CN113203623A - Annular strength testing device for tubular sample - Google Patents
Annular strength testing device for tubular sample Download PDFInfo
- Publication number
- CN113203623A CN113203623A CN202110309462.1A CN202110309462A CN113203623A CN 113203623 A CN113203623 A CN 113203623A CN 202110309462 A CN202110309462 A CN 202110309462A CN 113203623 A CN113203623 A CN 113203623A
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- China
- Prior art keywords
- soft rod
- tubular specimen
- testing
- tubular
- tubular sample
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Links
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 12
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 229940099259 vaseline Drugs 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Images
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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
- G01N2203/0014—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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
-
- 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
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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 invention relates to a device for testing the circumferential strength of a tubular sample, which comprises a soft rod capable of being matched with the tubular sample to be tested, and an upper positioning disc and a lower positioning disc which are respectively used for extending into the upper end and the lower end of the tubular sample, wherein when the soft rod is loaded into the tubular sample, the upper end and the lower end of the soft rod respectively abut against the upper positioning disc and the lower positioning disc. Compared with the prior art, the method can realize accurate measurement of the tensile strength of the small-diameter tubular sample with a flat inner wall in the circumferential direction, and is simple and convenient to operate.
Description
Technical Field
The invention belongs to the technical field of material performance testing, and relates to a device for testing the circumferential strength of a tubular sample.
Background
The test of the hoop tensile strength of the tubular sample is a common test item in the test of the mechanical property of materials. The annular tensile test of the tubular sample has a plurality of corresponding test standards which can be referred to, for example, a standardized open tension disc method is mature and has wide application and strong universality, but the method has certain limitations, for example, the tensile failure process is two-point stress instead of the whole annular uniform stress, which causes a great problem in the accuracy of the test result.
Disclosure of Invention
The invention aims to provide a device for testing the hoop strength of a tubular sample so as to realize quick and accurate test of the hoop strength of the tubular sample.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a tubulose sample hoop intensity testing arrangement, including the soft rod that can match the tubulose sample of examination of packing into and be used for respectively stretching into last positioning disk and the lower positioning disk of the upper end and the lower extreme of tubulose sample, and when soft rod packed into the tubulose sample, the upper and lower both ends of soft rod supported respectively go up positioning disk and lower positioning disk.
Further, the soft rod material is a polyurethane rod or a rubber rod.
Further, the outer diameter of the soft rod when undeformed matches the inner diameter of the tubular specimen.
Further, the length of the soft rod material when not deformed is 1/2-4/5 of the length of the tubular sample.
Further, the lower positioning plate comprises a lower positioning plate main body and a lower positioning plate bulge which is integrally formed with the lower positioning plate main body and can be matched with the lower positioning plate bulge extending into the lower end of the tubular sample.
Furthermore, last positioning disk include last positioning disk main part and with last positioning disk main part integrated into one piece and can match and stretch into the protruding of last positioning disk of tubulose sample upper end.
Furthermore, the length of the upper positioning plate protrusion satisfies the following conditions: during the test, when the upper positioning plate bulge contacts the undeformed soft rod, the upper positioning plate bulge only partially extends into the tubular sample.
Furthermore, the part of the upper positioning disc extending into the tubular sample, the soft rod and the part of the lower positioning disc extending into the tubular sample are all positioned on the central axis of the tubular sample.
Furthermore, before the soft rod is loaded into the tubular sample, vaseline is coated on the outer wall surface of the soft rod.
Further, during the test, the soft rod is placed in the middle of the tubular sample.
Compared with the prior art, the method has universality for testing the annular strength of the tubular sample with small diameter and flat inner wall, and can more accurately reflect the annular tensile strength of the tubular sample compared with an open tension disc method.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a lower puck;
FIG. 3 is a schematic structural view of an upper puck;
the notation in the figure is:
1-tubular sample, 2-soft rod, 3-lower positioning disk and 4-upper positioning disk.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments or examples, functional components or structures that are not specifically described are all conventional components or structures that are adopted in the art to achieve the corresponding functions.
In order to realize more accurate test of the circumferential strength of the tubular sample 1, the invention provides a device for testing the circumferential strength of the tubular sample 1, the device comprises a soft rod 2 which can be loaded into the tubular sample 1 to be tested in a matching way, and an upper positioning disk 4 and a lower positioning disk 3 which are respectively used for extending into the upper end and the lower end of the tubular sample 1, and when the soft rod 2 is loaded into the tubular sample 1, the upper end and the lower end of the soft rod 2 respectively support against the upper positioning disk 4 and the lower positioning disk 3.
In some embodiments, the flexible rod 2 is a polyurethane rod or a rubber rod.
In some embodiments, the outer diameter of the soft rod 2 when not deformed matches the inner diameter of the tubular sample 1 to ensure that the soft rod 2 is smoothly loaded into the tubular sample 1, and meanwhile, after the soft rod 2 is deformed by pressure, the tubular sample 1 is immediately subjected to hoop extrusion, so that the reaction is more timely and the test result is more accurate.
In some embodiments, the length of the soft rod 2 when undeformed is 1/2-4/5 of the length of the tubular sample 1.
In some embodiments, the lower puck 3 includes a lower puck body, and a lower puck protrusion integrally formed with the lower puck body and matably extending into the lower end of the tubular specimen 1; the upper positioning plate 4 comprises an upper positioning plate main body and an upper positioning plate bulge which is integrally formed with the upper positioning plate main body and can be matched with the upper end of the tubular sample 1 to extend into the upper end of the tubular sample.
In a more specific embodiment, the length of the upper positioning plate protrusion satisfies the following conditions: in the testing process, when the upper positioning plate bulge contacts the undeformed soft rod 2, the upper positioning plate bulge only partially extends into the tubular sample 1, so that the upper positioning plate 4 is loaded, and the hoop strength of the tubular sample 1 can be adjusted by adjusting the length of the upper positioning plate bulge extending into the tubular sample 1.
In some embodiments, the portion of the upper positioning plate 4 extending into the tubular sample 1, the portion of the soft rod 2 extending into the tubular sample 1, and the portion of the lower positioning plate 3 extending into the tubular sample 1 are all located on the central axis of the tubular sample 1, so as to ensure that the tubular sample 1 is uniformly stressed in the vertical direction all the time during the test process, and avoid deviation.
In some embodiments, before soft rod 2 is loaded into tubular sample 1, vaseline is also applied to the outer wall surface of soft rod 2.
In some embodiments, during testing, soft rod 2 is placed in the middle of tubular specimen 1.
The above embodiments may be implemented individually, or in any combination of two or more.
The above embodiments will be described in more detail with reference to specific examples.
Example 1:
for realizing more accurate test 1 hoop intensity of tubulose sample, this embodiment provides a 1 hoop intensity testing arrangement of tubulose sample, its structure is seen in figure 1, including can match pack into the soft rod 2 of the tubulose sample 1 that awaits measuring and be used for respectively stretching into last positioning disk 4 and lower positioning disk 3 of the upper end and the lower extreme of tubulose sample 1, and when soft rod 2 packed into tubulose sample 1, the upper and lower both ends of soft rod 2 supported respectively go up positioning disk 4 and lower positioning disk 3. The soft rod material 2 is a polyurethane rod or a rubber rod. The outer diameter of the soft rod 2 when undeformed matches the inner diameter of the tubular sample 1. The length of the soft rod 2 when undeformed is about 1/2 to 4/5 of the length of the tubular sample 1. The lower positioning plate 3 comprises a lower positioning plate main body and a lower positioning plate bulge which is integrally formed with the lower positioning plate main body and can be matched with the lower positioning plate bulge extending into the lower end of the tubular sample 1. The upper positioning plate 4 comprises an upper positioning plate main body and an upper positioning plate bulge which is integrally formed with the upper positioning plate main body and can be matched with the upper end of the tubular sample 1 to extend into the upper end of the tubular sample. The length of the upper positioning plate protrusion satisfies the following requirements: during the test, when the upper puck projections contact the undeformed soft rod 2, the upper puck projections only partially extend into the tubular sample 1. The portion of the upper positioning plate 4 extending into the tubular sample 1, the portion of the soft rod 2, and the portion of the lower positioning plate 3 extending into the tubular sample 1 are all located on the central axis of the tubular sample 1. Before the soft rod 2 was loaded into the tubular sample 1, vaseline was further coated on the outer wall surface of the soft rod 2. During the test, the soft rod 2 was placed in the middle of the tubular sample 1.
The test process of the test device of the embodiment specifically includes:
(1) the sample was cut into a tubular sample 1 as in fig. 1, having a length of about 30mm, and the inner wall of the tubular sample 1 was cleaned to remove dust and impurities attached to the wall of the tube.
(2) A soft rod 2 (polyurethane rod is adopted in the embodiment) with the length of about 20mm is taken, and the section is ensured to be smooth and flat for standby.
(3) Vaseline was applied to the outer wall of the flexible rod 2, assembled with the tubular sample 1, and placed in the middle of the tubular sample 1.
(4) And assembling the assembled tubular sample 1 and the lower positioning plate 3 together, and fixing the tubular sample on the step.
(5) And assembling the upper positioning plate 4 on the upper part of the tubular sample 1 to form a whole, and adjusting the height of loading equipment (such as a tensile machine) for testing to obtain the test.
(6) In the test process, the upper positioning disc 4 is loaded, the depth of the upper positioning disc extending into the upper part of the tubular sample 1 is adjusted, so that the circumferential pressure borne by the tubular sample 1 is adjusted, and the circumferential strength of the tubular sample is measured.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a tubulose sample hoop intensity testing arrangement which characterized in that, including the soft rod that can match the tubulose sample of awaiting measuring of packing into and be used for respectively stretching into last positioning disk and the lower positioning disk of the upper end and the lower extreme of tubulose sample, and when soft rod packed into the tubulose sample, the upper and lower both ends of soft rod supported respectively last positioning disk and lower positioning disk.
2. The apparatus for testing the hoop strength of a tubular specimen according to claim 1, wherein the soft rod is a polyurethane rod or a rubber rod.
3. The apparatus for testing the hoop strength of a tubular specimen according to claim 1, wherein the outer diameter of the soft rod when undeformed matches the inner diameter of the tubular specimen.
4. The device for testing the hoop strength of a tubular specimen according to claim 1, wherein the length of the soft rod when undeformed is 1/2-4/5 of the length of the tubular specimen.
5. The apparatus for testing the circumferential strength of a tubular specimen according to claim 1, wherein the lower puck comprises a lower puck body and a lower puck protrusion integrally formed with the lower puck body and matably extending into the lower end of the tubular specimen.
6. The apparatus for testing the circumferential strength of a tubular specimen according to claim 1, wherein the upper puck comprises an upper puck body and an upper puck protrusion integrally formed with the upper puck body and matably extending into the upper end of the tubular specimen.
7. The device for testing the hoop strength of a tubular specimen according to claim 6, wherein the length of the protrusion of the upper positioning plate satisfies the following requirements: during the test, when the upper positioning plate bulge contacts the undeformed soft rod, the upper positioning plate bulge only partially extends into the tubular sample.
8. The apparatus for testing the circumferential strength of a tubular specimen according to claim 1, wherein the portion of the upper puck extending into the tubular specimen, the soft rod, and the portion of the lower puck extending into the tubular specimen are all located on the central axis of the tubular specimen.
9. The apparatus for testing the hoop strength of a tubular specimen according to claim 1, wherein vaseline is further coated on the outer wall surface of the soft rod before the soft rod is loaded into the tubular specimen.
10. The apparatus for testing the hoop strength of a tubular specimen according to claim 1, wherein the soft rod is placed at the middle position of the tubular specimen during the testing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110309462.1A CN113203623A (en) | 2021-03-23 | 2021-03-23 | Annular strength testing device for tubular sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110309462.1A CN113203623A (en) | 2021-03-23 | 2021-03-23 | Annular strength testing device for tubular sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113203623A true CN113203623A (en) | 2021-08-03 |
Family
ID=77025611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110309462.1A Pending CN113203623A (en) | 2021-03-23 | 2021-03-23 | Annular strength testing device for tubular sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113203623A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4444058A (en) * | 1982-05-28 | 1984-04-24 | The United States Of America As Represented By The United States Department Of Energy | Method and apparatus for determining tensile strength |
| US20060070455A1 (en) * | 2004-09-28 | 2006-04-06 | Hendrich William R | Expanded plug method for developing circumferential mechanical properties of tubular materials |
| CN1865906A (en) * | 2006-06-14 | 2006-11-22 | 哈尔滨工业大学 | Pipe hoop stress tensility testing method |
| JP2009294136A (en) * | 2008-06-06 | 2009-12-17 | Ihi Corp | Tension bending test method of tubular test specimen and device therefor |
| JP2011089861A (en) * | 2009-10-22 | 2011-05-06 | National Institute For Materials Science | Sealed mas test tube |
-
2021
- 2021-03-23 CN CN202110309462.1A patent/CN113203623A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4444058A (en) * | 1982-05-28 | 1984-04-24 | The United States Of America As Represented By The United States Department Of Energy | Method and apparatus for determining tensile strength |
| US20060070455A1 (en) * | 2004-09-28 | 2006-04-06 | Hendrich William R | Expanded plug method for developing circumferential mechanical properties of tubular materials |
| CN1865906A (en) * | 2006-06-14 | 2006-11-22 | 哈尔滨工业大学 | Pipe hoop stress tensility testing method |
| JP2009294136A (en) * | 2008-06-06 | 2009-12-17 | Ihi Corp | Tension bending test method of tubular test specimen and device therefor |
| JP2011089861A (en) * | 2009-10-22 | 2011-05-06 | National Institute For Materials Science | Sealed mas test tube |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20210803 |