CN203479586U - Hard compound material pure I type dynamic fracture specimen - Google Patents
Hard compound material pure I type dynamic fracture specimen Download PDFInfo
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- CN203479586U CN203479586U CN201320534214.8U CN201320534214U CN203479586U CN 203479586 U CN203479586 U CN 203479586U CN 201320534214 U CN201320534214 U CN 201320534214U CN 203479586 U CN203479586 U CN 203479586U
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Abstract
The utility model discloses a hard compound material pure I type dynamic fracture specimen, the overall shape is of a disc shaped structure, the upper and lower surfaces are parallel to each other, two platforms are symmetrically arranged on the disc circumferential direction, the two platforms are parallel and uniform in size, a through straight flute type crack is arranged along the diameter direction between the two platforms on the disc, the through straight flute type crack is symmetrical in regard to the center position of the disc, and the platforms are vertical to the through straight flute type crack; according to the hard compound material pure I type dynamic fracture specimen, the through straight flute type crack is arranged on a specimen, the through straight flute type crack can be directly guided to expand so as to obtain a pure mode I crack, the parallel loading platforms are arranged on the disc circumferential direction, direct contact with an incident rod and a transmission rod is convenient, the stress wave propagation is convenient, the stress concentration can be effectively reduced, and the test reliability requirements can be achieved by simple clamping without the need of a new processing clamp and a pressing rod.
Description
Technical field
The utility model belongs to dynamic fracture-mechanics field, particularly the pure I type of a kind of rigid composite material Dynamic Fracture test specimen.
Background technology
Dynamic fracture-mechanics is one of them branch of solid mechanics, is a study hotspot nearly ten years always.With fracture theory, other branches compare, and dynamic fracture-mechanics is the most jejune branch, and late 1970s is just set up basic concept gradually.Up to now, dynamic fracture-mechanics is not still a ripe subject.Compare with static fracture mechanics, not only there is certain difficulty in dynamic fracture-mechanics in the processing of mathematical problem, and while complicacy physically also makes experimental study work difficulty strengthen.In addition, present stage for the dependence test technical complexity of dynamic fracture-mechanics research and limitation also to restricting the speed of development of this subject.At present, various countries scholar extensively uses Hopkinson pressure bar device (SHPB) to carry out Dynamic Fracture experiment to different materials in the world.Its ultimate principle is to be based upon on the basis of one-dimensional stress ripple, by measuring and the rate of strain of switching signal acquisition material in 101～103 scopes.This requires material test specimen in dynamic load process can under the effect of one-dimensional stress ripple, meet stress equilibrium requirement, and then fracture unstability occurs, but not uses merely SHPB experimental system to obtain shock load.In addition, under shock load, can test specimen meet the fracture of pure I type and be also difficult to guarantee.For this reason, relevant scholar has proposed stub type in succession both at home and abroad, semi-circular, the chevron shaped test specimen of disk.These test specimen structures are not unified and standardization, and the experimental result that same material is recorded also exists certain difference.Article " Effect of Thermal Treatment on the Dynamic Fracture Toughness of Laurentian Granite " adopts semi-circular test specimen in SHPB system, to impact loading, although experimental result meets I type tear type face, but the stress that cannot avoid line style loading to bring is concentrated the experimental error of bringing, and there is certain dispute: when LOADING RATES reaches certain degree, line style loads and causes that stress is concentrated and cause loading zone, prior to precrack place, fracture failure occurs.In addition, as loaded with semi-circular test specimen, need be from new processing incident bar and transmission bar, and accuracy requirement is very high, and experimental cost improves undoubtedly.The prefabricated chevron shaped Crack Disk test specimen experiment Analysis in utilization center in article " Dynamic cracked chevron notched Brazilian disc method for measuring rock fracture parameters ".This experiment member does not need again to process incident bar, can obtain good I type tear type face yet.Yet, chevron shaped pregroove marks geometric form face relative complex, theoretical analysis complexity is loaded down with trivial details, need to carry out many experiments correlation parameter is demarcated.Meanwhile, this kind of test specimen also cannot avoid stress under high loading rate to concentrate the harmful effect bringing, and can stress wave fully be propagated and also have dispute.This two classes test specimen is the model that Chinese scholars is extensively used.Object is to obtain I type tear type face, the impact of the optimization of not considering structure on the accurate authenticity of experimental result.Dynamic Fracture research should and meet the theoretical requirement of one-dimensional stress ripple in conjunction with requirement of experiment.
Summary of the invention
The purpose of this utility model is to provide a kind of theoretical requirement of experiment of one-dimensional stress that is conducive to meet, be convenient to impact under loading environment and clamp firmly in Hopkinson experimental system, realize pure I type tear type face, the pure I type of the rigid composite material Dynamic Fracture test specimen of effectively avoiding Mixed Mode Crack to produce.
The technical solution that realizes the utility model object is:
The pure I type of a kind of rigid composite material Dynamic Fracture test specimen, global shape is disc-shape structure, upper and lower surface is parallel to each other, week at disk is upwards symmetrical arranged two platforms, parallel and the consistent size of two platforms, in diametric(al) on disk between two platforms, arrange and run through straight trough type crackle, run through straight trough type crackle symmetrical about the home position of disk; Platform is with to run through straight trough type crackle vertical.
The utility model compared with prior art, its remarkable advantage:
(1) the utility model is provided with straight trough type and runs through type crackle on test specimen, with prior art, crackle not being set compares, can directly guide straight trough type to run through the expansion of type crackle, thereby obtain pure I type crackle, avoid impacting LOADING RATES and at loading end, produce disorderly crackle when too high.
(2) the utility model is upwards provided with parallel weighted platform in test specimen week, can increase surface of contact, is convenient to directly contact with incident bar, transmission bar, is convenient to stress wave propagation, effectively reduces stress and concentrates; Can realize symmetrical clamping, effectively avoid arc to load the asymmetrical loading bringing simultaneously.
(3) the utility model can strictly reach international material mechanism size regulation, and minimizing experimental result otherness, reaches the optimization of structure and experimental result is accurate, authenticity object; Simplify element structure, thereby avoid very complicated theoretical analysis, directly in crack process zone, analyze; Save experimental cost and time, without new clamp for machining and depression bar, easy clamping just can reach experimental reliability requirement.
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is structure vertical view of the present utility model.
Fig. 3 is structure cut-open view of the present utility model.
Embodiment
In conjunction with Fig. 1:
The pure I type of a kind of rigid composite material of the utility model Dynamic Fracture test specimen, global shape is disc-shape structure, upper and lower surface is parallel to each other, week at disk is upwards symmetrical arranged two platforms, parallel and the consistent size of two platforms, in diametric(al) on disk between two platforms, arrange and run through straight trough type crackle, run through straight trough type crackle symmetrical about the home position of disk; Platform is with to run through straight trough type crackle vertical.
The thickness of described disk is 0.2 times-0.3 times of diameter.
The described length that runs through straight trough type crackle is disk diameter 0.5 times-0.7 times.
It is described that to run through the central angle that straight trough type crack length is corresponding be 15 °-30 °.
Its structure energy implementation structure is optimized, and saves experimental cost and time, and simple for production, exploitativeness is good, without adding other fixtures and mould, can in Hopkinson pressure bar, directly test.
The processing of the utility model test specimen structure is simple, object is to obtain pure I type fracture crack, effectively avoids Mixed Mode Crack to produce, and can strictly reach international material mechanism size regulation, minimizing experimental result otherness, reaches the optimization of structure and experimental result is accurate, authenticity object; Reduce to impact load and to cause loading zone stress concentration effect, first end face is capable to be become and expands Crack prevention loading; Realize one-dimensional stress ripple and fully propagate, for reaching stress equilibrium in experimentation, provide certain condition; Simplify element structure, thereby avoid very complicated theoretical analysis, directly in crack process zone, analyze; Save experimental cost and time, without new clamp for machining and depression bar, easy clamping can directly be tested in Hopkinson pressure bar, can reach experimental reliability requirement.
Embodiment 1:
The pure I type of a kind of rigid composite material of the utility model Dynamic Fracture test specimen, global shape is disc-shape structure, upper and lower surface is parallel to each other, the thickness of disk is 0.2 times of diameter, week at disk is upwards symmetrical arranged two platforms, and the parallel and consistent size of two platforms arranges and runs through straight trough type crackle in the diametric(al) on disk between two platforms, the length that runs through straight trough type crackle is disk diameter 0.6 times, run through straight trough type crackle symmetrical about the home position of disk; Platform is with to run through straight trough type crackle vertical, and running through the central angle that straight trough type crack length is corresponding is 15 °.
Embodiment 2:
The pure I type of a kind of rigid composite material of the utility model Dynamic Fracture test specimen, global shape is disc-shape structure, upper and lower surface is parallel to each other, the thickness of disk is 0.3 times of diameter, week at disk is upwards symmetrical arranged two platforms, and the parallel and consistent size of two platforms arranges and runs through straight trough type crackle in the diametric(al) on disk between two platforms, the length that runs through straight trough type crackle is disk diameter 0.7 times, run through straight trough type crackle symmetrical about the home position of disk; Platform is with to run through straight trough type crackle vertical, and running through the central angle that straight trough type crack length is corresponding is 30 °.
Embodiment 3:
As shown in Figure 1, 2, 3:
The pure I type of a kind of rigid composite material of the utility model Dynamic Fracture test specimen, global shape is disc-shape structure, upper and lower surface is parallel to each other, the thickness of disk is 0.25 times of diameter, week at disk is upwards symmetrical arranged two platforms, and the parallel and consistent size of two platforms arranges and runs through straight trough type crackle in the diametric(al) on disk between two platforms, the length that runs through straight trough type crackle is disk diameter 0.5 times, run through straight trough type crackle symmetrical about the home position of disk; Platform is with to run through straight trough type crackle vertical, and running through the central angle that straight trough type crack length is corresponding is 20 °.
By reference to the accompanying drawings 1, architectural feature is collar plate shape, the central angle that platform is corresponding is 20 ° can effectively change axial impact force into the drawing stress perpendicular to blanking direction, thereby can directly guide straight trough type to run through the expansion of type crackle, thereby obtain pure I type crackle, avoid impacting LOADING RATES and at loading end, produce disorderly crackle when too high.
By reference to the accompanying drawings 2, directly the prefabricated vertical crack that runs through in center, can guide pure I type crackle.
By reference to the accompanying drawings 3, loading end face is designed to weighted platform, can increase surface of contact, be convenient to directly contact with incident bar, transmission bar, be convenient to stress wave propagation, effectively reduce stress and concentrate; Can realize symmetrical clamping, effectively avoid arc to load the asymmetrical loading bringing simultaneously.
Thereby by this kind of structural design, meet requirement of experiment, can under dynamic impulsion condition, obtain pure I type crackle.And can be in the quasistatic of metal, ground class, glass and rigid composite material, dynamic test.
Claims (4)
1. the pure I type of a rigid composite material Dynamic Fracture test specimen, it is characterized in that: global shape is disc-shape structure, upper and lower surface is parallel to each other, week at disk is upwards symmetrical arranged two platforms, parallel and the consistent size of two platforms, in diametric(al) on disk between two platforms, arrange and run through straight trough type crackle, run through straight trough type crackle symmetrical about the home position of disk; Platform is with to run through straight trough type crackle vertical.
2. the pure I type of a kind of rigid composite material according to claim 1 Dynamic Fracture test specimen, is characterized in that :-0.3 times of 0.2 times that the thickness of described disk is diameter.
3. the pure I type of a kind of rigid composite material according to claim 1 Dynamic Fracture test specimen, is characterized in that: the described length that runs through straight trough type crackle is disk diameter 0.5 times-0.7 times.
4. the pure I type of a kind of rigid composite material according to claim 1 Dynamic Fracture test specimen, is characterized in that: described to run through the central angle that straight trough type crack length is corresponding be 15 °-30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320534214.8U CN203479586U (en) | 2013-08-29 | 2013-08-29 | Hard compound material pure I type dynamic fracture specimen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320534214.8U CN203479586U (en) | 2013-08-29 | 2013-08-29 | Hard compound material pure I type dynamic fracture specimen |
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| Publication Number | Publication Date |
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| CN203479586U true CN203479586U (en) | 2014-03-12 |
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| CN201320534214.8U Expired - Fee Related CN203479586U (en) | 2013-08-29 | 2013-08-29 | Hard compound material pure I type dynamic fracture specimen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512782A (en) * | 2013-08-29 | 2014-01-15 | 南京理工大学 | Pure I type dynamic fracture test piece for hard composite material |
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- 2013-08-29 CN CN201320534214.8U patent/CN203479586U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512782A (en) * | 2013-08-29 | 2014-01-15 | 南京理工大学 | Pure I type dynamic fracture test piece for hard composite material |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20150829 |
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| EXPY | Termination of patent right or utility model |