CN111855393A - Brittle material tensile strength test clamping device - Google Patents
Brittle material tensile strength test clamping device Download PDFInfo
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- CN111855393A CN111855393A CN202010751016.1A CN202010751016A CN111855393A CN 111855393 A CN111855393 A CN 111855393A CN 202010751016 A CN202010751016 A CN 202010751016A CN 111855393 A CN111855393 A CN 111855393A
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- flexible rope
- tensile strength
- bonding sleeve
- brittle material
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- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 239000000853 adhesive Substances 0.000 claims abstract description 9
- 230000001070 adhesive effect Effects 0.000 claims abstract description 9
- 238000005452 bending Methods 0.000 claims description 10
- 239000004519 grease Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 5
- 238000009864 tensile test Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0212—Theories, calculations
- G01N2203/0216—Finite elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0429—Chucks, fixtures, jaws, holders or anvils using adhesive bond; Gluing
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a brittle material tensile strength test clamping device, contains the same clamping equipment of two sets of structures, and clamping equipment contains flexible rope mechanism and sample bonding sleeve mechanism, and the one end of sample is lived in the sample bonding sleeve mechanism bonding to be connected to the top connection pull rod or the lower clutch pull rod of stretcher through flexible rope mechanism. The sample bonding sleeve mechanism comprises a bonding sleeve and a screw rod, one end of the screw rod is connected with a flexible rope mechanism, the other end of the screw rod is connected with the bonding sleeve through a thread pair, one end of the sample stretches into the bonding sleeve, the sample is bonded with the bonding sleeve and the screw rod through an adhesive, and the flexible rope mechanism comprises two U-shaped buckles connected through a flexible rope. The invention ensures that the central line of the sample and the tension acting line are in the same straight line under the action of tension, avoids the sample from being additionally bent and twisted, ensures the accuracy and reliability of the test result, ensures the uniform stress of the clamping end of the sample and ensures the successful performance of the test.
Description
Technical Field
The invention relates to a clamping device for testing the tensile strength of a brittle material.
Background
Brittle materials are materials which undergo only small deformations, i.e. fracture, under the action of external forces (e.g. stretching, bending)
The ceramic material is an important material in modern economic construction and national defense construction, compared with other solid materials, the ceramic has the advantages of high temperature resistance, corrosion resistance, wear resistance, high hardness and the like, but due to the brittleness, the ceramic material is also the most easily-occurring accident and the most unsafe material. The compressive strength of the ceramic material is far greater than the tensile strength, and the damage is basically caused by tensile stress, so that the research on the tensile mechanical property of the ceramic brittle material and the direct test on the tensile strength of the brittle material have very important significance.
This is difficult to achieve with brittle materials since the tensile test requires uniform stress in the specimen. Because the test requires that the tensile tester chuck can buffer the clamping force and be absolutely vertically centered and not deflectable, otherwise the brittle material sample can be accidentally damaged by the additional clamping force, bending and twisting, which makes the tensile test expensive and the accuracy of the test data difficult to guarantee.
In order to solve the influence of eccentricity, it is prescribed in japanese JISRI606 standard that a centering device, a bearing, a buffer holding device, and the like are introduced into a tensile test system to control the bending strain component within 10%. In the ASTM standard in the united states, the bending strain component is limited to within 5%. GB/T23805-2009 Fine brittle material room temperature tensile strength test method also proposes that when a brittle material tensile test is carried out, the bending degree of the brittle material needs to be checked to ensure axial centering. At present, no effective method for simultaneously solving the above problems is available in Chinese patent literature.
Disclosure of Invention
The invention provides a clamping device for testing the tensile strength of a brittle material, which ensures that a central line of a sample and a tensile force acting line are on the same straight line under the action of tensile force, avoids the sample from being additionally bent and twisted, ensures the accuracy and reliability of a test result, ensures that a clamping end of the sample is uniformly stressed and has small stress concentration, avoids the possibility of damage of the sample at the clamping end, and ensures that the test can be successfully carried out.
In order to achieve the above object, the present invention provides a clamping device for testing tensile strength of a brittle material, comprising: the clamping device comprises two groups of clamping devices with the same structure, wherein each group of clamping devices respectively connect the upper end and the lower end of a sample to an upper joint and a lower joint of a stretcher;
the clamping equipment comprises a flexible rope mechanism and a sample bonding sleeve mechanism, wherein the sample bonding sleeve mechanism is bonded at one end of a sample and is connected to an upper joint pull rod or a lower joint pull rod of a stretcher through the flexible rope mechanism;
the sample bonding sleeve mechanism comprises a bonding sleeve and a screw rod, one end of the screw rod is connected with a flexible rope mechanism, the other end of the screw rod is connected with the bonding sleeve through a thread pair, one end of a sample extends into the bonding sleeve, and the sample is bonded with the bonding sleeve and the screw rod through an adhesive;
flexible rope mechanism contain and detain through two U types that flexible rope links to each other, every U type is detained and is all contained the curved and screw of U type, flexible rope connect the U type curved on, the screw with the other end of screw rod or the top connection pull rod or the lower clutch pull rod of stretcher pass through the revolute pair and connect.
The sample bonding depth d satisfies:
2πrdτ>πr2σb
where τ is the actual shear strength of the adhesive, r is the diameter of the sample, σbIs the actual tensile strength of the sample.
The bonding sleeve has a gradually decreasing outer diameter at the edge.
The inner wall of the bonding sleeve is circumferentially grooved, and the outer wall of the bonding sleeve is circumferentially grooved.
The flexible rope is fixedly connected to the U-shaped bend of the U-shaped buckle in a winding or buckling mode.
One end of the U-shaped bend on the U-shaped buckle is provided with a unthreaded hole, the other end of the U-shaped bend is provided with a threaded hole, and the centers of the unthreaded hole and the threaded hole are collinear.
The screw is a half-thread screw, and the outer cylindrical surface of the revolute pair is not threaded and is coated with lubricating grease.
The flexible rope adopts an object which can not transmit torque, pressure and bending moment.
The clamping device for testing the tensile strength of the brittle material can completely meet the requirements of Japanese JISRI606 standard, American ASTM standard and Chinese national standard on the range of bending strain components. The invention not only ensures that the central line of the sample and the tensile force acting line are in the same straight line under the action of tensile force, avoids the sample from being additionally bent and distorted, ensures the accuracy and reliability of the test result, but also ensures that the clamping end of the sample is uniformly stressed and the stress concentration is small, can avoid the possibility of the sample being damaged at the clamping end by calculating and designing the size of the sample, and ensures that the test can be successfully carried out.
Drawings
Fig. 1 is a schematic structural diagram of a clamping device for testing the tensile strength of a brittle material provided by the invention.
Fig. 2 is a schematic structural view of a sample bonding sleeve mechanism.
Fig. 3 is a schematic view of the structure of the sample.
Fig. 4 is a schematic view of the construction of the flexible cord mechanism.
FIG. 5 is a first principal stress cloud calculated using finite element numerical methods for a typical sample under tension.
Detailed Description
The preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 5.
As shown in fig. 1, the present invention provides a clamping device for testing tensile strength of brittle material, comprising: and two groups of clamping equipment with the same structure are arranged, and each group of clamping equipment is used for connecting the upper end and the lower end of the sample 3 to the upper joint and the lower joint of the stretcher respectively.
Clamping equipment contain flexible rope mechanism 1 and sample bonding sleeve mechanism 2, sample bonding sleeve mechanism 2 bond the one end of sticking sample 3 to be connected to the top connection pull rod or the lower joint pull rod of stretcher through flexible rope mechanism 1.
As shown in fig. 1 to 3, the sample bonding sleeve mechanism 2 includes a bonding sleeve 10 and a screw 8, one end of the screw 8 is connected to the flexible cord mechanism 1, the other end is connected to the bonding sleeve 10 by a screw pair, one end of the sample 3 is inserted into the bonding sleeve 10, and the sample 3 is bonded to the bonding sleeve 10 and the screw 8 by an adhesive 11.
As shown in fig. 1 and 4, the flexible rope mechanism 1 comprises two U-shaped buckles connected by a flexible rope 6, each U-shaped buckle comprises a U-shaped bend 13 and a screw 12, and the screw 12 is connected at the opening of the U-shaped bend 13. In one embodiment of the invention, the flexible rope 6 is connected to the U-bend of the upper U-buckle 5 and the U-bend of the lower U-buckle 7 by winding, buckling and the like, the pull rod 4 of the stretcher is connected with the screw of the upper U-buckle 5 through a revolute pair, and the screw of the lower U-buckle 7 is connected with the other end of the screw 8 through a revolute pair.
The flexible rope mechanism 1 flexibly connects the test sample 3 to the upper joint and the lower joint of the stretcher. Because the flexible rope 6 can not transmit torque, bending moment and pressure, the sample 3 can not be bent and distorted in the tensile test, and the flexible rope 6 can be bent, so that the sample 3 is convenient to install and operate, the tension of the sample 3 in the test process is gradually increased from 0N, the difficulty in operation in a conventional clamping mode is avoided, and the possibility of sudden change of the bearing tension of the sample is avoided.
One end of a U-shaped bend 13 on the U-shaped buckle is provided with a unthreaded hole, the other end of the U-shaped bend is provided with a threaded hole, and the centers of the two holes are collinear. The screw 12 is a half-thread screw, and the outer cylindrical surface of the revolute pair is not threaded and is coated with lubricating grease. The U-shaped buckle can ensure that the flexible rope 6 is automatically centered in the stretching process, and is convenient for dismounting the sample.
As shown in FIG. 5, in the example of the present invention, the actual tensile strength σ according to the specimen 3 was measuredbThe actual shear strength τ of the adhesive, the sum of the screw-in depth of the screw 8 and the bonding depth of the sample should be equal to the length of the bonding sleeve 10. The proper screw-in depth of the screw 8 is selected to determine the proper sample bonding depth d to ensure 2 pi rd tau>πr2σb(r is the diameter of sample 3), the adhesive sleeve 10 is fixed by the clamp nut 9. The sample is clamped by adopting the bonding mode, so that the clamping damage of the sample possibly caused by stress concentration due to uneven stress of the conventional clamping mode is avoided. The outer diameter of the bonding sleeve 10 at the edge is gradually reduced, and the inner wall and the outer wall are provided with grooves in the circumferential direction in a staggered mode, so that the rigidity variation of the bonding sleeve 10 to a bonded sample is reduced, the stress concentration of the sample is further reduced, and the possibility that the sample is broken at the bonding boundary position is reduced. The outer diameter size and the circumferential grooving depth of the edge of the bonding sleeve 10 and the size of the sample are properly calculated and designed through a finite element numerical method, so that the test area where the first main stress maximum value of the sample appears is not present in the bonding area and the size transition area of the sample in a tensioned state, and the effectiveness of a tensile test result is guaranteed.
The clamping device for testing the tensile strength of the brittle material can completely meet the requirements of Japanese JISRI606 standard, American ASTM standard and Chinese national standard on the range of bending strain components. The invention not only ensures that the central line of the sample and the tensile force acting line are in the same straight line under the action of tensile force, avoids the sample from being additionally bent and distorted, ensures the accuracy and reliability of the test result, but also ensures that the clamping end of the sample is uniformly stressed and the stress concentration is small, can avoid the possibility of the sample being damaged at the clamping end by calculating and designing the size of the sample, and ensures that the test can be successfully carried out.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (8)
1. The utility model provides a brittle material tensile strength test clamping device which characterized in that contains: the clamping device comprises two groups of clamping devices with the same structure, wherein each group of clamping devices respectively connect the upper end and the lower end of a sample to an upper joint and a lower joint of a stretcher;
the clamping equipment comprises a flexible rope mechanism and a sample bonding sleeve mechanism, wherein the sample bonding sleeve mechanism is bonded on one end of a sample and is connected to an upper joint pull rod or a lower joint pull rod of a stretcher through the flexible rope mechanism;
the sample bonding sleeve mechanism comprises a bonding sleeve and a screw rod, one end of the screw rod is connected with a flexible rope mechanism, the other end of the screw rod is connected with the bonding sleeve through a thread pair, one end of a sample extends into the bonding sleeve, and the sample is bonded with the bonding sleeve and the screw rod through an adhesive;
flexible rope mechanism contain and detain through two U types that flexible rope links to each other, every U type is detained and is all contained the curved and screw of U type, flexible rope connect the U type curved on, the screw with the other end of screw rod or the top connection pull rod or the lower clutch pull rod of stretcher pass through the revolute pair and connect.
2. The clamping device for testing the tensile strength of the brittle material according to claim 1, wherein the bonding depth d of the test specimen satisfies the following condition:
2πrdτ>πr2σb
where τ is the actual shear strength of the adhesive, r is the diameter of the sample, σbIs the actual tensile strength of the sample.
3. The holder for clamping a tensile strength test of a brittle material as claimed in claim 1, wherein the adhesive sleeve has a gradually decreasing outer diameter at the edge.
4. The clamping device for testing the tensile strength of the brittle material as claimed in claim 1, wherein the inner wall of the bonding sleeve is circumferentially grooved, and the outer wall of the bonding sleeve is circumferentially grooved.
5. The clamping device for testing the tensile strength of the brittle material as claimed in claim 1, wherein the flexible rope is fixedly connected to the U-shaped bend of the U-shaped buckle in a winding or buckling manner.
6. The brittle material tensile strength test clamping device as claimed in claim 1, wherein one end of the U-shaped bend on the U-shaped buckle is provided with a light hole, the other end of the U-shaped bend is provided with a threaded hole, and the centers of the light hole and the threaded hole are collinear.
7. The clamping device for testing the tensile strength of the brittle material as claimed in claim 1, wherein the screw is a half-thread screw, and the outer cylindrical surface of the revolute pair is unthreaded and coated with grease.
8. The clamping device for testing the tensile strength of the brittle material as claimed in claim 1, wherein the flexible rope is an object which can not transmit torque, pressure and bending moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751016.1A CN111855393A (en) | 2020-07-30 | 2020-07-30 | Brittle material tensile strength test clamping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751016.1A CN111855393A (en) | 2020-07-30 | 2020-07-30 | Brittle material tensile strength test clamping device |
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| Publication Number | Publication Date |
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| CN111855393A true CN111855393A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010751016.1A Pending CN111855393A (en) | 2020-07-30 | 2020-07-30 | Brittle material tensile strength test clamping device |
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| CN (1) | CN111855393A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199761A (en) * | 2021-12-23 | 2022-03-18 | 国网山东省电力公司临沂供电公司 | Be applied to high accuracy utensil of survey bonding sample intensity |
| CN117686341A (en) * | 2024-02-04 | 2024-03-12 | 洛阳双瑞精铸钛业有限公司 | Intensity detection tool and detection method for titanium alloy universal joint for deep sea communication |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866992A (en) * | 1987-02-27 | 1989-09-19 | Rice Edward K | Device and method for tensile testing of brittle materials |
| CN101178342A (en) * | 2007-11-30 | 2008-05-14 | 山东大学 | Brittle material test piece moulds and matching tensile test cramping apparatus thereof |
| CN103364271A (en) * | 2013-07-02 | 2013-10-23 | 中国工程物理研究院化工材料研究所 | Fragile material tensile test clamp |
| CN203643248U (en) * | 2013-11-19 | 2014-06-11 | 浙江工业大学 | Hollow pipe chuck structure |
| CN108562491A (en) * | 2018-04-24 | 2018-09-21 | 钦州学院 | Automatic centering type rocks in direct tension experimental rig |
| CN110031311A (en) * | 2019-05-20 | 2019-07-19 | 贵州工程应用技术学院 | The method of rapid survey rock tensile mechanical properties |
| CN110044692A (en) * | 2019-05-22 | 2019-07-23 | 中国民航大学 | A kind of high temperature tension test fixture for fragile material flat test piece |
-
2020
- 2020-07-30 CN CN202010751016.1A patent/CN111855393A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866992A (en) * | 1987-02-27 | 1989-09-19 | Rice Edward K | Device and method for tensile testing of brittle materials |
| CN101178342A (en) * | 2007-11-30 | 2008-05-14 | 山东大学 | Brittle material test piece moulds and matching tensile test cramping apparatus thereof |
| CN103364271A (en) * | 2013-07-02 | 2013-10-23 | 中国工程物理研究院化工材料研究所 | Fragile material tensile test clamp |
| CN203643248U (en) * | 2013-11-19 | 2014-06-11 | 浙江工业大学 | Hollow pipe chuck structure |
| CN108562491A (en) * | 2018-04-24 | 2018-09-21 | 钦州学院 | Automatic centering type rocks in direct tension experimental rig |
| CN110031311A (en) * | 2019-05-20 | 2019-07-19 | 贵州工程应用技术学院 | The method of rapid survey rock tensile mechanical properties |
| CN110044692A (en) * | 2019-05-22 | 2019-07-23 | 中国民航大学 | A kind of high temperature tension test fixture for fragile material flat test piece |
Non-Patent Citations (1)
| Title |
|---|
| 曾飞涛等: "基于新型直接拉伸试验方法的砂岩力学特性研究", 《矿业研究与开发》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199761A (en) * | 2021-12-23 | 2022-03-18 | 国网山东省电力公司临沂供电公司 | Be applied to high accuracy utensil of survey bonding sample intensity |
| CN114199761B (en) * | 2021-12-23 | 2024-02-27 | 国网山东省电力公司临沂供电公司 | High-precision instrument applied to measuring strength of bonding sample |
| CN117686341A (en) * | 2024-02-04 | 2024-03-12 | 洛阳双瑞精铸钛业有限公司 | Intensity detection tool and detection method for titanium alloy universal joint for deep sea communication |
| CN117686341B (en) * | 2024-02-04 | 2024-05-10 | 洛阳双瑞精铸钛业有限公司 | Intensity detection tool and detection method for titanium alloy universal joint for deep sea communication |
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Application publication date: 20201030 |