CN205719814U - Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit - Google Patents
Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit Download PDFInfo
- Publication number
- CN205719814U CN205719814U CN201620611907.6U CN201620611907U CN205719814U CN 205719814 U CN205719814 U CN 205719814U CN 201620611907 U CN201620611907 U CN 201620611907U CN 205719814 U CN205719814 U CN 205719814U
- Authority
- CN
- China
- Prior art keywords
- edge
- knife
- points bending
- bending specimen
- fracture toughness
- 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.)
- Expired - Fee Related
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
nullThree Points Bending Specimen ductile fracture toughness JIC auxiliary test unit，It is provided with two groups and two COD are advised edge of a knife sword group (8) clamped respectively，Two edges of a knife sword group (8) are arranged in differing heights，Two edge of a knife swords of lower edge of a knife sword group (3) are symmetrically arranged at the both sides of Three Points Bending Specimen breach (4)，And be opened on Three Points Bending Specimen (5)，Two edge of a knife swords of upper edge of a knife sword group (2) are separately positioned on the edge of a knife auxiliary device (1) of two symmetrically arranged Three Points Bending Specimen breach both sides，The snap arm (101) of the both sides of edge of a knife auxiliary device (1) is folded on Three Points Bending Specimen (5) by bolt (102) respectively，Before testing，Two edge of a knife swords of upper edge of a knife sword group (2) and two edge of a knife swords of lower edge of a knife sword group (3) align in the horizontal direction，Two edge of a knife sword in the vertical direction alignment of two edges of a knife sword group (8) in the same side.The safety evaluation work that the method makes high-strength and high ductility close can effectively be carried out.
Description
Technical field
This utility model belongs to Fracture of Metal Material mechanics properties testing technical field, is specifically related to a kind of three-point bending examination
Sample ductile fracture toughnessJ ICTest device.
Background technology
Along with the raising of metallurgical quality, high-strength and high ductility alloy is as getting more and more that structural material is applied in engineering, warp
Often need it is carried out safety evaluation.Plane strain fracture toughnessK ІCIt is important safety evaluation index and structure member design refers to
Mark, therefore obtains the plane strain fracture toughness of high-strength and high ductility alloy by testK ІCJust it is particularly important.But for height
Strong high-ductility alloy, directly tests plane strain fracture toughnessK ІCThe most infeasible, this is due in testing according to relatively
Undersized fracture toughness specimen, is generally unsatisfactory for plane strainK ІCDecision conditionB≥2.5(K ІC/R p0.2)2WithP max/P Q≤
1.1；In testing according to the fracture toughness specimen of large-size, the capacity of testing machine is typically not capable of.At present for high-strength
High-ductility alloy plane strain fracture toughnessK ІCTest be by test ductile fracture toughnessJ IC, conversion formula obtainK ІC.Three
Point bend specimen becomes Fracture of Metal Material mechanics properties testing neck due to advantages such as form are simple, processing is quick, representativeness is strong
In territory, the breach of the first-selection of sample form, especially Three Points Bending Specimen is positioned at upper surface so that COD rule can be placed in cryogenic liquid
Outward, such that it is able to be effectively protected COD rule, this makes Three Points Bending Specimen become low temperature ductility fracture toughnessJ ICSample in test
The unique selection of form.In ductile fracture toughnessJ ICIn process of the test, need to obtain point of application displacementV-loadFCurve, and right
In Three Points Bending Specimen, owing to COD rule can only record the notch opening displacement of horizontal direction, it is impossible to directly obtain vertical direction
Point of application displacement, as it is shown in figure 1, test can not obtain effective ductile fracture toughness thenJ IC.At present, most of testers are
Be directly utilize testing machine rack position shift near like replace point of application displacement, due to testing machine frame displacement include point of application displacement,
Equipment displacement, crosshead displacement, sample elasticity displacement and test fixture elastic displacement, this results in the testing machine frame that test obtains
Displacement is far longer than point of application displacement, thus causes test error.
Utility model content
In order to solve ductile fracture toughnessJ ICThe problem that in test, the displacement of the Three Points Bending Specimen point of application cannot be tested, this reality
A kind of Three Points Bending Specimen ductile fracture toughness is provided with novelJ ICTest device.This device obtains by edge of a knife auxiliary device
The COD of differing heights advises opening displacement, is calculated the point of application displacement of Three Points Bending Specimen, and then obtains Three Points Bending Specimen
Ductile fracture toughnessJ ICSo that the safety evaluation work that high-strength and high ductility closes can effectively be carried out.
For realizing above-mentioned technical purpose, the technical scheme is that Three Points Bending Specimen ductile fracture toughness JIC assists
Test device, is provided with two groups and two COD advises the edge of a knife sword group clamped respectively, and two edge of a knife sword groups are that differing heights is arranged, under
Two edge of a knife swords of edge of a knife sword group are symmetrically arranged at the both sides of Three Points Bending Specimen breach, and are opened on Three Points Bending Specimen, on
Two edge of a knife swords of edge of a knife sword group are separately positioned on the edge of a knife auxiliary dress of two symmetrically arranged Three Points Bending Specimen breach both sides
Putting, the snap arm of the both sides of edge of a knife auxiliary device is located on Three Points Bending Specimen by bolt clip respectively, before testing, and the upper edge of a knife
Two edge of a knife swords of sword group and two edge of a knife swords of lower edge of a knife sword group align, in the horizontal direction at two edge of a knife swords of the same side
Two edge of a knife sword in the vertical direction alignment of group.
It is provided with pad between bolt described in the utility model and Three Points Bending Specimen.
The bolt head of bolt described in the utility model is cambered surface, and the center of pad is provided with match with bolt head recessed
Groove.
The method of testing of Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit, comprises the following steps:
Step one, two edge of a knife auxiliary device are respectively symmetrically the both sides being arranged on Three Points Bending Specimen breach, at 3 points
Symmetrical edge of a knife sword group, the cutter of two edge of a knife auxiliary device compositions are offered in the both sides of the Three Points Bending Specimen breach of bend specimen
Mouth sword group is higher than the edge of a knife sword group of Three Points Bending Specimen, two edge of a knife swords of upper edge of a knife sword group and two edges of a knife of lower edge of a knife sword group
Sword aligns in the horizontal direction, two edge of a knife sword in the vertical direction alignment of two edge of a knife sword groups in the same side, two cuttves
Mouth sword group clamps COD rule respectively；
Step 2, three point bending test machine is utilized to advise Three Points Bending Specimen imposed load, two COD to two edge of a knife swords
Group applies tension force, makes edge of a knife auxiliary device not slide relative to Three Points Bending Specimen, the opening displacement of edge of a knife sword group in testV 1Opening displacement with lower edge of a knife sword groupV 2, by formula(2)
In formula:
qThe displacement of-the point of application；
S-Three Points Bending Specimen span；
V 1 -The opening displacement of two edge of a knife swords of upper edge of a knife sword group；
V 2The opening displacement of two edge of a knife swords of-lower edge of a knife sword group；
z 1-distance between the lower edge of a knife and Three Points Bending Specimen surface；
z 2-upper distance between the edge of a knife and Three Points Bending Specimen surface；
The point of application displacement of Three Points Bending Specimen can be obtainedq, use many SAMPLE METHOD to obtain the Δ of Three Points Bending Specimena-J
Resistance curve, ductile fracture toughnessJ ICAnd plane strain fracture toughnessK IC。
This utility model provides the benefit that:
The method, by edge of a knife auxiliary device, is advised opening displacement by the COD of test differing heights, is utilized geometrical principle meter
Calculate the point of application displacement obtaining Three Points Bending Specimen, then obtain the ductile fracture toughness of sampleJ IC, the data accuracy that obtains
Height, error are low.This makes the safety evaluation work of high-strength and high ductility alloy effectively to carry out.This device has dismounting side simultaneously
Just, the advantage such as can reuse.
Accompanying drawing explanation
Fig. 1 is that in prior art, COD rule survey notch opening displacement schematic diagram；
Fig. 2 is this utility model point of application displacement measurement schematic diagram；
Fig. 3 is this utility model edge of a knife auxiliary device fitting plane schematic diagram；
Fig. 4 is the side-looking structural representation of this utility model edge of a knife auxiliary device；
Fig. 5 is that this utility model edge of a knife auxiliary device assembles schematic perspective view；
Fig. 6 is the perspective view of this utility model edge of a knife auxiliary device；
Fig. 7 is this utility model embodiment X70 pipe line steel fracture toughnessJ ICSample faces form and size；
Fig. 8 is this utility model embodiment X70 pipe line steel fracture toughnessJ ICSample overlooks form and size；
Fig. 9 is that this utility model 1# sample COD advises opening displacementV 1/V 2-loadFCurve；
Figure 10 is this utility model 1# sample point of application displacementq-loadFCurve；
Figure 11 is this utility model X70 pipe line steelJIntegration and crack extension ΔaGraph of relation；
Figure 12 is the structural representation of this utility model bolt；
Figure 13 is the perspective view of this utility model pad；
In figure: 1, edge of a knife auxiliary device, 101, snap arm, 102, bolt, 1021, bolt head, 2, upper edge of a knife sword group, 3, lower cutter
Mouthful sword group, 4, Three Points Bending Specimen breach, 5, Three Points Bending Specimen, 6, COD rule, 7, pad, 701, groove, 8, edge of a knife sword group.
Detailed description of the invention
Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit, opens position by the COD rule of test differing heights
Moving, utilize geometrical principle to be calculated the point of application displacement of Three Points Bending Specimen, test philosophy is shown in Fig. 2, point of application displacementqCan be by
Formula (2) calculates and obtains.
(1)
(2)
In formula:
qThe displacement of-the point of application；
S-Three Points Bending Specimen span；
V 1,V 2The opening displacement of-two edges of a knife；
z 1,z 2Distance between-two edges of a knife and specimen surface；
The test of point of application displacement realizes by edge of a knife auxiliary device.Edge of a knife auxiliary device includes a pair edge of a knife sword, pad
Sheet and bolt etc..A pair edge of a knife sword is respectively symmetrically and is placed in three-point bendingJ ICThe both sides of sample break, by four pads and four spiral shells
Bolt fixes edge of a knife auxiliary device respectively from front, rear, left and right, and cutter product sword is opened on Three Points Bending Specimen by another, it is ensured that sample
The edge of a knife of breach both sides is on same horizontal line, as shown in Fig. 3,4,5, and advises to two edge of a knife sword groups applyings at COD
Ensure during power that its relative sample does not slides.
There is problems in that 1. three-point bendings when using the point of application displacement of auxiliary device indirectly testing Three Points Bending Specimen
Two edge of a knife sword in the vertical directions of the every side of sample break need alignment, as in figure 2 it is shown, A1 and B1 needs on one wire, and A2
Also needing on one wire with B2, it is correct that such guarantee converts, according to similar triangles, the point of application displacement obtained.2.
The edge of a knife of Three Points Bending Specimen breach both sides needs alignment in the horizontal direction, as in figure 2 it is shown, A1 and A2 need to be at a horizontal line
On, B1 and B2 also need to be on a horizontal line, and the most also guarantee converts the point of application displacement obtained according to similar triangles
It is correct.3., when the edge of a knife is applied to the tension force of breach both sides by COD rule, the edge of a knife can not occur relatively to slide relative to sample,
All data that so guarantee gathers in process of the test, the point of application displacement converted through similar triangles is effective.
To sum up, 1. the edge of a knife auxiliary device in this utility model uses line cutting one-shot forming, it is ensured that two symmetrically arranged edges of a knife are auxiliary
Help two edge of a knife swords of device on one wire；2. two edge of a knife auxiliary device use left and right matched design, and correspondingly-sized is homogeneous
Sample, and bolt location dimension is too, thus can ensure that the blade of breach both sides is on same horizontal line；3. use
Bolt positions, and uses pad bump contact stress, it is ensured that edge of a knife auxiliary device and sample are not between bolt and sample
Occur relatively to slide.
As shown in Fig. 6,12,13, Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit.By the edge of a knife auxiliary
Help device to include the upper edge of a knife sword group for installing COD rule, and for position and install edge of a knife auxiliary device with
The pad of central recess and the bolt with cambered surface bolt head.
As it is shown in figure 5, the erection sequence of edge of a knife auxiliary device is: left edge of a knife auxiliary device and right edge of a knife auxiliary device are divided
It is not arranged on the left and right sides of distance Three Points Bending Specimen breach 5mm, in front left, front right, rear left, four positions of rear right plus band
There is the pad of central recess, and from four positions, bolt is installed simultaneously, bolt head is pressed on pad, installation process ensures
The edge of a knife auxiliary device of the left and right sides keeps level.
Embodiment 1
A kind of Three Points Bending Specimen ductile fracture toughnessJ ICAfter test device utility model success, to the multiple trade mark and difference
Thickness pipe line steel material, has carried out air and the ductile fracture toughness under briny environmentJ ICTest.Below with a pipeline steel
The test of material is as embodiment.
1, test material: X70 pipe line steel
2, condition of heat treatment: quenched
3, test temperature: 23 ~ 25 DEG C of envionmental humidities: 40 ~ 50%
4, specimen types: SE (B) sample, its geomery see Fig. 7,8.
5, pilot project: ductile fracture toughnessJ ICTest
6, test method: edge of a knife auxiliary device is arranged on X70 pipe line steel SE (B) sample, under breach both sides are offered
Edge of a knife sword group, uses the opening displacement of two COD rule two edge of a knife sword groups of testV 1WithV 2, formula (2) sample can be obtained
Point of application displacementq, use many SAMPLE METHOD to obtain the Δ of X70 pipe line steela-JResistance curve, ductile fracture toughnessJ ICAnd plane strain
Fracture toughnessK IC。
7, result of the test:
7.1, point of application displacementq
Owing to each sample obtains point of application displacementqMethod the same, the most only provide 1# sample point of application displacementqTest
Result.The 1# sample COD that testing machine gathers automatically advises opening displacementV 1/V 2-loadFCurve is shown in Fig. 9, processes via formula (1)
The 1# sample point of application displacement arrivedq-loadFCurve is shown in Figure 10.
7.2, test data
By point of application displacementq-loadFCurve can obtain each sample break point loadF sWith plasticity componentU p, by measuring
The thickness of each sample can be obtainedB, widthW, Initial crack lengtha 0With crack extension Δa, calculate can obtain by formula
To each sampleJValue.Test data is shown in Table 1.
Table 1 test data
7.3, X70 pipe line steel Δa-JResistance curve (see Figure 11)
7.4, X70 pipe line steel Δa-JResistance curve equation
J=312.07×Δa 0.5784 (R=0.9893)
7.5, result of the test (see Table 2)
Table 2 result of the test
。
Claims (3)
1. Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit, it is characterised in that: it is provided with two groups to two COD rule
Edge of a knife sword group (8) clamped respectively, two edges of a knife sword group (8) are arranged in differing heights, two edge of a knife swords of lower edge of a knife sword group (3)
It is symmetrically arranged at the both sides of Three Points Bending Specimen breach (4), and is opened on Three Points Bending Specimen (5), the two of upper edge of a knife sword group (2)
Individual edge of a knife sword is separately positioned on the edge of a knife auxiliary device (1) of two symmetrically arranged Three Points Bending Specimen breach both sides, the edge of a knife
The snap arm (101) of the both sides of auxiliary device (1) is folded on Three Points Bending Specimen (5) by bolt (102) respectively, in test
Before, two edge of a knife swords of upper edge of a knife sword group (2) and two edge of a knife swords of lower edge of a knife sword group (3) align in the horizontal direction, same
Two edge of a knife sword in the vertical direction alignment of two edges of a knife sword group (8) of side.
2. Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit as claimed in claim 1, it is characterised in that: institute
It is provided with pad (7) between bolt (102) and the Three Points Bending Specimen (5) stated.
3. Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit as claimed in claim 2, it is characterised in that: institute
The bolt head (1021) of the bolt (102) stated is cambered surface, and the center of pad (7) is provided with the groove matched with bolt head (1021)
(701).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620611907.6U CN205719814U (en) | 2016-06-21 | 2016-06-21 | Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620611907.6U CN205719814U (en) | 2016-06-21 | 2016-06-21 | Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205719814U true CN205719814U (en) | 2016-11-23 |
Family
ID=57316193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620611907.6U Expired - Fee Related CN205719814U (en) | 2016-06-21 | 2016-06-21 | Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205719814U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938072A (en) * | 2016-06-21 | 2016-09-14 | 中国船舶重工集团公司第七二五研究所 | Three-point bending sample ductile fracture toughness (JIC) testing device and test method thereof |
| CN106404553A (en) * | 2016-06-21 | 2017-02-15 | 中国船舶重工集团公司第七二五研究所 | Auxiliary testing apparatus for ductile fracture toughness J<IC> of three-point bending sample and testing method thereof |
| CN113933122A (en) * | 2021-10-11 | 2022-01-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for manufacturing three-dimensional axisymmetric smooth curved internal crack |
-
2016
- 2016-06-21 CN CN201620611907.6U patent/CN205719814U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938072A (en) * | 2016-06-21 | 2016-09-14 | 中国船舶重工集团公司第七二五研究所 | Three-point bending sample ductile fracture toughness (JIC) testing device and test method thereof |
| CN106404553A (en) * | 2016-06-21 | 2017-02-15 | 中国船舶重工集团公司第七二五研究所 | Auxiliary testing apparatus for ductile fracture toughness J<IC> of three-point bending sample and testing method thereof |
| CN105938072B (en) * | 2016-06-21 | 2018-12-25 | 中国船舶重工集团公司第七二五研究所 | A kind of Three Points Bending Specimen ductile fracture toughness JIC test device and test method |
| CN106404553B (en) * | 2016-06-21 | 2023-06-30 | 中国船舶重工集团公司第七二五研究所 | Three-point bending sample ductile fracture toughness JIC auxiliary test device and test method |
| CN113933122A (en) * | 2021-10-11 | 2022-01-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for manufacturing three-dimensional axisymmetric smooth curved internal crack |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205719814U (en) | Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit | |
| Darcis et al. | Crack tip opening angle optical measurement methods in five pipeline steels | |
| CN105938072B (en) | A kind of Three Points Bending Specimen ductile fracture toughness JIC test device and test method | |
| CN102865948A (en) | Method for determining residual butt welding stress of aluminum alloy sheets | |
| CN106404553A (en) | Auxiliary testing apparatus for ductile fracture toughness J<IC> of three-point bending sample and testing method thereof | |
| CN102680331A (en) | Check method for shear strength of welding joint of linear welding seam | |
| CN106018083A (en) | Method for determining plane stress fracture toughness and yield strength of aluminum alloy material by structure yield load | |
| CN108181184A (en) | A kind of evaluating apparatus and application method of sheet metal buckling performance | |
| CN106092785A (en) | The method using asymmetric crackle test fatigue crack growth rate | |
| Park et al. | Fracture toughness measurements using two single-edge notched bend test methods in a single specimen | |
| CN109870354B (en) | Automatic measurement method for elongation after uniaxial tension fracture of metal round bar sample | |
| CN109870355B (en) | Automatic measurement method for elongation after uniaxial tension fracture of metal plate sample | |
| CN205719813U (en) | A kind of Three Points Bending Specimen ductile fracture toughness JIC test device | |
| CN109127779A (en) | The detection device and straightener of bands for band | |
| Park et al. | Low-constraint toughness testing of two SE (T) methods in a single specimen | |
| US20110271766A1 (en) | Tensile bar marking fixture | |
| CN208983975U (en) | A kind of sample marking distance and length-measuring appliance of having no progeny | |
| JP6607178B2 (en) | Test method for stress corrosion cracking of pipes | |
| RU2645843C1 (en) | Device of determining residual stress | |
| CN104297075A (en) | A metal wire torsion test method for a steel wire rope | |
| ASTM | Standard practice for preparation and use of bent-beam stress-corrosion test specimens | |
| CN105928784A (en) | Method for measuring rupture toughness of hot-rolled carbon steel under plane stress | |
| CN107515168A (en) | A kind of electronic tensile machine school detecting method | |
| CN208206879U (en) | A kind of digital ultrasonic flaw detector with positioning device | |
| Edwards | Spiral Bending Test for Electrodeposited Coatings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20210621 |