CN106404553A - Auxiliary testing apparatus for ductile fracture toughness J<IC> of three-point bending sample and testing method thereof - Google Patents
Auxiliary testing apparatus for ductile fracture toughness J<IC> of three-point bending sample and testing method thereof Download PDFInfo
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- CN106404553A CN106404553A CN201610446568.5A CN201610446568A CN106404553A CN 106404553 A CN106404553 A CN 106404553A CN 201610446568 A CN201610446568 A CN 201610446568A CN 106404553 A CN106404553 A CN 106404553A
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- 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
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Abstract
The invention provides an auxiliary testing apparatus for the ductile fracture toughness J<IC> of a three-point bending sample and a testing method thereof. According to the method, the opening displacement of a COD gauge at different heights is acquired by means of auxiliary cutter edge devices; the displacement of the force application points of the three-point bending sample is calculated; then the ductile fracture toughness J<IC> of the three-point bending sample is obtained; so safety evaluation of high strength and high toughness can be carried out.
Description
Technical field
The invention belongs to Fracture of Metal Material mechanics properties testing technical field is and in particular to a kind of Three Points Bending Specimen prolongs
Property fracture toughnessJ ICTest device and its method of testing.
Background technology
More and more, the warp applied in engineering as structural material with the raising of metallurgical quality, high-strength and high ductility alloy
Often need to carry out safety evaluation to it.Plane strain fracture toughnessK ІCIt is important safety evaluation index and structure member design refers to
Mark, therefore passes through the plane strain fracture toughness that test obtains high-strength and high ductility alloyK ІCJust it is particularly important.But for height
Strong high-ductility alloy, directly tests plane strain fracture toughnessK ІCTypically 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, obtained by conversion formulaK ІC.Three
Point bend specimen is because form is simple, processing is quick, representativeness becomes Fracture of Metal Material mechanics properties testing neck the advantages of strong
The first-selection of sample form in domain, the especially breach of Three Points Bending Specimen are located 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, because 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 shown in figure 1, test can not obtain effective ductile fracture toughness thenJ IC.At present, most of testers are
Directly to be shifted near like replacing point of application displacement using testing machine rack position, 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 causing test error.
Content of the invention
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
Bright provide a kind of Three Points Bending Specimen ductile fracture toughnessJ ICTest device and its method of testing.The method assists by the edge of a knife
Device obtains the COD rule opening displacement of differing heights, is calculated the point of application displacement of Three Points Bending Specimen, and then obtains at 3 points
The ductile fracture toughness of bend specimenJ ICSo that the safety evaluation work that high-strength and high ductility closes can effectively be carried out.
For realizing above-mentioned technical purpose, be employed technical scheme comprise that：Three Points Bending Specimen ductile fracture toughness JIC assists
Test device, is provided with two groups of edge of a knife sword groups that two COD rule are clamped respectively, and two edge of a knife sword groups are in that differing heights are 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
Put, the snap arm of the both sides of edge of a knife auxiliary device is folded on Three Points Bending Specimen by bolt respectively, before testing, the upper edge of a knife
Two edge of a knife swords of two edge of a knife swords of sword group and lower edge of a knife sword group align in the horizontal direction, in 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 of the present invention and Three Points Bending Specimen.
The bolt head of bolt of the present invention is cambered surface, and the center of pad is provided with the groove matching with bolt head.
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, in three-point bending
The both sides of the Three Points Bending Specimen breach of sample open up symmetrical edge of a knife sword group, the edge of a knife sword of two edge of a knife auxiliary device compositions
Group exists higher than the edge of a knife sword group of Three Points Bending Specimen, two edge of a knife swords of two edge of a knife swords of upper edge of a knife sword group and lower edge of a knife sword group
Align in 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 edge of a knife swords
Group one COD rule of clamping respectively；
Step 2, using three point bending test machine to Three Points Bending Specimen imposed load, two COD advise and apply to two edge of a knife sword groups
Plus tension force, so that edge of a knife auxiliary device is not slided relative to Three Points Bending Specimen, the opening displacement of edge of a knife sword group in testV 1With under
The opening displacement of 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- the distance between the lower edge of a knife and Three Points Bending Specimen surface；
z 2- upper the 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, the Δ of Three Points Bending Specimen is obtained using many SAMPLE METHODa-JResistance
Curve, ductile fracture toughnessJ ICAnd plane strain fracture toughnessK IC.
Present invention has the advantages that：
The method, by edge of a knife auxiliary device, is advised opening displacement by testing the COD of differing heights, is calculated using geometrical principle
To the point of application displacement of Three Points Bending Specimen, then obtain the ductile fracture toughness of sampleJ IC, the data accuracy obtaining is high, mistake
Difference is low.This makes the safety evaluation of high-strength and high ductility alloy work and can effectively carry out.This device has convenient disassembly simultaneously, can
The advantages of to reuse.
Brief description
Fig. 1 is that in prior art, COD rule survey notch opening displacement schematic diagram；
Fig. 2 is point of application displacement measurement schematic diagram of the present invention；
Fig. 3 is edge of a knife auxiliary device fitting plane schematic diagram of the present invention；
Fig. 4 is the side structure schematic view of edge of a knife auxiliary device of the present invention；
Fig. 5 is that edge of a knife auxiliary device of the present invention assembles schematic perspective view；
Fig. 6 is the perspective view of edge of a knife auxiliary device of the present invention；
Fig. 7 is embodiment of the present invention X70 pipe line steel fracture toughnessJ ICSample faces form and size；
Fig. 8 is embodiment of the present invention X70 pipe line steel fracture toughnessJ ICSample overlooks form and size；
Fig. 9 is that 1# sample COD of the present invention advises opening displacementV 1/V 2- loadFCurve；
Figure 10 is 1# sample point of application displacement of the present inventionq- loadFCurve；
Figure 11 is X70 pipe line steel of the present inventionJIntegration and crack extension ΔaGraph of relation；
Figure 12 is the structural representation of bolt of the present invention；
Figure 13 is the perspective view of pad of the present invention；
In figure：1st, edge of a knife auxiliary device, 101, snap arm, 102, bolt, 1021, bolt head, 2, upper edge of a knife sword group, 3, lower edge of a knife 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.
Specific embodiment
Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit and its method of testing, by testing differing heights
COD rule opening displacement, be calculated the point of application displacement of Three Points Bending Specimen using geometrical principle, test philosophy is shown in Fig. 2, applies
Force displacementqCan be by formula（2）Calculate and obtain.
（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 2The distance between-two edges of a knife and specimen surface；
The test of point of application displacement to be realized by edge of a knife auxiliary device.Edge of a knife auxiliary device include a pair of edge of a knife sword, pad and
Bolt etc..A pair of edge of a knife sword is respectively symmetrically and is placed in three-point bendingJ ICThe both sides of sample break, are divided by four pads and four bolts
Not do not fix edge of a knife auxiliary device from front, rear, left and right, another knife product sword is opened on Three Points Bending Specimen it is ensured that sample break
The edge of a knife of both sides on same horizontal line, as shown in Fig. 3,4,5, and COD advise apply tension force to two edge of a knife sword groups when
Ensure that its sample relatively does not slide.
Using auxiliary device indirectly testing Three Points Bending Specimen the point of application displacement when there is problems with：1. three-point bending
Two edge of a knife sword in the vertical directions of the every side of sample break need to align, as shown in Fig. 2 A1 and B1 needs on one wire, A2
Also need on one wire with B2, such guarantee is correct according to the point of application displacement that similar triangles conversion obtains.2.
The edge of a knife of Three Points Bending Specimen breach both sides needs to align, as shown in Fig. 2 A1 and A2 need to be in a horizontal line in the horizontal direction
On, B1 and B2 also need to be on a horizontal line, the point of application displacement that also guarantee obtains according to similar triangles conversion in the same manner
It is correct.3., when the edge of a knife is applied on COD rule with the tension force to breach both sides, 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 through similar triangles conversion is effective.
To sum up, 1. the edge of a knife auxiliary device in the present invention adopts wire cutting one-shot forming it is ensured that two symmetrically arranged edge of a knife auxiliary fill
Two edge of a knife swords put are on one wire；2. two edge of a knife auxiliary device adopt left and right matched design, and correspondingly-sized is all the same,
And bolt location dimension is same, the blade so ensuring that breach both sides is on same horizontal line；3. adopt spiral shell
Anchoring position, using pad bump contact stress it is ensured that edge of a knife auxiliary device and sample are not sent out between bolt and sample
Raw slip relatively.
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
Device is helped to include the upper edge of a knife sword group advised for one COD of installation, and for positioning and installing carrying of edge of a knife auxiliary device
The pad of central recess and the bolt with cambered surface bolt head.
As 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 apart from Three Points Bending Specimen breach 5mm, add band in front left, front right, rear left, four positions of rear right
There is the pad of central recess, and from four position installation bolts simultaneously, bolt head is pressed on pad, ensure in installation process
The edge of a knife auxiliary device of the left and right sides keeps horizontality.
Embodiment 1
A kind of Three Points Bending Specimen ductile fracture toughnessJ ICAfter test device invention success, to multiple trades mark and different-thickness pipe
Line Steel material, has carried out the ductile fracture toughness under air and briny environmentJ ICTest.Below with the examination of a pipe line steel material
Test as embodiment.
1st, test material：X70 pipe line steel
2nd, condition of heat treatment：Quenched
3rd, test temperature：23 ~ 25 DEG C of envionmental humidities：40~50%
4th, specimen types：SE (B) sample, its geomery see Fig. 7,8.
5th, pilot project：Ductile fracture toughnessJ ICTest
6th, test method：Edge of a knife auxiliary device is arranged on X70 pipe line steel SE (B) sample, opens up the lower edge of a knife in breach both sides
Sword group, using the opening displacement of two COD rule two edge of a knife sword groups of testV 1WithV 2, by formula（2）The force of sample can be obtained
Point displacementq, the Δ of X70 pipe line steel is obtained using many SAMPLE METHODa-JResistance curve, ductile fracture toughnessJ ICAnd plane strain fracture
ToughnessK IC.
7th, result of the test：
7.1st, point of application displacementq
Because each sample obtains point of application displacementqMethod the same, only provide 1# sample point of application displacement belowqTest knot
Really.The 1# sample COD rule opening displacement of testing machine automatic data collectionV 1/V 2- loadFCurve is shown in Fig. 9, via formula（1）Process obtains
1# sample point of application displacementq- loadFCurve is shown in Figure 10.
7.2nd, test data
By point of application displacementq- loadFCurve can obtain each sample and shut down point loadF sWith plasticity componentU p, can by measurement
To obtain the thickness of each sampleB, widthW, Initial crack lengtha 0With crack extension Δa, calculate and can obtain by formula
Each sampleJValue.Test data is shown in Table 1.
Table 1 test data
7.3rd, X70 pipe line steel Δa-JResistance curve（See Figure 11）
7.4th, X70 pipe line steel Δa-JResistance curve equation
J=312.07×Δa 0.5784(R=0.9893)
7.5th, result of the test（It is shown in Table 2）
Table 2 result of the test
.
Claims (4)
1. Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit it is characterised in that：It is provided with two groups two COD are advised
The edge of a knife sword group clamping respectively（8）, two edge of a knife sword groups（8）Arrange in differing heights, lower edge of a knife sword group（3）Two edge of a knife swords
It is symmetrically arranged at Three Points Bending Specimen breach（4）Both sides, and be opened in Three Points Bending Specimen（5）On, upper edge of a knife sword group（2）Two
Individual edge of a knife sword is separately positioned on the edge of a knife auxiliary device of two symmetrically arranged Three Points Bending Specimen breach both sides（1）On, the edge of a knife
Auxiliary device（1）Both sides snap arm（101）Pass through bolt respectively（102）It is folded in Three Points Bending Specimen（5）On, in test
Before, upper edge of a knife sword group（2）Two edge of a knife swords and lower edge of a knife sword group（3）Two edge of a knife swords align in the horizontal direction, with
Two edge of a knife sword groups of side（8）The alignment of two edge of a knife sword in the vertical directions.
2. Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit as claimed in claim 1 it is characterised in that：Institute
The bolt stated（102）And Three Points Bending Specimen（5）Between be provided with pad（7）.
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 stated（102）Bolt head（1021）For cambered surface, pad（7）Center be provided with and bolt head（1021）The groove matching
（701）.
4. the method for testing of Three Points Bending Specimen ductile fracture toughness JIC auxiliary test unit as claimed in claim 1, it is special
Levy and be：Comprise 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, in three-point bending
The both sides of the Three Points Bending Specimen breach of sample open up symmetrical edge of a knife sword group, the edge of a knife sword of two edge of a knife auxiliary device compositions
Group exists higher than the edge of a knife sword group of Three Points Bending Specimen, two edge of a knife swords of two edge of a knife swords of upper edge of a knife sword group and lower edge of a knife sword group
Align in 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 edge of a knife swords
Group one COD rule of clamping respectively；
Step 2, using three point bending test machine to Three Points Bending Specimen imposed load, two COD advise and apply to two edge of a knife sword groups
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 1With under
The opening displacement of 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- the distance between the lower edge of a knife and Three Points Bending Specimen surface；
z 2- upper the 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, the Δ of Three Points Bending Specimen is obtained using many SAMPLE METHODa-JResistance
Curve, ductile fracture toughnessJ ICAnd plane strain fracture toughnessK IC.
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| 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 |
| CN108333045A (en) * | 2018-01-11 | 2018-07-27 | 中国石油大学(北京) | A kind of double cantilever beam fracture toughness test method that can induce intrinsic sharp crack |
| CN112748002A (en) * | 2020-12-17 | 2021-05-04 | 杭州电子科技大学 | Method for measuring notch opening amount in measurement of fracture toughness of pyrolytic carbon for artificial heart valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN108333045A (en) * | 2018-01-11 | 2018-07-27 | 中国石油大学(北京) | A kind of double cantilever beam fracture toughness test method that can induce intrinsic sharp crack |
| CN108333045B (en) * | 2018-01-11 | 2020-01-17 | 中国石油大学(北京) | Double-cantilever-beam fracture toughness testing method capable of inducing intrinsic sharp cracks |
| CN112748002A (en) * | 2020-12-17 | 2021-05-04 | 杭州电子科技大学 | Method for measuring notch opening amount in measurement of fracture toughness of pyrolytic carbon for artificial heart valve |
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