CN103674694A - Long-time creep fixture - Google Patents
Long-time creep fixture Download PDFInfo
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- CN103674694A CN103674694A CN201310659618.4A CN201310659618A CN103674694A CN 103674694 A CN103674694 A CN 103674694A CN 201310659618 A CN201310659618 A CN 201310659618A CN 103674694 A CN103674694 A CN 103674694A
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Abstract
The invention provides a long-time creep fixture, comprising a cylindrical fixture body and two arc-segment-like seat covers with a same structure, wherein the cylindrical fixture body is connected with a tester and bears tensile load from the tester, two radial sides of the fixture body are respectively provided with a column (1) which has an arc-segment-like outer side surface, the inner side surface of each of the columns (1) is a plane perpendicular to the radial direction, the upper ends of the columns (1) are connected with the upper cover (2) of the fixture body so as to form an integral body, the upper part of the upper cover (2) is a solid cylinder (3) connected with the tester, the lower ends of the columns (1) are connected with a circular ring body (4) located at the bottom of the fixture body so as to form an integral body, each of the two arc-segment-like seat covers comprises a larger-diameter arc upper edge (5) and a smaller-diameter arc lower edge (6), and the arc upper edge (5) and the arc lower edge (6) are stagger and are connected through an arc cylinder, which enables the longitudinal section of the seat cover to form a zigzag shape. The long-time creep fixture prevents adhesion between the fixture and a specimen, realizes uniform loading and helps to reduce cost of testing.
Description
Technical field
The present invention is a kind of durable creeping clamp, belongs to mechanics performance testing technology field.
Background technology
As everyone knows, lasting and creep is for describing material, under hot conditions, to tolerate the performance of permanent load while growing.In order to obtain the lasting and creep strength of material, materials processing should be become to lasting and creep sample and pack into lasting and creep testing machine carries out lastingly and creep is tested.Lasting and creep testing machine is generally furnished with fixture for sample is fixed on testing machine.
Between lasting and creep sample and the fixture of routine, conventionally adopt the mode being threaded, with by screw thread by the load Transmit evenly applying the active section to sample.But there is the problem of high temperature bonding in this thread connecting mode.That is,, when at the temperature more than approximately 900 ℃, long time loading is tested, the phase counterdiffusion under high temperature load due to fixture and specimen surface atom, makes fixture and sample bond together by screw thread.This bonding causing cannot separate fixture and sample after test, thereby causes scrapping of fixture and significantly improving of testing cost.
In order to overcome the bonding problem of above-mentioned fixture and sample, a kind of shoulder type fixture connected mode is disclosed.There is the problem of unbalance stress in this shoulder type connected mode.It is unbalance that discontinuity causes loading alignment, thereby cause the measurement count of extensometer to differ large and depart from sample practical distortion amount.There is inhomogeneous distortion in the test of certain hour in this inhomogeneous stressed fixture that makes, and aggravates thus the discontinuity of sample in follow-up test afterwards.In addition, the clamp-replacing that the distortion of this fixture causes also increases testing cost.
Summary of the invention
For the problems referred to above of prior art, the present invention proposes a kind of durable creeping clamp, its objective is and prevents from bonding between fixture and sample from realizing uniform load and being conducive to reduce testing cost.
The object of the invention is to realize by following technical measures:
This kind of durable creeping clamp, is characterized in that, this fixture comprises:
One for being connected with testing machine and carrying the column jig main body from the tensile load of testing machine, this jig main body respectively has a lateral surface to be the column of arc section (1) in both sides radially, the medial surface of column (1) is the plane perpendicular to radially, the upper cover (2) of the upper end of column (1) and jig main body links into an integrated entity, the top of upper cover (2) is a solid cylinder being connected with testing machine (3), and the torus (4) of the lower end of column (1) and jig main body bottom links into an integrated entity;
The cover for seat of the arc section shape that two structures are identical, cover for seat has the less circular arc lower edge (6) of circular arc upper limb (5), arc section radius that arc section radius is larger, circular arc upper limb (5) and circular arc lower edge (6) stagger upper and lower, by arc cylindrical shell (7), connect between the two, make the longitudinal cross-section of cover for seat be "the" shape shape;
The cover for seat of two arc section shapes is arranged on the torus (4) between the column (1) of jig main body, circular arc upper limb (5) and circular arc lower edge (6) both ends of the surface are fitted with the medial surface of column (1) respectively, the medial surface laminating of the lateral surface of arc cylindrical shell (7) and torus (4), is fixedly connected with by pin (8) between circular arc upper limb (5) and torus (4).
Jig main body, cover for seat and pin (8) are made by high temperature alloy.
In the course of the work, circular arc upper limb (5) and circular arc lower edge (6) both ends of the surface are fitted with the medial surface of column (1) respectively, thereby transmit by circular arc upper limb (5) bottom the power being applied by jig main body, this power is delivered to circular arc lower edge (6) via the arc cylindrical shell (7) of cover for seat, and circular arc lower edge (6) contacts with sample (9) shoulder lower surface.
The advantage of technical solution of the present invention is: fixture of the present invention can make sample be subject to section to carry uniform load, thereby avoids the test figure causing due to unbalance stress in process of the test to lose efficacy.In addition, compare with jig main body, cover for seat is the member relatively little, manufacturing cost is lower.Because cover for seat replaces jig main body in process of the test, become the main member that fixture destroys, therefore, can avoid by only changing cover for seat the replacing of jig main body, thereby greatly reduce experimentation cost.And, by the fixation of pin, can remain face contact.
Except being applicable to lasting and creep test, the connection of dead load connecting elements when the present invention is also applicable to other high temperature length.
According to compact durable creeping clamp of the present invention, can realize the durable creeping test that test result is more accurate, cost is lower.
Accompanying drawing explanation
Fig. 1 be of the present invention in sample mated condition in the elevation cross-sectional view of embodiment of fixture
Fig. 2 is this cut-open view cutting along the line B-B line in Fig. 1
Fig. 3 is the elevation cross-sectional view of the cover for seat of embodiments of the invention
Fig. 4 is the top view of Fig. 3
Embodiment
Referring to drawings and Examples, technical solution of the present invention is further described:
As shown in Fig. 1～4, this fixture comprises:
One for being connected with testing machine and carrying the column jig main body from the tensile load of testing machine, this jig main body respectively has a lateral surface to be the column 1 of arc section in both sides radially, the medial surface of column 1 is the plane perpendicular to radially, the upper end of column 1 and the upper cover of jig main body 2 link into an integrated entity, the top of upper cover 2 is solid cylinders that are connected with testing machine 3, the torus 4 of the lower end of column 1 and jig main body bottom links into an integrated entity, and the medial surface of the inner edge surface of torus 4 and column 1 is tangent;
The cover for seat of the arc section shape that two structures are identical, cover for seat has the less circular arc lower edge 6 of circular arc upper limb 5, arc section radius that arc section radius is larger, circular arc upper limb 5 and circular arc lower edge 6 stagger upper and lower, by arc cylindrical shell 7, connect between the two, make the longitudinal cross-section of cover for seat be "the" shape shape;
The cover for seat of two arc section shapes is arranged on the torus 4 between the column 1 of jig main body, circular arc upper limb 5 and circular arc lower edge 6 both ends of the surface are fitted with the medial surface of column 1 respectively, the medial surface laminating of the lateral surface of arc cylindrical shell 7 and torus 4, is fixedly connected with by pin 8 between circular arc upper limb 5 and torus 4.
During test, by above-mentioned two groups of two ends that sample 9 is clamped respectively in fixture minute upper and lower position, imposed load, the load that fixture bears is uniformly distributed on jig main body, and pin 8 can make the stress of the surface of contact between circular arc upper limb 5 and torus 4 remain to be uniformly distributed.
Jig main body, cover for seat and pin 8 adopt equiax crystal high temperature alloy, crystallographic orientation high temperature alloy and single crystal super alloy to make, and can tolerate 1000 ℃ of above temperature.
Technical solution of the present invention compared with prior art, remains roughly close and be starkly lower than the stress distribution of the suffered stress of sample active section in the process of the test of each ingredient of fixture when long.Thereby, obviously extend the part replacement cycle of fixture and improve the performance test precision of material, and, overcome the problem of the high temperature bonding of the fixture that is threaded.
Claims (2)
1. a durable creeping clamp, is characterized in that: this fixture comprises:
One for being connected with testing machine and carrying the column jig main body from the tensile load of testing machine, this jig main body respectively has a lateral surface to be the column of arc section (1) in both sides radially, the medial surface of column (1) is the plane perpendicular to radially, the upper cover (2) of the upper end of column (1) and jig main body links into an integrated entity, the top of upper cover (2) is a solid cylinder being connected with testing machine (3), and the torus (4) of the lower end of column (1) and jig main body bottom links into an integrated entity;
The cover for seat of the arc section shape that two structures are identical, cover for seat has the less circular arc lower edge (6) of circular arc upper limb (5), arc section radius that arc section radius is larger, circular arc upper limb (5) and circular arc lower edge (6) stagger upper and lower, by arc cylindrical shell (7), connect between the two, make the longitudinal cross-section of cover for seat be "the" shape shape;
The cover for seat of two arc section shapes is arranged on the torus (4) between the column (1) of jig main body, circular arc upper limb (5) and circular arc lower edge (6) both ends of the surface are fitted with the medial surface of column (1) respectively, the medial surface laminating of the lateral surface of arc cylindrical shell (7) and torus (4), is fixedly connected with by pin (8) between circular arc upper limb (5) and torus (4).
2. according to the durable creeping clamp of claim 1, it is characterized in that: jig main body, cover for seat and pin (8) are made by high temperature alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310659618.4A CN103674694A (en) | 2013-12-09 | 2013-12-09 | Long-time creep fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310659618.4A CN103674694A (en) | 2013-12-09 | 2013-12-09 | Long-time creep fixture |
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| Publication Number | Publication Date |
|---|---|
| CN103674694A true CN103674694A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310659618.4A Pending CN103674694A (en) | 2013-12-09 | 2013-12-09 | Long-time creep fixture |
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| CN (1) | CN103674694A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926141A (en) * | 2014-04-21 | 2014-07-16 | 中南大学 | Fixture system for creep test |
| CN109030196A (en) * | 2018-08-18 | 2018-12-18 | 深圳阿尔泰克轻合金技术有限公司 | A kind of metal material single shaft creep resistant test sample, fixture and method |
| CN110044720A (en) * | 2019-03-11 | 2019-07-23 | 中国航发北京航空材料研究院 | A kind of multi-functional clamp suitable for nonstandard small sample creep performance test |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5531974A (en) * | 1978-08-30 | 1980-03-06 | Hitachi Metals Ltd | Test method for creep |
| CN101368893A (en) * | 2008-09-27 | 2009-02-18 | 北京六建集团公司 | Special fixture for curtain wall door and window metal heat insulation section bar tensile test |
| CN101718653A (en) * | 2009-12-21 | 2010-06-02 | 中国航空工业集团公司北京航空材料研究院 | Combined high-temperature and durable creeping clamp |
| CN102564850A (en) * | 2011-12-31 | 2012-07-11 | 广东步步高电子工业有限公司 | Mechanical property multidirectional testing fixture of double faced adhesive tape |
-
2013
- 2013-12-09 CN CN201310659618.4A patent/CN103674694A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5531974A (en) * | 1978-08-30 | 1980-03-06 | Hitachi Metals Ltd | Test method for creep |
| CN101368893A (en) * | 2008-09-27 | 2009-02-18 | 北京六建集团公司 | Special fixture for curtain wall door and window metal heat insulation section bar tensile test |
| CN101718653A (en) * | 2009-12-21 | 2010-06-02 | 中国航空工业集团公司北京航空材料研究院 | Combined high-temperature and durable creeping clamp |
| CN102564850A (en) * | 2011-12-31 | 2012-07-11 | 广东步步高电子工业有限公司 | Mechanical property multidirectional testing fixture of double faced adhesive tape |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926141A (en) * | 2014-04-21 | 2014-07-16 | 中南大学 | Fixture system for creep test |
| CN103926141B (en) * | 2014-04-21 | 2016-02-24 | 中南大学 | A kind of chucking appliance system for creep test |
| CN109030196A (en) * | 2018-08-18 | 2018-12-18 | 深圳阿尔泰克轻合金技术有限公司 | A kind of metal material single shaft creep resistant test sample, fixture and method |
| CN110044720A (en) * | 2019-03-11 | 2019-07-23 | 中国航发北京航空材料研究院 | A kind of multi-functional clamp suitable for nonstandard small sample creep performance test |
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Application publication date: 20140326 |
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