CN203479642U - Shear test piece for research of viscoelastic material type II fracture under high strain rate condition - Google Patents
Shear test piece for research of viscoelastic material type II fracture under high strain rate condition Download PDFInfo
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- CN203479642U CN203479642U CN201320532760.8U CN201320532760U CN203479642U CN 203479642 U CN203479642 U CN 203479642U CN 201320532760 U CN201320532760 U CN 201320532760U CN 203479642 U CN203479642 U CN 203479642U
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Abstract
The utility model discloses a shear test piece for research of viscoelastic material type II fracture under a high strain rate condition. One end of a cylinder is provided with a radial through groove, the other end is provided with a radial through boss, the diameter and the height of the cylinder are less than or equal to the diameter of a test-use Hopkinson bar, the radial through groove and the radial through boss are parallel, the end face of the radial through boss and the bottom face of the radial through groove are equal in area, and the area is half of the area of the cross section of the cylinder; preset cracks are set along the side end face direction of the radial through groove from two ends of the radial through groove; and the shear test piece is simple in structure, meets the requirements of wave propagation in a test piece and a calculation method, can be used for research of mechanics characteristics of metal, brittle and viscoelastic materials in a Hopkinson pressure bar and quasi-static experiment, and makes test results comparable.
Description
Technical field
The utility model belongs to material properties test field, particularly under a kind of high rate of strain condition, studies the shear test block of viscoelastic material II type fracture.
Background technology
Because material mechanical performance research under static state or quasistatic condition can not meet the mechanical property that material shows out under various working environments, Hopkinson first proposed Hopkinson pressure bar for research material the mechanical response under high rate of strain stress condition, dynamic mechanical behavior in order to research material under high rate of strain and mathematical model-MATERIALS ' DYNAMIC constitutive relation thereof start, SHPB(split hopkinson bar) two basic assumptions are just proposed: 1, in bar, one-dimensional stress ripple is supposed; 2, short test specimen stress/strain is uniformly distributed hypothesis along its length.
This experimental provision has been widely applied to and has studied the mechanical property of various materials under striking experiment condition at present.Due to the singularity of experimental provision, from size and dimension many-side, test specimen has been made to restriction, especially II type shear test block, will meet simultaneously and can ignore inertia effects and form shearing force.More existing II type shear test blocks also go for experimental provision, and still, these test specimens are only limited to the hard brittle material of most of metal, for viscoelastic material, in processing and process of the test, are all inapplicable.
Summary of the invention
The purpose of this utility model is to provide a kind of II type fracture property of hard brittle material under quasistatic and high rate of strain that both can be used for studying, again can be for studying the shear test block of the II type fracture property of viscoelastic material under quasistatic and high rate of strain.
The technical solution that realizes the utility model object is:
Under a kind of high rate of strain condition, study the shear test block of viscoelastic material II type fracture, cylindrical one end is provided with radially runs through groove, the other end is provided with and radially runs through boss, cylindrical diameter and the high diameter of testing with Hopkinson bar that is less than or equal to, radially run through groove and radially to run through boss parallel, radially run through the end face of boss and equate with the base area that radially runs through groove, and be half of cylindrical cross-section area; The side end face direction that groove is radially run through at the two ends of radially running through groove arranges precrack.
The utility model compared with prior art, its remarkable advantage:
The utility model structure is comparatively simple, has met the propagation of ripple in test specimen and the requirement of computing method; Can use this test specimen research metal, fragility and the mechanical characteristic of viscoelastic material in Hopkinson pressure bar and quasi-static experiment, make experimental result there is comparability.
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.
Embodiment
In conjunction with Fig. 1:
The utility model discloses the shear test block of studying the fracture of viscoelastic material II type under a kind of high rate of strain condition, one end of right cylinder 1 is provided with radially runs through groove 3, the other end is provided with and radially runs through boss 2, the diameter of right cylinder 1 and the high diameter of testing with Hopkinson bar that is less than or equal to, radially run through groove 3 and radially to run through boss 2 parallel, radially run through the end face of boss 2 and equate with the base area that radially runs through groove 3, and be half of cylindrical cross-section area; The side end face direction that groove 3 is radially run through at the two ends of radially running through groove 3 arranges precrack 5.
Precrack 5 is less than 1/3 of test specimen length in the axial length of test specimen.
First test material is processed into diameter and high equal right cylinder, make cylindrical diameter and the high diameter that is all less than or equal to Hopkinson pressure bar experiment device bar, inertia effect is just negligible on the impact of experiment like this, then on milling machine, process parallel and run through boss and groove radially, finally, at the both sides of groove processing precrack 5, test specimen just machines like this.
In test, incident bar makes incident wave import test specimen into from incident bar with the surface of contact 4 of tight shear test block; The surface of contact 6 with tight shear test block by transmission bar, makes ripple import transmission bar into from test specimen again; Final ripple is absorbed bar and absorbs.In the design process of tight shear test block, we process incident bar with the area of the area of the surface of contact 4 of tight shear test block and the surface of contact 6 of transmission bar and tight shear test block identical, thereby make when test specimen is during in dynamic force balanced, the stress distribution at test specimen two ends also identical be incident wave and reflection wave and equal transmitted wave, met the requirement of Hopkinson pressure bar to test specimen.
This test specimen can be used for the experiment under high rate of strain and quasistatic condition of metal, fragility and viscoelastic material simultaneously.
Claims (2)
1. under one kind high rate of strain condition, study the shear test block of viscoelastic material II type fracture, it is characterized in that: one end of right cylinder (1) is provided with radially runs through groove (3), the other end is provided with and radially runs through boss (2), the diameter of right cylinder (1) and the high diameter of testing with Hopkinson bar that is less than or equal to, radially run through groove (3) and radially to run through boss (2) parallel, the end face that radially runs through boss (2) equates with the base area that radially runs through groove (3), and is cylindrical cross-section area half; The side end face direction that groove (3) is radially run through at the two ends of radially running through groove (3) arranges precrack (5).
2. the shear test block of studying the fracture of viscoelastic material II type under a kind of high rate of strain condition according to claim 1, is characterized in that: described precrack (5) is less than 1/3 of test specimen length in the axial length of test specimen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320532760.8U CN203479642U (en) | 2013-08-29 | 2013-08-29 | Shear test piece for research of viscoelastic material type II fracture under high strain rate condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201320532760.8U CN203479642U (en) | 2013-08-29 | 2013-08-29 | Shear test piece for research of viscoelastic material type II fracture under high strain rate condition |
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| Publication Number | Publication Date |
|---|---|
| CN203479642U true CN203479642U (en) | 2014-03-12 |
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| CN201320532760.8U Withdrawn - After Issue CN203479642U (en) | 2013-08-29 | 2013-08-29 | Shear test piece for research of viscoelastic material type II fracture under high strain rate condition |
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| CN (1) | CN203479642U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439197A (en) * | 2013-08-29 | 2013-12-11 | 南京理工大学 | Shearing test piece for researching type II fracture of viscoelastic material under condition of high strain rate |
| CN107884271A (en) * | 2017-11-15 | 2018-04-06 | 河南理工大学 | Drawing converter and punching drawing test method are rushed in rock dynamic direct tensile test |
| CN114112731A (en) * | 2021-09-03 | 2022-03-01 | 北京理工大学 | Sample suitable for dynamic compression shear mechanical property research of explosive welding material |
-
2013
- 2013-08-29 CN CN201320532760.8U patent/CN203479642U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439197A (en) * | 2013-08-29 | 2013-12-11 | 南京理工大学 | Shearing test piece for researching type II fracture of viscoelastic material under condition of high strain rate |
| CN107884271A (en) * | 2017-11-15 | 2018-04-06 | 河南理工大学 | Drawing converter and punching drawing test method are rushed in rock dynamic direct tensile test |
| CN107884271B (en) * | 2017-11-15 | 2023-09-12 | 河南理工大学 | Impact-pulling converter for rock dynamic direct tensile test and impact-pulling test method |
| CN114112731A (en) * | 2021-09-03 | 2022-03-01 | 北京理工大学 | Sample suitable for dynamic compression shear mechanical property research of explosive welding material |
| CN114112731B (en) * | 2021-09-03 | 2023-10-27 | 北京理工大学 | Sample suitable for research on dynamic compression shearing mechanical properties of explosive welding materials |
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| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20150819 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20150819 |
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| RGAV | Abandon patent right to avoid regrant |