CN112067454B - Extensometer anti-slip device in high-temperature extensometer Gao Wenzhun static loading test - Google Patents
Extensometer anti-slip device in high-temperature extensometer Gao Wenzhun static loading test Download PDFInfo
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- CN112067454B CN112067454B CN201910496434.8A CN201910496434A CN112067454B CN 112067454 B CN112067454 B CN 112067454B CN 201910496434 A CN201910496434 A CN 201910496434A CN 112067454 B CN112067454 B CN 112067454B
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- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 230000003068 static effect Effects 0.000 title claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims abstract description 48
- 230000005484 gravity Effects 0.000 claims abstract description 13
- 238000003780 insertion Methods 0.000 claims abstract description 8
- 230000037431 insertion Effects 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 125000006850 spacer group Chemical group 0.000 claims description 8
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 24
- 238000009434 installation Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 230000002265 prevention Effects 0.000 description 8
- 230000000670 limiting effect Effects 0.000 description 7
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- 230000000694 effects Effects 0.000 description 1
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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
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an anti-slip device of an extensometer in a high Wen Zhun static loading test, which comprises a clamping piece, wherein one end of the clamping piece is provided with a U-shaped clamping groove, and the other end of the clamping piece is provided with a balancing weight; the three inner sides of the U-shaped clamping groove are provided with knife edges; the balancing weight is arranged so that the gravity center of the clamping piece in the horizontal placement state is a certain distance from the symmetrical center line of the U-shaped clamping groove in the horizontal direction; the clamping piece is provided with a connecting device at the back of the rear inner side of the bottom side of the U-shaped clamping groove, and the connecting device is used for being in insertion contact fit with the front end of the ceramic extension rod of the high-temperature extensometer to fix and limit. The invention also provides a high-temperature extensometer comprising the anti-slip device. The anti-slip device can reduce the slip risk between the ceramic extension rod of the high-temperature extensometer and the surface of the tested piece material.
Description
Technical Field
The invention relates to a high-temperature extensometer, in particular to an anti-slip device of the extensometer in a high Wen Zhun static loading test.
Background
Along with the continuous improvement of the design and use temperature of the novel high-temperature structural material, a high-temperature extensometer is required to be used for measuring the quasi-static loaded deformation data of the material at a very high ambient temperature. For example, ceramic matrix composites with wide application prospects in the aerospace field, the test temperature of their high temperature mechanical properties is typically 1200 ℃ or even higher. The currently used contact type high-temperature extensometer is characterized in that two measuring arms are respectively provided with a ceramic extension rod, the tip end of the front end of each ceramic extension rod is contacted with the surface of a tested piece of material and positioned by virtue of friction force, and further the measurement and transmission of the loaded deformation of the material in a testing gauge length section are completed, wherein the ceramic extension rods are made of ceramic materials. Only the front half part of the ceramic extension rod is in a high-temperature environment in the test process.
However, the inventor finds that the contact area and friction force between the front end of the high-temperature ceramic extension rod and the surface of the material are small, so that relative slipping easily occurs in the test process, thereby causing failure in measuring deformation, further reducing the success rate of the test and increasing the cost of the test.
Disclosure of Invention
An object of the present invention is to reduce the risk of slippage between the ceramic extension rod of a high temperature extensometer and the surface of the material being tested.
The invention provides an anti-slip device of an extensometer in a high Wen Zhun static loading test, which comprises a clamping piece, wherein one end of the clamping piece is provided with a U-shaped clamping groove, and the other end of the clamping piece is provided with a balancing weight; the three inner sides of the U-shaped clamping groove are respectively provided with a knife edge, and the width between the left knife edge of the left inner side of the U-shaped clamping groove and the right knife edge of the right inner side of the U-shaped clamping groove is set to allow a test gauge length section of a tested piece to be clamped into the U-shaped clamping groove; the balancing weights are arranged so that the gravity center of the clamping piece in the horizontal placement state and the symmetrical center line of the U-shaped clamping groove are at a certain distance in the horizontal direction, and when the clamping piece is clamped on the test gauge length section of the tested piece, the left knife edge and the right knife edge can generate compression force and friction force between the surfaces of the left knife edge and the right knife edge corresponding to the two sides of the test gauge length section of the tested piece, and the clamping piece is restrained and fixed on the test gauge length section of the tested piece without relative sliding by means of the compression force and the friction force; the clamping piece is provided with a connecting device on the back of the rear inner side edge of the bottom side of the U-shaped clamping groove, and the connecting device is used for being in insertion contact fit with the front end of the ceramic extension rod of the high-temperature extensometer to fix and limit.
In one embodiment, the clamping piece comprises a thickness cushion block, and the left or right inner side edge of the U-shaped clamping groove is provided by a detachable thickness cushion block.
In one embodiment, the clamping member comprises a clamping member body and a thickness cushion block, wherein the clamping member body is provided with the U-shaped clamping groove and the balancing weight, the thickness cushion block is detachably attached to the left or right inner side edge of the U-shaped clamping groove, and the thickness cushion block provides a cushion block knife edge capable of replacing a left knife edge or a right knife edge.
In one embodiment, the connection means is a recess provided in the rear face, the recess being adapted for insertion of the front end of the ceramic extension rod.
In one embodiment, the slip prevention device is made of a ceramic material.
In one embodiment, the weight is integrally formed with the U-shaped slot.
In one embodiment, the center of gravity of the balancing weight is located further forward than the rear inner side of the U-shaped clamping groove.
In one embodiment, the slip prevention device comprises two of the clamping members.
The invention provides a high-temperature extensometer which comprises two ceramic extension rods and the anti-slip device, wherein the front ends of the two ceramic extension rods are respectively connected with the connecting devices of two clamping pieces of the anti-slip device.
In one embodiment, the balancing weights of the two clamping pieces are respectively positioned at the left side and the right side relative to the test gauge length of the tested piece.
By adopting the extensometer anti-slip device in the Gao Wenzhun static loading test, the risk of slipping between the ceramic extension rod and the tested piece can be obviously reduced, or the ceramic extension rod is prevented from slipping, so that failure of deformation measurement is avoided, the success rate of a high-temperature mechanical test is obviously improved, and the test cost is further reduced. And moreover, by introducing the test piece connecting device, the relative limiting fixation between the ceramic extension rod and the surface of the test piece material can be realized in a high-temperature environment, and the installation and operation difficulty of the high-temperature extensometer can be reduced.
Moreover, in the test piece connecting device, the clamping piece with the three-side knife edge structure mode in U-shaped distribution is designed, the compaction contact between the three-side knife edge and the surface of the tested material is realized by means of the jacking force of the high-temperature extensometer and the self gravity of the clamping piece, and then the relative sliding between the ceramic clamping piece and the surface of the material is prevented by increasing the contact area and the contact area. The back of the clip has a connection means such as a groove feature that can be used for insertion limiting of the ceramic extension rod of the pyrometer.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:
fig. 1 is a side rear view showing an installation state of the slip preventing device and the ceramic extension rod.
Fig. 2 is a side front view showing an installation state of the slip preventing device and the ceramic extension rod.
Fig. 3 is a side front view of the clip.
Fig. 4 is a top view of the clip.
Fig. 5 is a side rear view of the clip.
Fig. 6 is a schematic diagram of the shape and position change of the clamping member during the installation process.
Fig. 7 is a force-receiving schematic view of the clip in an installed state when viewed from the front side.
Fig. 8 is a force-receiving schematic view of the clip in an installed state when seen from the underside.
Detailed Description
The present invention will be further described with reference to the following detailed description and the accompanying drawings, in which more details are set forth in order to provide a thorough understanding of the present invention, but it will be apparent that the present invention can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present invention, and therefore should not be limited in scope by the context of this detailed description.
For example, a first feature described later in this specification may be formed above or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, as well as embodiments in which additional features are formed between the first and second features, such that no direct contact between the first and second features is possible. In addition, the disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, where a first element is described as being coupled or combined with a second element, the description includes embodiments in which the first and second elements are directly coupled or combined with each other, and also includes embodiments in which one or more other intervening elements are added to indirectly couple or combine the first and second elements with each other.
As used herein, the terms "a," "an," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
For ease of description, spatially relative terms such as "under", "below", "beneath", "above", "upper" 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. It will be understood that these spatially relative terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary words "below" and "beneath" can encompass both an orientation of above and below. The device may have other orientations (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein interpreted accordingly. Furthermore, it will be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
It is noted that these and other figures are merely examples, which are not drawn to scale and should not be construed as limiting the scope of the invention as it is actually claimed. In addition, the conversion modes in the different embodiments may be appropriately combined.
Referring to fig. 1, for convenience of description, the front-rear direction D1, the left-right direction D2, and the up-down direction D3 are shown. The high temperature extensometer 100 generally includes two ceramic extension rods 101, 102. In the high Wen Zhun static loading test, the two ceramic extension rods 101, 102 are distributed in the up-down direction D3, and the two ceramic extension rods 101, 102 can follow the loaded deformation of the material of the test gauge length 201 of the tested piece 20, so that the measurement of the high-temperature deformation of the material is completed through the position change of the front ends 101a, 102a of the two ceramic extension rods 101, 102. The test gauge length section 201 of the test piece 20 under test is typically a test uniform section of the test piece 20 under test.
Fig. 1 and 2 show side rear and side front views of the installation state of the extensometer slip prevention device 10 (hereinafter, abbreviated as slip prevention device 10) and the ceramic extension rods 101, 102 of the high temperature extensometer 100 on the test gauge length 201 of the tested piece 20 in the high Wen Zhun static load test. The anti-slip device 10 may also be considered to be included in the high temperature extensometer 100. The slip prevention device 10 includes the clip 1. In the embodiment shown in fig. 1 and 2, the slip prevention device 10 further comprises a clamping member 1 'having the same structure as the clamping member 1, i.e. the slip prevention device 10 comprises two clamping members 1, 1'.
Fig. 3, 4 and 5 show example structures of the joint 1 from different angles. One end (right end in fig. 4) of the clamping piece 1 is provided with a U-shaped clamping groove 2, and the other end (left end in fig. 4) is provided with a balancing weight 3. In other words, in fig. 4, the clamping member 1 includes a clamping groove portion 7 at the right end and a balancing weight 3 at the left end, and the u-shaped clamping groove 2 is disposed in the clamping groove portion 7.
The three inner sides (i.e., left inner side 21 on the left side, right inner side 22 on the right side, and rear inner side 23 on the bottom or rear side) of the U-shaped card slot 2 each have a width (i.e., dimension in the left-right direction D2 in fig. 4) between the left and right inner sides (i.e., left inner side 21, left edge 24 and right edge 25) of the U-shaped card slot 2, i.e., left and right inner sides 21, 22, of the U-shaped card slot 2, respectively, such that the width between the left and right edges 24, 25 of the U-shaped card slot 2 is slightly larger than the width of the test gauge section 201 of the test piece 20 to be tested.
The balancing weight 3 is arranged such that the center of gravity of the clamping member 1 in the horizontal placement state is a certain distance from the symmetry center line C1 of the U-shaped clamping groove 2 in the horizontal direction, i.e. in the left-right direction D2 in fig. 4. The symmetry center line C1 extends along the front-rear direction D1, and the left blade 24 and the right blade 25 are symmetrical in the horizontal direction or the left-right direction D2 with the symmetry center line C1, that is, the left blade 24 is the same distance from the symmetry center line C1 in the left-right direction D2 as the right blade 25 is from the symmetry center line C1 in the left-right direction D2. In the illustrated embodiment, the weight 3 moves the center of gravity of the clip 1 in the horizontally placed state toward the weight 3 side, i.e., the left side, with respect to the center line of symmetry C1. The center of gravity of the clamping piece 1 in the horizontal placement state is a certain distance from the symmetrical center line C1 of the U-shaped clamping groove 2 in the horizontal direction, so that when the clamping piece 1 is clamped on the test gauge section 201 of the tested piece 20, the left knife edge 24 and the right knife edge 25 generate compression force and friction force with the corresponding two side surfaces of the test gauge section 201 of the tested piece 20, namely the left side surface 202 and the right side surface 203 of fig. 2, and the clamping piece 1 is restrained and fixed on the test gauge section 201 of the tested piece 20 without relative sliding by means of the compression force and the friction force.
The clamping piece 1 is provided with a connecting device at the inner side of the bottom side (namely, the bottom side of the U-shaped, the rear side in fig. 4) of the U-shaped clamping groove 2, namely, the back surface 27 of the rear inner side 23, and the connecting device is used for being in inserted contact fit with the front ends 101a and 102a of the ceramic extension rods 101 or 102 of the high-temperature extensometer 100 to fix and limit. Referring to fig. 5, the connection means is a recess 61 (or receptacle) provided in the back surface 27. The recess 61 is adapted for insertion of the front end 101a, 102a of the ceramic extension rod 101 or 102. The recess 61 may be shaped to match the shape, e.g., tapered, of the front end 101a, 102a of the ceramic extension rod 101 or 102 for insertion thereof. The front ends 101a and 102a of the ceramic extension rods 101 and 102 are inserted into the grooves 61, the front ends 101a and 102a of the ceramic extension rods 101 and 102 are connected with the clamping piece 1 from the rear side so as to realize limit fixation between the ceramic extension rods 101 and 102 and the clamping piece 1, the ceramic extension rods 101 and 102 can follow the clamping piece 1, and the ceramic extension rods 101 and 102 can apply compression force to the clamping piece 1 from the rear side, so that compression force and friction force between the rear knife edge 26 and the test gauge length section 201 of the tested piece 20 are increased.
Referring to fig. 2 to 4, the clip 1 may further include a thickness spacer 4,U, wherein the left or right inner side of the clip groove 2, i.e., the left inner side 21 or the right inner side 22, is provided by the detachable thickness spacer 4, and in the illustrated embodiment, the left inner side 21 of the U-shaped clip groove 2 is provided by the detachable thickness spacer 4. At this time, the left edge 24 of the U-shaped clamping groove 2 is also a cushion block edge of the thickness cushion block 4. The width (i.e., the dimension in the left-right direction D2 in fig. 4) between the pad or left edge 24 of the thickness pad 4 and the right edge 25 of the U-shaped clamping groove 2 (or clamping groove portion 7) is set to allow the test gauge section 201 of the test piece 20 to be clamped therein. For example, for a tested piece having different test gauge section widths, thickness pads 4 having different thicknesses may be selected, i.e., thickness pads 4 having different thicknesses may be selected according to the width of test gauge section 201 of tested piece 20, such that the width between left edge 24 of thickness pad 4 and right edge 25 of clamping groove portion 7 is slightly greater than the width of test gauge section 201 of tested piece 20, so that test gauge section 201 of tested piece 20 may be clamped therein.
In the illustrated embodiment, the clip 1 includes a clip body 8 and a thickness block 4. The clip body 8 has a U-shaped clip groove 2 (or clip groove portion 7) and a weight 3, and the thickness block 4 is provided to be detachably attached (detached/attached) to the left or right inner side (left inner side 21 in the drawing) of the U-shaped clip groove 2, and the thickness block 4 provides a block blade that can replace the left blade or right blade (left blade in the drawing), that is, as shown, the block blade of the thickness block 4 replaces the original left blade of the U-shaped clip groove 2 to become the left blade 24, and therefore, the block blade of the thickness block 4 is hereinafter referred to as the left blade 24, and the original left blade of the U-shaped clip groove 2 is referred to as the engaging blade 211 for distinguishing illustration. At this time, when the width of the test gauge length 201 of the test piece 20 to be tested is slightly larger than the widths of the engaging edge 211 and the right edge 25 of the joint body 8, the joint body 8 may be directly used without using the thickness pad 4, that is, the engaging edge 211 of the joint body 8 serves as the left edge 24. When the width of the test gauge section 201 of the tested piece 20 is larger than the width of the joint knife edge 211 and the right knife edge 25 of the clamping piece body 8, a cushion block 4 with proper thickness is selected, and at the moment, the cushion block knife edge of the cushion block 4 just acts as a left knife edge 24 to be contacted with the test gauge section 201 of the tested piece 20.
In the illustrated embodiment, the thickness block 4 is provided as a V-shaped member with an inner surface 41 that engages the engagement edge 211 of the clip body 8. The thickness block 4 has a V-shaped inner surface 41 and a V-shaped outer surface 42, and the thickness block 4 may be stacked on the engagement edge 211 of the clip body 8 by the inner surface 41 being in abutment with the engagement edge 211 of the clip body 8.
Fig. 6 is a schematic diagram showing a shape and position change of the clamping member 1 of the anti-slip device 10 during the installation process, wherein a dotted line is a horizontally placed state of the clamping member 1, and a solid line is an installation completed state of the clamping member 1. Fig. 7 and 8 are respectively force-receiving diagrams of the joint member 1 in the mounted state when seen from the front side and the lower side.
In the process of mounting, referring to fig. 6 to 8, the clamping member 1 is firstly placed horizontally at the upper end of the test gauge length section 201 of the tested member 20, so that the clamping member body 8 of the clamping member 1 or the right edge 25 of the clamping groove portion 7 contacts the surface of the tested member 20, the tested member 20 will generate a normal reaction force F1 and a static friction force T1 on the right edge 25, and then the thickness cushion block 4 is placed between the joint edge 211 of the clamping member body 8 and the test gauge length section 201 of the tested member 20 according to the state shown by the dotted line in fig. 6, namely, the horizontally placed state. Then, the clamping piece 1 is loosened, and due to the effect of the balancing weight 3, the gravity center of the clamping piece 1 is not overlapped with the symmetrical center line C1 of the U-shaped clamping groove 2 in the horizontal direction, the clamping piece 1 rotates clockwise in the figure 6 under the combined effect of the gravity G and the static friction force T1, in other words, the clamping piece 1 generates a turning motion trend, and after the clamping piece rotates by a small angle, a cushion block knife edge or a left knife edge 24 of the thickness cushion block 4 contacts with the upper end material surface of the test gauge length section 201 of the tested piece 20, and generates a normal counter force F2 and the static friction force T2 to prevent the continuous rotation of the clamping piece 1, in other words, the test gauge length section of the tested piece generates a limiting effect on the clamping piece 1 to limit the turning motion trend. In the installation state, the rotation angle is very small, so that the right knife edge 25 and the left knife edge 24 are basically positioned on the same horizontal height, and a small height difference will not cause a large error on the measurement result, and meanwhile, the relative fixation of the clamping piece 1 on the tested piece 20 is not influenced.
Under the combined action of the forces F1, T1, F2, T2 and G, the clamping member 1 will be in a force balance state and clamped and fixed at the upper end of the test gauge length section 201 of the tested member 20. Another clip 1' may be installed at the lower end of the test gauge section 201 of the test piece 20 under test in the same operation. Finally, the two ceramic extension rods 101 and 102 of the high-temperature extensometer 100 are respectively inserted into the grooves 61 corresponding to the clamping pieces 1 and 1', so as to finish the fixing and limiting of the two; meanwhile, the ceramic extension rods 101 and 102 apply a pressing force Fd to the clamping pieces 1 and 1' towards the front side in the axial direction, namely the front-back direction D1 in the drawing, so that the surface of the tested piece testing gauge length section 21 material can generate a reaction force F3 and a friction force T3 on the rear edge 26 of the clamping pieces 1 and 1', and the fixing limit between the clamping pieces 1 and 1' and the tested piece 20 is firmer under the action of T3. So far, the limiting and fixing between the ceramic extension rods 101 and 102 of the high-temperature extensometer 100 and the tested piece 20 is completed by the clamping pieces 1 and 1'. Subsequent temperature rise and load testing may be performed. In the testing process, the upper clamping piece 1 and the lower clamping piece 1' follow up along with the loaded deformation of the materials of the testing gauge length section 201 of the tested piece 20, and further drive the front ends 101a and 101b or the tip positions of the ceramic extension rods 101 and 102 to change so as to finish the measurement of the high-temperature deformation of the materials. And after the test is finished, the disassembly is carried out according to the reverse order of installation.
The slip prevention device 10 (or the joint 1) may be made of a ceramic material. In the test process, the front ends 101a and 102a of the clamping piece 1 and the ceramic extension rods 101 and 102 are completely in a high-temperature environment, so that deformation and damage are not easy to occur in the high-temperature test environment, and corresponding deformation measurement accuracy is ensured. The anti-slip device 10 may be made of the same or similar material as the ceramic extension rods 101, 102 of the pyrometer 100, and may have equal or superior resistance to high temperatures.
In the illustrated embodiment, the weight 3 is integrally formed with the U-shaped card slot 2 (or the card slot portion 7). The counterweight 3 can also be used as a handle for holding the anti-slip device 10 during installation and can be designed in a shape suitable for holding. In the illustrated embodiment, the height dimension of the weight 3 in the up-down direction D3 is larger than the height dimension of the card slot portion 7 in which the U-shaped card slot 2 is provided, the width dimension of the weight 3 in the left-right direction D2 is slightly smaller than the width dimension of the card slot portion 7, and the thickness dimension of the weight 3 in the front-rear direction D1 is approximately equal to the thickness dimension of the card slot portion 7.
Referring to fig. 4, the center of gravity of the weight 3 is located further forward than the bottom or rear inner side 26 of the U-shaped slot 2. In this way, when the U-shaped clamping groove 2 of the clamping piece 1 is clamped with the test gauge length section 201 of the tested piece 20, the gravity center of the balancing weight 3 can be aligned with the center of the test gauge length section 201 of the tested piece 20 in the front-back direction D1, so that the balancing weight function is better achieved.
Returning to fig. 1 and 2, the front ends 101a, 102a of the two ceramic extension rods 101, 102 of the pyrometer 100 are respectively connected with the two clamping pieces 1, 1' (in particular, the connecting means or grooves 61 thereof) of the anti-slip device 10. In the illustrated embodiment, the weights 3 of the two engaging pieces 1 and 1' are located on the left and right sides with respect to the test piece 20 (or the test gauge length 201).
The anti-slip device 10 can assist in completing the limit fixation of the ceramic extension rods 101 and 102 of the high-temperature extensometer 100 between the surfaces of the materials at the upper end and the lower end of the test gauge length section 201 of the tested piece 20 in the static mechanical test of the material height Wen Zhun. In the loading process, the change of the relative position between the upper clamping piece 1 and the lower clamping piece 1, 1 'is the loaded deformation of the material in the test gauge length section 201 of the tested piece 20, the upper clamping piece 1 and the lower clamping piece 1' drive the position change of the front ends 101a, 101b of the upper ceramic extension rods 101, 102 at the same time, and then the loaded deformation of the material in the test gauge length section 201 is equivalently transmitted to the high-temperature extensometer 100 for measurement and recording.
The use of the anti-slip device increases the contact area and the contact area between the surface of the measured material and the ceramic extension rod of the high-temperature extensometer, can obviously reduce the slip risk between the ceramic extension rod and the ceramic extension rod, avoid failure of deformation measurement, has beneficial effects on improving the success rate of a high-temperature mechanical test of the material and reducing the test cost, and simultaneously reduces the installation and operation difficulty of the high-temperature extensometer, thereby being beneficial to the efficient development of the high-temperature mechanical property test work of the material.
While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, as will occur to those skilled in the art, without departing from the spirit and scope of the invention. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The anti-slip device of the extensometer in the high Wen Zhun static loading test is characterized by comprising a clamping piece, wherein one end of the clamping piece is provided with a U-shaped clamping groove, and the other end of the clamping piece is provided with a balancing weight; the three inner sides of the U-shaped clamping groove are respectively provided with a knife edge, and the width between the left knife edge of the left inner side of the U-shaped clamping groove and the right knife edge of the right inner side of the U-shaped clamping groove is set to allow a test gauge length section of a tested piece to be clamped into the U-shaped clamping groove;
the balancing weights are arranged so that the gravity center of the clamping piece in the horizontal placement state and the symmetrical center line of the U-shaped clamping groove are at a certain distance in the horizontal direction, and when the clamping piece is clamped on the test gauge length section of the tested piece, the left knife edge and the right knife edge can generate compression force and friction force between the surfaces of the left knife edge and the right knife edge corresponding to the two sides of the test gauge length section of the tested piece, and the clamping piece is restrained and fixed on the test gauge length section of the tested piece without relative sliding by means of the compression force and the friction force;
the clamping piece is provided with a connecting device on the back of the rear inner side edge of the bottom side of the U-shaped clamping groove, and the connecting device is used for being in insertion contact fit with the front end of the ceramic extension rod of the high-temperature extensometer to fix and limit.
2. The device for preventing the extensometer from slipping in a Gao Wenzhun static loading test of claim 1 wherein the snap-fit member comprises a thickness spacer and the left or right inner side of the U-shaped snap-fit channel is provided by a removable thickness spacer.
3. The device for preventing slippage of an extensometer in a Gao Wenzhun static loading test of claim 1 wherein the snap-in member comprises a snap-in member body having the U-shaped slot and the weight, and a thickness spacer disposed to be removably attached to a left or right inner side of the U-shaped slot, the thickness spacer providing a spacer blade that can replace either a left blade or a right blade.
4. The device for preventing slippage of an extensometer in a static loading test according to claim 1 wherein said connecting means is a groove provided on said back surface, said groove being adapted for insertion of the front end of said ceramic extension rod.
5. The extensometer slip-resistant apparatus of claim 1 wherein the apparatus is made of a ceramic material.
6. The device for preventing the extensometer from slipping in a Gao Wenzhun static loading test of claim 1 wherein said weight is integrally formed with said U-shaped slot.
7. The device for preventing the extensometer from slipping in a Gao Wenzhun static loading test of claim 1, wherein the center of gravity of the counterweight is more forward than the rear inner side of the U-shaped slot.
8. The extensometer slip-resistant apparatus of claim 1 wherein the apparatus includes two of the snap-fit members.
9. A high temperature extensometer comprising two ceramic extension bars, and further comprising an anti-slip device according to any one of claims 1 to 8, wherein the front ends of the two ceramic extension bars are respectively connected with the connecting device of the two clamping pieces of the anti-slip device.
10. The pyrometer of claim 9, wherein the weights of the two clamping members are located on the left and right sides, respectively, relative to the test gauge length of the test piece being tested.
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| CN201910496434.8A CN112067454B (en) | 2019-06-10 | 2019-06-10 | Extensometer anti-slip device in high-temperature extensometer Gao Wenzhun static loading test |
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| CN201910496434.8A CN112067454B (en) | 2019-06-10 | 2019-06-10 | Extensometer anti-slip device in high-temperature extensometer Gao Wenzhun static loading test |
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| CN113640144A (en) * | 2021-08-10 | 2021-11-12 | 中机试验装备股份有限公司 | High-temperature extension measuring device |
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