CN113959834A - CMC outer ring test piece clamp with low additional thermal stress - Google Patents
CMC outer ring test piece clamp with low additional thermal stress Download PDFInfo
- Publication number
- CN113959834A CN113959834A CN202111191884.XA CN202111191884A CN113959834A CN 113959834 A CN113959834 A CN 113959834A CN 202111191884 A CN202111191884 A CN 202111191884A CN 113959834 A CN113959834 A CN 113959834A
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- China
- Prior art keywords
- test piece
- outer ring
- cmc outer
- ring test
- cmc
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- 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.)
- Pending
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- 238000012360 testing method Methods 0.000 title claims abstract description 130
- 230000008646 thermal stress Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000002775 capsule Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000009863 impact test Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 102100040428 Chitobiosyldiphosphodolichol beta-mannosyltransferase Human genes 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011153 ceramic matrix composite Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- 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
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
-
- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
-
- 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
Abstract
The invention discloses a CMC outer ring test piece clamp with low additional thermal stress, and belongs to the technical field of gas turbine engines. Including thick pad, slider, spring and clamp bolt, be equipped with the inner chamber that runs through thick pad in thick pad for CMC outer loop test piece can all have abundant heat altered shape degree of freedom in radial, circumference and axial in the test process, lie in the horizontal both ends of inner chamber on the thick pad and seted up at least one bolt hole respectively, hold slider and spring in the bolt hole, during the installation CMC outer loop test piece, clamp bolt threaded connection is in the bolt hole, be used for compression spring to make the slider compress tightly CMC outer loop test piece. The CMC outer ring test piece clamp without additional thermal stress ensures the connection and positioning of the test piece in a cold state through line contact, and simultaneously ensures that the test piece has more sufficient thermal deformation freedom in the alternating high/low temperature gas impact test process. The clamp is simple in structural form, free of complex connecting or assembling structures and easy to machine.
Description
Technical Field
The invention belongs to the technical field of gas turbine engines, and particularly relates to a CMC outer ring test piece clamp with low additional thermal stress.
Background
The thermal expansion coefficient of the ceramic matrix composite (hereinafter referred to as CMC) is only 1/3 of that of a conventional metal material, the thermal deformation at the same temperature is 1/3 of that of the metal material, and because the thermal expansion coefficient of the CMC material is greatly different from that of the conventional metal, when rigid constraint is adopted, a large additional thermal stress is generated in a high-temperature test of the CMC outer ring test piece, so that the test piece is subjected to thermal fatigue damage, and the test purpose of checking the thermal shock resistance of the CMC outer ring test piece cannot be achieved.
The existing turbine outer ring test piece clamp adopts rigid connection such as bolts to fix the turbine outer ring test piece on the clamp, and the direct adoption of the structure can cause the CMC outer ring test piece and the clamp to generate large thermal stress under the high-temperature gas environment, possibly cause the test piece to be damaged in advance and cause test failure.
Disclosure of Invention
The invention aims to provide a CMC outer ring test piece clamp with low additional thermal stress, which aims at solving at least one aspect of the problems and defects in the prior art that the thermal deformation is not matched and the thermal stress cannot be completely released in the connecting structure of the turbine outer ring test piece clamp and the CMC outer ring test piece.
According to one aspect of the invention, the test device comprises a thick pad, a sliding block, a spring and a compression bolt, wherein an inner cavity penetrating through the thick pad is arranged in the thick pad and is used for enabling the CMC outer ring test piece to have sufficient thermal deformation freedom degrees in the radial direction, the circumferential direction and the axial direction in the test process;
at least one bolt hole is respectively formed in the two transverse ends of the inner cavity of the thick pad, a sliding block and a spring are accommodated in the bolt hole, and when the CMC outer ring test piece is installed, a pressing bolt is connected in the bolt hole in a threaded mode and used for compressing the spring to enable the sliding block to press the CMC outer ring test piece.
Further, the inner chamber includes the downside small circle arc section that upside circular arc section and two symmetries set up, and upside circular arc section is used for containing CMC outer loop test piece, and the both ends of upside circular arc section form the mounting groove with the downside small circle arc section for hold the both ends of CMC outer loop test piece, upside circular arc section radius is greater than the test piece radius, and inner chamber thickness direction is greater than the test piece width.
Furthermore, a supporting structure is arranged in the inner cavity, the cross section of the supporting structure is a closed structure consisting of a plurality of sections of circular arcs, and the inner space of the supporting structure is used as an air inlet channel.
Further, the support structure is located on the inner side of the upper side circular arc section and used for supporting the CMC outer ring test piece during testing, and the bolt hole is located on the outer side of the upper side circular arc section.
Furthermore, the upper side arc surface of the supporting structure is attached to the end surface of the exhaust side of the CMC outer ring test piece, and the lower side arc surface of the supporting structure is attached to the boundary of the bottom of the inner cavity.
Furthermore, two lower side small circular arc sections of the inner cavity are tangent to lower side arc surfaces at two ends of the supporting structure, the lower side small circular arc sections are matched with the sliding blocks to elastically fix the CMC outer ring test piece, and the circular arc bulges and the thick pad are integrally formed.
Further, the slider is half capsule form, and the arc surface one end of slider and the experimental butt of CMC outer loop, can be better with the experimental surface laminating of CMC outer loop.
Furthermore, the thick pad and the sliding block are both made of high-temperature-resistant nickel-based alloy.
Compared with the prior art, the invention has the beneficial effects that:
be equipped with the inner chamber that runs through thick pad in the thick pad, lie in the horizontal both ends of inner chamber on the thick pad and seted up at least one bolt hole respectively, hold slider and spring in the bolt hole, when installing CMC outer loop test piece, clamp bolt threaded connection is in the bolt hole for compression spring makes the slider compress tightly CMC outer loop test piece. Two ends of the CMC outer ring test piece extend out of the main flow channel, so that the test piece is prevented from oscillating greatly under the impact of high-speed airflow. The contact of the slider with the test piece, the small circular arc section of the downside of inner chamber and test piece is line contact, guarantees that the test piece possesses certain circumference and warp the degree of freedom.
The radius of the CMC outer ring test piece is slightly smaller than the radius of the arc section on the upper side of the inner cavity of the thick pad, and the CMC outer ring test piece is used for containing the radial thermal deformation of the test piece. When the CMC outer ring test piece is installed, the CMC outer ring test piece leans backwards against the bottom of the inner cavity of the thick cushion, and the test piece expands forwards when being heated. Certain gaps are reserved between the width of the test piece and the depth of the inner cavity of the thick pad for the test piece to freely expand axially. The CMC outer ring test piece clamp without additional thermal stress ensures the connection and positioning of the test piece in a cold state through line contact, and simultaneously ensures that the test piece has more sufficient thermal deformation freedom in the alternating high/low temperature gas impact test process.
The clamp is simple in structural form, free of complex connecting or assembling structures and easy to machine.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a fixture for a CMC outer ring test piece provided in an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic view of the cross-sectional structure A-A in FIG. 1;
FIG. 4 is a schematic structural view of a CMC turbine outer ring test piece of the present invention;
FIG. 5 is a schematic view of a gas thermal shock test apparatus provided in an embodiment of the present invention;
FIG. 6 is a schematic view of a test load spectrum of a CMC turbine outer ring provided by an embodiment of the present invention.
In the figure: 1. a thick pad; 101. a slider; 102. a spring; 103. a hold-down bolt; 104. an inner cavity; 105. an upper side arc section; 106. a support structure; 107. a lower small arc segment; 108. a screw hole; 2. a CMC outer ring test piece; 3. a combustion chamber; 4. a gas inlet transition section; 5. a test section; 6. a thermocouple; 7. and an exhaust transition section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are further described in detail below by way of examples with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention to a low parasitic thermal stress CMC outer ring test fixture.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
According to a general technical concept of the present invention, as shown in fig. 1-6, a CMC outer ring test fixture with low additional thermal stress is provided, which includes a thick pad 1, a slider 101, a spring 102 and a hold-down bolt 103, wherein an inner cavity 104 penetrating through the thick pad 1 is provided in the thick pad 1, and is used for enabling the CMC outer ring test fixture 2 to have sufficient thermal deformation freedom in radial direction, circumferential direction and axial direction during a test process;
at least one bolt hole is respectively formed in the two transverse ends of the inner cavity 104 of the thick pad 1, the sliding block 101 and the spring 102 are accommodated in the bolt holes, and when the CMC outer ring test piece 2 is installed, the pressing bolt 103 is connected in the bolt hole in a threaded mode and used for compressing the spring 102 to enable the sliding block 101 to press the CMC outer ring test piece 2. Two ends of the CMC outer ring test piece 2 extend out of the main flow channel, and a sliding block 101 pressed by a spring 102 is fixed on the thick pad 1, so that the test piece is prevented from greatly oscillating under the impact of high-speed airflow. The contact of the slider 101 with the test piece, the small circular arc section 107 of the lower side of the inner cavity 104 and the test piece is line contact, and the test piece is guaranteed to have a certain degree of freedom of circumferential deformation. The radius of the CMC outer ring test piece 2 is slightly smaller than the radius of an upper side circular arc section 105 of an inner cavity 104 of the thick cushion 1, and the CMC outer ring test piece is used for containing the radial thermal deformation of the test piece. The CMC outer ring test piece 2 is installed against the back of the inner cavity 104 of the thick mat 1 and the test piece expands forward when heated. Certain gaps are left between the width of the test piece and the depth of the inner cavity 104 of the thick cushion 1, so that the test piece can freely expand axially.
Two lower side small circular arc sections 107 of the inner cavity 104 are tangent to lower side arc surfaces at two ends of the supporting structure 106, the lower side small circular arc sections 107 are matched with the sliding block 101 to elastically fix the CMC outer ring test piece 2, and the lower side small circular arc sections 107 and the thick pad 1 are integrally formed.
The slider 101 is half capsule form, and the arc surface one end of slider 101 and the experimental 2 butt of CMC outer ring, even some slight deviation of the experimental installation of CMC outer ring, also can guarantee slider 101 and the 2 surface laminating of CMC outer ring experimental.
The thick pad 1 is made of high-temperature-resistant nickel-based alloy, and preferably, the material of the thick pad 1 is GH 3128.
The sliding block 101 is made of high-temperature-resistant nickel-based alloy, and preferably, the material of the thick pad 1 is GH 3128.
As shown in fig. 4, the examination part of the CMC outer ring test piece 2 simulates a turbine outer ring structure, and the thickness of the CMC outer ring test piece 2 is equivalent to that of a real turbine outer ring, and the radius of the CMC outer ring test piece 2 is slightly smaller than that of the upper circular arc section 105. The inner arc surface of the outer ring of the turbine is a gas scouring surface, and the test piece is heated/cooled by test gas on the corresponding inner arc surface. The radius of the CMC outer ring test piece 2 approaches to the outer diameter of the runner surface of the switching section, and two ends of the CMC outer ring test piece 2 extend for a distance along the circumferential direction, so that the CMC outer ring test piece is convenient to clamp on a non-runner surface.
As shown in fig. 5, the gas thermal shock test device comprises a combustion chamber 3, an air inlet transition section 4, a test section 5, a test piece clamp and an exhaust transition section 7 which are sequentially arranged, wherein the test piece clamp is fixed on the test device through a plurality of screw holes 108 formed in a thick pad 1, and the gas thermal shock test device is mainly used for rapidly heating/cooling a CMC outer ring test piece 2 in the test section 5 through alternating high/low temperature gas. In the test process, high-temperature gas generated by the combustion chamber 3 is adopted to directly heat the test piece during temperature rise, so that the temperature of the test piece quickly reaches the test temperature and is stabilized at the highest temperature, and the test piece is ensured to be thoroughly heated at constant temperature; and during temperature reduction, the test piece is cooled by using gas at a lower temperature, and then the temperature of the test piece is continuously reduced by adopting a cold blowing mode. The test temperature is measured by a thermocouple 6 installed right in front of the test piece, and the test cycle number and test data are automatically acquired by a computer.
The service load under the working condition of the CMC turbine outer ring is simulated, the test load spectrum of the CMC turbine outer ring is designed as shown in FIG. 6, the test temperature range is 250-980 ℃, the single cycle time is 86 seconds, and corresponding increase and decrease are actually carried out according to the test device.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The CMC outer ring test piece clamp with low additional thermal stress is characterized by comprising a thick pad (1), a sliding block (101), a spring (102) and a pressing bolt (103), wherein an inner cavity (104) penetrating through the thick pad (1) is arranged in the thick pad (1) and is used for ensuring that the CMC outer ring test piece (2) has sufficient thermal deformation freedom degrees in the radial direction, the circumferential direction and the axial direction in the test process;
at least one bolt hole is respectively formed in the two transverse ends of the inner cavity (104) of the thick pad (1), a sliding block (101) and a spring (102) are accommodated in the bolt hole, and when the CMC outer ring test piece (2) is installed, a pressing bolt (103) is connected in the bolt hole in a threaded mode and used for compressing the spring (102) to enable the sliding block (101) to press the CMC outer ring test piece (2).
2. The CMC outer ring test fixture with low additional thermal stress as claimed in claim 1, wherein the inner cavity (104) comprises an upper side circular arc section (105) and two symmetrically arranged lower side small circular arc sections (107), the upper side circular arc section (105) is used for containing the CMC outer ring test piece (2), and two ends of the upper side circular arc section (105) and the lower side small circular arc sections (107) form mounting slots for containing two ends of the CMC outer ring test piece (2).
3. The CMC outer ring test fixture with low additional thermal stress as claimed in claim 2, wherein a support structure (106) is arranged in the inner cavity (104), the cross section of the support structure (106) is a closed structure composed of a plurality of circular arcs, and the inner space of the support structure (106) is used as an air inlet channel.
4. The CMC outer ring test fixture with low additional thermal stress of claim 3, wherein the support structure (106) is located inside the upper circular arc segment (105) and the bolt hole is located outside the upper circular arc segment (105).
5. The CMC outer ring test piece clamp with low additional thermal stress as claimed in claim 4, wherein the upper circular arc surface of the support structure (106) is attached to the exhaust side end surface of the CMC outer ring test piece (2), and the lower circular arc surface of the support structure (106) is attached to the bottom boundary of the inner cavity (104).
6. The CMC outer ring test piece clamp with low additional thermal stress as claimed in claim 2, wherein two lower small arc sections (107) of the inner cavity (104) are tangent to lower arc surfaces at two ends of the supporting structure (106), and the lower small arc sections (107) cooperate with the sliding block (101) to elastically fix the CMC outer ring test piece (2).
7. The CMC outer ring test piece clamp with low additional thermal stress as claimed in claim 6, wherein the slide block (101) is in a half capsule shape, and one end of the arc surface of the slide block (101) is abutted with the CMC outer ring test piece (2).
8. The CMC outer ring test piece clamp with low additional thermal stress as claimed in claim 1, wherein the thick pad (1) and the sliding block (101) are both made of high temperature resistant nickel-based alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191884.XA CN113959834A (en) | 2021-10-13 | 2021-10-13 | CMC outer ring test piece clamp with low additional thermal stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191884.XA CN113959834A (en) | 2021-10-13 | 2021-10-13 | CMC outer ring test piece clamp with low additional thermal stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113959834A true CN113959834A (en) | 2022-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111191884.XA Pending CN113959834A (en) | 2021-10-13 | 2021-10-13 | CMC outer ring test piece clamp with low additional thermal stress |
Country Status (1)
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|---|---|
| CN (1) | CN113959834A (en) |
Citations (13)
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|---|---|---|---|---|
| US5512727A (en) * | 1994-03-24 | 1996-04-30 | General Electric Company | Hot grip assembly |
| CN101716620A (en) * | 2009-11-30 | 2010-06-02 | 国营北京曙光电机厂 | Bending fixture for motor winding elements |
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-
2021
- 2021-10-13 CN CN202111191884.XA patent/CN113959834A/en active Pending
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