CN203479643U - Test piece for testing fracture toughness of type-III cracks - Google Patents
Test piece for testing fracture toughness of type-III cracks Download PDFInfo
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- CN203479643U CN203479643U CN201320556391.6U CN201320556391U CN203479643U CN 203479643 U CN203479643 U CN 203479643U CN 201320556391 U CN201320556391 U CN 201320556391U CN 203479643 U CN203479643 U CN 203479643U
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Abstract
The utility model discloses a test piece for testing the fracture toughness of type-III cracks. The test piece is a rectangular flat test piece, wherein the long side of the test piece is more than the broadside of the test piece and the broadside is more than the thickness of the test piece; initial cracks are symmetrically formed on two sides of the flat plate along the broadside direction; symmetrical V-shaped edge cutting grooves are formed on two sides of the flat plate along the thickness direction. The test piece disclosed by the utility model can be used for effectively and stably testing the fracture toughness of the type-III cracks of a plastic material, and an experiment can be finished on a general universal testing machine.
Description
Technical field
The utility model belongs to solid mechanics basic mechanical characteristic test field, particularly a kind of test test specimen of III type crack fracture toughness.
Background technology
Material fracture toughness is a basic parameter of fracturing mechanics, is the tolerance that material stops macroscopic cracking unstable propagation ability, is also the Roughness Parameter of material opposing brittle rupture.The size of it and crackle itself, shape and applied stress size have nothing to do.The intrinsic characteristic of material, only relevant with material itself, thermal treatment and processing technology.It is the critical value of stress intensity factor.The energy that before conventional fracture, object absorbs or outer bound pair object institute work represent.
Basic fracture mode has I type, II type, III type.Opening mode fracture (open mode) is also named in the fracture of I type, is that a kind of danger is the most also to study the most deep fracture mode.Sliding mode fracture (slide mode) is also in the fracture of II type, and tearing mode fracture (twist mode) is also named in the fracture of III type, and they are all relevant with shear stress.Measurement about I type, II type fracture basic parameter has had significant progress, method of testing agrees to that some has formed standard, as tested for measuring the compact tension specimen of I type fragmentation parameters, monolateral lancing-drawing experiment, Double-Notched stretching experiment, monolateral otch three-point bending test, centre burst compression test etc.; For measuring single shear experiment, the double-shear experiment of II type fragmentation parameters, side openings three-point bending test etc.
Research about III type crack initiation is fewer, fails to form unified standard and method.The method of current use has: chute type crackle is sheared (crack rail shear), semi-girder cracking (split cantilever beam) shearing, limit crackle reverses (edge crack torsion), Incline Crack stretching (slant notch tension) etc., yet these methods exist certain defect.What have can not provide pure shear stress, fracture is no longer simple III type fracture, becomes Mixed Mode Fracture and (sees A comparison of Mode III threshold under simple shear and RCF conditions, M.G.Tarantino, S.Beretta, S.Foletti, J.Lai, Engineering Fracture Mechanics, Volume78, Issue8, May2011, Pages1742 – 1755).What have is the restriction that is subject to test specimen and material self character, and I type, the fracture of II type occur in experimentation, causes experiment success rate low.Or experiment needs proprietary experimental facilities, completes on universal testing machine again.Document " Design and analysis of a new six-point edge crack torsion (6ECT) specimen for mode III interlaminar fracture characterisation " (A.B.Pereira, A.B.de Morais, M.F.S.F.de Moura, Composites Part A:Applied Science and Manufacturing, Volume42, Issue2, February2011, Pages131 – 139), 6 border load tests of a kind of lath-shaped test specimen have been proposed, in test, load(ing) point is more, and be unfavorable for asymmetrical load, therefore be necessary test test specimen and the experimental technique of III type crack fracture toughness to make improvement.
Summary of the invention
The purpose of this utility model is to provide a kind of grade enough effective and easy-operating for measuring the test test specimen of III type crack fracture toughness.
The technical solution that realizes the utility model object is:
A test test specimen for III type crack fracture toughness, test specimen is rectangular flat plate test specimen, long limit ﹥ broadside ﹥ thickness, the symmetria bilateralis in dull and stereotyped broadside arranges initial crack, and symmetrical V-type limit grooving is set on the both sides of slab-thickness direction.
The utility model compared with prior art, its remarkable advantage:
(1) utilize the test test specimen of the utility model III type crack fracture toughness, can guarantee relative pure shear strain, guarantee that test specimen is fractured into III type crack fracture.
(2) the simple easy operating of test specimen of the present utility model and processing, experiment is simple, is conducive to less experiment fees.
(3) utilize test specimen of the present utility model to coordinate special-purpose fixture can on universal testing machine, complete the test of fracture toughness, thereby experimental system is simple, is conducive to eliminate the systematic error of test.
(4) the utility model test specimen, before test specimen does not rupture, can be measured the modulus of shearing of material.
(5) utilize the test result of the utility model test specimen can be directly used in test specimen fracture toughness, and do not need intermediate conversion steps, calculate simply.
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the front view of the test test specimen of the utility model III type crack fracture toughness.
Fig. 2 is the side view of the test test specimen of the utility model III type crack fracture toughness.
Fig. 3 is axonometric drawing and the power loading figure of the test test specimen of the utility model III type crack fracture toughness.
Embodiment
The test test specimen of a kind of III type of the utility model crack fracture toughness, test specimen is rectangular flat plate test specimen, long limit ﹥ broadside ﹥ thickness, the symmetria bilateralis in dull and stereotyped broadside arranges initial crack, and symmetrical V-type limit grooving is set on the both sides of slab-thickness direction.The length of test specimen and width are more than the octuple of thickness.The degree of depth of the V-type limit grooving of test specimen is less than 1/4 of specimen thickness.The length of the initial crack of test specimen is less than 1/4 of specimen thickness.
In conjunction with Fig. 1, Fig. 2, Fig. 3, the test of III type crack fracture toughness adopts the method for the power loadings such as 2 support, at 2.Test specimen is positioned at xy plane, and initial crack and limit grooving are parallel to x axle.A, a ' are two strong points of test specimen, and b, b ' are power load(ing) point.Anchorage force is parallel to z axle, be parallel to-z of loading force P direction axle.This loading method can guarantee to provide pure shear stress for test specimen.Test specimen is plate Double-Notched test specimen, and the test specimen symmetria bilateralis initial sharp preset crackle that distributing, with the rift direction of pilot specimen; The preset limit of test specimen side grooving, guarantees that test specimen fracture crack is along x axle expansion expansion.
The test test specimen of the utility model III type crack fracture toughness, the length of test specimen and width are greater than 8 times of thickness.
The test test specimen of the utility model III type crack fracture toughness, the preset limit grooving of test specimen is V-type point limit grooving, to guide crack fracture.
The test test specimen of the utility model III type crack fracture toughness, the limit cutting groove depth of test specimen must not be greater than 1/4 of specimen thickness, to guarantee that test specimen has enough physical strengths.
The test test specimen of the utility model III type crack fracture toughness, its experiment loading method is diagonal angle asymmetrical load, on different diagonal line, loading direction is contrary, take and guarantees to provide pure shear stress as test specimen.
The test test specimen of the utility model III type crack fracture toughness, its experiment loading force and anchorage force direction are all perpendicular to test specimen plane, and opposite direction, to guarantee that shear stress direction is perpendicular to direction of crack propagation.
The test test specimen of the utility model III type crack fracture toughness, simultaneously can be for test modulus of shearing for the test of III type crack fracture toughness.
The test test specimen use procedure of the utility model III type crack fracture toughness is as follows: test specimen be placed horizontally at supporting seat on, supporting seat fulcrum contacts with a, a ' point, guarantee that test specimen is vertical with support direction, then experimental facilities loads test specimen, two load(ing) points act on b, b ' point, and loading direction is perpendicular to test specimen plane.This kind of loading method can guarantee that the pure shear that provides relative loads, and has also guaranteed the simple of experimental technique.
Facts have proved, the test test specimen of III type crack fracture toughness can be used in the test of III type crack fracture toughness, and experiment success rate has higher success ratio with respect to other experimental technique, the pure shear of assurance such as grade simultaneously loading, operation is simple, is conducive to the elimination of experimental system error.
Embodiment 1:
By the test test specimen of the utility model III type crack fracture toughness, be applied to, in the III type crack fracture toughness measurement of double base propellant, make the test test specimen of the plate III type crack fracture toughness of double base propellant.For guaranteeing the validity of test, according to the explanation of claim in the utility model, the long 100mm of test specimen, wide 80mm.Because density of material is less, and rigidity is relatively large, therefore the desirable thickness 8mm of thickness, Initial crack length is got 10mm, because the less toughness of the modulus of double base propellant is less, V-type cutting groove depth is got 1mm.Facts have proved, the test test specimen of utility model III type crack fracture toughness can well be applied to the III type crack fracture toughness of double base propellant and measure, and test specimen disconnects along grooving direction, has proved and has been fractured into III type, is loaded as shear strain.
Embodiment 2:
By the test test specimen of the utility model III type crack fracture toughness, be applied to, in the III type crack fracture toughness measurement of No. 45 steel, make the test test specimen of the plate III type crack fracture toughness of No. 45 steel.For guaranteeing the validity of test, according to the explanation of claim in the utility model, the long 100mm of test specimen, wide 80mm.Because the density of steel is larger, test result is easily subject to the impact of material deadweight, therefore specimen thickness is got 8mm, and Initial crack length 10mm, because the modulus of steel is larger, and toughness is larger, therefore V-type cutting groove depth is got 2mm.Facts have proved, the test test specimen of utility model III type crack fracture toughness can well be applied to the III type crack fracture toughness of No. 45 steel and measure, and test specimen disconnects along grooving direction, has proved and has been fractured into III type, is loaded as shear strain.
Claims (4)
1. the test test specimen of an III type crack fracture toughness, it is characterized in that: test specimen is rectangular flat plate test specimen, long limit ﹥ broadside ﹥ thickness, the symmetria bilateralis in dull and stereotyped broadside arranges initial crack, and symmetrical V-type limit grooving is set on the both sides of slab-thickness direction.
2. the test test specimen of a kind of III type crack fracture toughness according to claim 1, is characterized in that: the length of described test specimen and width are more than the octuple of thickness.
3. the test test specimen of a kind of III type crack fracture toughness according to claim 1, is characterized in that: the degree of depth of the V-type limit grooving of described test specimen is less than 1/4 of specimen thickness.
4. the test test specimen of a kind of III type crack fracture toughness according to claim 1, is characterized in that, the length of the initial crack of described test specimen is less than 1/4 of specimen thickness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320556391.6U CN203479643U (en) | 2013-09-06 | 2013-09-06 | Test piece for testing fracture toughness of type-III cracks |
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| CN201320556391.6U CN203479643U (en) | 2013-09-06 | 2013-09-06 | Test piece for testing fracture toughness of type-III cracks |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471935A (en) * | 2013-09-06 | 2013-12-25 | 南京理工大学 | Test piece for fracture toughness of III type cracks |
| CN106404487A (en) * | 2016-10-08 | 2017-02-15 | 四川大学 | Rock test sample for rock shearing strength test and testing method thereof |
| CN108061684A (en) * | 2017-12-15 | 2018-05-22 | 云南省建设投资控股集团有限公司 | A kind of method for definite fluting beams of concrete fatigue fracture energy |
-
2013
- 2013-09-06 CN CN201320556391.6U patent/CN203479643U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471935A (en) * | 2013-09-06 | 2013-12-25 | 南京理工大学 | Test piece for fracture toughness of III type cracks |
| CN106404487A (en) * | 2016-10-08 | 2017-02-15 | 四川大学 | Rock test sample for rock shearing strength test and testing method thereof |
| CN108061684A (en) * | 2017-12-15 | 2018-05-22 | 云南省建设投资控股集团有限公司 | A kind of method for definite fluting beams of concrete fatigue fracture energy |
| CN108061684B (en) * | 2017-12-15 | 2020-01-10 | 云南省建设投资控股集团有限公司 | Method for determining fatigue fracture energy of slotted concrete beam |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20150906 |
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| EXPY | Termination of patent right or utility model |