CN108844814A - A kind of braid material Hopkinson tension test clamp method - Google Patents
A kind of braid material Hopkinson tension test clamp method Download PDFInfo
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- CN108844814A CN108844814A CN201810958558.9A CN201810958558A CN108844814A CN 108844814 A CN108844814 A CN 108844814A CN 201810958558 A CN201810958558 A CN 201810958558A CN 108844814 A CN108844814 A CN 108844814A
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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
- G01N3/04—Chucks
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Abstract
The invention discloses a kind of braid material Hopkinson tension test clamp methods, by screwing, outer-hexagonal bolt promotes to compress piece and test specimen is in close contact, and outer-hexagonal bolt is twisted tighter, it is bigger to the clamping force of test specimen to compress piece, so that generating enough frictional force between test specimen and compression piece during Hopkinson tension test, guarantee is not slid therebetween；After test specimen clamping, the first tapered portion and outer-hexagonal bolt for compressing piece are in close contact, the second tapered portion and incident bar or transmission bar for compressing piece are in close contact, so that sliding will not be generated by being compressed between piece and outer-hexagonal bolt and incident bar or transmission bar during the test, to ensure that the validity and accuracy of the test result of test.In addition, the present invention is by screwing clamping of the outer-hexagonal bolt realization to braided fabric test specimen, and it is easy to operate, quick, the test efficiency of braid material Hopkinson tension test can be greatly improved.
Description
Technical field
The present invention relates to a kind of tensile sample clamp methods, and in particular to a kind of braid material Hopkinson stretching examination
It tests and uses clamp method.
Background technique
Currently, the high strain rate tensile test of material generallys use dynamic Hopkinson tension test technology, for metal
Equal hard materials, tension test specimen and the connection method of Hopkinson bar have threaded connection, pin the methods of to connect.Such as patent
" a kind of side for overcoming Hopkinson pull rod test middle plate strip test specimen and rod piece Relative sliding disclosed in ZL201410495098.2
Method ", in the center opening perpendicular to fluting direction, utilizes pin and Hopkinson by slotting on Hopkinson pull rod
The self-locking function of bar is attached, and this method can effectively avoid that Relative sliding occurs between lath test specimen and rod piece, it is ensured that
The validity of test result, and on the basis of ensuring Hopkinson pull rod test result accuracy, test can be greatly improved
Efficiency.
And dynamic Hopkinson tension test is carried out for soft materials such as braided fabrics, during high-speed stretch, how
Guarantee that Relative sliding does not occur between the holding portion and Hopkinson pull rod of test specimen and can guarantee that the deformation of test specimen occurs
It is the problem for needing to solve first in the intermediate live part of test specimen.According to the pin connection type clamping of laths of metal test specimen
Braid material easily causes braided fabric test specimen to destroy in pin junction, causes test result inaccurate.According to existing text
Offer information, some scholars use a kind of switch fixture, by braided fabric test specimen and switch fixture with gluing knot it is good after, then turn
Fixture is changed to connect with Hopkinson bar.The drawbacks of this connection type is：Cementation solidifying needs the regular hour, and test
Need to process more switch fixture in the process meet experiment quantity requirement.
Summary of the invention
The technical problem to be solved by the present invention is to：In view of the deficiencies of the prior art, a kind of braid material is provided
Hopkinson tension test clamp method, the clamp method are easy to operate, quick, it is ensured that Hopkinson tension test
The validity and accuracy of test result, and greatly improve the test efficiency of braid material Hopkinson tension test.
The present invention solves technical solution used by above-mentioned technical problem：A kind of braid material Hopkinson stretching
Test clamp method, includes the following steps：
（1）Prepare the cylindrical identical incident bar semi-finished product of outer diameter, transmission bar semi-finished product, and prepare two compressions pieces partly at
Product；
（2）The first bellmouth and the first internal screw thread communicated is processed along its axial direction in one end of the incident bar semi-finished product
Hole, first internal thread hole are arranged in the front side of first bellmouth, first bellmouth close to described
The first internal thread hole one end aperture be greater than its other end aperture, the incident bar semi-finished product the other end process
External threads obtain incident bar, are provided in matching with the external screw thread on the impact block of Hopkinson pull rod experimental rig
Screw thread；
（3）The second bellmouth and the second internal screw thread communicated is processed along its axial direction in one end of the transmission bar semi-finished product
Hole, second bellmouth is identical as the shape size of the first bellmouth, second internal thread hole with it is described
The first internal thread hole shape size it is identical, the front side of second bellmouth is arranged in second internal thread hole,
The aperture of one end close to second internal thread hole of second bellmouth is greater than the aperture of its other end, obtains
Penetrate bar；
（4）Compression piece semi-finished product include the cylindrical portion being wholely set, the first tapered portion and the second tapered portion described in every, described
Cylindrical portion be connected with the narrow end of first tapered portion, the wide end of first tapered portion and second tapered portion
Wide end be connected, second tapered portion is adapted with first bellmouth and second bellmouth respectively, with
Plane by the axis of the compression piece semi-finished product described in every is divisional plane, respectively by compression piece semi-finished product described in two point
It cuts, obtains four compression pieces；
（5）Prepare two outer-hexagonal bolts, the head of each outer-hexagonal bolt offers axially extending bore, the cylinder
Portion is adapted with the axially extending bore, the screw rod of the outer-hexagonal bolt respectively with first internal thread hole and
Second internal thread hole is adapted, and offers conical through-hole, the cone in the screw rod of each outer-hexagonal bolt
Shape through-hole is coaxially disposed and communicates with the axially extending bore, one end close to the axially extending bore of the conical through-hole
Aperture be less than the aperture of its other end, first tapered portion is adapted with the conical through-hole；
（6）Prepare the suitable braided fabric test specimen of size, the incident bar and the transmission bar are separately mounted to
On Hopkinson pull rod experimental rig, connect the impact block screw thread of the incident bar and Hopkinson pull rod experimental rig
It connects；
（7）It takes two panels to compress piece, is overlapped its divisional plane, then the two panels of an outer-hexagonal bolt sleeve after overlapping is compressed into piece
On, make that the first tapered portion is located in the conical through-hole of the outer-hexagonal bolt and cylindrical portion is worn from the axially extending bore of the outer-hexagonal bolt
Out, the two panels is filled in from cylindrical portion in one end of braided fabric test specimen to compress between piece, the screw rod of the outer-hexagonal bolt is slowly revolved
Enter in the first internal thread hole on the incident bar, is bonded the first tapered portion gradually with conical through-hole, while the second taper
Portion is gradually bonded with the first bellmouth, is closely compressed until one end of braided fabric test specimen compresses piece by two panels；
（8）It takes another two panels to compress piece, is overlapped its divisional plane, then the two panels pressure by another outer-hexagonal bolt sleeve after overlapping
Tight on piece, makes that the first tapered portion is located in the conical through-hole of the outer-hexagonal bolt and cylindrical portion is logical from the axial direction of the outer-hexagonal bolt
Hole is pierced by, and the other end of braided fabric test specimen is filled in the two panels from cylindrical portion and is compressed between piece, by the screw rod of the outer-hexagonal bolt
It slowly screws in the second internal thread hole on the transmission bar, is bonded the first tapered portion gradually with conical through-hole, while the
Two tapered portion are gradually bonded with the second bellmouth, are closely compressed until the other end of braided fabric test specimen compresses piece by another two panels, i.e.,
Complete the clamping to braided fabric test specimen.
Preferably, the salient point of annular knurl or multiple intervals is provided on the divisional plane of compression piece described in every, to increase
Contact area and frictional force after braided fabric test specimen clamping between compression piece, it is ensured that the secured clamping to braided fabric test specimen, into
The validity and accuracy of one step guarantee test result.
Compared with the prior art, the advantages of the present invention are as follows：Braid material Hopkinson disclosed by the invention stretches examination
It tests and uses clamp method, corresponding working process has been carried out to incident bar and transmission bar, and machined four with specific structure
Piece and two outer-hexagonal bolts are compressed, during braided fabric test specimen is installed, promote to compress piece by screwing outer-hexagonal bolt
It is in close contact with test specimen, and outer-hexagonal bolt is twisted tighter, compression piece is bigger to the clamping force of test specimen, so that in Hopkinson
Enough frictional force is generated during tension test between test specimen and compression piece, guarantee does not slide therebetween；Test specimen dress
After folder, the first tapered portion and outer-hexagonal bolt for compressing piece are in close contact, and compress the second tapered portion and incident bar or transmission of piece
Bar is in close contact so that compressed during Hopkinson tension test piece and outer-hexagonal bolt and incident bar or transmission bar it
Between will not generate sliding, to ensure that the validity and accuracy of the test result of Hopkinson tension test.In addition, this
Invention is easy to operate, quick by screwing clamping of the outer-hexagonal bolt realization to braided fabric test specimen, can greatly improve braided fabric material
Expect the test efficiency of Hopkinson tension test.
Detailed description of the invention
Fig. 1 is the outside drawing of incident bar in embodiment；
Fig. 2 is the outside drawing of transmission bar in embodiment；
Fig. 3 is the front view for the compression piece that two panels is staggered relatively in embodiment；
Fig. 4 is the left view for the compression piece that two panels is staggered relatively in embodiment；
Fig. 5 is the bottom view that piece is compressed in embodiment；
Fig. 6 is the outside drawing of embodiment China and foreign countries hex bolts；
Fig. 7 is the clamp position figure of braided fabric test specimen in embodiment.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
The braid material Hopkinson tension test clamp method of embodiment, includes the following steps：
（1）Prepare the cylindrical identical incident bar semi-finished product of outer diameter, transmission bar semi-finished product, and prepare two compression pieces 3 half at
Product；
（2）The first bellmouth 11 and the first internal thread hole 12 communicated is processed along its axial direction in one end of incident bar semi-finished product,
The front side of the first bellmouth 11, one end close to the first internal thread hole 12 of the first bellmouth 11 is arranged in first internal thread hole 12
Aperture be greater than the aperture of its other end, process external threads 13 in the other end of incident bar semi-finished product, Hopkinson pull rod obtains
To incident bar 1, as shown in Figure 1, the impact block of experimental rig（It is not shown in the figure）On be provided with and match with the external screw thread 13
Internal screw thread；
（3）The second bellmouth 21 and the second internal thread hole 22 communicated is processed along its axial direction in one end of transmission bar semi-finished product,
Second bellmouth 21 is identical as the shape size of the first bellmouth 11, the shape of the second internal thread hole 22 and the first internal thread hole 12
Size is identical, and the front side of the second bellmouth 21, close second internal screw thread of the second bellmouth 21 is arranged in the second internal thread hole 22
The aperture of the one end in hole 22 is greater than the aperture of its other end, obtains transmission bar 2, as shown in Figure 2；
（4）Every compression 3 semi-finished product of piece include the cylindrical portion 31 being wholely set, the first tapered portion 32 and the second tapered portion 33, circle
Column portion 31 is connected with the narrow end of the first tapered portion 32, and the wide end of the first tapered portion 32 is connected with the wide end of the second tapered portion 33, the
Two tapered portion 33 are adapted with the first bellmouth 11 and the second bellmouth 21 respectively, by the axis of every compression 3 semi-finished product of piece
The plane of line is divisional plane, respectively divides two compression 3 semi-finished product of piece, four compression pieces 3 is obtained, as shown in Fig. 3~Fig. 5；
（5）Prepare two outer-hexagonal bolts 4 as shown in FIG. 6, the head 41 of each outer-hexagonal bolt 4 offers axially extending bore
43, cylindrical portion 31 is adapted with axially extending bore 43, the screw rod 42 of each outer-hexagonal bolt 4 respectively with the first internal thread hole 12 and
Two internal thread holes 22 are adapted, and conical through-hole 44, conical through-hole 44 and axial direction are offered in the screw rod 42 of each outer-hexagonal bolt 4
Through-hole 43 is coaxially disposed and communicates, and the aperture of one end of the close axially extending bore 43 of conical through-hole 44 is less than the hole of its other end
Diameter, the first tapered portion 32 are adapted with conical through-hole 44；
（6）Prepare the suitable braided fabric test specimen 5 of size, incident bar 1 and transmission bar 2 are separately mounted to the examination of Hopkinson pull rod
On experiment device, it is threadedly coupled incident bar 1 and the impact block of Hopkinson pull rod experimental rig；
（7）It takes two panels to compress piece 3, is overlapped its divisional plane, then one 4 sets of outer-hexagonal bolt two panels after overlapping are compressed
On piece 3, make that the first tapered portion 32 is located in the conical through-hole 44 of the outer-hexagonal bolt 4 and cylindrical portion 31 is from the outer-hexagonal bolt 4
Axially extending bore 43 be pierced by, by one end of braided fabric test specimen 5 from cylindrical portion 31 fill in the two panels compress piece 3 between, by this outer six
The screw rod 42 of corner bolt 4 slowly screws in the first internal thread hole 12 on incident bar 1, makes the first tapered portion 32 and conical through-hole 44
It is gradually bonded, while the second tapered portion 33 is gradually bonded with the first bellmouth 11, until one end of braided fabric test specimen 5 is by two panels pressure
Tight piece 3 closely compresses；
（8）It takes another two panels to compress piece 3, is overlapped its divisional plane, then by 4 sets of another outer-hexagonal bolt two panels after overlapping
Compress on piece 3, make the first tapered portion 32 be located at the outer-hexagonal bolt 4 conical through-hole 44 is interior and cylindrical portion 31 is from the outer-hexagonal spiral shell
The axially extending bore 43 of bolt 4 is pierced by, and the other end of braided fabric test specimen 5 is filled in the two panels from cylindrical portion 31 and is compressed between piece 3, by this
The screw rod 42 of outer-hexagonal bolt 4 slowly screws in the second internal thread hole 22 on transmission bar 2, keeps the first tapered portion 32 and taper logical
Hole 44 is gradually bonded, while the second tapered portion 33 is gradually bonded with the second bellmouth 21, until the other end quilt of braided fabric test specimen 5
Another two panels compresses piece 3 and closely compresses, that is, completes the clamping to braided fabric test specimen 5, as shown in Figure 7.
In the present embodiment, the salient point 34 at multiple intervals is provided on the divisional plane of every compression piece 3.In practical applications,
Annular knurl is set on the divisional plane that piece 3 can also be compressed at every, with increase after 5 clamping of braided fabric test specimen compress between piece 3
Contact area and frictional force.
Claims (2)
1. a kind of braid material Hopkinson tension test clamp method, it is characterised in that include the following steps：
（1）Prepare the cylindrical identical incident bar semi-finished product of outer diameter, transmission bar semi-finished product, and prepare two compressions pieces partly at
Product；
（2）The first bellmouth and the first internal screw thread communicated is processed along its axial direction in one end of the incident bar semi-finished product
Hole, first internal thread hole are arranged in the front side of first bellmouth, first bellmouth close to described
The first internal thread hole one end aperture be greater than its other end aperture, the incident bar semi-finished product the other end process
External threads obtain incident bar, are provided in matching with the external screw thread on the impact block of Hopkinson pull rod experimental rig
Screw thread；
（3）The second bellmouth and the second internal screw thread communicated is processed along its axial direction in one end of the transmission bar semi-finished product
Hole, second bellmouth is identical as the shape size of the first bellmouth, second internal thread hole with it is described
The first internal thread hole shape size it is identical, the front side of second bellmouth is arranged in second internal thread hole,
The aperture of one end close to second internal thread hole of second bellmouth is greater than the aperture of its other end, obtains
Penetrate bar；
（4）Compression piece semi-finished product include the cylindrical portion being wholely set, the first tapered portion and the second tapered portion described in every, described
Cylindrical portion be connected with the narrow end of first tapered portion, the wide end of first tapered portion and second tapered portion
Wide end be connected, second tapered portion is adapted with first bellmouth and second bellmouth respectively, with
Plane by the axis of the compression piece semi-finished product described in every is divisional plane, respectively by compression piece semi-finished product described in two point
It cuts, obtains four compression pieces；
（5）Prepare two outer-hexagonal bolts, the head of each outer-hexagonal bolt offers axially extending bore, the cylinder
Portion is adapted with the axially extending bore, the screw rod of the outer-hexagonal bolt respectively with first internal thread hole and
Second internal thread hole is adapted, and offers conical through-hole, the cone in the screw rod of each outer-hexagonal bolt
Shape through-hole is coaxially disposed and communicates with the axially extending bore, one end close to the axially extending bore of the conical through-hole
Aperture be less than the aperture of its other end, first tapered portion is adapted with the conical through-hole；
（6）Prepare the suitable braided fabric test specimen of size, the incident bar and the transmission bar are separately mounted to
On Hopkinson pull rod experimental rig, connect the impact block screw thread of the incident bar and Hopkinson pull rod experimental rig
It connects；
（7）It takes two panels to compress piece, is overlapped its divisional plane, then the two panels of an outer-hexagonal bolt sleeve after overlapping is compressed into piece
On, make that the first tapered portion is located in the conical through-hole of the outer-hexagonal bolt and cylindrical portion is worn from the axially extending bore of the outer-hexagonal bolt
Out, the two panels is filled in from cylindrical portion in one end of braided fabric test specimen to compress between piece, the screw rod of the outer-hexagonal bolt is slowly revolved
Enter in the first internal thread hole on the incident bar, is bonded the first tapered portion gradually with conical through-hole, while the second taper
Portion is gradually bonded with the first bellmouth, is closely compressed until one end of braided fabric test specimen compresses piece by two panels；
（8）It takes another two panels to compress piece, is overlapped its divisional plane, then the two panels pressure by another outer-hexagonal bolt sleeve after overlapping
Tight on piece, makes that the first tapered portion is located in the conical through-hole of the outer-hexagonal bolt and cylindrical portion is logical from the axial direction of the outer-hexagonal bolt
Hole is pierced by, and the other end of braided fabric test specimen is filled in the two panels from cylindrical portion and is compressed between piece, by the screw rod of the outer-hexagonal bolt
It slowly screws in the second internal thread hole on the transmission bar, is bonded the first tapered portion gradually with conical through-hole, while the
Two tapered portion are gradually bonded with the second bellmouth, are closely compressed until the other end of braided fabric test specimen compresses piece by another two panels, i.e.,
Complete the clamping to braided fabric test specimen.
2. a kind of braid material Hopkinson tension test clamp method according to claim 1, it is characterised in that
The salient point that annular knurl or multiple intervals are provided on the divisional plane of piece is compressed described in every.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810958558.9A CN108844814A (en) | 2018-08-22 | 2018-08-22 | A kind of braid material Hopkinson tension test clamp method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810958558.9A CN108844814A (en) | 2018-08-22 | 2018-08-22 | A kind of braid material Hopkinson tension test clamp method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108844814A true CN108844814A (en) | 2018-11-20 |
Family
ID=64188557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810958558.9A Pending CN108844814A (en) | 2018-08-22 | 2018-08-22 | A kind of braid material Hopkinson tension test clamp method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108844814A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261252A (en) * | 2019-06-14 | 2019-09-20 | 武汉理工大学 | Hopkinson pressure bar experiment transmission bar and Hopkinson pressure bar experiment device |
| CN113237740A (en) * | 2021-05-08 | 2021-08-10 | 西北工业大学 | Clamping mechanism, device and method for Hopkinson bar stretching experiment of biological soft material |
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| CN1262436A (en) * | 1999-01-27 | 2000-08-09 | 北京理工大学 | Fixture for dynamic stretching test of fibre reinforced compound material |
| CN202562808U (en) * | 2012-05-07 | 2012-11-28 | 长春新试验机有限责任公司 | Sample prestress clamping device |
| CN104266903A (en) * | 2014-09-24 | 2015-01-07 | 宁波大学 | Method for overcoming relative slippage of strip test piece and rod piece in Hopkinson drawing bar test |
| CN104897461A (en) * | 2015-06-16 | 2015-09-09 | 南京理工大学 | Dynamic tension experiment fixture |
| KR101727405B1 (en) * | 2015-10-28 | 2017-05-02 | 전북대학교산학협력단 | Modification of Hoek triaxial cell for SHPB tests and its application to dynamic shear strength measurement of brittle materials |
| CN207439808U (en) * | 2017-10-20 | 2018-06-01 | 昆明理工大学 | A kind of multi-functional mechanical stretch laboratory holder |
-
2018
- 2018-08-22 CN CN201810958558.9A patent/CN108844814A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1262436A (en) * | 1999-01-27 | 2000-08-09 | 北京理工大学 | Fixture for dynamic stretching test of fibre reinforced compound material |
| CN202562808U (en) * | 2012-05-07 | 2012-11-28 | 长春新试验机有限责任公司 | Sample prestress clamping device |
| CN104266903A (en) * | 2014-09-24 | 2015-01-07 | 宁波大学 | Method for overcoming relative slippage of strip test piece and rod piece in Hopkinson drawing bar test |
| CN104897461A (en) * | 2015-06-16 | 2015-09-09 | 南京理工大学 | Dynamic tension experiment fixture |
| KR101727405B1 (en) * | 2015-10-28 | 2017-05-02 | 전북대학교산학협력단 | Modification of Hoek triaxial cell for SHPB tests and its application to dynamic shear strength measurement of brittle materials |
| CN207439808U (en) * | 2017-10-20 | 2018-06-01 | 昆明理工大学 | A kind of multi-functional mechanical stretch laboratory holder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261252A (en) * | 2019-06-14 | 2019-09-20 | 武汉理工大学 | Hopkinson pressure bar experiment transmission bar and Hopkinson pressure bar experiment device |
| CN110261252B (en) * | 2019-06-14 | 2021-09-03 | 武汉理工大学 | Transmission rod for Hopkinson pressure bar experiment and Hopkinson pressure bar experiment device |
| CN113237740A (en) * | 2021-05-08 | 2021-08-10 | 西北工业大学 | Clamping mechanism, device and method for Hopkinson bar stretching experiment of biological soft material |
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