CN210090190U - Minimally invasive tensile sample and clamp thereof - Google Patents
Minimally invasive tensile sample and clamp thereof Download PDFInfo
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- CN210090190U CN210090190U CN201920729967.1U CN201920729967U CN210090190U CN 210090190 U CN210090190 U CN 210090190U CN 201920729967 U CN201920729967 U CN 201920729967U CN 210090190 U CN210090190 U CN 210090190U
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- 238000012360 testing method Methods 0.000 abstract description 10
- 238000003754 machining Methods 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 15
- 238000009864 tensile test Methods 0.000 description 15
- 238000005520 cutting process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
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Abstract
The utility model relates to a mechanical properties tests the field, discloses a tensile sample of wicresoft and tensile sample's anchor clamps. The minimally invasive tensile sample comprises a connecting portion (1), a first end portion (2) and a second end portion (3), wherein the first end portion (2) and the second end portion (3) are located at two ends of the connecting portion respectively, the connecting portion (1), the first end portion (2) and the second end portion (3) are of cylindrical structures and are coaxially arranged, the diameter of the connecting portion (1) is smaller than that of the first end portion (2) and that of the second end portion (3), the first end portion (2) and the connecting portion are connected through a first arc transition portion (4) arranged in the circumferential direction, and the second end portion (3) and the connecting portion are connected through a second arc transition portion (5) arranged in the circumferential. The utility model discloses a tensile sample of wicresoft is through omitting tip screw thread design for the screw thread processing preparation procedure has been lacked in the sample course of working, makes it in the preparation process, does not receive condition restrictions such as machining, thereby can realize the preparation of the small-size sample of satisfying the condition.
Description
Technical Field
The utility model relates to a mechanical properties tests the field, specifically relates to a tensile sample of wicresoft and tensile sample's anchor clamps.
Background
A large number of temperature-bearing and pressure-bearing thick-wall pipeline components exist in the fields of electric power, petrochemical industry and the like, the state and service life of a traditional metal component are evaluated in a standard mechanical property test mode after a large sample is prepared by cutting a pipe, and the traditional inspection method for cutting the pipe has the defects of large damage, difficulty in repair, high risk after repair, poor economy caused by shutdown and the like.
As the micro-damage characteristic of the minimally invasive technology determines that the sampling size of the micro-damage. Based on the research result in the aspect of minimally invasive sample preparation at present, the minimally invasive platelet sample is prepared in a bowl-shaped minimally invasive digging block with the diameter of less than 30mm and the thickness of less than 6mm, but the cross section of a gauge length section of the platelet sample is rectangular, so that the stress and deformation are not uniform enough in the process of a tensile test, and the consistency of tensile test data of the platelet sample and a standard sample and the stability of parallel sample data are not equal to those of a bar sample.
However, the existing standard bar tensile test sample adopts a mode of being connected with the end part of the clamp in a threaded manner, and the preparation of the minimally invasive bar test sample with the thread diameter of less than 6mm is very difficult due to the limit of the existing machining level. Therefore, a minimally invasive rod sample capable of meeting the size processing requirements needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the unable small-size wicresoft stick sample preparation problem that realizes that prior art exists, providing a wicresoft tensile sample, this sample does not receive condition restrictions such as machining in the preparation process to can realize satisfying the preparation of the small-size sample of condition, overcome the difficult problem of wicresoft's life-span aassessment.
In order to achieve the above object, an aspect of the present invention provides a minimally invasive tensile specimen, including a connecting portion and a first end portion and a second end portion respectively located at both ends of the connecting portion, the connecting portion the first end portion and the second end portion all adopt a cylindrical structure and coaxial arrangement, the diameter of the connecting portion is smaller than the first end portion and the diameter of the second end portion, the first end portion and a first circular arc transition portion arranged between the connecting portions in a circumferential direction are connected, and the second end portion and a second circular arc transition portion arranged between the connecting portions in a circumferential direction are connected.
Preferably, the diameter of the connecting part is in the range of 1-3mm, and the diameter of the first end part and the second end part is in the range of 2-6 mm.
Preferably, the first arc transition portion is disposed to be concave toward the axis direction of the connection portion, and the second arc transition portion is disposed to be concave toward the axis direction of the connection portion.
Preferably, the minimally invasive tensile specimen is a symmetrical structure, and the first end portion and the second end portion are the same in size.
The utility model discloses the second aspect provides a tensile sample's of wicresoft anchor clamps, anchor clamps are used for the above-mentioned arbitrary scheme of centre gripping the tensile sample of wicresoft, anchor clamps are including being used for the centre gripping first interior anchor clamps of first end with be used for the centre gripping anchor clamps in the second of second end, anchor clamps include two anchor clamps bodies that set up half and half respectively in first interior anchor clamps and the second, every the inside inner groovy that is equipped with of anchor clamps body, two of first interior anchor clamps form after the anchor clamps body merges at least with the first chamber that holds that first end and first circular arc transition portion match, two of anchor clamps in the second form after the anchor clamps body merges at least with the second that second end and second circular arc transition portion match holds the chamber.
Preferably, the clamp bodies are of a wedge-shaped structure, the cross sections of the first inner clamp and the second inner clamp formed by combining the two clamp bodies arranged in half are rectangular, and the length of the cross section of the inner clamp is gradually reduced along the direction from the end part to the middle part of the minimally invasive tensile test sample.
Preferably, the inner groove is provided to extend in an axial direction of the connecting portion.
Preferably, two clamp bodies of the same inner clamp can be fixed by a fixing pin perpendicular to the inner groove after being combined.
Preferably, each of the clamp bodies is provided with a through hole perpendicular to the inner groove, the two through holes of the same inner clamp body are butted to form a pin hole for penetrating the fixing pin, and the inner groove and the pin hole are intersected.
Preferably, the clamp of the minimally invasive tensile sample comprises a first outer clamp and a second outer clamp, a mounting cavity matched with the first inner clamp in shape is arranged in the first outer clamp, and a mounting cavity matched with the second inner clamp in shape is arranged in the second outer clamp.
Through the technical scheme, the utility model discloses a wicresoft tensile sample has changed the connected mode of tensile in-process and anchor clamps through omitting tip screw thread design for screw thread processing preparation procedure has been lacked in the sample course of working, has broken the size restriction of the tensile sample that leads to because screw thread processing, that is to say exactly through the utility model discloses a wicresoft tensile sample's structural design makes it in the preparation process, does not receive condition restrictions such as machining, thereby can realize satisfying the preparation of the small-size sample of condition, has overcome the difficult problem that the life-span of wicresoft assesses, makes the bar sample of wicresoft can pioneering be applied to power station metal parts wicresoft life-span aassessment.
Drawings
Fig. 1 is a schematic structural diagram of a minimally invasive tensile specimen according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an inner clamp in a clamp for a minimally invasive tensile specimen according to an embodiment of the present invention in a clamped state;
fig. 3 is an exploded view of the inner clamp of fig. 2 in an assembled state;
FIG. 4 is a cross-sectional view of the second inner clamp of FIG. 2;
fig. 5 is a schematic structural diagram of a minimally invasive tensile specimen clamp according to an embodiment of the present invention, which is used for stretching a specimen.
Description of the reference numerals
1-connecting part, 2-first end part, 3-second end part, 4-first circular arc transition part, 5-second circular arc transition part, 6-first inner clamp, 7-second inner clamp, 8-clamp body, 9-inner groove, 10-pin hole, 11-first outer clamp, 12-second outer clamp, 13-first pull rod, 14-second pull rod.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
With reference to fig. 1, according to an aspect of the present invention, a minimally invasive tensile test specimen is provided, including a connecting portion 1 and a first end portion 2 and a second end portion 3 respectively located at two ends of the connecting portion, the connecting portion 1 the first end portion 2 and the second end portion 3 all adopt a cylindrical structure and are coaxially disposed, a diameter of the connecting portion 1 is smaller than a diameter of the first end portion 2 and a diameter of the second end portion 3, the first end portion 2 and a first circular arc transition portion 4 disposed between the connecting portion 1 through a circumferential direction are connected, and the second end portion 3 and a second circular arc transition portion 5 disposed between the connecting portion 1 through the circumferential direction are connected.
Through the technical scheme, the utility model discloses a wicresoft tensile sample is through omitting tip screw thread design, has changed the connected mode between tensile in-process sample and the anchor clamps, changes threaded connection into the centre gripping to be connected for the screw thread processing preparation procedure has been lacked in the sample course of working, has broken the size restriction of the tensile sample that leads to because screw thread processing, that is to say that through the utility model discloses a wicresoft tensile sample's structural design makes it in the preparation process, does not receive condition restrictions such as machining to can realize satisfying the preparation of the small-size sample of condition, overcome the difficult problem of wicresoft life-span aassessment, make the wicresoft stick sample can be pioneering be used for power station metal parts life-span aassessment of creativity.
Particularly, the utility model discloses a wicresoft tensile sample has overcome the restriction problem to sample machining dimension owing to saved the processing of tip screw thread, from this, the utility model discloses the sample size that processes out is littleer than traditional sample size, satisfies the manufacturing requirement more easily. In the embodiment, the diameter of the connecting part 1 of the processed minimally invasive tensile sample can reach 1-3mm, and the diameters of the first end part 2 and the second end part 3 can reach 2-6 mm. It can be seen that the minimum diameter of the processed connecting part 1 is 1mm, and the minimum diameters of the first end part 2 and the second end part 3 are 2mm, so that the processing size limitation of the traditional minimally invasive tensile test sample is broken through, correspondingly, the required sampling size is smaller in the process of carrying out tensile test research on the component, and the damage to the component caused by the minimally invasive evaluation method is avoided or greatly reduced. It should be noted that the processing length of wicresoft's tensile sample can be changed as required by adaptability, and the processing degree of difficulty is little, the utility model discloses do not do the restriction to this.
In addition, it should be noted that the radii of the first circular arc transition portion 4 and the second circular arc transition portion 5 are preferably set to be 2-10mm, so as to facilitate the processing and the smooth connection between the sample end portion and the connecting portion 1.
The utility model discloses a wicresoft's tensile sample is formed through cutting back wire-electrode cutting on the part that awaits measuring, processes out the tip by precision lathe afterwards, and last connecting portion and circular arc transition portion are handled by the grinding machine finish machining. After machining, the sample may be properly ground with # 1000 sandpaper to remove burrs and residual stresses generated during machining.
In order to facilitate the stretching of the sample and improve the overall connection strength of the sample, the first arc transition part 4 is arranged to face the axial direction indent of the connecting part 1, and the second arc transition part 5 is arranged to face the axial direction indent of the connecting part 1.
In addition, in order to ensure that the stress of the sample is uniform in the stretching process so as to obtain more accurate tensile test data, the minimally invasive tensile sample is of a symmetrical structure, and the first end part 2 and the second end part 3 are the same in size.
With reference to fig. 2 and 3, the second aspect of the present invention provides a minimally invasive tensile specimen clamp, the clamp is used for clamping any of the above schemes for minimally invasive tensile specimen, the clamp includes a first inner clamp 6 for clamping the first end portion 2 and a second inner clamp 7 for clamping the second end portion 3, the first inner clamp 6 and the second inner clamp 7 respectively include two clamp bodies 8 arranged in half and half, each of the clamp bodies 8 is provided with an inner groove 9 inside, the first inner clamp 6 has two clamp bodies 8 combined to form at least a cavity with the first end portion 2 and the first circular arc transition portion 4 matched first holding cavity, the second inner clamp 7 has two clamp bodies combined to form at least a cavity with the second end portion 3 and the second circular arc transition portion 5 matched second holding cavity.
Therefore, the utility model discloses a reduced the manufacturing dimension of wicresoft's tensile sample, among the tensile test process, abandoned stick sample threaded connection mode in the past completely, but adopt the mode of anchor clamps centre gripping sample to accomplish follow-up tensile action, through the mutual cooperation between anchor clamps and the sample two, the perfect problem of having solved current wicresoft's tensile sample size bigger than a wide margin, can prepare the total length even and be no longer than 10mm, shoulder diameter 2-6 mm's wicresoft tensile sample, this has cleared up the obstacle for the application of wicresoft's tensile sample in the wicresoft test aassessment field.
It should be noted that, because the inner clamp is composed of the clamp bodies 8 arranged in half, the inner clamp can be better matched with the shape of the end of the minimally invasive tensile sample, and compared with the integrally arranged clamp, the inner clamp is easy to adjust the position in the clamping process, so that a gap between the inner clamp and the clamping is avoided in the clamping process, the clamping of the minimally invasive tensile sample is convenient to realize, and the subsequent tensile action is convenient.
In addition, carry out the closed centre gripping of circumference to the sample through the anchor clamps body 8 of half setting for among the tensile test process, the atress of sample is more even, has overcome stress concentration's phenomenon, consequently, the utility model provides an anchor clamps not only are applicable to not unidimensional wicresoft tensile sample, still are applicable to the drawing of the standard jumbo size sample that can not pass through the screw thread centre gripping. And, the utility model discloses an anchor clamps easy operation only needs to change the anchor clamps body 8 of corresponding specification to the sample of different specifications can, has both reduced the processing cost of sample and anchor clamps, has improved test efficiency again.
It can be understood that, in order to improve the stability of clamping and facilitate subsequent stretching, the first accommodating cavity and the second accommodating cavity are preferably configured to also accommodate a part of the connecting part 1, so that the contact area between the inner clamp and the minimally invasive tensile sample can be increased, and the stability in the stretching process is ensured. In detail, the inner grooves 9 of the same inner fixture are combined to form a containing cavity in the shape of the end of the sample, namely, the first containing cavity and the second containing cavity, a thinner part in the containing cavity is matched with the connecting part 1, a transition part from the thinner part to the thicker part of the containing cavity is matched with the arc transition part, and the thicker part in the containing cavity is directly and tightly matched with the end.
The clamp body 8 can be set to be any suitable shape as long as the clamp body can be provided with an accommodating cavity so as to be matched and clamped with a minimally invasive tensile sample. Preferably, the clamp bodies 8 are wedge-shaped structures, the cross sections of the first inner clamp 6 and the second inner clamp 7 formed by combining the two clamp bodies 8 arranged in half are rectangular, and the length of the cross section of each inner clamp is gradually reduced along the direction from the end to the middle of the minimally invasive tensile test sample. Specifically, the inner clamp formed by combining the clamp bodies 8 is trapezoidal in front view shown in fig. 3, and rectangular in side view, that is, the width of the cross section of the inner clamp along the direction from the end to the middle of the minimally invasive tensile specimen is always constant, and the length of the inner clamp is gradually reduced.
In the stretching process, the two end parts of the minimally invasive tensile sample are clamped by the inner clamp and are stretched from the two end parts respectively, and therefore the clamp body 8 is set to be the wedge-shaped structure, the end parts of the minimally invasive tensile sample can be better clamped by the aid of the contraction effect of the wedge-shaped structure towards the middle part in the stretching process, and the clamping stability in the stretching process is guaranteed.
In the present embodiment, in order to adjust the positional relationship between the inner clamp and the end portion so as to be able to fit snugly therebetween during clamping, the inner groove 9 is provided to extend in the axial direction of the connecting portion 1. During the centre gripping, will half the fixture body 8 that sets up place at the sample tip and merge for the sample tip is located and holds intracavity portion, afterwards, because inner grove 9 sets up to extend along axial direction, consequently can adjust fixture body 8 along axial direction, makes the circular arc transition part that holds the chamber and the circular arc transition part of sample block each other mutually just, and close cooperation is convenient for improve tensile efficiency.
Simultaneously because the anchor clamps body 8 is half setting, after accomplishing the sample centre gripping, in order to guarantee anchor clamps body 8 stability, same two of interior anchor clamps can be through the perpendicular to after the anchor clamps body 8 merges the fixed mutually of inner groovy 9. Of course, the two clamp bodies 8 can also be fixed in other suitable ways to facilitate the subsequent stretching action.
As shown in fig. 4, specifically, each of the clamp bodies 8 is provided with a through hole perpendicular to the inner groove 9, and a pin hole 10 for inserting the fixing pin can be formed after the through holes of the two clamp bodies 8 of the same inner clamp are butted. Preferably, in the present embodiment, the inner groove 9 intersects with the pin hole 10.
With reference to fig. 5, in order to further complete the tensile test, the clamp of the minimally invasive tensile test specimen includes a first outer clamp 11 and a second outer clamp 12, a mounting cavity matched with the first inner clamp 6 in shape is provided in the first outer clamp 11, and a mounting cavity matched with the second inner clamp 7 in shape is provided in the second outer clamp 12.
Furthermore, a first pull rod 13 is fixed on the first outer clamp 11, a second pull rod 14 is fixed on the second outer clamp 12, and during the tensile test, the first end part 2 and the second end part 3 of the sample are respectively clamped by a first inner clamp 6 and a second inner clamp 7, the clamp body 8 of the inner clamp is fixed by the fixing pin, then the assembled inner clamp and the minimally invasive tensile sample are placed in the mounting cavity of the outer clamp, fixing the second pull rod 14 on the testing machine, starting the tensile testing machine, moving the first pull rod 13 upwards by using the upper cross beam of the testing machine, further driving the first outer clamp 11, the first inner clamp 6 and the first end part 2 to move upwards, as the second outer clamp 12 is fixed on the testing machine through the second pull rod 14, the minimally invasive tensile sample sequentially generates elastic deformation, plastic deformation, contraction and final instability fracture along with the test.
In the whole stretching process, relative motion is generated between the outer clamp and the inner clamp, and for explanation, because the inner clamp is of a wedge-shaped structure, along with the stretching process, the wedge-shaped part of the inner clamp is extruded by the outer clamp, so that the inner clamp can be well shrunk, and finally the end part of a minimally invasive stretching sample is tightly clamped, so that the stretching test can be better completed.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, makes up with any suitable mode including each concrete technical feature. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (10)
1. The minimally invasive tensile sample is characterized by comprising a connecting portion (1), a first end portion (2) and a second end portion (3), wherein the first end portion (2) and the second end portion (3) are respectively located at two ends of the connecting portion, the connecting portion (1), the first end portion (2) and the second end portion (3) are of cylindrical structures and coaxially arranged, the diameter of the connecting portion (1) is smaller than that of the first end portion (2) and that of the second end portion (3), the first end portion (2) and a first circular arc transition portion (4) arranged between the connecting portion (1) in the circumferential direction are connected, and the second end portion (3) and a second circular arc transition portion (5) arranged between the connecting portion (1) in the circumferential direction are connected.
2. The minimally invasive tensile specimen according to claim 1, wherein the connecting portion (1) has a diameter in the range of 1-3mm and the first and second end portions (2, 3) have a diameter in the range of 2-6 mm.
3. The minimally invasive tensile specimen according to claim 1, wherein the first circular arc transition portion (4) is provided so as to be concave toward the axial direction of the connecting portion (1), and the second circular arc transition portion (5) is provided so as to be concave toward the axial direction of the connecting portion (1).
4. The minimally invasive tensile specimen according to claim 1, wherein the minimally invasive tensile specimen is a symmetrical structure, and the first end portion (2) and the second end portion (3) are the same size.
5. A minimally invasive tensile specimen clamp, which is used for clamping the minimally invasive tensile specimen according to any one of claims 1 to 4, the clamp comprises a first inner clamp (6) for clamping the first end portion (2) and a second inner clamp (7) for clamping the second end portion (3), the first inner clamp (6) and the second inner clamp (7) respectively comprise two clamp bodies (8) arranged in half, an inner groove (9) is arranged in each clamp body (8), the two clamp bodies (8) of the first inner clamp (6) are combined to form a first accommodating cavity at least matched with the first end part (2) and the first arc transition part (4), and two clamp bodies of the second inner clamp (7) are combined to form a second accommodating cavity at least matched with the second end part (3) and the second arc transition part (5).
6. The clamp for the minimally invasive tensile specimen according to claim 5, wherein the clamp body (8) adopts a wedge-shaped structure, the cross section of the first inner clamp (6) and the second inner clamp (7) formed by combining the two clamp bodies (8) arranged in half is rectangular, and the length of the cross section of the inner clamp is gradually reduced along the direction from the end part to the middle part of the minimally invasive tensile specimen.
7. The clamp for minimally invasive tensile specimens according to claim 5, characterized in that the inner recess (9) is provided to extend in the axial direction of the connection portion (1).
8. The clamp for minimally invasive tensile specimens according to claim 7, wherein two clamp bodies (8) of the same inner clamp can be fixed together by a fixing pin perpendicular to the inner groove (9) after being combined.
9. The clamp for minimally invasive tensile specimens according to claim 8, wherein a through hole perpendicular to the inner groove (9) is formed in each clamp body (8), pin holes (10) for penetrating the fixing pins can be formed after the through holes of two clamp bodies (8) of the same inner clamp are butted, and the inner groove (9) and the pin holes (10) are arranged in an intersecting manner.
10. The clamp for the minimally invasive tensile specimen according to any one of claims 5 to 9, wherein the clamp for the minimally invasive tensile specimen comprises a first outer clamp (11) and a second outer clamp (12), a mounting cavity matched with the shape of the first inner clamp (6) is formed in the first outer clamp (11), and a mounting cavity matched with the shape of the second inner clamp (7) is formed in the second outer clamp (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920729967.1U CN210090190U (en) | 2019-05-20 | 2019-05-20 | Minimally invasive tensile sample and clamp thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920729967.1U CN210090190U (en) | 2019-05-20 | 2019-05-20 | Minimally invasive tensile sample and clamp thereof |
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| CN210090190U true CN210090190U (en) | 2020-02-18 |
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| CN201920729967.1U Active CN210090190U (en) | 2019-05-20 | 2019-05-20 | Minimally invasive tensile sample and clamp thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697619A (en) * | 2020-12-15 | 2021-04-23 | 上海交通大学 | Metal circulating loading device under ultrasonic vibration condition |
| CN114088528A (en) * | 2021-11-25 | 2022-02-25 | 太原理工大学 | Optimization method for small-size tensile sample of RPV steel |
-
2019
- 2019-05-20 CN CN201920729967.1U patent/CN210090190U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697619A (en) * | 2020-12-15 | 2021-04-23 | 上海交通大学 | Metal circulating loading device under ultrasonic vibration condition |
| CN114088528A (en) * | 2021-11-25 | 2022-02-25 | 太原理工大学 | Optimization method for small-size tensile sample of RPV steel |
| CN114088528B (en) * | 2021-11-25 | 2024-03-19 | 太原理工大学 | Small-size tensile sample optimization method for RPV steel |
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