CN208283177U - UHPC test specimen uniaxial tensile test high-accuracy clamp - Google Patents
UHPC test specimen uniaxial tensile test high-accuracy clamp Download PDFInfo
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- CN208283177U CN208283177U CN201820802412.0U CN201820802412U CN208283177U CN 208283177 U CN208283177 U CN 208283177U CN 201820802412 U CN201820802412 U CN 201820802412U CN 208283177 U CN208283177 U CN 208283177U
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Abstract
The utility model relates to tension clamp arts, a kind of specifically UHPC test specimen uniaxial tensile test high-accuracy clamp, fixture is equipped with the groove to fit with the end shape of UHPC test specimen, the inner end of groove is gripping section, the outer end of groove is positioning section, the side of fixture is equipped with backboard being located at groove location, and clamp ends are additionally provided with the connecting rod for connecting with puller system, and the junction of connecting rod and clamp ends is equipped with ball head device.The utility model compared with the existing technology, the advantage is that: clamp ends are equipped with ball head device, is not only convenient for installing test specimen in fixture, it is often more important that can be to avoid the torsion phenomenon in drawing process；And the groove of fixture is fitted closely with UHPC test specimen, and test specimen stress is more evenly；Fixture is avoided to deform using backboard reinforcement, the backboard is fixed on fixture side using the steel plate with fixture same material, not only can guarantee the compactness of test specimen and fixture, it is often more important that can be deformed under stress to avoid fixture.
Description
Technical field
The utility model relates to tension clamp arts, and specifically a kind of UHPC test specimen uniaxial tensile test is high
Precision fixture.
Background technique
UHPC is a kind of New Style Concrete Materials with superelevation mechanical property and superelevation durability occurred in recent years,
Due to inside, there are the super-fine fiber materials of a large amount of anisotropic elastic solids, in addition under extremely low ratio of mud collective effect, therefore its
Hydrated product is very fine and close, and compression strength may be up to 120 ~ 200MPa, and flexural strength can be more than 30MPa.
The most important performance indicator of UHPC is its excellent tensile property performance, normal concrete tensile strength only has 2 ~
3MPa, according to foreign literature for usual UHPC tensile strength up to 7 ~ 15MPa, more important is its tensions to deform up to 2000 μ ε
More than.
Due to domestic at present temporarily there are no targetedly testing standard and method, the standard that can be used for reference only has a water
Work concrete standard (DL/T5150), wherein having defined to normal concrete uniaxial tensile test method.But it is being answered
In actual test for UHPC test specimen, but there are many problems, such as:
(1) oversized.Since normal concrete tensile property is weaker, specimen cross section is oversized, is 100*
100mm(hereinafter referred to as " big eight word " sample).And UHPC is used usually as thin-wall construction, thickness is only 20 ~ 50mm, therefore should
Sized samples can not actually characterize the real use state of UHPC.
(2) shape is unreasonable.Since the neck of " big eight word " sample is straight line intersection, due to folder in tension test process
The local stress of tool exists, and causes tension to be destroyed and easily occurs at " neck ".
(3) from great.Individually " big eight word " sample weight is up to 15Kg or more, in addition the weight of fixture is even up to
20Kg leads to machine breakdown and personal injury clamping and being easy to generation test specimen in test process to fall off.
(4) there are torsion phenomenon when being uniaxially stretched, actual test result can not really reflect that UHPC material really resists
Draw performance.
In view of the foregoing, the existing concrete for hydraulic structure in this field tension test fixture, since test method itself is deposited
It, still can not although having part R&D institution and producer that improvement is optimized to above-mentioned fixture in certain irrationality
Overcome disadvantages mentioned above, can not objectively characterize the practical tensile property of UHPC, is brought to design and material technology personnel biggish tired
It disturbs.
Summary of the invention
Utility model aims to solve the deficiencies in the prior art, provide a kind of UHPC test specimen uniaxial tensile test use
High-accuracy clamp avoids the problem that stress collection neutralizes discontinuity in tension test, avoids UHPC test specimen from destroying in gripping section.
To achieve the goals above, a kind of UHPC test specimen uniaxial tensile test high-accuracy clamp, the fixture are designed
Equipped with the groove that the end shape with the UHPC test specimen fits, for clamping the UHPC test specimen, the groove
Inner end be gripping section, the outer end of the groove is positioning section, and the diameter of the positioning section is less than the folder
The diameter of section is held, the side of the fixture is being located at equipped with backboard at the groove location, and the clamp ends are also set
There is a connecting rod for connecting with puller system, the junction of the connecting rod and clamp ends is equipped with ball head device.
The utility model also has following preferred technical solution:
The fixture includes upper fixture and lower fixture, and the upper fixture top is equipped with ball head device and connecting rod and institute
The outer end for the groove stated is located at upper fixture bottom end, and the lower fixture bottom end is equipped with ball head device and connecting rod and described recessed
The outer end of slot is located at lower fixture top.
The changeover portion of arc is equipped between the gripping section and positioning section.
The fixture is made of 40Cr steel.
The backboard is made of 40Cr steel.
Compared with the existing technology, composite structure simple possible is easily installed and dismantles the utility model, the advantage is that:
Clamp ends are equipped with ball head device, are not only convenient for installing test specimen in fixture, it is often more important that can be to avoid in drawing process
Torsion phenomenon is destroyed in the middle part of test specimen with guaranteeing test specimen maximum probability；And the groove of fixture is fitted closely with UHPC test specimen, test specimen
Stress more evenly, avoids local stress that test specimen is caused to destroy at contact surface position；Meanwhile fixture is avoided to become using backboard reinforcement
Shape, the backboard are fixed on fixture side using steel plate with fixture same material, not only can guarantee being bonded for test specimen and fixture
Degree, it is often more important that can be deformed under stress to avoid fixture.
Detailed description of the invention
Fig. 1 is the utility model UHPC test specimen uniaxial tensile test high-accuracy clamp main view in an embodiment.
Fig. 2 is the structural representation of the utility model UHPC test specimen uniaxial tensile test high-accuracy clamp in an embodiment
Figure.
Fig. 3 is the structural schematic diagram of the UHPC test specimen of the utility model in an embodiment.
Fig. 4 is the side view of the UHPC test specimen of the utility model in an embodiment.
In figure: the lower 6. lower end ball head device 7. of fixture of 1. upper end ball head device, 2. backboard, 3. upper fixture, 4. test specimen 5.
8. changeover portion of gripping section, 9. fixed section, 10. bolt.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing, the people of the structure and principle of this device to this profession
For be very clearly.It should be appreciated that specific embodiment described herein is only used to explain the utility model, and do not have to
In restriction the utility model.
It is the schematic diagram of UHPC test specimen employed in present embodiment referring to Fig. 3 and Fig. 4, the both ends of UHPC test specimen are used
Clamped by the fixture by present embodiment, a straight section is equipped between both ends, the diameter of straight section is less than the diameter at both ends, and both ends
Arc segment transition is used between straight section.
Referring to Fig. 1, the UHPC test specimen uniaxial tensile test high-accuracy clamp includes upper fixture and lower fixture, described
Upper fixture top be equipped with upper end ball head device and connecting rod and the outer end of the groove is located at upper fixture bottom end, it is described
Lower fixture bottom end is equipped with lower end ball head device and connecting rod and the outer end of the groove is located at lower fixture top.Described is recessed
The end shape of slot and the UHPC test specimen fits, for clamping the UHPC test specimen, the inner end of the groove
For gripping section, the outer end of the groove is positioning section, and the diameter of the positioning section is less than the straight of the gripping section
Diameter is equipped with the changeover portion of arc, the camber line of changeover portion and the UHPC test specimen two ends between the gripping section and positioning section
Arc segment between straight section is adapted.
Since the fixture of the prior art lacks backboard reinforcement measure, when stretching, can generate clamp port and deform and lead to stress collection
Middle phenomenon, it is all ideal not to the utmost that this also results in existing tension fixture either damage -form or measurement result accuracy.Cause
This, referring to fig. 2, in present embodiment, through-hole and bolt that the backboard is arranged by quadrangle are fixed on the side of fixture, no
It only can guarantee the compactness of test specimen and fixture, it is often more important that can be deformed under stress to avoid fixture.
Meanwhile the clamp ends are additionally provided with the connecting rod for connecting with puller system, the connecting rod and fixture
The junction of end is welded with ball head device, and the setting of ball head device is not only convenient for installing test specimen in fixture, it is often more important that
It can be destroyed in the middle part of test specimen with guaranteeing UHPC test specimen maximum probability to avoid the torsion phenomenon in drawing process.
In one preferred embodiment, the fixture and the backboard are all made of 40Cr steel and are made, further
The machining accuracy and structural stability in actual use for guaranteeing fixture are especially embodied in the accuracy aspect of elongation strain.
UHPC test specimen uniaxial tensile test high-accuracy clamp provided by present embodiment, for the spy of UHPC test specimen
Property, avoid the prior art general fixture stress collection neutralize discontinuity the problem of, can effectively avoid UHPC test specimen quilt
Destroy the tensile property test that can be easily and effectively realized in gripping section to UHPC test specimen.
Claims (5)
1. a kind of UHPC test specimen uniaxial tensile test high-accuracy clamp, it is characterised in that the fixture be equipped with it is described
The groove that the end shape of UHPC test specimen fits, for clamping the UHPC test specimen, the inner end of the groove is folder
Section is held, the outer end of the groove is positioning section, and the diameter of the positioning section is less than the diameter of the gripping section, institute
The side for the fixture stated is equipped with backboard being located at the groove location, and the clamp ends, which are additionally provided with, to be used for and puller system
The junction of the connecting rod of connection, the connecting rod and clamp ends is equipped with ball head device.
2. UHPC test specimen uniaxial tensile test high-accuracy clamp as described in claim 1, it is characterised in that the fixture
Including upper fixture and lower fixture, the upper fixture top is equipped with the outer end position of ball head device and connecting rod and the groove
In upper fixture bottom end, the lower fixture bottom end is equipped with ball head device and connecting rod and the outer end of the groove is located at lower folder
Has top.
3. UHPC test specimen uniaxial tensile test high-accuracy clamp as claimed in claim 1 or 2, it is characterised in that the folder
Hold the changeover portion that arc is equipped between section and positioning section.
4. UHPC test specimen uniaxial tensile test high-accuracy clamp as claimed in claim 1 or 2, it is characterised in that the folder
Tool is made of 40Cr steel.
5. UHPC test specimen uniaxial tensile test high-accuracy clamp as claimed in claim 1 or 2, it is characterised in that the back
Plate is made of 40Cr steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820802412.0U CN208283177U (en) | 2018-05-28 | 2018-05-28 | UHPC test specimen uniaxial tensile test high-accuracy clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820802412.0U CN208283177U (en) | 2018-05-28 | 2018-05-28 | UHPC test specimen uniaxial tensile test high-accuracy clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208283177U true CN208283177U (en) | 2018-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820802412.0U Active CN208283177U (en) | 2018-05-28 | 2018-05-28 | UHPC test specimen uniaxial tensile test high-accuracy clamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907267A (en) * | 2019-12-27 | 2020-03-24 | 上海建工集团股份有限公司 | Test piece and method for testing tensile strength of common concrete by using UHPC (ultra high Performance Poly carbonate) |
| CN112834354A (en) * | 2020-12-30 | 2021-05-25 | 芜湖中瑞汽车零部件有限公司 | Tool and method for testing static strength of car handle bracket assembly |
-
2018
- 2018-05-28 CN CN201820802412.0U patent/CN208283177U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907267A (en) * | 2019-12-27 | 2020-03-24 | 上海建工集团股份有限公司 | Test piece and method for testing tensile strength of common concrete by using UHPC (ultra high Performance Poly carbonate) |
| CN112834354A (en) * | 2020-12-30 | 2021-05-25 | 芜湖中瑞汽车零部件有限公司 | Tool and method for testing static strength of car handle bracket assembly |
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