sample is broken comprises a base, a scale, a first sliding measuring block, a second sliding measuring block and the scale, wherein the scale is arranged on the base, the first sliding measuring block and the second sliding measuring block are in sliding connection with the scale, and a sample groove is formed in the base.
The base has magnetism.
The section of the sample groove is V-shaped, the opening angle of the sample groove is 120 degrees, and an axial clamping block is arranged on the sample groove.
The first sliding measurement block and the second sliding measurement block adopt digital display vernier on a digital display vernier caliper.
The base is provided with a controller and a display, the output end of the controller is connected with the display, and the digital display vernier is connected with the input end of the controller.
The method for measuring the elongation after fracture of the tensile sample based on the auxiliary measuring device comprises the following steps:
step 1, selecting a standard and determining an original scale distance L of a sample0；
Step 2, moving the first sliding measuring block and the second sliding measuring block to a zero scale mark of the scale, and performing zero position confirmation;
step 3, mounting the sample on the base, enabling the fracture position of the sample to coincide with the zero scale mark of the scale, sliding the first measuring block to be arranged at the left scale distance, sliding the second measuring block to be arranged at the right scale distance, and reading the distance L between the fracture position after fracture and the scale distance L between the fracture position in the scale distance and the nearest edge scale distancem；
Step 4, calculating the elongation after fracture according to the gauge length after fracture:
Figure BDA0002324636750000021
Y＝Lm/Lu(2)
AT＝(Lu-L0)/L0×100％ (3)
wherein: a: final elongation after fracture; a. theT: measuring the elongation after fracture in the test; x: a material coefficient; y: the rate of fracture deviation.
In step 1, the steel metal material x is taken as-0.56.
In step 1, GB/T228.1 or ASTM A370 is the standard of choice.
In the step 1, the sample is a rectangular cross section sample, a circular tube section sample or a circular tube longitudinal arc sample.
Compared with the prior art, the invention has at least the following beneficial effects: the auxiliary device can measure the length of the sample after tensile fracture, the sample is arranged on the base, and the first sliding measuring block and the second sliding measuring block are moved to read the numerical value, so that the elongation after fracture of the sample can be calculated.
The method is suitable for measuring the elongation after fracture of various samples under different standards, can accurately obtain the elongation after fracture of all samples within the original gauge length range based on the method, has high accuracy, and can effectively solve the problem that the traditional measuring method is inaccurate in measurement or the samples are scrapped when the fracture deviates.
Drawings
FIG. 1 shows an auxiliary measuring device for elongation after fracture of a tensile test specimen;
figure 2 is a schematic representation of an alternative embodiment of the present invention.
In the drawings, 1: base, 2: scale, 3: first slide measurement block, 4: second slide measurement block, 5: sample tank, 6: a display; 7: and (4) sampling.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
An auxiliary measuring device for measuring elongation after fracture of a tensile sample comprises a base 1, a scale 2, a first sliding measuring block 3, a second sliding measuring block 4 and the scale 2, wherein the scale 2 is arranged on the base 1, and the first sliding measuring block 3 and the second sliding measuring block 4 are connected with the scale 2 in a sliding manner; the base 1 has magnetism; the base 1 is provided with a sample groove 5, the section of the sample groove 5 is V-shaped, and the opening angle of the sample groove 5 is 120 degrees.
The first sliding measuring block 3 and the second sliding measuring block 4 adopt digital display vernier on a digital display vernier caliper.
The base 1 is provided with a controller and a display 6, the output end of the controller is connected with the display 6, and the digital display vernier is connected with the input end of the controller.
The method for measuring the elongation after fracture of the tensile sample based on the auxiliary measuring device comprises the following steps:
step 1, selecting standard and determining original scale distance L of sample 70；
Step 2, moving the first sliding measuring block 3 and the second sliding measuring block 4 to a zero scale line of the scale 2, and performing zero position confirmation;
step 3, mounting the sample 7 on the base 1, enabling the fracture position of the sample 7 to coincide with the zero scale mark of the scale 2, sliding the first measuring block 3 to be placed at the left scale distance, sliding the second measuring block 4 to be placed at the right scale distance, and reading the distance L between the fracture position in the fracture position and the nearest edge scale distance in the scale distancem；
Step 4, calculating the elongation after fracture according to the gauge length after fracture:
Figure BDA0002324636750000041
Y＝Lm/Lu(2)
AT＝(Lu-L0)/L0×100％ (3)
auxiliary measuring device for elongation after fracture
As shown in fig. 1, an auxiliary measuring device for measuring elongation after fracture of a tensile sample comprises a base 1, a scale 2, a first sliding measuring block 3, a second sliding measuring block 4 and the scale 2, wherein the scale 2 is arranged on the base 1, the first sliding measuring block 3 and the second sliding measuring block 4 are connected with the scale 2 in a sliding manner, and a sample groove is formed in the base 1; the base 1 has magnetic properties.
The section of the sample groove is V-shaped, the opening angle of the sample groove is 120 degrees, and an axial clamping block is arranged on the sample groove; the sample groove is provided with an axial clamping block, the side face of the axial clamping block is provided with a connecting spring, and when a sample is placed in the sample groove, the axial clamping block clamps the sample from two ends under the action of the tensile force of the spring.
As shown in fig. 2, the first sliding measurement block 3 and the second sliding measurement block 4 adopt a digital vernier on a digital vernier caliper; the base 1 is provided with a controller and a display, the output end of the controller is connected with the display 6, and the digital display vernier is connected with the input end of the controller.
The output ends of the first sliding measuring block 3 and the second sliding measuring block 4 are both connected with the input end of a controller 9, and the output end of the controller 9 is connected with a display panel 8; the controller 9 calculates the post-fracture elongation and then displays the result on the display panel 8.
The base 1 has magnetism, can adsorb steel metal sample, and the location of the sample of being convenient for is provided with the sample groove of placing sample 11 on the base 1, and the section in sample groove is the V-arrangement, and its opening angle is 120, can restrict the sample and roll.
The method for measuring the elongation after fracture of the tensile sample by adopting the auxiliary measuring device comprises the following steps:
step 1, selecting standard and determining original scale distance L of sample 70；
Step 2, moving the first sliding measuring block 3 and the second sliding measuring block 4 to a zero scale line of the scale 2, and performing zero position confirmation;
step 3, mounting the sample 7 on the base 1, enabling the fracture position of the sample 7 to coincide with the zero scale mark of the scale 2, sliding the first measuring block 3 to be placed at the left scale distance, sliding the second measuring block 4 to be placed at the right scale distance, and reading the distance L between the fracture position in the fracture position and the nearest edge scale distance in the scale distancem；
And 4, calculating the elongation after fracture according to the gauge length after fracture.
The scale distance obtained by the calculation method and the auxiliary measuring device of the invention and the scale distance pair ratio measured according to the standard are shown in table 1, and the method can obtain accurate results:
Figure BDA0002324636750000051
as an alternative embodiment of the method according to the invention,
step 1, determining the original gauge length of the selected standard and the sample.
Step 1, selecting standard and determining original scale distance L of sample 70；
Step 2, moving the first sliding measuring block 3 and the second sliding measuring block 4 to a zero scale line of the scale 2, and performing zero position confirmation;
step 3, mounting the sample 7 on the base 1, enabling the fracture position of the sample 7 to coincide with the zero scale mark of the scale 2, sliding the first measuring block 3 to be placed at the left scale distance, sliding the second measuring block 4 to be placed at the right scale distance, and reading the distance L between the fracture position after fracture and the scale distance inner fracture position and the scale distance L between the fracture position and the nearest edge scale distance from the display screenm；
And 4, calculating the elongation after fracture in the controller, and displaying the elongation after fracture of the test sample 7 on a display screen by the controller.

Claims (9)

1. The utility model provides a tensile sample elongation after breakage measuring auxiliary measuring device, its characterized in that, includes that base (1), scale (2), first slip measuring block (3), second slip measuring block (4), scale (2) set up on base (1), first slip measuring block (3) and second slip measuring block (4) and scale (2) sliding connection are provided with sample groove (5) on base (1).
2. Auxiliary measuring device for the measurement of elongation after fracture of a tensile specimen according to claim 1, characterized in that the base (1) is magnetic.
3. The auxiliary measuring device for the elongation after fracture of the tensile specimen as claimed in claim 1, wherein the section of the specimen groove (5) is V-shaped, the opening angle is 120 degrees, and the specimen groove (5) is provided with an axial clamping block.
4. The auxiliary measuring device for measuring the elongation after fracture of the tensile sample according to claim 1, wherein the first sliding measuring block (3) and the second sliding measuring block (4) adopt a digital vernier on a digital vernier caliper.
5. The auxiliary measuring device for measuring the elongation percentage after fracture of the tensile sample according to claim 1, wherein the base (1) is provided with a controller and a display (6), the output end of the controller is connected with the display (6), and the digital display vernier is connected with the input end of the controller.
6. The method for measuring the elongation after fracture of the tensile sample based on the auxiliary measuring device of claim 1 is characterized by comprising the following steps:
step 1, selecting a standard and determining an original scale distance L of a sample (7)0；
Step 2, moving the first sliding measuring block (3) and the second sliding measuring block (4) to a zero scale line of the scale (2) to perform zero position confirmation;
step 3, mounting the sample (7) on the base (1), enabling the fracture position of the sample (7) to coincide with the zero scale mark of the scale (2), sliding the first measuring block (3) to be placed at the left scale distance, sliding the second measuring block (4) to be placed at the right scale distance, and reading the distance L between the fracture position after fracture and the scale distance and the distance L between the fracture position in the scale distance and the nearest edge scale distancem；
Step 4, calculating the elongation after fracture according to the gauge length after fracture:
Figure FDA0002324636740000021
Y＝Lm/Lu(2)
AT＝(Lu-L0)/L0×100％ (3)
wherein: a: final elongation after fracture; a. theT: measuring the elongation after fracture in the test; x: a material coefficient; y: the rate of fracture deviation.
7. The method for measuring elongation after fracture of a tensile specimen according to claim 6, wherein in the step 1, the ferrous metal material x is-0.56.
8. The method for measuring elongation after break of a tensile specimen according to claim 6, wherein in step 1, the standard selected is GB/T228.1 or ASTM A370.
9. The method for measuring elongation after fracture of a tensile specimen according to claim 6, wherein in the step 1, the specimen is a rectangular cross-section specimen, a circular cross-section specimen, a round tube segment specimen or a round tube longitudinal arc specimen.
CN201911311462.4A 2019-12-18 2019-12-18 Tensile sample elongation after fracture measuring method and auxiliary measuring device Active CN111122308B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911311462.4A CN111122308B (en) 2019-12-18 2019-12-18 Tensile sample elongation after fracture measuring method and auxiliary measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911311462.4A CN111122308B (en) 2019-12-18 2019-12-18 Tensile sample elongation after fracture measuring method and auxiliary measuring device

Publications (2)

Publication Number Publication Date
CN111122308A true CN111122308A (en) 2020-05-08
CN111122308B CN111122308B (en) 2022-06-03

Family

ID=70499791

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911311462.4A Active CN111122308B (en) 2019-12-18 2019-12-18 Tensile sample elongation after fracture measuring method and auxiliary measuring device

Country Status (1)

Country Link
CN (1) CN111122308B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112730062A (en) * 2020-12-23 2021-04-30 哈电集团（秦皇岛）重型装备有限公司 Auxiliary measurement device and method for elongation after fracture and reduction of area in tensile test
CN114166131A (en) * 2021-12-08 2022-03-11 郑州天宏工程检测有限公司 System for detecting elongation after fracture of steel bar and using method thereof
CN114739256A (en) * 2022-04-20 2022-07-12 中北大学 Scribing and measuring method for cylindrical sample tensile experiment
CN114812340A (en) * 2022-04-20 2022-07-29 中北大学 Scribing and measuring device for cylindrical sample tensile experiment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012098267A (en) * 2010-10-06 2012-05-24 Nec Corp Elongation measurement system and method
CN203286949U (en) * 2013-05-13 2013-11-13 中国石油天然气集团公司 Auxiliary measurement tool
CN203414340U (en) * 2013-08-25 2014-01-29 中国北车集团大同电力机车有限责任公司 Auxiliary tool for measuring gauge length of fractured tensile sample
JP2015175606A (en) * 2014-03-13 2015-10-05 株式会社島津製作所 Marked line stamp device and material testing machine
CN205826383U (en) * 2016-07-28 2016-12-21 山东核电设备制造有限公司 A kind of tensile test piece gauge length device for dotting
CN206095779U (en) * 2016-09-09 2017-04-12 上海海隆石油管材研究所 Tensile sample anchor clamps for parameter measurement of having no progeny
CN208060287U (en) * 2018-04-18 2018-11-06 健研检测集团有限公司 A kind of reinforcing steel bar break elongation rate detector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012098267A (en) * 2010-10-06 2012-05-24 Nec Corp Elongation measurement system and method
CN203286949U (en) * 2013-05-13 2013-11-13 中国石油天然气集团公司 Auxiliary measurement tool
CN203414340U (en) * 2013-08-25 2014-01-29 中国北车集团大同电力机车有限责任公司 Auxiliary tool for measuring gauge length of fractured tensile sample
JP2015175606A (en) * 2014-03-13 2015-10-05 株式会社島津製作所 Marked line stamp device and material testing machine
CN205826383U (en) * 2016-07-28 2016-12-21 山东核电设备制造有限公司 A kind of tensile test piece gauge length device for dotting
CN206095779U (en) * 2016-09-09 2017-04-12 上海海隆石油管材研究所 Tensile sample anchor clamps for parameter measurement of having no progeny
CN208060287U (en) * 2018-04-18 2018-11-06 健研检测集团有限公司 A kind of reinforcing steel bar break elongation rate detector

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
刘利群: "铝板带断后伸长率与断裂总伸长率差异验证", 《云南冶金》 *
朱健康: "测定断后伸长率的新方法——解析法", 《理化检验-物理分册》 *
王磊: "移位法在测定断后伸长率中的应用", 《机车车辆工艺》 *
许晓锋: "高强度管线钢拉伸试验伸长率变化规律研究和分析", 《石油管材与仪器》 *
骆书明: "不锈钢棒1Cr17Ni3A断后伸长率的换算及验证", 《中国检验检测》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112730062A (en) * 2020-12-23 2021-04-30 哈电集团（秦皇岛）重型装备有限公司 Auxiliary measurement device and method for elongation after fracture and reduction of area in tensile test
CN114166131A (en) * 2021-12-08 2022-03-11 郑州天宏工程检测有限公司 System for detecting elongation after fracture of steel bar and using method thereof
CN114739256A (en) * 2022-04-20 2022-07-12 中北大学 Scribing and measuring method for cylindrical sample tensile experiment
CN114812340A (en) * 2022-04-20 2022-07-29 中北大学 Scribing and measuring device for cylindrical sample tensile experiment
CN114739256B (en) * 2022-04-20 2023-07-21 中北大学 Scribing and measuring method for cylindrical sample tensile experiment
CN114812340B (en) * 2022-04-20 2023-12-26 中北大学 Scribing and measuring device for cylindrical sample stretching experiment

Also Published As

Publication number Publication date
CN111122308B (en) 2022-06-03

Similar Documents

Publication Publication Date Title
CN111122308B (en) Tensile sample elongation after fracture measuring method and auxiliary measuring device
CN201225884Y (en) Apparatus for measuring gauge length
CN108458930A (en) The method for determining material creep parameter with clamped straight-bar small sample creep test
CN109870355B (en) Automatic measurement method for elongation after uniaxial tension fracture of metal plate sample
CN103017642A (en) Displacement meter calibrating apparatus
CN101699259A (en) Method for simulating bent pipe deformation by bending
CN210718879U (en) Portable engineering detection ruler
CN109870354B (en) Automatic measurement method for elongation after uniaxial tension fracture of metal round bar sample
CN207850820U (en) A kind of device for measuring fracture toughness specimen crack length
CN2807194Y (en) Continuous metal pipe wall thickness measurer
CN108981643A (en) A kind of cable conductor or the quick accurate measurement method of insulating layer sectional area
CN211824199U (en) Detection apparatus for foraminiferous work piece internal diameter
CN211528030U (en) Glass sample stress application force measuring device for stress photoelastic coefficient test
CN105928784B (en) The method for measuring fracture toughness under hot rolling carbon steel plane stress condition
CN211576232U (en) Standard device of grating type indicating meter calibrating instrument
CN211060819U (en) Double-meter extensometer for reinforcing steel bar
CN206891361U (en) A kind of cylinder linearity testing apparatus
CN110579409A (en) Test instrument and test method for three-point bending strength test
CN109253902B (en) Device and method for measuring and marking scale distance of tensile sample
CN219531843U (en) Simple aluminum alloy profile elongation gauge length and measuring scale
CN110608655A (en) Special tool for measuring bending degree of power transmission line crimping pipe
CN216482732U (en) Lateral bending measuring device for strip
CN200968852Y (en) Deepness tester for digital display pipeline pits
CN219433993U (en) Gap measuring ruler
CN111122317A (en) Calibration method for r value test of metal material

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant