CN215115670U - Fatigue test sample for thin-wall pipe - Google Patents
Fatigue test sample for thin-wall pipe Download PDFInfo
- Publication number
- CN215115670U CN215115670U CN202120594187.8U CN202120594187U CN215115670U CN 215115670 U CN215115670 U CN 215115670U CN 202120594187 U CN202120594187 U CN 202120594187U CN 215115670 U CN215115670 U CN 215115670U
- Authority
- CN
- China
- Prior art keywords
- main body
- pipe main
- transition
- connecting part
- thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to the field of mechanical property testing, and provides a fatigue test sample for thin-wall pipes, which comprises a pipe main body and a clamping piece; the pipe main body is of a tubular structure, two clamping pieces are arranged, and the two clamping pieces penetrate through two ends of the pipe main body respectively; the pipe main body is provided with a plurality of hollow structures with the same size and shape, and the hollow structures are uniformly arranged on the pipe main body in a surrounding manner; the pipe main body comprises a load part, a transition part and a connecting part; the part with the smallest cross section area of the pipe body is a load part, the part with the largest cross section area of the pipe body is the connecting part, and the transition part from the smallest cross section area to the largest cross section area of the pipe body is the transition part. Through the utility model discloses a rationally set up, guaranteed the uniformity of fatigue data with actual thin wall tubular product performance, improved the accuracy of thin wall tubular product fatigue life assessment result, can the wide application under the different conditions, the high of thin wall tubular product, low all fatigue performance test.
Description
Technical Field
The utility model relates to a mechanical properties tests the field, provides a be used for thin wall tubular product fatigue test sample very much.
Background
Fatigue failure is the primary failure mode of early mechanical components, and by incomplete statistics, over 80% of component failures are caused by fatigue, most of which are caused by sudden breakage, with the resulting loss often being severe. In actual conditions, many parts are tubular (such as fuel pipes in aircraft engines and cladding pipes in nuclear industry), and these tubular test pieces are usually subjected to long-term stress or vibration in service, so that cracks are generated and even failure fracture occurs. Therefore, before the tubular workpiece is put into use, the fatigue performance of the tubular workpiece needs to be researched through a fatigue test and correspondingly designed and improved, so that the use safety and the service life of the tubular workpiece are improved. Since many pipe samples are very thin in wall thickness and are difficult to process into fatigue samples suitable for use, such as rod-like samples or plate-like samples, the majority of pipe fatigue samples are whole-tube samples. However, the cross-sectional area of the sample is the same, so that the fracture position is relatively random, and the strain control in the sample process is difficult to perform. In order to solve the problem, the method for preparing the fatigue test piece of the high-temperature alloy thin-wall welded pipe adopts a sand paper grinding method to prepare the fatigue test piece of the high-temperature alloy thin-wall pipe. Although the method can enable the fatigue fracture position of the pipe to be in the working section (namely the part ground by using sand paper) and reflect the fatigue performance of the thin-walled pipe to a certain extent, the method has a plurality of defects: firstly, the method is difficult to ensure the uniform thinning thickness, and a sample is easy to crack from a thinner pipe wall after thinning during fatigue loading, thereby causing material performance testing errors; secondly, the influence of the surface state of an original workpiece on the fatigue performance of the material cannot be reflected after the surface of the sample is polished; and the cross section area of the working section of the polished pipe is difficult to calculate, so that the stress value cannot be accurately measured. Therefore, the method cannot reflect the real fatigue performance of the thin-wall pipe.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be used for thin wall tubular product fatigue test sample to solve the technical problem that the thin wall tubular product sample among the prior art can't truly reflect tubular product fatigue performance, provide feasible design and comprehensive testing method for thin wall tubular product fatigue test.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
the utility model provides a fatigue test sample for thin-wall pipes, which comprises a pipe main body and a clamping piece; the pipe main body is of a tubular structure, two clamping pieces are arranged, and the two clamping pieces penetrate through two ends of the pipe main body respectively;
the pipe main body is provided with a plurality of hollow structures with the same size and shape, and the hollow structures are uniformly arranged on the pipe main body in a surrounding manner; the pipe main body comprises a load part, a transition part and a connecting part; the part with the smallest cross section area of the pipe body is a load part, the part with the largest cross section area of the pipe body is the connecting part, and the transition part from the smallest cross section area to the largest cross section area of the pipe body is the transition part; the transition part comprises a left transition part and a right transition part, and the connecting part comprises a left connecting part and a right connecting part; the left connecting part, the left transition part, the load part, the right transition part and the right connecting part are sequentially arranged on the pipe main body;
the shaft section of the clamping piece is in a convex shape; the clamping piece comprises a large cylindrical part and a small cylindrical part, and the central axes of the large cylindrical part and the small cylindrical part are on the same straight line; a small cylindrical part on one of the clamping pieces penetrates through the left connecting part and is matched with the left connecting part; the small cylindrical part on the other clamping piece penetrates through the right connecting part and is matched with the right connecting part; the outer wall of the left connecting part of the pipe main body is connected with the large cylindrical part on one clamping piece through angle welding, and the outer wall of the right connecting part of the pipe main body is connected with the large cylindrical part on the other clamping piece through angle welding;
specifically, the transition part is arranged for realizing the gradual transition of the loading stress from the clamping piece to the loading part (similar to the transition arc part of a rod-shaped test sample), thereby avoiding artificial fatigue failure caused by stress concentration;
specifically, the small cylindrical part penetrates through the connecting part and is matched with the connecting part, so that the purpose of supporting the pipe main body can be achieved.
Furthermore, any two hollow structures can be symmetrical with the central axis of the pipe main body.
Further, the ratio of the cross-sectional area of the connecting portion to the cross-sectional area of the load portion is 2 or more.
Further, the length L of the load part0And the outer diameter R of the connecting part1The ratio therebetween ranges from 2 to 5.
Furthermore, the transition part is in smooth transition, and the curvature radius R of the arc part of the transition part and the outer diameter R of the connecting part1The ratio therebetween is 3 or more.
Further, the connecting portion length L1And the outer diameter R of the connecting part1The ratio therebetween ranges from 2 to 5.
Further, the length of the small cylindrical portion and the outer diameter R of the connecting portion1The ratio between the two is 2-5 and not less than the length L of the connecting part1。
Specifically, the length of the small cylindrical portion is 20mm or more.
Further, the load portion and the transition portion are integrally formed by machining.
Furthermore, the outer wall of the large cylindrical part is provided with a thread matched with the fatigue testing machine.
The utility model also provides an use the method that test sample carries out fatigue test, its concrete step is as follows:
the method comprises the following steps: preparing a pipe body part of a fatigue test sample of a thin-walled pipe, and obtaining a load part and a transition part by adopting a machining method;
step two: preparing a clamping piece, wherein the clamping piece is used for connecting the pipe main body with a plug head of a testing machine; the small cylindrical part is not loosened or deformed after being inserted into the thin-wall pipe;
thirdly, inserting the small cylindrical part of the clamping piece into the pipe main body, and connecting in a manual argon tungsten-arc welding mode to obtain a test sample;
and step four, assembling the fatigue test sample on a fatigue testing machine, and carrying out corresponding fatigue test.
The utility model provides a fatigue test sample for thin-wall pipes, wherein the pipe body for test is finished on the original pipe in a machining mode, so that the surface state of the load part of the pipe body is the same as that of the original pipe, and the truth of the test is improved; the cross sectional area of the middle load part of the pipe body is consistent, so that the extensometer is more convenient to clamp through reasonable design; and because the cross-sectional area of the load part is smaller than that of the connecting parts at the two ends, the fatigue fracture at the load part can be ensured, the consistency of fatigue data and the actual performance of the thin-walled pipe is ensured, the accuracy of the fatigue life evaluation result of the thin-walled pipe is improved, and the device can be widely applied to the high and low cycle fatigue performance test of the thin-walled pipe under different conditions (temperature, stress, strain level and the like).
Drawings
Fig. 1 is the utility model discloses a thin wall tubular product fatigue test sample structure sketch map.
Fig. 2 is the utility model discloses a thin wall tubular product fatigue test sample tubular product major structure sketch map.
Fig. 3 is the utility model discloses a thin wall tubular product fatigue test sample tubular product main part stereogram.
Fig. 4 is the utility model discloses a thin wall tubular product fatigue test sample holder structure sketch map.
Reference numerals: 1-a tube body; 11-a load section; 121-left transition; 122-right transition; 131-left connecting portion; 132-right connecting part; 2-a clamping member; 21-large cylindrical part; 22-small cylindrical portion.
Detailed Description
Example 1
The embodiment provides a fatigue test sample for a thin-wall pipe, which is shown in the attached drawings 1-4 and comprises a pipe main body 1 and a clamping piece 2; the pipe main body 1 is of a tubular structure, two clamping pieces 2 are arranged, and the two clamping pieces 2 respectively penetrate through two ends of the pipe main body 1;
the pipe main body 1 is provided with a plurality of hollow structures with the same size and shape, and the hollow structures are uniformly arranged on the pipe main body 1 in a surrounding manner; the pipe body 1 comprises a load part 11, a transition part and a connecting part; the part with the smallest cross section area of the pipe body 1 is a load part 11, the part with the largest cross section area of the pipe body 1 is the connecting part, and the transition part from the smallest cross section area to the largest cross section area of the pipe body 1 is the transition part; wherein the transition portion comprises a left transition portion 121 and a right transition portion 122, and the connecting portion comprises a left connecting portion 131 and a right connecting portion 132; the left connecting part 131, the left transition part 121, the load part 11, the right transition part 122 and the right connecting part 132 are sequentially arranged on the pipe body 1;
the axial section of the clamping piece 2 is in a convex shape; the clamping piece 2 comprises a large cylindrical part 21 and a small cylindrical part 22, and the central axes of the large cylindrical part 21 and the small cylindrical part 22 are on the same straight line; the small cylindrical part 22 of one of the clamping pieces 2 penetrates through the left connecting part 131 and is matched with the left connecting part 131; the small cylindrical part 22 of the other clamping piece 2 penetrates through the right connecting part 132 and is matched with the right connecting part 132; the outer wall of the left connecting part 131 of the pipe body 1 is connected with the large cylindrical part 21 on one clamping piece 2 through fillet welding, and the outer wall of the right connecting part 132 of the pipe body 1 is connected with the large cylindrical part 21 on the other clamping piece 2 through fillet welding;
specifically, the transition part is arranged for realizing the smooth transition of the loading stress from the clamping piece to the transition arc part of the loading part similar to a rod-shaped test sample, thereby avoiding artificial fatigue failure caused by stress concentration;
specifically, the small cylindrical portion 22 penetrates the connecting portion, and cooperates with the connecting portion to support the tube main body 1.
Further, any two of the hollow structures can be symmetrical about the central axis of the pipe body 1.
Further, the ratio of the cross-sectional area of the connecting portion to the cross-sectional area of the load portion 11 is 2 or more.
Further, the length L of the load part 110And the outer diameter R of the connecting part1The ratio therebetween ranges from 2 to 5.
Furthermore, the transition part is in smooth transition, and the curvature radius R of the arc part of the transition part and the outer diameter R of the connecting part1The ratio therebetween is 3 or more.
Further, the connecting portion length L1And the outer diameter R of the connecting part1The ratio therebetween ranges from 2 to 5.
Further, the length of the small cylindrical portion 22 and the connecting portion outer diameter R1The ratio between the two is 2-5 and not less than the length L of the connecting part1。
Specifically, the length of the small cylindrical portion 22 is 20mm or more.
Further, the load portion 11 and the transition portion are integrally formed by machining.
Further, the outer wall of the large cylindrical part 21 is provided with a thread matched with the fatigue testing machine.
The utility model is not the best known technology.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (9)
1. A fatigue test sample for a thin-wall pipe is characterized by comprising a pipe main body (1) and a clamping piece (2); the pipe main body (1) is of a tubular structure, two clamping pieces (2) are arranged, and the two clamping pieces (2) penetrate through two ends of the pipe main body (1) respectively;
the pipe main body (1) is provided with a plurality of hollow structures with the same size and shape, and the hollow structures are uniformly arranged on the pipe main body (1) in a surrounding manner; the pipe main body (1) comprises a load part (11), a transition part and a connecting part; the part with the smallest cross section area of the pipe main body (1) is a load part (11), the part with the largest cross section area of the pipe main body (1) is the connecting part, and the transition part from the smallest cross section area to the largest cross section area of the pipe main body (1) is the transition part; wherein the transition portion comprises a left transition portion (121) and a right transition portion (122), and the connecting portion comprises a left connecting portion (131) and a right connecting portion (132); the left connecting part (131), the left transition part (121), the load part (11), the right transition part (122) and the right connecting part (132) are sequentially arranged on the pipe main body (1);
the shaft section of the clamping piece (2) is in a convex shape; the clamping piece (2) comprises a large cylindrical part (21) and a small cylindrical part (22), and the central axes of the large cylindrical part (21) and the small cylindrical part (22) are on the same straight line; a small cylindrical part (22) on one clamping piece (2) penetrates through the left connecting part (131) and is matched with the left connecting part (131); the small cylindrical part (22) on the other clamping piece (2) penetrates through the right connecting part (132) and is matched with the right connecting part (132); the outer wall of the left connecting part (131) of the pipe body (1) is connected with the large cylindrical part (21) on one clamping piece (2) through fillet welding, and the outer wall of the right connecting part (132) of the pipe body (1) is connected with the large cylindrical part (21) on the other clamping piece (2) through fillet welding.
2. The fatigue test specimen for thin-walled tubes according to claim 1, characterized in that: any two hollow structures can be symmetrical with the central axis of the pipe main body (1).
3. The fatigue test specimen for thin-walled tubes according to claim 1, characterized in that: the ratio of the cross-sectional area of the connecting part to the cross-sectional area of the load part (11) is greater than or equal to 2.
4. The fatigue test specimen for thin-walled tubes according to claim 1, characterized in that: the length L of the load part (11)0And the outer diameter R of the connecting part1The ratio therebetween ranges from 2 to 5.
5. The fatigue test specimen for thin-walled tubes according to claim 1, characterized in that: the transition part is in smooth transition, and the curvature radius R of the arc part of the transition part and the outer diameter R of the connecting part1The ratio therebetween is 3 or more.
6. The fatigue test specimen for thin-walled tubes according to claim 1, characterized in that: the length L of the connecting part1And the outer diameter R of the connecting part1The ratio therebetween ranges from 2 to 5.
7. The fatigue test specimen for thin-walled tubes according to claim 1, characterized in that: the length of the small cylindrical part (22) and the outer diameter R of the connecting part1The ratio between the two is 2-5 and not less than the length L of the connecting part1。
8. The fatigue test specimen for thin-walled tubing according to claim 7, characterized in that: the length of the small cylindrical part (22) is 20mm or more.
9. The fatigue test specimen for thin-walled tubes according to claim 1, characterized in that: the load part (11) and the transition part are integrally formed by machining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594187.8U CN215115670U (en) | 2021-03-24 | 2021-03-24 | Fatigue test sample for thin-wall pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594187.8U CN215115670U (en) | 2021-03-24 | 2021-03-24 | Fatigue test sample for thin-wall pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215115670U true CN215115670U (en) | 2021-12-10 |
Family
ID=79344467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120594187.8U Expired - Fee Related CN215115670U (en) | 2021-03-24 | 2021-03-24 | Fatigue test sample for thin-wall pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215115670U (en) |
-
2021
- 2021-03-24 CN CN202120594187.8U patent/CN215115670U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104949884B (en) | A kind of the coefficient of normal anisortopy Direct Determination of tubing circumferential direction | |
| CN108982223B (en) | Method for measuring large-strain-range stress strain of metal round bar sample in uniaxial tensile test | |
| US11175206B2 (en) | Tube pure shear loading device and method | |
| CN111665132A (en) | Method for measuring fatigue crack propagation of opening corner | |
| CN215115670U (en) | Fatigue test sample for thin-wall pipe | |
| Procter et al. | The trepan or ring core method, centre-hole method, Sach's method, blind hole methods, deep hole technique | |
| CN113804541A (en) | Steel pipe sample for tensile test in high-pressure hydrogen environment and preparation method thereof | |
| CN207610928U (en) | A kind of silicon carbide cladding tubes axial tension detection device | |
| CN211697239U (en) | Fixture for detecting shearing force of spot welding of spacer grid guide pipe and spacer grid | |
| CN113188985A (en) | High-flux miniature four-point bending stress corrosion initiation test device and method | |
| CN113155650A (en) | Fatigue test sample and test method for thin-wall pipe | |
| KR100834494B1 (en) | A method for tensile testing an end cap weld in a tube region of an elongated nuclear fuel element specimen having a weld and an apparatus for conducting a tensile test to initiate failure in an end cap weld in an elongated nuclear fuel element specimen having an axial dimension | |
| CN106289969A (en) | The fracture toughness testing method of minor diameter thick-walled metal tubing | |
| CN108426504B (en) | Three-coordinate measuring device and method for measuring peak vertex wall thickness of thin-wall special-shaped pipe | |
| Nakasato et al. | Hot spinning formability of aluminum alloy tube | |
| CN109163973B (en) | Thin-walled tube sample loading device | |
| Wang et al. | Investigation on influence of mandrel shape on shear stress in pure shearing test of thin-walled aluminum alloy tubes | |
| CN215524548U (en) | Device for auxiliary measurement of broken sample of tensile test | |
| Bastola et al. | Full-and small-scale tests on strain capacity of X80 seamless pipes | |
| CN113447374A (en) | End face stress concentration eliminating device, test method and system | |
| CN110836818A (en) | Bidirectional stress test method for thin-wall circular tube | |
| CN217765699U (en) | High-temperature tensile sample of small-outer-diameter thin-walled tube | |
| CN205981900U (en) | Test thin -walled pipe hoop tensile strength's device | |
| CN112985983A (en) | Concrete axle draws testing arrangement | |
| CN114577572A (en) | High-temperature tensile sample of small-outer-diameter thin-walled tube and tensile method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20211210 |