CN110823682A - Clamp for ultrahigh-temperature creep test - Google Patents
Clamp for ultrahigh-temperature creep test Download PDFInfo
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- CN110823682A CN110823682A CN201911071251.8A CN201911071251A CN110823682A CN 110823682 A CN110823682 A CN 110823682A CN 201911071251 A CN201911071251 A CN 201911071251A CN 110823682 A CN110823682 A CN 110823682A
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- shaped base
- connecting hole
- temperature creep
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- 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
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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- 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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0458—Chucks, fixtures, jaws, holders or anvils characterised by their material
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A fixture for ultra-high temperature creep testing, comprising: two connecting pieces (1) and two U-shaped bases (2); the U-shaped base (2) comprises two side walls (21) which are arranged in parallel and a cross arm (22) connected between the two side walls (21), the openings of the two U-shaped bases (2) are opposite, and the two cross arms (22) are vertical to each other; one end of each of the two connecting pieces (1) is detachably connected with the opening of each of the two U-shaped bases (2), and the other end of each of the two connecting pieces (1) is arranged on the high-temperature creep device. The material has good high-temperature comprehensive performance and excellent thermal fatigue performance, and can exert stable load on a tested sample for a very long time under the condition of more than 1000 ℃; and meanwhile, the external compressive stress applied to the tested sample can be directly calculated according to the tensile stress at the two ends of the clamp, and the result is accurate and reliable.
Description
Technical Field
The invention relates to the technical field of high-temperature creep, in particular to a clamp for an ultrahigh-temperature creep test.
Background
The high-temperature creep refers to the phenomenon that a metal material slowly generates plastic deformation under the long-term action of constant temperature and constant load. Under high temperature conditions, creep has a significant effect on the component. Due to different stress applying modes, the stress applying modes can be divided into high-temperature compression creep, high-temperature tensile creep, high-temperature bending creep and high-temperature torsion creep. The high-temperature creep ratio high-temperature strength can effectively indicate the strain tendency and the fracture life of the material when the material is used at high temperature for a long time, is one of the important mechanical properties of the material, and is related to the material and the structural characteristics of the material.
The high-temperature creep property is an important index for evaluating the mechanical property of a material, a mature experimental method is provided for high-temperature tensile creep and high-temperature compressive creep experiments of the material at home, corresponding national standards are established, high-temperature tensile creep and high-temperature compressive creep experimental equipment is infinite in the market at present, but a compressive creep device and a tensile creep device which are used for more than 1000 ℃ do not exist at present, and the material of the current compressive creep device is hard alloy and can only be used for the compressive creep experiment at the temperature of below 800 ℃.
Disclosure of Invention
Objects of the invention
The invention aims to provide a clamp for an ultrahigh temperature creep test, which is made of DZ22 material and DZ125 material, so that the clamp can perform the high temperature compression creep test in an environment of more than 1000 ℃.
(II) technical scheme
In order to solve the above problems, according to one aspect of the present invention, there is provided a jig for ultra high temperature creep test, comprising: two connecting pieces and two U-shaped bases; the U-shaped base comprises two side walls which are arranged in parallel and a cross arm connected between the two side walls, the openings of the two U-shaped bases are opposite, and the two cross arms are vertical to each other; one end of each connecting piece is detachably connected with the opening of each U-shaped base, and the other end of each connecting piece is installed on the high-temperature creep device.
Furthermore, a first connecting hole is formed in the position, close to the opening of the U-shaped base, of the side wall, and a second connecting hole is formed in one end of the connecting piece and corresponds to the first connecting hole; the pin penetrates through the first connecting hole and the second connecting hole in sequence, so that the connecting piece is detachably connected with the U-shaped base.
Further, the connector includes: the first connecting part and the second connecting part are fixedly connected; the first connecting part is a cylindrical threaded connecting piece and is detachably connected to a pull rod of the high-temperature creep device; the second connecting portion can be dismantled with U type base and be connected, and the second connecting hole sets up on the second connecting portion.
Further, the connecting piece, the U-shaped base and the pin are made of DZ125 materials.
Furthermore, the pull rod of the high-temperature creep device is made of DZ22 material.
Further, the formula of the applied compressive stress applied to the tested sample is as follows:
σ＝F/N；
wherein, σ is the external compressive stress applied on the tested sample, F is the tensile force applied on the connecting piece, and N is the stress area of the tested sample. .
Further, the thread of the first connection portion is manufactured with a 6g precision; the coaxiality of the thread center of the first connecting part and the first connecting part is not more than 0.01 mm.
Furthermore, the coaxiality of the pull rod and the first connecting part is not more than 0.05mm, and the pull rod and the first connecting part have interchangeability.
Furthermore, the axis of the second connecting hole is vertically intersected with the central line of the longitudinal axis of the first connecting hole, and the displacement degree and the verticality are not more than 0.05 mm; the perpendicularity of the axis of the second connecting hole to the two planes of the groove exceeds 0.05 mm.
Furthermore, the parallelism of the two side walls of the U-shaped base to the center of the longitudinal axis of the U-shaped base is not more than 0.1mm in the full-length range; the symmetry planes of the two side walls of the U-shaped base are coincident with the central line of the longitudinal axis of the U-shaped base, and the displacement degree exceeds 0.05 mm.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
the structure is simple, and the installation and the use are easy;
the high-temperature tensile creep clamp is made of DZ22 material, the high-temperature compressive creep clamp is made of DZ125 material, the high-temperature tensile creep clamp has good high-temperature comprehensive performance and excellent thermal fatigue performance, and can exert stable load on a tested sample for a very long time under the condition of more than 1000 ℃;
the external compressive stress applied to the tested sample can be directly calculated according to the tensile stress at the two ends of the clamp, and the result is accurate and reliable.
Drawings
FIG. 1 is a structural diagram of a fixture for ultra-high temperature creep test provided by the invention;
FIG. 2 is a cross-sectional view of the fixture for ultra-high temperature creep test provided by the present invention;
FIG. 3 is a perspective view of the fixture for ultra-high temperature creep test provided by the present invention;
FIG. 4 is a structural diagram of a U-shaped base of the fixture for the ultra-high temperature creep test, provided by the invention;
FIG. 5 is a structural view of a connecting part of the fixture for ultra-high temperature creep test provided by the present invention;
FIG. 6 is a dimensional view of a connection piece of an embodiment of the fixture for ultra-high temperature creep testing provided by the present invention;
FIG. 7 is a dimensional diagram of a U-shaped base of an embodiment of the fixture for the ultra-high temperature creep test provided by the invention.
Reference numerals:
1-a connector; 2-U-shaped base; 3-a pin; 11-a second connection hole; 12-a first connection; 13-a second connection; 14-a gasket; 21-a side wall; 22-a crossbar; 23-first connection hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Fig. 1 is a structural view of a jig for an ultra-high temperature creep test according to the present invention, fig. 2 is a sectional view of the jig for an ultra-high temperature creep test according to the present invention, and fig. 3 is a perspective view of the jig for an ultra-high temperature creep test according to the present invention.
The invention provides a clamp for an ultrahigh-temperature creep test, which comprises: two connecting pieces 1 and two U-shaped bases 2; the U-shaped base 2 comprises two side walls 21 arranged in parallel and a cross arm 22 connected between the two side walls 21, the openings of the two U-shaped bases 2 are opposite, and the two cross arms 22 are vertical to each other; one end of two connecting pieces 1 can be dismantled with the opening of two U type bases 2 respectively and be connected, and the other end of two connecting pieces 1 is installed on high temperature creep device.
Optionally, the U-shaped base 2 is formed by bending a rectangle with a rectangular cross section, or is formed by welding the cross arm 22 and the two side walls 21, wherein one end of each of the two parallel side walls 21 is open, and the other end is connected with the cross arm 22.
When the clamp is used, each part in the clamp is in a split state, the openings of the two U-shaped bases 2 are opposite, the planes of the two cross arms 22 are perpendicular to each other, a sample to be measured is placed between the planes of the two cross arms 22, and then other parts of the clamp are combined. And finally, connecting the two connecting pieces 1 to a pull rod of a high-temperature creep device respectively to perform a compression creep test.
Specifically, when carrying out high temperature tensile creep test, directly install the both ends of being surveyed the sample on the pull rod of high temperature creep device, act on the pull rod of high temperature creep device pulling force, the both ends of being surveyed the sample receive opposite direction's pulling force this moment to the sample of being surveyed is stretched to this, reaches tensile creep's effect.
Preferably, be connected with the sleeve on the pull rod of high temperature creep device, this sleeve is cavity, and inside is provided with the internal thread, and the both ends of being surveyed the sample form with telescopic internal thread assorted screw assembly to the both ends that will be surveyed the sample respectively with sleeve threaded connection.
Optionally, the sample to be tested and the sleeve can be connected by a buckle.
When a high-temperature compression creep test is carried out, a tested sample is placed between the two cross arms 22 of the two U-shaped bases 2, then the clamp is combined, and finally the combined clamp with the tested sample is arranged on a pull rod of a high-temperature creep device. The tensile force acts on the pull rod of the high-temperature creep device, at the moment, the two cross arms 22 respectively receive the tensile force in the opposite directions and are close to each other, so that a tested sample arranged between the two cross arms 22 is extruded and receives compressive stress, and the tensile stress is converted into the compressive stress by applying the tensile stress, so that the effect of compressive creep is achieved.
In one embodiment, a first connection hole 23 is formed in the side wall 21 at a position close to the opening of the U-shaped base 2, a second connection hole 11 is formed at one end of the connection member 1, and the second connection hole 11 corresponds to the first connection hole 23; the pin 3 passes through the first connecting hole 23 and the second connecting hole 11 in sequence, so that the connecting piece 1 is detachably connected with the U-shaped base 2.
Specifically, connecting piece 1 not only can connect and fix two mutually perpendicular and the opposite U type base 2 of opening, can also fix whole anchor clamps, makes it not squint the direction when receiving tensile stress in the use, and more accurate compression is tested the appearance, improves compression quality and degree of accuracy.
In one embodiment, the connector 1 comprises: a first connection portion 12 and a second connection portion 13 fixedly connected; the first connecting part 12 is a cylindrical threaded connecting piece and is detachably connected to a pull rod of the high-temperature creep device; the second connecting portion 13 is provided with a second connecting hole 11.
Specifically, the second connecting portion 13 is used for connecting and fixing the U-shaped base 2; the cylindrical threaded connecting piece is matched with a sleeve connected with a pull rod of the high-temperature creep device so as to fix the clamp on the high-temperature creep device.
In one embodiment, the connector 1, the U-shaped base 2, and the pin 3 are made of DZ125 material.
In one embodiment, the tie rods of the high temperature creep device are made of DZ22 material.
Specifically, the material can enable a sample to be tested to be subjected to a high-temperature tensile or compressive creep test in an environment with the temperature of more than 1000 ℃, and a clamp made of the material is long in service life and not easy to break; and the device is not easy to deform in the working process, and has high stretching or compressing accuracy and good quality.
In one embodiment, the applied compressive stress on the sample under test is calculated by the formula:
σ＝F/N；
wherein, σ is the external compressive stress applied on the tested sample, F is the tensile force applied to the two ends of the connecting piece 1, and N is the stress area of the tested sample.
Specifically, when a high-temperature tensile creep test is carried out, the two ends of a tested sample are subjected to external tensile stress; when a high-temperature compression creep test is carried out, a tested sample is subjected to compressive stress converted from external tensile stress. At the moment, the tensile stress applied to the two ends of the two connecting pieces 1 of the clamp is the external compressive stress applied to the sample to be measured; the contact area between the plane of the cross arm 22 of the two U-shaped bases 2 and the tested sample is the stress area of the tested sample.
The clip of the present application is illustrated by the following examples.
Example (b):
fig. 6 is a dimensional view of a connecting member 1 of an embodiment of the jig for the ultra-high temperature creep test provided by the present invention, and fig. 7 is a dimensional view of a U-shaped base 2 of an embodiment of the jig for the ultra-high temperature creep test provided by the present invention. See fig. 6 and 7, where the units are in millimeters. The first connection portion 12 is a stud having an outer diameter of M18, and is 60mm long, and the screw thread of the first connection portion 12 is manufactured with a 6g precision. In order to ensure the precision of the compression test and prevent the clamp from shifting in the using process, the coaxiality of the thread center of the first connecting part 12 and the first connecting part 12 is not more than 0.01 mm.
Preferably, the coaxiality of the sleeve on the pull rod and the first connecting part 12 is not more than 0.05mm, and the pull rod has interchangeability, so that the pull rod can adapt to different tested samples.
Preferably, the second connection portion 13 is a cube, the diameter of the second connection hole 11 is 8.5mm, and the center of the second connection hole 11 is disposed at the center of the cube. The first connection hole 23 has the same diameter as the second connection hole 11 and is provided on the side wall 21 at a distance of 15mm from the opening position. The axis of the second connecting hole 11 is vertically intersected with the longitudinal axis center line of the first connecting hole 23, and the installation precision is ensured, and the displacement degree and the verticality are not more than 0.05 mm; the perpendicularity of the axis of the second connecting hole 11 to the two planes of the groove exceeds 0.05 mm.
Preferably, the parallelism of the two side walls 21 of the U-shaped base 2 to the longitudinal axis center thereof is not more than 0.1mm over the entire length; the symmetry plane of the two side walls 21 of the U-shaped base 2 should coincide with the center line of the longitudinal axis thereof with a degree of displacement exceeding 0.05 mm.
The above parameters and precision requirements ensure that the clamp and the tested sample do not have position deviation in the process of applying stress to the tested sample, and the tested sample is ensured to receive accurate pressure stress in the test process. Meanwhile, the accuracy and reliability of the finally calculated compressive stress can be ensured.
The invention aims to protect a clamp for an ultrahigh-temperature creep test, which comprises: two connecting pieces 1 and two U-shaped bases 2; the U-shaped base 2 comprises two side walls 21 arranged in parallel and a cross arm 22 connected between the two side walls 21, the openings of the two U-shaped bases 2 are opposite, and the two cross arms 22 are vertical to each other; one end of two connecting pieces 1 can be dismantled with the opening of two U type bases 2 respectively and be connected, and the other end of two connecting pieces 1 is installed on high temperature creep device. The structure is simple, and the installation and the use are easy; the high-temperature tensile creep clamp is made of DZ22 material, the high-temperature compressive creep clamp is made of DZ125 material, the high-temperature tensile creep clamp has good high-temperature comprehensive performance and excellent thermal fatigue performance, and can exert stable load on a tested sample for a very long time under the condition of more than 1000 ℃; the external compressive stress applied to the tested sample can be directly calculated according to the tensile stress at the two ends of the clamp, and the result is accurate and reliable.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A clamp for ultra-high temperature creep test, comprising: two connecting pieces (1) and two U-shaped bases (2);
the U-shaped base (2) comprises two side walls (21) which are arranged in parallel and a cross arm (22) connected between the two side walls (21), the openings of the two U-shaped bases (2) are opposite, and the two cross arms (22) are perpendicular to each other;
one end of each of the two connecting pieces (1) is detachably connected with the opening of the corresponding U-shaped base (2), and the other end of each of the two connecting pieces (1) is installed on the high-temperature creep device.
2. The clamp of claim 1,
a first connecting hole (23) is formed in the position, close to the opening of the U-shaped base (2), of the side wall (21), a second connecting hole (11) is formed in one end of the connecting piece (1), and the second connecting hole (11) corresponds to the first connecting hole (23);
the pin (3) sequentially penetrates through the first connecting hole (23) and the second connecting hole (11), so that the connecting piece (1) is detachably connected with the U-shaped base (2).
3. The clamp according to claim 1, characterized in that said connecting element (1) comprises: a first connecting part (12) and a second connecting part (13) which are fixedly connected;
the first connecting part (12) is a cylindrical threaded connecting piece and is detachably connected to a pull rod of the high-temperature creep device;
the second connecting portion (13) is detachably connected with the U-shaped base (2), and the second connecting hole (11) is formed in the second connecting portion (13).
4. The clamp of claim 1,
the connecting piece (1), the U-shaped base (2) and the pin (3) are made of DZ125 materials.
5. The clamp of claim 1,
the pull rod of the high-temperature creep device is made of DZ22 material.
6. The jig of claim 1, wherein the applied compressive stress on the sample under test is calculated by the formula:
σ＝F/N；
wherein, sigma is the applied compressive stress applied on the tested sample, F is the tensile force applied on the connecting piece (1), and N is the stress area of the tested sample.
7. The clamp of claim 4,
the thread of the first connection (12) is made with a 6g precision;
the coaxiality of the thread center of the first connecting part (12) and the first connecting part (12) is not more than 0.01 mm.
8. The clamp of claim 1,
the coaxiality of the pull rod and the first connecting part (12) is not more than 0.05mm, and the pull rod and the first connecting part have interchangeability.
9. The clamp of claim 1,
the axis of the second connecting hole (11) is vertically intersected with the longitudinal axis center line of the first connecting hole (23), and the displacement degree and the verticality are not more than 0.05 mm;
the perpendicularity of the axis of the second connecting hole (11) to the two planes of the groove exceeds 0.05 mm.
10. The clamp of claim 1,
the parallelism of the two side walls (21) of the U-shaped base (2) to the longitudinal axis center thereof is not more than 0.1mm in the whole length range;
the symmetry planes of the two side walls (21) of the U-shaped base (2) are coincident with the center line of the longitudinal axis of the U-shaped base, and the displacement degree exceeds 0.05 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911060637 | 2019-11-01 | ||
| CN2019110606379 | 2019-11-01 |
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| CN110823682A true CN110823682A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911071251.8A Pending CN110823682A (en) | 2019-11-01 | 2019-11-05 | Clamp for ultrahigh-temperature creep test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447367A (en) * | 2021-06-21 | 2021-09-28 | 广东省科学院工业分析检测中心 | Device for detecting creep property of heat insulation section bar and detection method thereof |
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| 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 |
| CN109916712A (en) * | 2019-03-26 | 2019-06-21 | 南方科技大学 | Synchronous sample anchor clamps of tensile and compression and creep testing machine |
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| CN113447367A (en) * | 2021-06-21 | 2021-09-28 | 广东省科学院工业分析检测中心 | Device for detecting creep property of heat insulation section bar and detection method thereof |
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