CN112710559B - High-temperature mechanical test device and extensometer auxiliary assembly thereof - Google Patents
High-temperature mechanical test device and extensometer auxiliary assembly thereof Download PDFInfo
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- CN112710559B CN112710559B CN201911023767.5A CN201911023767A CN112710559B CN 112710559 B CN112710559 B CN 112710559B CN 201911023767 A CN201911023767 A CN 201911023767A CN 112710559 B CN112710559 B CN 112710559B
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- extensometer
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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
- G01N3/08—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
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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
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
Abstract
The invention provides an extensometer auxiliary assembly which is used for being matched with a contact type high-temperature extensometer to perform a high-temperature mechanical test and comprises a buckle assembly, wherein the buckle assembly comprises a U-shaped sleeve and a rotating clamping block; the U-shaped sleeve is provided with a bottom and two side parts which form a U-shaped shape, and the bottom is provided with an inner knife edge; the rotating fixture block is provided with a rotating part, a crimping part, a counterweight part and a connecting part, the rotating fixture block and the U-shaped sleeve limit a test piece channel for a test section of a test piece to pass through, the inner side knife edge and the end side knife edge are positioned on two opposite sides of the test piece channel, and the counterweight part keeps the end side knife edge to rotate to reduce the trend of the test piece channel, so that the inner side knife edge and the end side knife edge respectively press two opposite surfaces of the test section of the test piece from the two sides of the test piece. The invention also provides a high-temperature mechanical test device comprising the extensometer auxiliary assembly. Above-mentioned extensometer auxiliary assembly can reduce the extensometer risk of skidding, improves experimental success rate, can also reduce the installation operation degree of difficulty of contact high temperature extensometer.
Description
Technical Field
The invention relates to a high-temperature mechanical test device which comprises a contact type high-temperature extensometer. In particular, the invention also relates to an extensometer auxiliary assembly which can be matched with a contact type high-temperature extensometer to carry out a high-temperature mechanical test.
Background
With the continuous development and update of the technology, a plurality of novel high-temperature structural materials are appeared at present, and the design service temperature of the high-temperature structural materials is often very high. Taking a ceramic matrix composite as an example, the material has wide application prospect in the field of aerospace, and the test temperature of the high-temperature mechanical property of the material is usually over 1200 ℃. Therefore, data measurement of the loaded deformation of the novel high-temperature structural material under such high-temperature environment by using a contact high-temperature extensometer is often required. Contact high temperature extensometers often have ceramic extension rods. In the high-temperature mechanical property test of the material, the contact high-temperature extensometer completes the measurement and transmission of the material load deformation in a test gauge length section or a test uniform section by contacting the front end of the ceramic extension rod with the surface of the tested material.
In an actual high-temperature mechanical test, the inventor finds that the front end of an extension rod of an extensometer easily slips relative to the surface of a tested piece in the test process, so that inaccurate, wrong or failed test can be caused, the test success rate and the efficiency are reduced, and the test cost is increased. In addition, the existing high-temperature extensometer is difficult to install and operate. The inventors analyzed that this is caused by the small contact area and friction between the front end of the high-temperature ceramic rod and the surface of the test piece.
Therefore, the inventor of the invention intends to provide an extensometer auxiliary assembly, which can reduce the risk of relative slip between an extension rod and a test piece, improve the success rate of the test and reduce the test cost. The extensometer auxiliary assembly can also reduce the installation operation difficulty of the contact type high-temperature extensometer.
Disclosure of Invention
The invention aims to provide an extensometer auxiliary assembly which can reduce the risk of relative slippage between an extension rod and a test piece of a contact type high-temperature extensometer, improve the success rate of tests and reduce the cost.
Another object of the present invention is to provide an extensometer auxiliary assembly, which can reduce the difficulty of installation operation of a contact type high temperature extensometer.
The invention provides an extensometer auxiliary assembly which is used for being matched with a contact type high-temperature extensometer to perform a high-temperature mechanical test and comprises a buckle assembly, wherein the buckle assembly comprises a U-shaped sleeve and a rotating clamping block; the U-shaped sleeve is provided with a bottom and two side parts which form a U-shaped shape, and the bottom is provided with an inner knife edge; in the rotating fixture block, the rotating part is arranged between the two side parts and is respectively and rotatably matched with the two side parts, so that the rotating axis of the rotating fixture block is limited; the crimping portion is opposite to the bottom portion and has an end-side knife edge, and the counterweight portion is arranged so that the center of gravity of the rotating cartridge is offset from the rotation axis and is located on the counterweight side of the rotation axis; the connecting part is arranged to be connected with an extension rod of the contact type high-temperature extensometer, wherein the rotating clamping block and the U-shaped sleeve limit a test piece channel for a test section of a test piece to pass through, the inner side knife edge and the end side knife edge are positioned at two opposite sides of the test piece channel, and the counterweight part keeps the end side knife edge to rotate so as to reduce the trend of the test piece channel, so that the inner side knife edge and the end side knife edge respectively press two opposite surfaces of the test section of the test piece from two sides of the test piece.
In one embodiment, each of the two side portions of the U-shaped sleeve includes an arc groove having an opening, and the rotating portion of the rotating block includes a rotating shaft on both sides, and the rotating portion is rotatably disposed between the two side portions by the rotating shaft being inserted into the arc groove from the opening.
In one embodiment, each of the side portions is formed by a horizontal arm and an arc-shaped arm, one end of the horizontal arm is connected with the bottom of the U-shaped sleeve, the other end of the horizontal arm is connected with the arc-shaped arm, and the arc-shaped arm is bent to form the arc-shaped groove.
In one embodiment, the inner edge and the end edge press the test section of the test piece from both sides at the same height.
In one embodiment, the rotary latch includes a center portion, a left leg portion extending from the center portion toward a left lower side, a right leg portion extending from the center portion toward a right side, and a lower leg portion extending from the center portion toward a lower side, the center portion, the left leg portion, the right leg portion, and the lower leg portion respectively constituting the rotating portion, the press-contact portion, the weight portion, and the connection portion of the rotary latch.
In one embodiment, the connecting part is provided with a limit groove for being inserted into contact with an extension rod of the contact type high-temperature extensometer to be matched with the extension rod for fixing and limiting.
In one embodiment, the extensometer auxiliary component is made of a ceramic material.
In one embodiment, two of the snap assemblies are included.
The invention provides a high-temperature mechanical test device which comprises a contact type high-temperature extensometer and an extensometer auxiliary assembly, wherein the contact type high-temperature extensometer is provided with two extension rods, and the extensometer auxiliary assembly is characterized in that a buckle assembly of the extensometer auxiliary assembly is connected with the extension rods through a connecting part of a rotating clamping block.
Through adopting above-mentioned extensometer auxiliary assembly, can realize the extension rod of high temperature extensometer and test piece material surface between relative spacing fixed under high temperature environment, can show the risk of skidding that reduces high temperature extensometer and test piece surface between to avoid deformation measurement's failure, show and improve high temperature mechanics experiment success rate, and then reduce testing cost. The extensometer auxiliary assembly can also reduce the difficulty of installation and operation of the high-temperature extensometer.
Moreover, by adopting the extensometer auxiliary assembly, the contact compaction between the knife edge and the surface of the test piece can be further realized through the pressure provided by the extension rod of the high-temperature extensometer. By increasing the contact area, the contact area and the contact pressing force with adjustable value, the relative sliding between the buckle assembly and the surface of the test piece can be prevented.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
fig. 1 is a perspective view of a high-temperature mechanical testing apparatus.
Fig. 2 is a front view of the high temperature mechanical testing apparatus.
Fig. 3 is a right side view of the high temperature mechanical testing apparatus.
Fig. 4 is a sectional view taken along line a-a in fig. 3.
Fig. 5 is a partially enlarged view of fig. 4.
Fig. 6 is a perspective view of the U-shaped cover.
Figure 7 is a front view of the U-shaped sleeve.
Fig. 8 is a perspective view of the rotation latch.
Fig. 9 is another perspective view of the rotating latch.
Fig. 10 is a front view of the rotating latch.
Detailed Description
The present invention will be further described with reference to the following detailed description and the accompanying drawings, wherein the following description sets forth further details for the purpose of providing a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms other than those described herein, and it will be readily apparent to those skilled in the art that the present invention may be embodied in many different forms without departing from the spirit or scope of the invention.
For example, a first feature described later in the specification may be formed over or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.
Fig. 1, 2 and 3 show the fitting state of the extensometer auxiliary assembly 10, the test piece 20 and the extension bar 301 of the contact high-temperature extensometer 30 from different angles, respectively, fig. 4 is a sectional view taken along line a-a in fig. 3, and fig. 5 is a partially enlarged view of a portion where circle B in fig. 4 is located. The extensometer sub-assembly 10 and the contact high temperature extensometer 30 may be considered part of the high temperature mechanical test device 100, or alternatively, the high temperature mechanical test device 100 may include the extensometer sub-assembly 10 and the contact high temperature extensometer 30. It should be noted that fig. 1-5 and other figures that follow are merely exemplary and not drawn to scale, and should not be construed as limiting the scope of the invention as actually claimed.
The contact high temperature extensometer 30 includes two extension rods 301, the two extension rods 301 extending in parallel protruding from an extensometer body 302 (schematically shown in fig. 1). For example, the contact-type high-temperature extensometer currently used has a ceramic extension rod mounted on each of the two measuring arms, i.e., the extension rod 301 is made of a ceramic material. The tip of the front end of the extension rod 301 (i.e. the left end in fig. 1 or fig. 2) contacts with the surface of the material of the tested piece 20 and is positioned by friction force, thereby completing the measurement and transmission of the deformation amount of the material under load in the testing section 201 of the tested piece 20. During the test, the front end portion of the extension rod 301 is in a high temperature environment.
For convenience in description, spatial relational terms, such as "left," "right," "left-down," "front," "back," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures, such as fig. 1, 2, etc., also to illustrate directional schematics of up, down, left, right, etc. It will be understood that these terms are intended to encompass other orientations of the component or element in use or operation in addition to the orientation depicted in the figures. For example, if the components in the figures are turned over, elements described as being on the "left" side of other elements or features would then be oriented on the "right" side of the other elements or features. Thus, the exemplary word "left" can encompass a variety of orientations of different placement states. Other orientations of the components are possible (rotated 90 degrees or at other orientations) and the spatial relationship descriptors used herein should be interpreted accordingly. Further, the conversion methods in the different embodiments may be appropriately combined.
The extensometer auxiliary assembly 10 may be mated with a contact high temperature extensometer 30 for high temperature mechanical testing. Extensometer assist assembly 10 includes a snap assembly 1. As shown in fig. 1 to 3, the extensometer auxiliary assembly 10 comprises two snap assemblies 1, respectively located on the upper side and the lower side. The buckle assembly 1 comprises a U-shaped sleeve 2 and a rotating clamping block 3.
Fig. 6 and 7 show example configurations of the U-shaped jacket 2 from different angles, respectively. The U-shaped envelope 2 has a bottom 21 and two sides 22 forming a U-shape. The bottom 21 has an inner edge 211. In the embodiment of fig. 3 and 4, the two sides 22 of the U-shaped jacket 2 each comprise a circular arc groove 221 with an opening 221 a. The circular arc groove 221 is substantially semicircular. Further, each side portion 22 is composed of a horizontal arm 222 and an arc-shaped arm 223, one end (left end in fig. 4) of the horizontal arm 222 is connected to the bottom portion 21 of the U-shaped housing 2, the other end (right end in fig. 4) of the horizontal arm 222 is connected to the arc-shaped arm 223, and the arc-shaped arm 223 is bent to form the arc-shaped groove 221.
Fig. 8, 9 and 10 show example configurations of the rotating latch 3 from different angles, respectively. The rotating cartridge 3 has a rotating portion 31, a crimping portion 32, a weight portion 33, and a connecting portion 34. Referring to fig. 5, the crimping portion 32 is opposed to the bottom 21 of the U-shaped sleeve 2, and has an end-side knife edge 321.
The rotating portion 31 is disposed between the two side portions 22 of the U-shaped housing 2 and rotatably engaged with the two side portions 22, respectively, thereby defining a rotation axis X0 of the rotary latch 3. In other words, the rotating latch 3 can rotate relative to the U-shaped housing 2 about the rotation axis X0. In the illustrated embodiment, the rotating portion 31 of the rotating latch 3 includes the rotating shaft 311 at both sides (front and rear sides in fig. 3). The rotating portion 31 is rotatably disposed between the two side portions 22 by the cylindrical rotating shaft 311 being caught from the opening 221a into the circular arc groove 221. The arc arm 223 bent in a substantially arc shape, for example, ensures that the opening 221a formed by the arc arm 223 has a sufficient fit clearance with the rotation shaft 311, so that the rotation shaft 311 can be allowed to slide into the arc groove 221 from the opening 221 a. The axial center line of the rotating shaft 311 is also the rotating axis X0 of the rotating latch 3. The state shown in fig. 5 is a horizontally placed state of the extensometer auxiliary assembly 10 or the buckle assembly 1, and shows the force therein. The horizontally disposed state of the extensometer auxiliary assembly 10 generally means a state in which the horizontal arm 222 of the U-shaped sleeve 2 or the bottom arm constituting the bottom 21 is horizontally extended. Referring to fig. 5, in the horizontal placement state, the height of the rotation axis X0 (or the center of the arc groove 221) is higher than the height of the inner knife edge 211 of the U-shaped sleeve 2.
Referring to fig. 5, the weight 33 is disposed such that the center of gravity G of the rotary latch 3 is offset from the rotation axis X0 and is located on the weight side (right side in fig. 5) of the rotation axis X0. In fig. 5, the weight portion 33 is a substantially rectangular block, and can play a weight role by increasing a volume, or can play a weight role by using a heavier material, so that the center of gravity of the rotary latch 3 is distributed to the right side with respect to the rotation axis X0. The weight 33 in the form of a rectangular block may also serve as a handle during installation operation, facilitating the installation operation.
The connecting portion 34 is provided to connect the extension bar 301 of the contact type high temperature extensometer 30. The clip assembly 1 of the extensometer auxiliary assembly 10 can be connected with the extension rod 301 by rotating the connecting portion 34 of the clip 3. Referring to fig. 9 in conjunction with fig. 5, the connecting portion 34 is provided with a limit groove 341 for fixing a limit by inserting and contacting the extension rod 301 of the contact type high temperature extensometer 30. In particular, the limit groove 341 is a sharp bottom groove, and is matched with the knife edge shape at the front end of the extension rod 301.
Referring to fig. 10, the rotation latch 3 includes a center portion, a left leg portion, a right leg portion, and a lower leg portion. The central portion of the rotating latch 3 constitutes a rotating portion 31. The left branch portion extends from the central portion toward the lower left side, constituting the crimping portion 32. The right branch portion extends from the center portion toward the right side, constituting a weight portion 33. The lower leg portion extends from the central portion towards the lower side, constituting a connection 34. Or, the left half of the rotating block 3 may be considered as being approximately V-shaped as a whole, and the corner of the V-shape has the feature of the rotating shaft 311, while the right half of the rotating block 3 is a rectangular section led out along the horizontal direction at the corner of the V-shape.
Referring to fig. 5, in conjunction with fig. 1 and 2, the rotating jaw 3 and the U-shaped socket 2 define a test piece channel P through which a test section 201 (test uniformity section) of the test piece 20 passes. The inner side edge 211 of the U-shaped cover 2 and the end side edge 321 of the crimp portion 32 are located on opposite sides of the test piece passage P. The end side knife edges 321 of the weight 33 holding crimp 32 tend to rotate to narrow the trial channel P so that the inner side knife edges 211 of the clevis 2 and the end side knife edges 321 of the crimp 32 press against the two opposing surfaces of the test section 201 of the trial 20 from both sides (left and right sides in fig. 5), respectively.
In fig. 5, the inner side edge 211 of the U-shaped sleeve 2 and the end side edge 321 of the crimping portion 32 press the test section 201 of the test piece 20 from both sides at the same height.
In the test installation process, the test piece 20 is vertically installed on the upper clamp and the lower clamp of the testing machine. Then, placing or clamping the U-shaped sleeve 2 at the upper end of the testing section 201 of the test piece 20, so that the inner side knife edge 211 is in close contact with the surface of the testing section 201 of the test piece 20; the rotary latch 3 is then placed on the U-shaped housing 2 such that the rotary shaft 311 is seated in the circular arc groove 221, and then the rotary latch 3 is adjusted by rotating about the rotary axis X0 such that the end-side edge 321 is pressed in contact with the surface of the test section 201 of the test piece 20. Under the above state, the gravity center of the rotating fixture block 3 is influenced by the right distribution of the gravity center relative to the rotating axis X0, the rotating fixture block 3 tends to rotate clockwise, and under the limiting action of the surface of the test piece testing section 201, a certain pressing force and a certain friction force are generated between the knife edge of the buckle assembly 1 and the surface of the testing section 201, so as to maintain the limiting fixation of the buckle assembly 1 (the U-shaped sleeve 2 and the rotating fixture block 3) on the surface of the test piece. In the above-described mounting sequence, the mounting and positioning of the other set of snap assemblies 1 is also performed at the lower end of the test section 201 of the test piece 20. The distance between the corresponding knife edges of the two sets of buckle assemblies 1 along the long axis direction (up and down direction) of the test piece 20 is the same as the initial gauge length of the contact type high-temperature extensometer. Finally, the front end or the tip end of the extension rod 301 of the contact type high-temperature extensometer 30 is respectively inserted into the limiting grooves 341 of the upper and lower sets of buckle components 1, and the relative position between the extension rod 301 and the buckle components 1 is fixed by inserting the groove limiting mode; at the same time, a certain amount of axial pressure is applied, or, in other words, the pressure required for additional mounting stops is provided to the snap assembly 1. To this end, the mounting limit of the extension rod 301 of the high temperature extensometer 30 on the surface of the test section 201 of the test piece 20 is completed by means of the buckle assembly 1. And subsequently, heating and loading tests can be carried out, and the test can be completed and then the test piece is disassembled according to the reverse order of installation.
In the loading process, the variation of the relative position between the upper and lower two buckle assemblies 1 is the loaded deformation of the material in the test section 201 of the test piece 20, the upper and lower two buckle assemblies 1 simultaneously drive the position change of the front ends of the upper and lower two extension rods 301, and then the loaded deformation of the material in the test gauge length section is equivalently transmitted to the high-temperature extensometer 30 for measurement and recording.
Fig. 5 also shows a force analysis schematic of the snap assembly 1. In the attached state, the tumbler 3 is rotated clockwise about the rotation axis X0 by the eccentric weight G of the tumbler 3, so that the press-contact portion 32 having the end-side edge 321 tends to move upward and leftward. However, due to the limiting effect of the surface of the testing section 201 of the test piece 20, the end-side knife edges 321 and the surface of the test piece 20 will be pressed and pressed to generate the pressing force F2, and corresponding friction force will be generated between the two. Meanwhile, the rotating fixture block 3 applies a rightward acting force to the wall surface of the arc groove 221 and the U-shaped sleeve 2 through the rotating shaft 311, and in order to achieve self-stress balance, the inner knife edge 211 of the bottom 21 of the U-shaped sleeve 2 will cling to the surface of the test piece testing section 201 and generate a pressing force F1 and a corresponding friction force.
Furthermore, the extension rod 301 in the region of the stop recess 341 also exerts an axial pressure force Fp on the rotary latch 3, which, in the same way as the eccentric weight G, increases the pressing forces F1 and F2 and the corresponding friction forces in the knife edge position in a similar manner. The pressing force and the friction force generated between the knife edge and the surface of the test piece testing section 201 can realize the limit fixation of the buckle assembly 1 and the extension rod 301 of the contact type high-temperature extensometer 30 on the surface of the test piece testing section 201. The upper and lower buckle components 1 are subject to follow-up deformation along with the material of the tested part testing section 201 in the testing process, and then the position of the tip of the extension rod 301 is driven to change to complete the measurement of the high-temperature deformation of the material. The material of the buckle assembly 1 can be the same as or similar to the material of the extension rod 301, and has the same or better high-temperature resistance, and the buckle assembly does not deform or damage under a high-temperature test environment, so that the corresponding deformation measurement accuracy is ensured. For example, the extensometer auxiliary assembly 10 may be made of a ceramic material, including the clevis 2 and the rotating dog 3. Thus, the extensometer auxiliary assembly 10 can be used in high temperature testing environments that metal components cannot withstand.
The magnitude of the pressing forces F1 and F2 and the magnitude of the corresponding friction force can be positively correlated with the magnitude of the axial pressure Fp provided by the extension rod 301, and the adjustment of the pressing forces F1 and F2 and the magnitude of the corresponding friction force can be completed by adjusting the magnitude of the axial pressure Fp provided by the extension rod 301, so as to meet different test requirements.
For example, as shown in fig. 9, more than one (two, or more than two, for example, three or four) limit grooves 341 may be formed in the vertical direction (up-down direction) of the rotary latch 3, and the pressing forces F1 and F2 and the magnitude of the corresponding friction force may be adjusted by selecting different limit grooves 341 and inserting the extension rod 301.
The extensometer auxiliary assembly 10 described above has a particular structural form, and the end side knife edge is held by the counterweight portion with a tendency to rotate in a direction that narrows the test piece passage, so that the inner knife edge 211 and the end side knife edge 321 press against the two opposite surfaces of the test section 201 from the two sides of the test piece 20, respectively.
The extensometer auxiliary assembly 10 can also realize contact compaction between the knife edge and the surface of a test piece through the pressure provided by the extension rod. The extensometer auxiliary assembly 10 can increase the contact area and the contact area between the material surface of a test piece and the extension rod of the contact type high-temperature extensometer, and can increase the contact pressing force with adjustable value so as to prevent the relative sliding between the buckle assembly and the material surface. The buckle assembly further has a limiting groove feature and can be used for inserting and limiting the top end of an extension rod of the contact type high-temperature extensometer.
By introducing the extensometer auxiliary assembly 10, the limit fixation of the contact type high-temperature extensometer extension rod between the upper end material surface and the lower end material surface of a test piece test gauge length section in a material high-temperature mechanical test can be completed; the sliding risk between the contact area and the contact area can be reduced and the failure of deformation measurement can be avoided by increasing the contact pressing force with adjustable numerical value, the success rate of high-temperature quasi-static mechanics tests is obviously improved, the test cost is further reduced, the installation and operation difficulty of the contact type high-temperature extensometer can be reduced, and the high-temperature quasi-static mechanics performance test of materials can be efficiently carried out.
Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.
Claims (9)
1. An extensometer auxiliary assembly is used for being matched with a contact type high-temperature extensometer to perform a high-temperature mechanical test, and is characterized by comprising a buckle assembly, wherein the buckle assembly comprises a U-shaped sleeve and a rotating clamping block;
the U-shaped sleeve is provided with a bottom and two side parts which form a U-shaped shape, and the bottom is provided with an inner knife edge;
the rotating block has:
the rotating part is arranged between the two side parts and is respectively and rotatably matched with the two side parts, so that a rotating axis of the rotating fixture block is limited;
a crimping portion opposite the bottom portion and having an end side blade;
a weight portion provided such that a center of gravity of the rotating cartridge is offset from the rotation axis and located on a weight portion side of the rotation axis; and
the connecting part is arranged to be connected with an extension rod of the contact type high-temperature extensometer, the rotating clamping block and the U-shaped sleeve limit a test piece channel for a test section of a test piece to pass through, the inner side knife edge and the end side knife edge are positioned on two opposite sides of the test piece channel, and the counterweight part keeps the end side knife edge to rotate so as to reduce the trend of the test piece channel, so that the inner side knife edge and the end side knife edge respectively press two opposite surfaces of the test section of the test piece from two sides of the test piece.
2. The extensometer assistance assembly of claim 1 wherein,
u type cover two lateral parts are every all including having open-ended circular arc groove, rotate the fixture block the rotation portion all includes the pivot in both sides, the rotation portion passes through the pivot is followed the opening card is gone into circular arc groove and rotationally arrange in between two lateral parts.
3. The extensometer assist assembly of claim 2,
every the lateral part comprises horizontal arm and arc arm, the one end of horizontal arm is connected the bottom of U type cover, the other end of horizontal arm is connected the arc arm, the arc arm bending forms the circular arc groove.
4. The extensometer assistance assembly of claim 1 wherein,
the inner side knife edge and the end side knife edge tightly press the test section of the test piece from two sides at the same height.
5. The extensometer assistance assembly of claim 1 wherein,
the rotary latch includes a center portion, a left leg portion extending toward a left lower side from the center portion, a right leg portion extending toward a right side from the center portion, and a lower leg portion extending toward a lower side from the center portion, the left leg portion, the right leg portion, and the lower leg portion respectively constituting the rotary portion, the crimping portion, the weight portion, and the connecting portion of the rotary latch.
6. The extensometer auxiliary assembly of claim 1, wherein the connecting portion is provided with a limit recess for fixing a limit by inserting and contacting engagement with an extension rod of the contact high temperature extensometer.
7. The extensometer assist assembly of claim 1 wherein the extensometer assist assembly is made of a ceramic material.
8. The extensometer assist assembly of claim 1 including two of the snap assemblies.
9. A high temperature mechanical test device, includes contact high temperature extensometer, contact high temperature extensometer has two extension rods, its characterized in that still includes the extensometer auxiliary assembly of any one of claims 1 to 8, the buckle subassembly of extensometer auxiliary assembly passes through the connecting portion of rotating the fixture block connect the extension rod.
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| CN201911023767.5A CN112710559B (en) | 2019-10-25 | 2019-10-25 | High-temperature mechanical test device and extensometer auxiliary assembly thereof |
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| CN201911023767.5A CN112710559B (en) | 2019-10-25 | 2019-10-25 | High-temperature mechanical test device and extensometer auxiliary assembly thereof |
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| CN112710559B true CN112710559B (en) | 2022-06-24 |
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