CN204142561U - A kind of Hopkinson pull rod being applicable to lath test specimen - Google Patents
A kind of Hopkinson pull rod being applicable to lath test specimen Download PDFInfo
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- CN204142561U CN204142561U CN201420553661.2U CN201420553661U CN204142561U CN 204142561 U CN204142561 U CN 204142561U CN 201420553661 U CN201420553661 U CN 201420553661U CN 204142561 U CN204142561 U CN 204142561U
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- radial groove
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Abstract
Utility model discloses a kind of Hopkinson pull rod being applicable to lath test specimen, comprises columniform incident bar and transmission bar, and the radial direction along incident bar offers radial groove, radial direction through hole and the screw mounting hole for installing attachment screw.The utility model is coordinated by attachment screw and radial groove and lath test specimen; finally can realize lath test specimen to contact with seamless between attachment screw; simultaneously in conjunction with the first compressed part and friction force larger between the second compressed part and lath test specimen; effectively can avoid lath test specimen and between incident bar and transmission bar, Relative sliding occur; the validity of warranty test result; and on the basis of guaranteeing Hopkinson impact tension test result accuracy, significantly can improve test efficiency.
Description
Technical field
The utility model relates to Hopkinson impact tension test pull bar used, specifically a kind of Hopkinson pull rod being applicable to lath test specimen.
Background technology
At present, Chinese scholars generally adopts the dynamic tensile mechanical property of separate type Hopkinson pull rod test unit research material under different strain rate.The pull bar of Hopkinson pull rod test unit comprises columniform incident bar and transmission bar, is fixedly connected with respectively at the two ends of tensile test specimen during test with incident bar with transmission bar.Hopkinson tensile test specimen is generally cylindrical or lath-shaped.For cylindrical Hopkinson tensile test specimen, Hopkinson pull rod and test specimen are threaded connection, generally be reserved with internal thread in the end of Hopkinson pull rod, be processed with external thread at the two ends of test specimen, coordinate by the external thread at test specimen two ends and the internal thread of Hopkinson pull rod end the connection realizing Hopkinson pull rod and test specimen.For the connection of lath-shaped test specimen and Hopkinson pull rod, the following form of current domestic main employing: increase a cylindrical fixture between, one end of this fixture adopts the internal thread of external thread and Hopkinson pull rod to be threaded, the other end adopts cutting and fitted bolt is connected with lath-shaped test specimen, coordinates tackifier that test specimen and fixture are bonded together simultaneously.Lath-shaped test specimen is connected with Hopkinson pull rod there is certain defect by increasing fixture, it shows as: for the connection between fixture and Hopkinson pull rod, therebetween certain gap is also there is in the external thread of fixture after being connected with the internal thread of pull bar, in Hopkinson tension test, this gap can be caused between Hopkinson pull rod and fixture and Relative sliding is occurred; In addition, for arranging cutting and fitted bolt web joint strip test specimen on fixture, between bolt and the bolt hole of test specimen and between test specimen and cutting face, no matter whether bolt has screwed gap exists, in Hopkinson tension test, can cause between test specimen and fixture and slippage occurs, and can there is local nonaffine deformation in the bolt hole pressure-bearing surface of test specimen, make the circular bolt holes of test specimen become elliptical aperture.The local nonaffine deformation of these Relative sliding and test specimen bolt hole, all can cause in process of the test the data distortion measured and obtain above, causes test findings inaccurate.Although after coating cementing agent between test specimen and scored surface the two be bonded together, the problem of Relative sliding therebetween and the local nonaffine deformation of test specimen bolt hole can be solved to a certain extent, but, the gluing process of tackifier is comparatively loaded down with trivial details, consuming time, after gluing, the solidification of tackifier also needs the regular hour, and again need during test first the tackifier carving in-tank-solidification to be removed, also need to expend the long period, therefore existing by increasing the mode that lath-shaped test specimen is connected with Hopkinson pull rod by fixture, affect the test efficiency of Hopkinson impact tension test.
Summary of the invention
Technical problem to be solved in the utility model is: for the deficiencies in the prior art; a kind of Hopkinson pull rod being applicable to lath test specimen is provided; this Hopkinson pull rod, on the basis of guaranteeing Hopkinson impact tension test result accuracy, significantly can improve test efficiency.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of Hopkinson pull rod being applicable to lath test specimen, comprise columniform incident bar and transmission bar, described incident bar is identical with the diameter of described transmission bar, radial direction along described incident bar offers radial groove, radial direction through hole and the screw mounting hole for installing attachment screw, described radial groove is arranged on one end of described incident bar, described radial direction through hole is positioned at the bottom of described radial groove, described screw mounting hole is vertical with described radial groove, described radial groove and described radial direction through hole are conducted, the aperture of described radial direction through hole is greater than the height of described radial groove, the center line of radial groove on the shaft section vertical with radial groove of incident bar, the mid point of radial direction through hole and the center line of incident bar are on same straight line, thus an end of incident bar is divided into the first compressed part and the second compressed part by radial groove and radial direction through hole, described screw mounting hole comprises the circular hole of central shaft on same straight line and threaded hole, described circular hole is opened in the middle part of the first described compressed part, described threaded hole is opened in the middle part of the second described compressed part, the aperture of described circular hole is greater than the aperture of described threaded hole, described attachment screw comprises the head of screw connecting setting successively, cylindrical portion, variable cross section portion and threaded portion, the external diameter of described cylindrical portion is identical with the aperture of described circular hole, the length sum in described cylindrical portion and described variable cross section portion is greater than the degree of depth of described circular hole, threaded hole in described threaded portion and the second described compressed part is suitable, the other end of described incident bar is provided with internal thread, described transmission bar is identical with the structure of described incident bar, and difference is, the other end of described transmission bar does not arrange internal thread.
Offer the connecting hole corresponding with screw mounting hole at the two ends of lath test specimen before test, the aperture of this connecting hole is identical with the pore size of threaded hole.The end of lath test specimen loads radial groove and after attachment screw is installed on screw mounting hole, screw attachment screw, owing to being provided with radial direction through hole in the bottom of radial groove, and the aperture of radial direction through hole is greater than the height of radial groove, therefore radial groove inwardly can slowly shrink from its opening, make the first compressed part and the second compressed part be adjacent to lath test specimen gradually, thus lath test specimen and the friction force between incident bar and transmission bar increase, lath test specimen can be fixedly connected on incident bar and transmission bar.In addition, attachment screw adopts the transition of variable cross section portion, screw attachment screw, this variable cross section portion can through lath test specimen and connecting hole on extruded strip test specimen, make connecting hole that the plastic yield of local occur, the yield strength at this generation plastic yield position on lath test specimen is improved, thus makes this portion of material not easily local deformation occur in process of the test, and ensure that test specimen contacts with the seamless of screw.Therefore, the utility model is coordinated by attachment screw and radial groove and lath test specimen, finally can realize lath test specimen to contact with seamless between attachment screw, simultaneously in conjunction with the first compressed part and friction force larger between the second compressed part and lath test specimen, effectively can avoid lath test specimen and between incident bar and transmission bar, Relative sliding occur, the validity of warranty test result.
As preferably, the ratio of the pore size of described radial direction through hole and the height size of described radial groove is 1 ~ 5:1, when screwing attachment screw like this, radial groove easily shrinks, and ensure that the collapsible scope of its suitable amplitude, tension test when making lath specimen thickness less is solved.
As preferred further, the depth size of described radial groove is 2 ~ 3 times of the diameter of described incident bar, lath test specimen and the contact area between incident bar and transmission bar can be increased, increasing friction force, make the connection of lath test specimen and incident bar and transmission bar more firm.
Compared with prior art, the utility model has the advantage of: the Hopkinson pull rod being applicable to lath test specimen disclosed in the utility model, by coordinating of attachment screw and radial groove and lath test specimen, finally can realize lath test specimen to contact with seamless between attachment screw, simultaneously in conjunction with the first compressed part and friction force larger between the second compressed part and lath test specimen, effectively can avoid lath test specimen and between incident bar and transmission bar, Relative sliding occur, the validity of warranty test result, and on the basis of guaranteeing Hopkinson impact tension test result accuracy, significantly can improve test efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of incident bar in embodiment;
Fig. 2 is the structural representation of transmission bar in embodiment;
Fig. 3 is the outside drawing of attachment screw in embodiment;
Fig. 4 is the outside drawing of embodiment middle plate strip test specimen.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
As shown in the figure, a kind of Hopkinson pull rod being applicable to lath test specimen, comprise incident bar 1 and transmission bar 2 that columniform diameter is Ф 19mm, radial direction along incident bar 1 offers the radial groove 11 that the degree of depth is 50mm, aperture is the radial direction through hole 12 of Ф 3mm and the screw mounting hole 13 for installing attachment screw 3, the height of radial groove 11 is 1.2mm, radial groove 11 is arranged on one end of incident bar 1, radial direction through hole 12 is positioned at the bottom of radial groove 11, screw mounting hole 13 is vertical with radial groove 11, radial groove 11 and radial direction through hole 12 are conducted, the center line of radial groove 11 on the shaft section vertical with radial groove 11 of incident bar 1, the mid point of radial direction through hole 12 and the center line of incident bar 1 are on same straight line, thus an end of incident bar 1 is divided into the first compressed part 14 and the second compressed part 15 by radial groove 11 and radial direction through hole 12, it is Ф 8.5mm that screw mounting hole 13 comprises the aperture of central shaft on same straight line, the degree of depth is the circular hole 16 of 8.9mm and the threaded hole 17 of M8, circular hole 16 is opened in the middle part of the first compressed part 14, threaded hole 17 is opened in the middle part of the second compressed part 15, attachment screw 3 comprises the head of screw 31 connecting setting successively, cylindrical portion 32, the threaded portion 34 of variable cross section portion 33 and M8, the external diameter of cylindrical portion 32 is Ф 8.5mm, the length of cylindrical portion 32 is 8.5mm, the length in variable cross section portion 33 is 2mm, the other end of incident bar 1 is provided with the internal thread 18 of M19*1.5, for connecting the impact block of (not shown) on Hopkinson pull rod test unit, transmission bar 2 is identical with the structure of incident bar 1, and difference is, the other end of transmission bar 2 does not arrange internal thread.
Offer two connecting holes 41 corresponding with the screw mounting hole on incident bar 1 and transmission bar 2 at the two ends of lath test specimen 4 before test, as shown in Figure 4, the aperture of this connection 41 is Ф 8mm.The end of lath test specimen 4 loads radial groove and after attachment screw is installed on screw mounting hole, screw attachment screw, lath test specimen 4 can be fixedly connected on incident bar 1 and transmission bar 4, owing to being provided with radial direction through hole in the bottom of radial groove, and the aperture of radial direction through hole is greater than the height of radial groove, therefore radial groove inwardly can slowly shrink from its opening, the first compressed part and the second compressed part is made to be adjacent to lath test specimen 4 gradually, ensure lath test specimen 4 and have enough large friction force between incident bar 1 and transmission bar 2, in addition, variable cross section portion while radial groove shrinks on attachment screw is through the connecting hole 41 on lath test specimen 4 extruded strip test specimen 4, can to realize between lath test specimen 4 with attachment screw 3 seamless contacts, thus effectively avoid lath test specimen 4 and between incident bar 1 and transmission bar 2, Relative sliding occurs, the validity of warranty test result.
Claims (3)
1. one kind is applicable to the Hopkinson pull rod of lath test specimen, comprise columniform incident bar and transmission bar, described incident bar is identical with the diameter of described transmission bar, it is characterized in that offering radial groove along the radial direction of described incident bar, radial direction through hole and the screw mounting hole for installing attachment screw, described radial groove is arranged on one end of described incident bar, described radial direction through hole is positioned at the bottom of described radial groove, described screw mounting hole is vertical with described radial groove, described radial groove and described radial direction through hole are conducted, the aperture of described radial direction through hole is greater than the height of described radial groove, the center line of radial groove on the shaft section vertical with radial groove of incident bar, the mid point of radial direction through hole and the center line of incident bar are on same straight line, thus an end of incident bar is divided into the first compressed part and the second compressed part by radial groove and radial direction through hole, described screw mounting hole comprises the circular hole of central shaft on same straight line and threaded hole, described circular hole is opened in the middle part of the first described compressed part, described threaded hole is opened in the middle part of the second described compressed part, the aperture of described circular hole is greater than the aperture of described threaded hole, described attachment screw comprises the head of screw connecting setting successively, cylindrical portion, variable cross section portion and threaded portion, the external diameter of described cylindrical portion is identical with the aperture of described circular hole, the length sum in described cylindrical portion and described variable cross section portion is greater than the degree of depth of described circular hole, threaded hole in described threaded portion and the second described compressed part is suitable, the other end of described incident bar is provided with internal thread, described transmission bar is identical with the structure of described incident bar, and difference is, the other end of described transmission bar does not arrange internal thread.
2. a kind of Hopkinson pull rod being applicable to lath test specimen according to claim 1, is characterized in that the ratio of the pore size of described radial direction through hole and the height size of described radial groove is 1 ~ 5:1.
3. a kind of Hopkinson pull rod being applicable to lath test specimen according to claim 1 and 2, is characterized in that the depth size of described radial groove is 2 ~ 3 times of the diameter of described incident bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420553661.2U CN204142561U (en) | 2014-09-24 | 2014-09-24 | A kind of Hopkinson pull rod being applicable to lath test specimen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420553661.2U CN204142561U (en) | 2014-09-24 | 2014-09-24 | A kind of Hopkinson pull rod being applicable to lath test specimen |
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| Publication Number | Publication Date |
|---|---|
| CN204142561U true CN204142561U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420553661.2U Expired - Fee Related CN204142561U (en) | 2014-09-24 | 2014-09-24 | A kind of Hopkinson pull rod being applicable to lath test specimen |
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| Country | Link |
|---|---|
| CN (1) | CN204142561U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300792A (en) * | 2015-11-18 | 2016-02-03 | 太原理工大学 | Clamping device of Hopkinson pull bar test-piece and experimental method |
| CN105424470A (en) * | 2015-11-18 | 2016-03-23 | 太原理工大学 | Clamping device and experiment method for split Hopkinson torsion bar test piece |
-
2014
- 2014-09-24 CN CN201420553661.2U patent/CN204142561U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300792A (en) * | 2015-11-18 | 2016-02-03 | 太原理工大学 | Clamping device of Hopkinson pull bar test-piece and experimental method |
| CN105424470A (en) * | 2015-11-18 | 2016-03-23 | 太原理工大学 | Clamping device and experiment method for split Hopkinson torsion bar test piece |
| CN105300792B (en) * | 2015-11-18 | 2020-10-23 | 太原理工大学 | Clamping device and experimental method for Hopkinson pull rod test piece |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20170924 |