CN107367427A - A kind of SHPB experimental methods for concrete material - Google Patents
A kind of SHPB experimental methods for concrete material Download PDFInfo
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- CN107367427A CN107367427A CN201710749130.9A CN201710749130A CN107367427A CN 107367427 A CN107367427 A CN 107367427A CN 201710749130 A CN201710749130 A CN 201710749130A CN 107367427 A CN107367427 A CN 107367427A
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- 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
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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Abstract
The invention discloses a kind of SHPB experimental methods for concrete material, for testing the Poisson's ratio of concrete sample, while reduce the error of concrete SHPB experiments, method and step is as follows：The cylindrical concrete test specimen for SHPB experiments is prepared first, secondly above-mentioned concrete sample is pre-processed, then symmetrically posts two 45 degree of strain rosettes in concrete sample side wall after the pre-treatment, and 45 degree of strain rosettes are connected by deformeter with oscillograph；Then above-mentioned concrete sample is fixed between incident bar and transmission bar by fixture and protective case, and the foil gauge is connected by deformeter with oscillograph；Last emission bullet, carry out SHPB experiments.The present invention can measure its Poisson's ratio using 45 degree of strain rosettes being attached on concrete sample, simpler and easy to operate than conventional Poisson ratio measuring method；By the pretreatment to concrete sample, the error in experimentation can be reduced, improve the degree of accuracy of experiment.
Description
Technical field
The invention belongs to material property testing field, and in particular to a kind of SHPB experimental methods for concrete material.
Background technology
Split hopkinson press bar is the major experimental device for measuring material dynamic mechanical performance (stress-strain diagram)
One of, it measures Loaded contact analysis using the foil gauge that is affixed on incident bar and transmission bar, using one-dimensional in one-dimensional wave theory
Strain is assumed and test specimen internal stress or strain homogenization it is assumed that extrapolate is clipped in the dynamic stress and strain of test specimen between two bars and closed
System, avoids the difficulty of direct measurement test specimen ess-strain under percussion, has been obtained a wide range of applications since proposition.
The accurate dynamic stress strain curve of experiment material is obtained, it is basic must to be fulfilled for above-mentioned two in whole experiment process
Assuming that.The principal element of uniaxial train basic assumption is influenceed in whole experiment process to be included：End face between test specimen and pole
Friction effect；And the principal element for influenceing test specimen internal stress or strain homogenization basic assumption mainly includes：Incidence wave waveform.
Due to the particularity of concrete material, its failure strain very little, belong to fragile material；Meanwhile in process it is difficult to ensure that
The flatness and roughness of test specimen section.These problems cause concrete material during SHPB experiments are carried out, concrete
The roughness of test specimen end face crosses ambassador's concrete and produces obvious transverse inertia domino effect, can not meet uniaxial train basic assumption,
And concrete material is very sensitive to transverse inertia domino effect.The low failure strain of flatness and concrete material of test specimen end face,
Test specimen internal stress or strain is set to be extremely difficult to homogenize., can be by processing side for traditional material, such as metal material
Method, material self-characteristic and traditional experimental method etc. meet requirement of experiment.But for concrete material in material property and
The certain situation of processing method, dynamic is implemented to concrete material on Hopkinson lever apparatus using the experimental method of routine
Experiment, it is even incredible that its result will have a very big error, and this is allowed for it is contemplated that being carried out to SHPB experimental methods
Improve, experiment is met two basic assumptions of SHPB, obtain accurate believable experimental data.
The content of the invention
It is an object of the invention to provide a kind of SHPB experimental methods for concrete material, solve in SHPB experiments
Because concrete sample surface roughness it is excessive caused by transverse inertia domino effect the problem of；Solve concrete sample end face simultaneously to put down
It is whole to spend big and concrete material failure strain smaller the problem of causing concrete sample internal stress uneven.
The technical solution for realizing the object of the invention is：A kind of SHPB experimental methods for concrete material, it is used for
The Poisson's ratio of concrete sample is tested, while reduces the error of concrete SHPB experiments, method and step is as follows：
Step 1, prepare the cylindrical concrete test specimen tested for SHPB；
Step 2, above-mentioned concrete sample is pre-processed：
In two end face coating packed layers of concrete sample, and in packed layer outer wall wrap film；
Two 45 degree of strain rosettes, 45 degree of strains are symmetrically posted in step 3, concrete sample side wall after the pre-treatment
Flower is connected by deformeter with oscillograph；
Step 4, the concrete sample in step 3 is fixed between incident bar and transmission bar by fixture and protective case,
And the foil gauge is connected by deformeter with oscillograph；
Step 5, emission bullet, carry out SHPB experiments：
Emission bullet, hits the shock end face of incident bar, and back wave, the transmitted wave of concrete sample are amplified by deformeter
It is shown on oscillograph, while the axially and longitudinally waveform of 45 degree of strain rosettes is shown enlarged on oscillograph by deformeter, it is right
Waveform on oscillograph is handled, and the stress-strain diagram of concrete sample can be obtained according to back wave and transmitted wave, and
The axial strain and longitudinal strain that 45 degree of strain rosettes measure are used for the Poisson's ratio for testing concrete sample.
Compared with prior art, its remarkable advantage is the present invention：(1) using 45 degree of strains being attached on concrete sample
Its Poisson's ratio can be measured by spending, simpler and easy to operate than conventional Poisson ratio measuring method；(2) by the pre- of concrete sample
Processing, can reduce the error in experimentation, improve the degree of accuracy of experiment；(3) fixture fixing concrete test specimen, a side are passed through
Face can ensure that concrete sample and incident bar and transmission bar boom end are brought into close contact, on the other hand it is also ensured that experimentation
In safety；(4) this experimental method can make standardized and orderly progress in SHPB experimentations, while it is also ensured that experimental result
Accuracy.
Brief description of the drawings
Fig. 1 is concrete sample Poisson's ratio of the present invention measurement 45 degree of strain rosette schematic diagrames used.
Fig. 2 is the schematic diagram that concrete sample of the present invention sticks 45 degree of strain rosettes.
Fig. 3 is the schematic diagram of concrete sample end face of the present invention pretreatment.
Fig. 4 is the schematic diagram that concrete of the present invention is fixed on by fixture between incident bar and throwing-stick.
Fig. 5 is that compound shaping piece of the present invention is attached to the schematic diagram that incident bar hits end face.
Fig. 6 is that compound shaping piece of the present invention delays peak stress rise time schematic diagram.
Fig. 7 is the flow chart for the SHPB experimental methods that the present invention is used for concrete material.
In figure, 1- concrete samples, 2- incident bars, 3- transmission bars, 4- fixtures, 5- protective cases, 6-45 degree strain rosettes, 7- fills out
Fill layer, 8- films, 9- shaping pieces
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
With reference to Fig. 7, the present invention proposes a kind of SHPB experimental methods for concrete material, can test concrete examination
The Poisson's ratio of part 1, while reduce the error of concrete SHPB experiments, method and step is as follows：
Step 1, prepare the cylindrical concrete test specimen 1 tested for SHPB.
Step 2, above-mentioned concrete sample 1 is pre-processed：
Because concrete belongs to fragile material, during pouring concrete sample 1 end face out-of-flatness and exist permitted
Concrete dynamic modulus, by coating packed layer 7 to 1 two end faces of concrete sample, and (as shown in Figure 3) is wrapped up using film 8, made
The stress that must be acted on concrete sample 1 turns into trus stress, and can reduce the friction effect of end face.
Two 45 degree of strain rosettes 6 are symmetrically posted in step 3, the side wall of concrete sample 1 after the pre-treatment, described 45 degree should
Change spends 6 to be connected by deformeter with oscillograph (such as Fig. 1 and Fig. 2).
Step 4, pretreated concrete sample is fixed on incident bar 2 and transmission bar 3 by fixture 4 and protective case 5
Centre (as shown in Figure 4), post shaping piece 9 (as shown in Figure 5) in the shock end face of incident bar 2, be on the one hand to filter
High-frequency sasser in loading procedure, on the other hand it is to delay stress wave peak rise-time (as shown in Figure 6), make coagulation
Strain rate in native test specimen 1 keeps constant before broken, posts foil gauge on incident bar 2 and transmission bar 3 respectively, and by described in
Foil gauge is connected by deformeter with oscillograph.
Step 5, emission bullet, carry out SHPB experiments：
Emission bullet, the shock end face of incident bar 2 is hit, back wave, the transmitted wave of concrete sample 1 are put by deformeter
It is shown on oscillograph greatly, while the axially and longitudinally waveform of 45 degree of strain rosettes 6 is shown enlarged on oscillograph by deformeter,
Waveform on oscillograph is handled, the stress-strain diagram of concrete sample 1 can be obtained according to back wave and transmitted wave,
And the axial strain and longitudinal strain that 45 degree of strain rosettes 6 measure are used for the Poisson's ratio for testing concrete sample 1.
Packed layer 7 in above-mentioned steps 2 uses epoxy resin.
In experimentation, by the pretreatment to concrete sample 1, test specimen etc. is fixed using fixture 4, on the one hand can be with
Reduce the error of experiment, on the other hand can ensure that concrete sample 1 crushes the experimenter to around in experimentation and caused
Harm, while also ensure experiment it is orderly, carried out according to certain flow safety standard.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
With reference to Fig. 7, the present invention proposes a kind of SHPB experimental methods for concrete material, can test concrete examination
The Poisson's ratio of part 1, while reduce the error of concrete SHPB experiments, method and step is as follows：
Step 1, cylindrical concrete test specimen 1 of the size for 74 × 37mm of φ is prepared for SHPB experiments.
Step 2, above-mentioned concrete sample 1 is pre-processed：
Because concrete belongs to fragile material, during pouring concrete sample 1 end face out-of-flatness and exist permitted
Concrete dynamic modulus, by coating packed layer 7 to 1 two end faces of concrete sample, and (as shown in Figure 3) is wrapped up using film 8, made
The stress that must be acted on concrete sample 1 turns into trus stress, and can reduce the friction effect of end face.
Two 45 degree of strain rosettes 6 are symmetrically posted in step 3, the side wall of concrete sample 1 after the pre-treatment, described 45 degree should
Change spends 6 to be connected by deformeter with oscillograph.
Step 4, as shown in figure 4, pretreated concrete sample is fixed on into incident bar 2 by fixture 4 and protective case 5
With the centre of transmission bar 3, the size of incident bar and transmission bar is respectively 100 × 1800mm of φ 100 × 2700mm and φ；In incidence
The shaping piece 9 (as shown in Figure 5) of copper material is posted in the shock end face of bar 2, is on the one hand to filter the height in loading procedure
The frequency wave of oscillation, on the other hand it is to delay stress wave peak rise-time (as shown in Figure 6), makes answering in concrete sample 1
Variability keeps constant before broken, posts foil gauge on incident bar 2 and transmission bar 3 respectively, and by the foil gauge by answering
Become instrument to be connected with oscillograph.
Step 5, emission bullet, carry out SHPB experiments：
The bullet that transmitting size is φ 100 × 800, the shock end face of shock incident bar 2, the back wave of concrete sample 1,
Transmitted wave is shown enlarged on oscillograph by deformeter, while the axially and longitudinally waveform of 45 degree of strain rosettes 6 passes through deformeter
It is shown enlarged on oscillograph, the waveform on oscillograph is handled, concrete can be obtained according to back wave and transmitted wave
The stress-strain diagram of test specimen 1, and the axial strain and longitudinal strain that 45 degree of strain rosettes 6 measure are used to test concrete sample 1
Poisson's ratio.
Packed layer 7 in above-mentioned steps 2, using epoxy resin.
In experimentation, by the pretreatment to concrete sample 1, test specimen etc. is fixed using fixture 4, on the one hand can be with
Reduce the error of experiment, on the other hand can ensure that concrete sample 1 crushes the experimenter to around in experimentation and caused
Harm, while also ensure experiment it is orderly, carried out according to certain flow safety standard.
Claims (3)
- A kind of 1. SHPB experimental methods for concrete material, for testing concrete sample（1）Poisson's ratio, reduce simultaneously The error of concrete SHPB experiments, it is characterised in that method and step is as follows：Step 1, prepare the cylindrical concrete test specimen tested for SHPB（1）；Step 2, to above-mentioned concrete sample（1）Pre-processed：In concrete sample（1）Two end faces coat packed layer（7）, and in packed layer（7）Outer wall wrap film（8）；Step 3, concrete sample after the pre-treatment（1）Two 45 degree of strain rosettes are symmetrically posted in side wall（6）, described 45 degree should Become flower（6）It is connected by deformeter with oscillograph；Step 4, by the concrete sample in step 3（1）Pass through fixture（4）And protective case（5）It is fixed on incident bar（2）And transmission Bar（3）Between, and the foil gauge is connected by deformeter with oscillograph；Step 5, emission bullet, carry out SHPB experiments：Emission bullet, hit incident bar（2）Shock end face, concrete sample（1）Back wave, transmitted wave put by deformeter It is shown on oscillograph greatly, while 45 degree of strain rosettes（6）Axially and longitudinally waveform oscillograph is shown enlarged in by deformeter On, the waveform on oscillograph is handled, concrete sample can be obtained according to back wave and transmitted wave（1）Ess-strain Curve, and 45 degree of strain rosettes（6）The axial strain and longitudinal strain measured is used to test concrete sample（1）Poisson's ratio.
- 2. the SHPB experimental methods according to claim 1 for concrete material, it is characterised in that：In above-mentioned steps 2 Packed layer（7）Using epoxy resin.
- 3. the SHPB experimental methods according to claim 1 for concrete material, it is characterised in that：In the step 4, In incident bar（2）Shock end face post shaping piece（9）, make concrete sample（1）In strain rate keep constant before broken, And incident bar（2）And transmission bar（3）It is upper to post foil gauge respectively.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375501A (en) * | 2018-01-25 | 2018-08-07 | 南京理工大学 | A kind of data processing method based on split hopkinson press bar experimental technique |
| CN110133104A (en) * | 2019-05-30 | 2019-08-16 | 东北大学 | A kind of full age dynamic characteristics test method of obturation |
| CN110595922A (en) * | 2019-08-20 | 2019-12-20 | 南京理工大学 | Data processing method under load of concrete material SHPB (prestressed high Performance concrete) non-constant strain rate |
| CN112304785A (en) * | 2020-10-26 | 2021-02-02 | 广东工业大学 | Hopkinson bar device for preventing test piece from falling off |
| CN113776962A (en) * | 2021-09-07 | 2021-12-10 | 广东工业大学 | Concrete impact test auxiliary fixtures and concrete impact test device |
| CN114254423A (en) * | 2021-12-21 | 2022-03-29 | 中国人民解放军陆军勤务学院 | Method for calculating structural effect of porous concrete SHPB test with randomly distributed spherical pores |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108375501A (en) * | 2018-01-25 | 2018-08-07 | 南京理工大学 | A kind of data processing method based on split hopkinson press bar experimental technique |
| CN108375501B (en) * | 2018-01-25 | 2021-04-16 | 南京理工大学 | Data processing method based on separated Hopkinson pressure bar experiment technology |
| CN110133104A (en) * | 2019-05-30 | 2019-08-16 | 东北大学 | A kind of full age dynamic characteristics test method of obturation |
| CN110133104B (en) * | 2019-05-30 | 2021-07-30 | 东北大学 | Method for testing dynamic mechanical characteristics of full-age filling body |
| CN110595922A (en) * | 2019-08-20 | 2019-12-20 | 南京理工大学 | Data processing method under load of concrete material SHPB (prestressed high Performance concrete) non-constant strain rate |
| CN112304785A (en) * | 2020-10-26 | 2021-02-02 | 广东工业大学 | Hopkinson bar device for preventing test piece from falling off |
| CN113776962A (en) * | 2021-09-07 | 2021-12-10 | 广东工业大学 | Concrete impact test auxiliary fixtures and concrete impact test device |
| CN114254423A (en) * | 2021-12-21 | 2022-03-29 | 中国人民解放军陆军勤务学院 | Method for calculating structural effect of porous concrete SHPB test with randomly distributed spherical pores |
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Application publication date: 20171121 |