CN115014946A - Ceramic matrix composite high-temperature tensile fixture tool and test method thereof - Google Patents
Ceramic matrix composite high-temperature tensile fixture tool and test method thereof Download PDFInfo
- Publication number
- CN115014946A CN115014946A CN202210814822.8A CN202210814822A CN115014946A CN 115014946 A CN115014946 A CN 115014946A CN 202210814822 A CN202210814822 A CN 202210814822A CN 115014946 A CN115014946 A CN 115014946A
- Authority
- CN
- China
- Prior art keywords
- wedge
- sample piece
- chuck
- temperature
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- 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 ceramic matrix composite material high temperature tensile fixture frock and its test method, the fixture frock adopts the design that the chuck does not contact the test piece directly, divide the apparatus into water-cooling non-contact part and contact part, under the water-cooling effect, the water-cooling contact part of the chuck is difficult to damage because of the high temperature; the clamping heads can be arranged outside the high-temperature furnace in a clamping mode of the clamping heads on the two sides, so that the possibility of damaging the tool at high temperature is further reduced; the clamping block is adopted to clamp the test piece, so that even if the test piece is damaged at high temperature due to water cut-off accidents, the test can still be continuously carried out due to insensitivity of the clamping block to high-temperature deformation and connection and fixation of the separation blade, and the test result cannot be greatly influenced; when the damage happens, only the clamping block and the gasket are replaced generally, so that the device is more economical.
Description
Technical Field
The invention relates to the field of material engineering experiments, in particular to a ceramic matrix composite high-temperature tensile fixture tool and a test method thereof.
Background
As a novel composite material, the ceramic matrix composite material is a composite taking a ceramic material as a matrix and ceramic fibers, whiskers, particles and the like as reinforcements. The material can still maintain good mechanical properties in a high-temperature environment, plays an important role in the national defense industry fields of aerospace, nuclear industry and the like, and therefore, mechanical property tests of various ceramic matrix composite materials in a high-temperature environment (more than 800 ℃) are also needed so as to obtain accurate mechanical property data and further guide the structural design of the ceramic matrix composite materials. When a high-temperature tensile test is carried out, one end of a plate-shaped workpiece needs to be fixedly clamped, and a tensile force is applied to the other end of the plate-shaped workpiece.
The existing fixed clamping mechanism structurally comprises: the connecting piece is arranged on the cylindrical body and connected with the external fixed end, the gaskets which can be pulled out and inserted are arranged, the plate-shaped workpieces with different thicknesses are subjected to tensile test, and the positioning pin shafts are matched with the positioning through holes to fix the plate-shaped workpieces in the grooves.
The scheme that prior art adopted, the structure is too simple, what probably appears in the high temperature test process was not considered, and the high temperature leads to the condition that the chuck lax warp even damage, and the test fails under this condition, and the test result is unreliable, damages more to need to replace whole device when replacing simultaneously, consumes with high costs.
Therefore, how to improve the experimental equipment, avoid the deformation damage problem of chuck under high temperature environment, improve the convenience of equipment change, reduce cost becomes the technical problem that needs to solve urgently.
Disclosure of Invention
The invention aims to provide a ceramic matrix composite high-temperature tensile fixture tool and a test method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a tensile anchor clamps frock of ceramic matrix composite high temperature which characterized in that includes:
the water-cooling non-contact part and the contact part, wherein the water-cooling non-contact part clamps and fixes the sample piece through the contact part;
the contact portion includes: two wedge-shaped clamping blocks and a positioning pin;
the wedge-shaped clamping blocks are symmetrically arranged on two sides of the sample piece clamping section, the clamping working surface is opposite to the sample piece, the inclined plane has a certain angle, so that the sample piece is symmetrically clamped and forms mechanical self-locking, and a positioning pin through hole is designed at a position corresponding to a sample piece positioning hole;
the positioning pin is matched with the positioning hole of the sample piece and penetrates through the positioning pin through holes of the wedge-shaped clamping blocks on the two sides;
the water-cooling non-contact part comprises a pull rod, a chuck, two positioning baffle plates and a water-cooling channel,
the pull rod is fixed at the upper part of the chuck and is used for being connected with the loading framework;
the middle part of the chuck is provided with a symmetrical inclined plane wedge-shaped structure, the wedge-shaped structure is wide at the top and narrow at the bottom and is matched with the inclined plane of the wedge-shaped clamping block, so that a sample piece is clamped and loaded after the inclined plane with a self-locking anti-loosening angle is matched with the wedge-shaped clamping block in the stretching process;
the two positioning blocking pieces are fixed on the front side and the back side of the chuck, so that after the water-cooling non-contact part clamps and fixes the sample piece through the contact part, the contact part and the sample piece are fixedly blocked from the front side and the back side;
and two side walls of the symmetrical inclined plane wedge-shaped structure of the chuck are provided with water cooling channels, and the water cooling channels are provided with cooling water connection nozzles.
Optionally, the contact portion further includes two high-temperature metal gaskets, the two high-temperature metal gaskets are symmetrically attached to two sides of the clamping section of the sample piece, clamped between the clamping working surface of the wedge-shaped clamping block and the sample piece, and a pin through hole is formed in the center of the contact portion corresponding to the position of the positioning pin.
Optionally, the included angle of the inclined plane of each wedge-shaped clamping block is 6-8 degrees, the symmetrical included angle of each pair of wedge-shaped clamping blocks is 12-16 degrees, and the included angle is a mechanical self-locking anti-loosening angle.
Optionally, the clamping working surface of the wedge-shaped clamping block is processed with fine teeth.
Optionally, the number of the water-cooling channels is two, the two water-cooling channels are respectively located on two side walls of the symmetrical inclined wedge-shaped structure of the chuck, and the front side and the back side of the chuck are respectively provided with four cooling water nozzles corresponding to the four cooling water nozzles.
Optionally, the number of the water-cooling channel is one, the water-cooling channel extends from one side wall of the chuck to the other side wall, and two cooling water nozzles corresponding to the water-cooling channel are arranged on the surface of the chuck.
Optionally, the chuck is provided with a screw hole, and the two positioning blocking pieces are mounted on two sides of the chuck through fixing screws.
Optionally, the chuck is made of a high-temperature alloy material, the high-temperature metal gasket is made of a high-temperature resistant metal material, and the wedge-shaped clamping block is made of a high-temperature alloy material.
The invention further discloses a ceramic matrix composite high-temperature tensile test tool, which is characterized by comprising:
the upper clamp tool and the lower clamp tool are the clamp tools and can be respectively clamped at clamping ends at two ends of the sample piece to load tension on the sample piece.
The invention further discloses a method for performing a high-temperature test by using the ceramic matrix composite high-temperature tensile test tool, which specifically comprises the following steps:
contact portion mounting step S110:
symmetrically sticking high-temperature metal gaskets to two sides of a clamping section of a sample piece of the ceramic matrix composite by using an upper clamp tool and a lower clamp tool, symmetrically placing wedge-shaped clamping blocks outside the high-temperature metal gaskets on the two sides, and positioning and aligning the high-temperature metal gaskets and the wedge-shaped clamping blocks by using positioning pins and the sample piece of the ceramic matrix composite so as to form a contact part;
non-contact portion mounting step S120:
the contact part and a sample piece are clamped and then placed in an inclined plane space of the chuck, the inclined plane of the wedge-shaped clamping block is in sliding fit with the inclined plane inside the chuck, when tensile load is applied, the sample piece is clamped through an inclined plane structure, and the positioning blocking pieces are fixed on two sides of the chuck through fixing screws, so that the wedge-shaped clamping block is prevented from sliding out in the experimental process;
high temperature tensile test step S130:
the upper clamp tool and the lower clamp tool are connected to a loading mechanism of the testing machine through a pull rod to perform tensile testing on the sample piece, in the test process, the middle test section of the sample piece is placed in a high-temperature environment box and is in the designed high-temperature air environment, the upper clamp tool and the lower clamp tool are located outside a heating area of the high-temperature environment box, and the upper clamp tool and the lower clamp tool are cooled through a designed water-cooling structure.
The invention has the following advantages:
1. the test part of the sample is positioned in a high-temperature air environment, and compared with the integral high-temperature test method, the test method has the advantages of simple and convenient test operation and high test efficiency on the premise of not reducing the test precision;
2. the upper and lower chuck parts are designed by adopting a water cooling structure, so that the temperature of the upper and lower chucks is lower than 500 ℃, meanwhile, the temperature of the wedge-shaped clamping block is lower than 700 ℃ through heat conduction, the strength can not be reduced and deformed under the test environment of 800-1500 ℃, the problems of rapid strength reduction and large thermal deformation of high-temperature alloy above 800 ℃ are solved, and the structure is simplified and reliable;
3. the wedge-shaped clamping blocks with the symmetrical inclined planes realize self-adaptive centering and anti-loosening of inclined plane clamping, and the wedge-shaped clamping blocks are made of high-temperature materials, so that the wedge-shaped clamping blocks are not deformed at high temperature and the strength meets the requirements;
4. the design of the semi-rigid high-temperature alloy gasket realizes the skid resistance between the wedge-shaped clamping block and the sample piece, and simultaneously avoids local damage to the brittle sample piece;
5. the positioning and centering of the sample piece are realized by using the positioning pin, so that the unbalance loading is avoided; meanwhile, the rotating structure can realize automatic centering in the other direction, so that the sample piece is prevented from bearing abnormal load;
6. the separation design and the separation blade connection design of the chuck and the contact device serving as the clamping block can ensure certain precision of the current test under the extreme condition of water cut-off, and meanwhile, only the clamping block needs to be replaced in the aspect of maintenance, so that the cost is saved.
Drawings
FIG. 1 is a view of a sample piece for use in an embodiment of the present invention;
FIG. 2 is a front view of a test fixture according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the working state of a test fixture according to an embodiment of the invention;
FIG. 4 is a schematic view of a clamping state of a clamp assembly according to an embodiment of the present invention;
FIG. 5 is a schematic view of a clamp tool in a disengaged state in accordance with an embodiment of the present invention;
FIG. 6 is an exploded view of a fixture assembly according to an embodiment of the present invention;
FIG. 7 is an exploded view of a fixture tooling component according to an embodiment of the present invention;
FIG. 8 is a side view of a wedge-shaped clamp block according to an embodiment of the present invention;
FIG. 9 is a perspective view of a wedge-shaped clamp block according to an embodiment of the present invention;
FIG. 10 is a schematic view of a dowel according to a specific embodiment of the present invention;
FIG. 11 is an exploded view of a water cooled non-contact section according to an embodiment of the present invention;
FIG. 12 is an elevation view of a chuck in accordance with an embodiment of the present invention;
FIG. 13 is an exploded schematic view of a contact portion according to an embodiment of the present invention;
FIG. 14 is a cross-sectional view of a contact portion according to a specific embodiment of the present invention;
FIG. 15 is a schematic diagram of a test job installation process according to an embodiment of the present invention.
The reference numerals in the drawings respectively refer to the technical features:
1. water-cooling the non-contact portion; 2. a contact portion; 3. a sample piece; 4. a high temperature environment chamber; 11. a pull rod; 12. a chuck; 13. positioning a baffle plate; 14. a set screw; 15. a cooling water connection nozzle; 16. a water-cooling channel; 17. screw holes; 21. a wedge-shaped clamping block; 22. a high temperature metal gasket; 23. and positioning the pin.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The invention mainly comprises the following steps: the design that the chuck does not directly contact the test piece is adopted, the device is divided into a water-cooling non-contact part and a contact part, and the water-cooling contact part of the chuck is difficult to damage due to high temperature under the water-cooling effect; the clamping heads can be arranged outside the high-temperature furnace in a clamping mode of the clamping heads on the two sides, so that the possibility of damaging the tool at high temperature is further reduced; the clamping block is adopted to clamp the test piece, so that even if the test piece is damaged at high temperature due to water cut-off accidents, the test can still be continuously carried out due to insensitivity of the clamping block to high-temperature deformation and connection and fixation of the separation blade, and the test result cannot be greatly influenced; when the damage happens, only the clamping block and the gasket are replaced generally, so that the device is more economical.
According to the tensile fatigue test method for the ceramic matrix composite material in the high-temperature environment, a domestic related test method and a standard vacancy are used for reference, and a test method for the high-temperature tensile property of the ceramic matrix composite material in the United states (the standard number is ASTM C1275-15) is used, and referring to fig. 1, the test required to be carried out by the invention is exemplary, and the test can be in the shape of a flat dumbbell, and the thickness of the flat dumbbell is 2-4 mm; the two ends are clamping loading sections which are wider, have the width dimension of 20-24 mm and are provided with central positioning holes with the diameter of 6-8 mm; the middle section is a test section, is narrow, and has a width dimension of 8-10 mm; the test section and the holding section adopt large circular arc transition, so that stress concentration damage in the test is avoided; the specific design size of each part is destroyed, and the sample piece is guaranteed to be destroyed in the test section in the test by simulation calculation analysis.
Referring to fig. 2, the invention designs a fixture tool for a ceramic matrix composite high-temperature tensile test, which can be used as an upper fixture tool or a lower fixture tool, and is respectively clamped at two ends of a sample piece 3 and placed in a high-temperature environment box 4 for a high-temperature tensile strength test.
From fig. 3 to fig. 15, the structure and the installation process of the fixture tool for high temperature tensile test according to the present invention will be described.
Referring to fig. 4-6, the fixture tool comprises a water-cooling non-contact part 1 and a contact part 2, wherein the water-cooling non-contact part 1 clamps and fixes a sample piece 3 through the contact part 2.
Specifically, referring to fig. 7, various components included in the fixture assembly are shown.
The contact portion 2 includes: the device comprises two wedge-shaped clamping blocks 21, two high-temperature metal gaskets 22 and a positioning pin 23;
the wedge-shaped clamping blocks 21 are symmetrically arranged on two sides of a clamping section of the sample piece 3, a clamping working surface is opposite to the sample piece 3, and an inclined plane has a certain angle, so that the sample piece 3 is symmetrically clamped, mechanical self-locking is formed, positioning pin through holes are designed at positions corresponding to sample piece positioning holes, and the centering and test process of the installation of the sample piece 3 is facilitated, and the sliding displacement is prevented.
Referring to fig. 8 and 9, in an alternative embodiment, an included angle of the inclined surfaces of the wedge-shaped clamping blocks 21 is 6 to 8 degrees, and a symmetrical included angle of a pair of wedge-shaped clamping blocks is 12 to 16 degrees, which is a mechanical self-locking anti-loose angle.
And the clamping working surface of the wedge-shaped clamping block 21 is provided with fine teeth so as to increase the clamping stability.
The wedge-shaped clamping blocks 21 are made of high-hardness high-temperature metal materials, such as tungsten copper.
The wedge-shaped clamping blocks 21 with the symmetrical inclined planes realize self-adaptive centering and looseness prevention of inclined plane clamping; the high-temperature material is adopted for preparation, so that the high-temperature material is not deformed at high temperature, and the strength meets the requirement.
High temperature metal gasket 22 symmetry is obeyed in 3 clamping section two sides of sample, and the center corresponds the dowel pin position and is equipped with the pin through-hole, and high temperature metal gasket has increased the centre gripping stability of sample 3 with wedge clamp splice 21, avoids taking place the sample test in-process and slides, simultaneously, avoids the tooth of wedge clamp splice clamping face to cause local damage to brittle material's sample.
In one embodiment, the high temperature metal gasket 21 is made of a soft high temperature resistant metal, such as copper alloy, with a thickness of 0.2-0.5 mm, and is designed and manufactured according to the thickness of the sample.
Referring to fig. 10, the positioning pin 23 is made of high temperature and high strength metal, such as GH4169, and is cylindrical, the diameter of the positioning pin is matched with the positioning hole of the sample piece 3, and the positioning pin penetrates through the positioning pin through hole of the wedge-shaped clamping block 21 on both sides, and the length of the positioning pin is designed to be not more than the range of the wedge-shaped clamping block 21 on both sides, so that the sample piece is positioned and centered.
The positioning pin can realize positioning and centering of the sample piece, and unbalance loading is avoided; meanwhile, the rotating structure can realize automatic centering in the other direction, and the sample piece is prevented from bearing abnormal load.
Referring to fig. 11, the water-cooled non-contact section 1 includes a tension rod 11, a collet 12, two positioning fences 13 and a water-cooled channel 16,
the pull rod 11 is fixed on the upper part of the chuck 12 and is used for connecting with the loading framework, for example, by screwing, welding or integrally preparing, and the skilled person will know that other methods can be used for fixing the pull rod 11 and the chuck 12;
the middle part of the chuck 12 is provided with a symmetrical inclined plane wedge structure, the wedge structure is wide at the top and narrow at the bottom and is matched with the inclined plane of the wedge-shaped clamping block 21, so that the sample piece 3 is clamped and loaded after the inclined plane with a self-locking anti-loosening angle is matched with the wedge-shaped clamping block 21 in the stretching process;
the two positioning blocking pieces 13 can be fixed on the front side and the back side of the chuck 12, so that after the water-cooling non-contact part 1 clamps and fixes the sample piece 3 through the contact part 2, the contact part 2 and the sample piece 3 are fixedly blocked from the front side and the back side, and the contact part 2 and the sample piece 3 are prevented from falling off.
Referring to fig. 12, water cooling channels 16 are provided on both side walls of the symmetrical inclined wedge structure of the cartridge 12, and are provided with cooling water nipples 15, thereby forming a water cooling channel for circulating cooling.
The collet is made of a high temperature alloy, and illustratively, GH4169 may be used.
Referring to fig. 7, in the present example, the number of the water cooling passages 16 is two, and the two water cooling passages are respectively located on two side walls of the symmetrical inclined wedge structure of the chuck 12, and respectively have four cooling water nozzles 15 corresponding to the two side walls on the front and back sides of the chuck.
However, the present invention is not limited thereto, and the water cooling channel 16 may also be a single channel extending from one side wall of the chuck 12 to the other side wall, and two cooling water nozzles 15 corresponding to the channel are provided on the surface of the chuck.
Further, the chuck 12 is provided with screw holes 17, two positioning blocking pieces 13 are mounted on two sides of the chuck 12 through fixing screws 14, the positioning blocking pieces 13 are high-temperature alloy metal flat plates, such as GH4169, and bolt mounting through holes are designed on the positioning blocking pieces 13 and are consistent with the positions of the chuck threaded holes.
In the invention, the fixing screw 14 of the positioning baffle plate 13 adopts a standard specification screw, and the cooling water nozzle 15 is of a standard specification and is arranged in the water cooling channel of the chuck for connecting cooling water.
The invention further discloses a ceramic matrix composite high-temperature tensile test tool, which comprises an upper clamp tool, a lower clamp tool and a sample piece 3, wherein the upper clamp tool and the lower clamp tool are the clamp tools and can be respectively clamped at the clamping ends at two ends of the sample piece 3 to load tensile force on the sample piece 3.
The chuck adopts a water-cooling structural design, the strength of the chuck can not be reduced and deformed under a test environment of 800-1500 ℃, the problems of rapid reduction of the strength of the high-temperature alloy above 800 ℃ and large thermal deformation are solved, and the structure is simplified and reliable; the separation design and the separation blade connection design of the chuck and the contact part serving as the clamping block can ensure certain precision of the current test under the extreme condition of water break, and only the clamping block needs to be replaced in the aspect of maintenance, so that the cost is saved.
Referring to fig. 13-15, a method for performing a high temperature test by using the ceramic matrix composite high temperature tensile test fixture of the invention is further disclosed, which specifically comprises the following steps:
contact portion mounting step S110:
referring to fig. 13 and 14, high temperature metal gaskets 22 are symmetrically adhered to two sides of the clamping section of the sample piece 3 made of the ceramic matrix composite material, wedge-shaped clamping blocks 21 are symmetrically arranged outside the high temperature metal gaskets 22 on the two sides, and the high temperature metal gaskets 22 and the wedge-shaped clamping blocks 21 are positioned and aligned with the sample piece 3 made of the ceramic matrix composite material by using positioning pins 23, so that a contact part is formed.
Non-contact portion mounting step S120:
referring to fig. 15, the contact part 2 and the sample piece 3 are clamped and then placed in the inclined plane space of the chuck 12, the inclined plane of the wedge-shaped clamping block 21 is in sliding fit with the inclined plane inside the chuck, when tensile load is applied, the sample piece 3 is clamped tightly through the inclined plane structure, the positioning blocking pieces 13 are fixed on two sides of the chuck 12 through the fixing screws 14, the wedge-shaped clamping block 21 is prevented from sliding out in the experiment process, and the safety protection effect is achieved. The final shape, as illustrated in fig. 4.
When the mounting of one end of the sample piece 3 is completed, the other end is mounted in the same manner as in step S110 and step S120.
High temperature tensile test step S130:
referring to fig. 2 and 3, the upper clamp tool and the lower clamp tool are connected to a loading mechanism of the testing machine through a pull rod 11 to perform tensile testing on the sample piece 3, in the testing process, the middle testing section of the sample piece 3 is placed in a high-temperature environment box 4 and is in a designed high-temperature (800-1500 ℃) air environment, the upper clamp tool and the lower clamp tool are located outside a heating area of the high-temperature environment box and are only affected by heat radiation temperature, and the temperature of the upper clamp tool and the lower clamp tool is not higher than 500 ℃ through the design of a water-cooling structure.
In summary, the invention has the following advantages:
1. the test part of the sample is positioned in a high-temperature air environment, and compared with the integral high-temperature test method, the test method has the advantages of simple and convenient test operation and high test efficiency on the premise of not reducing the test precision;
2. the upper and lower chuck parts are designed by adopting a water cooling structure, so that the temperature of the upper and lower chucks is lower than 500 ℃, meanwhile, the temperature of the wedge-shaped clamping block is lower than 700 ℃ through heat conduction, the strength can not be reduced and deformed under the test environment of 800-1500 ℃, the problems of rapid strength reduction and large thermal deformation of high-temperature alloy above 800 ℃ are solved, and the structure is simplified and reliable;
3. the wedge-shaped clamping blocks with the symmetrical inclined planes realize self-adaptive centering and anti-loosening of inclined plane clamping, and the wedge-shaped clamping blocks are made of high-temperature materials, so that the wedge-shaped clamping blocks are not deformed at high temperature and have strength meeting the requirements;
4. the design of the semi-rigid high-temperature alloy gasket realizes the skid resistance between the wedge-shaped clamping block and the sample piece, and simultaneously avoids local damage to the brittle sample piece;
5. the positioning and centering of the sample piece are realized by using the positioning pin, so that the unbalance loading is avoided; meanwhile, the rotating structure can realize automatic centering in the other direction, so that the sample piece is prevented from bearing abnormal load;
6. the separation design and the separation blade connection design of the chuck and the contact device serving as the clamping block can ensure certain precision of the current test under the extreme condition of water cut-off, and meanwhile, only the clamping block needs to be replaced in the aspect of maintenance, so that the cost is saved.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a tensile anchor clamps frock of ceramic matrix composite high temperature which characterized in that includes:
the water-cooling non-contact part and the contact part, wherein the water-cooling non-contact part clamps and fixes the sample piece through the contact part;
the contact portion includes: two wedge-shaped clamping blocks and a positioning pin;
the wedge-shaped clamping blocks are symmetrically arranged on two sides of the sample piece clamping section, the clamping working surface is opposite to the sample piece, the inclined plane has a certain angle, so that the sample piece is symmetrically clamped and forms mechanical self-locking, and a positioning pin through hole is designed at a position corresponding to a sample piece positioning hole;
the positioning pin is matched with the positioning hole of the sample piece and penetrates through the positioning pin through holes of the wedge-shaped clamping blocks on the two sides;
the water-cooling non-contact part comprises a pull rod, a chuck, two positioning baffle plates and a water-cooling channel,
the pull rod is fixed at the upper part of the chuck and is used for being connected with the loading framework;
the middle part of the chuck is provided with a symmetrical inclined plane wedge-shaped structure, the wedge-shaped structure is wide at the top and narrow at the bottom and is matched with the inclined plane of the wedge-shaped clamping block, so that a sample piece is clamped and loaded after the inclined plane with a self-locking anti-loosening angle is matched with the wedge-shaped clamping block in the stretching process;
the two positioning blocking pieces are fixed on the front side and the back side of the chuck, so that after the water-cooling non-contact part clamps and fixes the sample piece through the contact part, the contact part and the sample piece are fixedly blocked from the front side and the back side;
and two side walls of the symmetrical inclined plane wedge-shaped structure of the chuck are provided with water cooling channels, and the water cooling channels are provided with cooling water connection nozzles.
2. The clamp tooling of claim 1,
the contact part further comprises two high-temperature metal gaskets which are symmetrically attached to two sides of the clamping section of the sample piece and clamped between the clamping working surface of the wedge-shaped clamping block and the sample piece, and a pin through hole is formed in the center of the contact part corresponding to the position of the positioning pin.
3. The clamp tooling of claim 2 wherein,
the included angle of the inclined planes of the wedge-shaped clamping blocks is 6-8 degrees, the symmetrical included angle of the pair of wedge-shaped clamping blocks is 12-16 degrees, and the wedge-shaped clamping blocks are mechanical self-locking anti-loosening angles.
4. The clamp tooling of claim 2 wherein,
and small teeth are processed on the clamping working surface of the wedge-shaped clamping block.
5. The clamp tooling of claim 2 wherein,
the two water cooling channels are respectively positioned on two side walls of the symmetrical inclined plane wedge-shaped structure of the chuck, and the front side and the back side of the chuck are respectively provided with four cooling water connection nozzles corresponding to the two side walls.
6. The clamp tooling of claim 2 wherein,
the water cooling channel is one, extends to another lateral wall from a lateral wall of chuck, has two cooling water connector that correspond with it on the surface of chuck.
7. The clamp tooling of claim 2 wherein,
the chuck is provided with screw holes, and the two positioning blocking pieces are arranged on two sides of the chuck through fixing screws.
8. The clamp tooling of claim 2 wherein,
the chuck is made of high-temperature alloy, the high-temperature metal gasket is made of high-temperature-resistant metal, and the wedge-shaped clamping block is made of high-temperature alloy.
9. The utility model provides a ceramic matrix composite high temperature tensile test frock which characterized in that includes:
the upper clamp tool and the lower clamp tool are the clamp tool in any one of claims 2 to 8, can be respectively clamped at clamping ends at two ends of a sample piece, and can load tension on the sample piece.
10. The method for performing the high-temperature test by using the ceramic matrix composite high-temperature tensile test tool according to claim 9, specifically comprising the following steps:
contact portion mounting step S110:
high-temperature metal gaskets are symmetrically pasted on two surfaces of a clamping section of a sample piece of the ceramic matrix composite material by an upper clamp tool and a lower clamp tool, wedge-shaped clamping blocks are symmetrically arranged outside the high-temperature metal gaskets on the two surfaces, and the high-temperature metal gaskets and the wedge-shaped clamping blocks are positioned and aligned by positioning pins and the sample piece of the ceramic matrix composite material, so that a contact part is formed;
non-contact portion mounting step S120:
the contact part and a sample piece are clamped and then placed in an inclined plane space of the chuck, the inclined plane of the wedge-shaped clamping block is in sliding fit with the inclined plane inside the chuck, when tensile load is applied, the sample piece is clamped through an inclined plane structure, and the positioning blocking pieces are fixed on two sides of the chuck through fixing screws, so that the wedge-shaped clamping block is prevented from sliding out in the experimental process;
high temperature tensile test step S130:
the upper clamp tool and the lower clamp tool are connected to a loading mechanism of the testing machine through a pull rod to perform tensile testing on the sample piece, in the test process, the middle test section of the sample piece is placed in a high-temperature environment box and is in the designed high-temperature air environment, the upper clamp tool and the lower clamp tool are located outside a heating area of the high-temperature environment box, and the upper clamp tool and the lower clamp tool are cooled through a designed water-cooling structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210814822.8A CN115014946A (en) | 2022-07-12 | 2022-07-12 | Ceramic matrix composite high-temperature tensile fixture tool and test method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210814822.8A CN115014946A (en) | 2022-07-12 | 2022-07-12 | Ceramic matrix composite high-temperature tensile fixture tool and test method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115014946A true CN115014946A (en) | 2022-09-06 |
Family
ID=83080372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210814822.8A Pending CN115014946A (en) | 2022-07-12 | 2022-07-12 | Ceramic matrix composite high-temperature tensile fixture tool and test method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115014946A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380637A (en) * | 2023-04-14 | 2023-07-04 | 湖北泽融检测技术有限公司 | Adjustable tensile detection clamp for ceramic matrix composite |
| CN116840047A (en) * | 2023-06-30 | 2023-10-03 | 天津大学 | Cu-based shape memory alloy tensile property test improved sample and application thereof |
| CN117433936A (en) * | 2023-12-19 | 2024-01-23 | 中航试金石检测科技(成都)有限公司 | Small sample low cycle fatigue testing device |
-
2022
- 2022-07-12 CN CN202210814822.8A patent/CN115014946A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380637A (en) * | 2023-04-14 | 2023-07-04 | 湖北泽融检测技术有限公司 | Adjustable tensile detection clamp for ceramic matrix composite |
| CN116840047A (en) * | 2023-06-30 | 2023-10-03 | 天津大学 | Cu-based shape memory alloy tensile property test improved sample and application thereof |
| CN117433936A (en) * | 2023-12-19 | 2024-01-23 | 中航试金石检测科技(成都)有限公司 | Small sample low cycle fatigue testing device |
| CN117433936B (en) * | 2023-12-19 | 2024-04-05 | 中航试金石检测科技(成都)有限公司 | Small sample low cycle fatigue testing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115014946A (en) | Ceramic matrix composite high-temperature tensile fixture tool and test method thereof | |
| CN115014944A (en) | Ceramic matrix composite high-temperature tensile fatigue performance clamp tool and test method thereof | |
| CN108225899B (en) | Composite material sheet high-temperature tensile test fixture with self-centering function and method | |
| CN109100219B (en) | Fretting fatigue test device and method | |
| CN110044692A (en) | A kind of high temperature tension test fixture for fragile material flat test piece | |
| CN111398053B (en) | High-temperature test device with wedge-shaped sample self-centering and multi-degree-of-freedom adjustable | |
| CN111693371A (en) | Test fixture for testing tensile property of ceramic matrix composite | |
| CN107702983B (en) | Clamp, clamp pair and stretching device | |
| CN211317988U (en) | Clamp for small sample shearing test | |
| CN115014945A (en) | Ceramic matrix composite material high temperature vacuum environment tensile fatigue performance anchor clamps frock | |
| CN212735131U (en) | Clamping device | |
| CN115753337A (en) | Ceramic matrix composite high temperature multipurpose test fixture | |
| CN219694737U (en) | High-temperature test fixture for boards with thickness below 3mm | |
| CN219369374U (en) | Universal extremely-high-temperature stretching ceramic clamp assembly for bars and plates | |
| CN218411966U (en) | Clamp tool for stretching L-shaped eccentric test piece on universal testing machine | |
| CN111112957A (en) | Machining method for reducing deformation of hollow aluminum alloy part | |
| CN217638462U (en) | Overlap joint shear test frock | |
| CN112461755B (en) | Tensile shear strength test device | |
| CN213364441U (en) | Dyeing tension test equipment | |
| CN219455708U (en) | Stretching clamp for plate-shaped small dumbbell sample | |
| CN218297796U (en) | Special tool for rectangular sample tensile test detection | |
| CN218330925U (en) | Clamp for shearing test of V-shaped notch part of composite material | |
| CN106514515A (en) | Self-locking type test fixture | |
| CN216208087U (en) | Device for clamping circular section parts | |
| CN115389312B (en) | Plate-shaped sample ultra-high temperature low cycle fatigue test clamp, clamping device and test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |