CN108225899A - With the composite thin plate drawing by high temperature test fixture and method from alignment function - Google Patents

With the composite thin plate drawing by high temperature test fixture and method from alignment function Download PDF

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Publication number
CN108225899A
CN108225899A CN201810001640.2A CN201810001640A CN108225899A CN 108225899 A CN108225899 A CN 108225899A CN 201810001640 A CN201810001640 A CN 201810001640A CN 108225899 A CN108225899 A CN 108225899A
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China
Prior art keywords
supporting block
collet
sample
snap ring
protective frame
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CN201810001640.2A
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CN108225899B (en
Inventor
石多奇
程震
沙景恬
腾雪峰
杨晓光
齐红宇
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Beihang University
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Beihang University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • 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
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • 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 present invention relates to a kind of composite thin plate drawing by high temperature test fixture and method having from alignment function, including hanging joint, collet, extension bar, snap ring, supporting block and protective frame；Upper and lower extension bar is connected by flexural pivot face with hanging joint, and two hanging joints are separately fixed on testing machine lower and upper cross-member；Each collet sets two supporting blocks in sample thickness direction front and rear surfaces, can be clamped by snap ring.The test fixture is connected by two flexural pivots with testing machine, can realize the automatic centering of extension test.Meanwhile snap ring under the effect of gravity can automatic clamping sample, and during sample heating and cooling thickness change realize automatic adjustment stablize clamping force.In addition, installing protective frame before on-test can accurately fix fixture collet up and down before testing machine is connected to, play the role of protecting thin sample.

Description

With the composite thin plate drawing by high temperature test fixture and method from alignment function
Technical field
The present invention relates to a kind of composite thin plate drawing by high temperature test fixtures and method having from alignment function, belong to The hot test field of composite material.
Background technology
Composite material has many advantages, such as high specific strength and specific stiffness, and mechanical property can design, apply and fly in aerospace Row device is with that in engine thermal end pieces, can realize the raising of engine performance and the mitigation of weight.Composite material, such as ceramic base Composite material etc., it is often to be applied in high-temperature component, load is born at high temperature.Therefore, test compound material is at high temperature Mechanical property be necessary, to composite material carry out drawing by high temperature test then be test the necessary experiment hand of its mechanical property Section.
With reference to the high temperature tension test standard ASTM C1359 of ceramic matric composite, since ceramic matric composite has The contact portion of brittleness, fixture and sample must be the face of even uniform, it is impossible to be point contact or line contact.Fixture can be big Cause is divided into active clamped contact face and passive two major class of clamped contact face.The fixture in active clamped contact face needs machinery, liquid Pressure or aerodynamic force clamp sample, additional device is needed to provide the pressure perpendicular to specimen surface, in sample and fixture Frictional force is generated on contact surface to clamp sample.Passive clamped contact face is that power is directly transmitted to sample by the connection of machinery On, such as the shaft shoulder or hole.For thin plate, trepanning can lead to stress concentration, and sample is caused to be destroyed.In addition, if trepanning is simultaneously It is fixed by pin, pin can be also easily deformed under high temperature, cause handling inconvenient.
Invention content
The deficiency of the present invention regarding to the issue above provides a kind of composite thin plate high temperature drawing having from alignment function Test fixture and method are stretched, which includes hanging joint 9, extension bar 8, protective frame 7, upper snap ring 3, lower snap ring 6, upper supporting block 2nd, lower supporting block 5, collet 1 and sample 4；
The hanging joint 9 includes upper hanging joint and lower hanging joint, and upper and lower mounting header structure is identical；Upper hanging joint and lower extension Connector hitching position is designed with concave spherical surface 19, and spherical radius is determined according to fixture design load, and cooling water is designed with above hitching position Mouth 20, hanging joint 9 are fixed on testing machine；
The extension bar 8 includes upper extension bar and lower extension bar, upper and lower connection rod structure are identical；Extension bar one end 21 be convex spherical, ruler Very little identical with radius at hanging joint concave spherical surface 19, extension bar 8 forms flexural pivot by concave, convex spherical surface 19,21 with hanging joint 9 and is connected It connects；The extension bar other end is external screw thread 22, and is being equipped with a pair of of spanner operation planar 23 close to the externally threaded position, and extension bar extends 24 length of section are determined according to high temperature furnace size, need to ensure convex spherical 21 outside high temperature furnace；
The collet 1 includes upper grip and lower collet, and upper and lower chuck structure is identical, the internal thread hole 25 and extension bar of collet 1 8 external screw thread 22 screws connection, and collet 1 is split type with extension bar 8, convenient for carrying out the replacement of collet according to different patterns；Collet External cylindrical surface far from bare terminal end is equipped with a collet in directly to the right and positions plane 11；
The upper supporting block 2 includes upper supporting block top 12 and upper supporting block lower part 13, and upper supporting block top 12 is square, Left and right end face is plane, and upper 13 left and right end face of supporting block lower part is arc surface；The lower supporting block 5 includes lower supporting block top 14 and lower supporting block lower part 15, lower 14 left and right end face of supporting block top is arc surface, and lower supporting block lower part 15 is square, left and right End face is plane；The respective composition inverted T-shaped of upper supporting block 2 and lower supporting block 5, two one group, be bonded respectively sample 4 front surface and Rear surface, left and right circular arc end face are flushed with sample.
Under sample loading state, upper supporting block 2 and lower supporting block 5 are placed on collet interior 16, upper supporting block 2 and lower supporting block 5 cross sectional shape is bonded to each other with 16 shape of collet interior, realizes being mutually located for supporting block and collet；Along sample thickness side To upper 13 circular arc portion of supporting block lower part thickeies, and lower 15 projected square part of supporting block lower part thickeies, and thickeies mode from top to bottom by solid Determine angle (recommending the sample binding face angle with supporting block at 3-6 °) inclined-plane gradually to thicken, finally constitute up-narrow and down-wide wedge Shape；
The upper snap ring 3 and lower snap ring 6 are all inverted U shape, upper and lower snap ring inner wall 17,18 inner surfaces from top to bottom according to The identical bevel angle in upper supporting block lower part 13 and lower supporting block lower part 15 is gradually thinned；It is packed under sample state, upper and lower snap ring By gravity, upper and lower snap ring inner wall 17,18 is fixed supporting block lower part 13 and lower supporting block lower part 15 respectively； And upper and lower snap ring top hollow cylindrical part 27,28 mutually agrees with external cylindrical surface 26 below collet, is achieved in snap ring and folder Head is mutually located, then by supporting block, realizes sample in 16 positioning in the front-back direction of collet interior.
Upper and lower snap ring 3 and 6 can not only pass through gravity Automatic-clamping sample 4, additionally it is possible to be pressed from both sides according to test temperature autobalance Clamp force, when the temperature of sample 4 and supporting block increases, the overall thickness of sample 4 and upper and lower supporting block 2 and 5 can increase, upper and lower to block The opposite supporting block of the meeting of ring 3 and 6 moves up, autobalance thickness direction clamping force.
The protective frame 7 is made of a connecting rod 29, the identical cross bar 30 of two root architectures and K-type hand nutting 31. The protective frame 7 finished is assembled, the protective frame positioning surface top 10a and protective frame positioning surface lower part 10b of two cross bars are flat at one On face.
Protective frame 7 is mounted on when sample is not loaded on collet 1 before on-test；By unscrewing K-type hand nutting 31, Semi-ring 32 is opened, cross bar 30 can be inserted in collet 1, then lock K-type hand nutting 31.Protective frame positioning surface 10 is positioned with collet Plane 11, which cooperates, to be positioned, by collet above and below protective frame positioning surface top 10a and protective frame positioning surface lower part 10b realizations It is circumferentially positioned.
Upper and lower collet 1 and to screw connected extension bar 8 with collet 1 integral by 7 shape of protective frame of loading, herein Sample 4, upper and lower supporting block 2,5 and upper and lower snap ring 3,6, the convex ball that integral clamp then is passed through extension bar 8 are installed under state Face 21 is packed into the 9 inside concave spherical surface 19 of hanging joint mounted on testing machine, increases testing machine crossbeam, and bumps flexural pivot face is just opened up and down When beginning to contact, K-type hand nutting 31 is unscrewed, semi-ring 32 is opened, removes protective frame 7.Protective frame is mounted on folder before on-test On tool, sample can be protected, after entirely installation is complete in fixture, can fixture overall movement be installed to by experiment by protective frame It on machine, during on-test, then is dismantled, can ensure the accuracy of installation.
During experiment, to cause displacement and power even if there are deviations 9 orientation of hanging joint up and down and angle of testing machine Not on a vertical line, the presence in extension bar flexural pivot face can also realize that collet is during the experiment from centering up and down for loading, it is ensured that The accuracy of result of the test.
In composite material high temperature tension test, specimen shape is dumbbell shaped, including two gripping sections 33, two changeover portions 34 and intermediate gauge length section 35.34 or so end face of changeover portion is arc-shaped.
The specific installation method of the fixture is：
1) by one of loading upper grip card slot of two upper supporting blocks, the gripping section of sample is close to supporting block Installation, then another loading of two upper supporting blocks is compressed into sample holder section.
2) snap ring is inserted in from upper grip upper end on, clamps upper supporting block under the effect of gravity, positioning sample is in upper grip Position.
3) lower snap ring is first inserted in sample from sample lower end, is temporarily fixed to upper grip, then carefully put sample lower end Enter lower collet interior, protective frame is installed on upper and lower collet, position upper and lower collet.
4) supporting block is fitted into down from sample both sides in collet card slot under, is close to gripping section under sample and is installed, from close to upper folder The lower snap ring that the release of head position is packed into before clamps lower supporting block, positioning sample position in lower collet under the effect of gravity.
5) testing machine crossbeam is suitably reduced, will be packed into through the upper and lower fixture of the fixed entirety of protective frame mounted on testing machine Hanging joint first makes the convex spherical of extension bar be packed into upper hanging joint concave spherical surface, and the lower end of lower extension bar is placed in lower hanging joint lower end, slowly Testing machine crossbeam is increased, lower extension bar lower end is made just to start to contact with lower hanging joint bumps spherical surface.
6) according to test requirements document, whole upper and lower fixture circumferential position is adjusted, makes one surface face observation camera lens of sample.
7) K-type hand nutting is unscrewed, protective frame cross bar semi-ring is opened, removes protective frame 7.Preparation starts to test.
The material that all parts of fixture are selected in addition to sample 4 is high temperature resistance and high strength material, can be high temperature alloy, Can be ceramic material etc., so as to which fixture is caused to meet the hot conditions of experiment.
The beneficial effects of the present invention are：
Extension bar is connect by flexural pivot with testing machine, can realize the extension test automatic centering of fixture up and down in the process.Examination Sample thickness direction extension supporting block can effectively prevent thin plate sample buckling in sample circular arc end face stand under load, ensure that clamping is steady It is fixed.Meanwhile snap ring can realize the effect of automatic clamping sample under the effect of gravity, and as temperature increases, sample and support Block volume expansion, snap ring can autobalance clamping forces.Collet is connect by screw thread with extension bar, very convenient can be obtained according to different examinations Control gauge lattice replace collet.In addition, protective frame provisional installation before the test, fine can must protect thin plate sample not in clamping mistake It is damaged in journey.
Description of the drawings
Fig. 1 is fixture assembling schematic diagram.
Fig. 2 is protective frame cross bar schematic diagram.
Fig. 3 is protective frame three dimensional structure diagram.
Fig. 4 and Fig. 5 is chuck structure schematic diagram.
Fig. 6 is hanging joint structure diagram.
Fig. 7 is connection rod structure schematic diagram.
Fig. 8 is upper support block structure schematic diagram.
Fig. 9 is lower support block structure schematic diagram.
Figure 10,11,12 are upper Snap ring structure schematic diagrames.
Figure 13,14,15 are upper Snap ring structure schematic diagrames.
Figure 16 is sample structure schematic diagram.
Figure label is described as follows：
Collet 1；Upper supporting block 2；Upper snap ring 3；Sample 4；Lower supporting block 5；Lower snap ring 6；
Protective frame 7；Extension bar 8；Hanging joint 9；Protective frame positioning surface 10；Protective frame positioning surface top 10a；
Protective frame positioning surface lower part 10b；Collet positions plane 11；Upper supporting block top 12；
Upper supporting block lower part 13；Lower supporting block top 14；Lower supporting block lower part 15；Collet interior 16；
Upper snap ring inner wall 17；Lower snap ring inner wall 18；Concave spherical surface 19；Cooling water nozzle 20；Convex spherical 21；
External screw thread 22；Spanner operation planar 23；Extension bar extension 24；Internal thread hole 25；External cylindrical surface 26；
Upper snap ring hollow cylindrical part 27；Lower snap ring hollow cylindrical part 28；Connecting rod 29；Cross bar 30；
K-type hand nutting 31；Semi-ring 32；Gripping section 33；Changeover portion 34；Intermediate gauge length section 35；
Specific embodiment
A concrete case is described in further detail the present invention in below in conjunction with the accompanying drawings：
As shown in Figure 1：A kind of fixture for the test of composite material flat plate drawing by high temperature including hanging joint 9, extension bar 8, is prevented Retaining frame 7, upper snap ring 3, lower snap ring 6, upper supporting block 2, lower supporting block 5, collet 1 and sample 4 etc..Hanging joint 9 is fixed on testing machine On, extension bar 8 forms flexural pivot by concave, convex spherical surface 19,21 with hanging joint 9 and is connected, and collet 1 is by collet internal thread hole 25 with connecing The external screw thread 22 of bar 8 screws connection, and the surface that upper supporting block 2 and lower supporting block 5 are bonded sample 4 respectively is placed on inside collet 1, and Clamping is distinguished by upper and lower snap ring 3 and 6, protective frame 7 before the test, is mounted on when sample is not loaded on collet 1, on-test Before remove.
In composite material high temperature tension test, specimen shape is as shown in figure 16.Specimen shape is dumbbell shaped, including two Gripping section 33, changeover portion 34 and intermediate gauge length section 35.Changeover portion is arc-shaped.For composite sample, its usual thickness should Extension test of the sample thickness in the ultra-thin samples of 1mm to 3mm can be carried out not less than 3mm, but using this chucking appliance system.Gauge length section is cut Area is unsuitable too small, suggests that gauge length section width is not less than 10mm according to the required precision of correlation test machine.Gripping section width is bigger, circle Segmental arc loaded area is bigger, more can effectively improve local compression situation, but limited by high temperature furnace chamber size, it is proposed that gripping section is wide Degree is between 20-25mm.When arc section radius is too small, the danger zone of sample is smaller, and position is concentrated, and is easily broken at interface It splits, when the ratio of arc radius and gauge length section width is not less than 2.5, the size of danger zone gradually tends towards stability, that is, obtains It is expected that the probability of failure mode greatly increases.When gauge length section length-width ratio is not less than 3, gauge length section can obtain uniform stress point Cloth.When the length of gripping section is not less than 2 with gauge length section width ratio, the influence that clamping segment length corresponds to power concentration tends towards stability. Therefore, it is recommended that the ratio of arc radius and gauge length section width is more than or equal to 2.5, gauge length section length-width ratio and segment length and gauge length are clamped The ratio of Duan Kuandu is more than or equal to 2.0.
The lower supporting block 5 in upper supporting block 2 and Fig. 9 in Fig. 8 has two pieces, two one group, respectively with before and after sample 4 Surface fits, and left and right circular arc end face is flushed with sample.Upper supporting block lower part 13 and lower supporting block top 14, arc surface Size is determined by the changeover portion 34 of sample；Upper supporting block top 12 and lower supporting block lower part 15, the length and width difference of projected square part Long roomy 1mm on 33 surface of gripping section than sample 4 or so；The inclined-plane of the reinforcement of upper and lower supporting block 2 and 5 and itself and sample The angle of binding face is between 3-6 °.
Fig. 4 and Fig. 5 is the structure diagram of collet 1, collet interior 16 and upper supporting block 2 and the section shape of lower supporting block 5 Shape fits, and the size in section can be determined by upper and lower supporting block 2 and 5；22 phase of external screw thread of collet internal thread hole 25 and extension bar 8 Matching；Collet 1 positions plane 11 in the external cylindrical surface setting collet far from gripping section, and collet positions plane 11 apart from original cylinder The outer surface 1mm in face or so.
Upper snap ring 3 in Figure 10, Figure 11 and Figure 12, the lower snap ring 6 with Figure 13, Figure 14, Figure 15, upper and lower snap ring inner wall 17, 18 are fixed supporting block lower part 13 and lower supporting block lower part 15 respectively, upper and lower snap ring top hollow cylindrical part 27,28 with External cylindrical surface 26 is bonded below collet, and upper snap ring hollow cylindrical part 27 is different from the height of lower snap ring hollow cylindrical part 28, Convenient for distinguishing upper and lower snap ring in assembling.
Fig. 7 is the structure diagram of extension bar 8, and extension bar one end external screw thread 22 is screwed with collet internal thread hole 25 to be connect, and A pair of of spanner operation planar 23 is equipped with close to the externally threaded position, the length of extension bar extension 24 is determined by high temperature furnace size, To ensure extension bar other end convex spherical 21 outside high temperature furnace.
Fig. 6 is the structure diagram of hanging joint 9, and cooling water nozzle 20, the concave spherical surface 19 of hanging joint 9 are designed with above hitching position Spherical hinge structure is formed with the convex spherical 21 of extension bar, spherical radius is determined according to fixture design load.Fig. 2 and Fig. 3 is protective frame 7 Structure diagram, by a connecting rod 29, the identical cross bar 30 of two root architectures and K-type hand nutting 31 are formed.On-test Before, it is mounted on collet 1 when sample is not loaded into；By unscrewing K-type hand nutting 31, semi-ring 32 is opened, cross bar 30 can be inserted in Collet 1 then locks K-type hand nutting 31.The protective frame positioning surface top 10a and protective frame positioning surface 10b of two cross bars 30 It is matched with collet positioning plane 11, can realize by protective frame positioning surface top 10a and protective frame positioning surface 10b and press from both sides up and down Head it is circumferentially positioned.
Non-elaborated part of the present invention belongs to techniques well known.
The above, part specific implementation method only of the present invention, but protection scope of the present invention is not limited thereto, and is appointed In the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in should all be covered what those skilled in the art Within protection scope of the present invention.

Claims (10)

1. a kind of composite thin plate drawing by high temperature test fixture having from alignment function, it is characterised in that：The test fixture Including hanging joint, extension bar, protective frame, upper snap ring, lower snap ring, upper supporting block, lower supporting block, collet and sample；
The hanging joint includes upper hanging joint and lower hanging joint, and upper and lower mounting header structure is identical；Upper hanging joint and lower hanging joint are hung The place of connecing is designed with concave spherical surface, and spherical radius is determined according to fixture design load, and cooling water nozzle, hanging joint are designed with above hitching position It is fixed on testing machine；
The extension bar includes upper extension bar and lower extension bar, upper and lower connection rod structure are identical；Extension bar one end is convex spherical, and size is with hanging Radius at connector concave spherical surface is identical, and extension bar forms flexural pivot by concave, convex spherical surface with hanging joint and is connected；The extension bar other end is outer Screw thread, and it is being equipped with a pair of of spanner operation planar close to the externally threaded position；Extension bar extends segment length according to high temperature furnace size It determines, need to ensure convex spherical outside high temperature furnace；
The collet includes upper grip and lower collet, and upper and lower chuck structure is identical, the internal thread hole of collet and the external screw thread of extension bar Screw connection；Collet is split type with extension bar, convenient for carrying out the replacement of collet according to different patterns；Collet is outer far from bare terminal end Cylindrical surface is equipped with a collet in directly to the right and positions plane；
The upper supporting block includes upper supporting block top and upper supporting block lower part, and upper supporting block top is square, in upper supporting block The left and right end face in portion is plane, and the upper left and right end face in supporting block lower part is arc surface；The lower supporting block includes lower supporting block top With lower supporting block lower part, the lower left and right end face in supporting block top is arc surface, and lower supporting block lower part is square, lower supporting block lower part Left and right end face is plane；Upper supporting block and lower supporting block respectively form inverted T-shaped, two one group, are bonded the front surface of sample respectively And rear surface, circular arc end face are flushed with sample；
The upper snap ring and lower snap ring are all inverted U shape, upper and lower snap ring inner wall inner surface from top to bottom according to upper supporting block lower part The bevel angle identical with lower supporting block lower part is gradually thinned；
The protective frame is made of a connecting rod, the identical cross bar of two root architectures and K-type hand nutting；Assembling finishes anti- Retaining frame, the protective frame positioning surface top and protective frame positioning surface lower part of two cross bars are in one plane.
2. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：Under sample loading state, upper supporting block and lower supporting block are placed on the section shape of collet interior, upper supporting block and lower supporting block Shape is bonded to each other with collet interior shape, realizes being mutually located for supporting block and collet；Along sample thickness direction, under upper supporting block Portion's circular arc portion thickeies, and lower supporting block lower part projected square part thickeies, and thickening mode is from top to bottom gradually added by constant inclined surface angle Thickness finally constitutes up-narrow and down-wide wedge shape；Bevel angle is at 3-6 °.
3. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：It is packed under sample state, upper and lower snap ring is fixed supporting block respectively by gravity, upper and lower snap ring inner wall Lower part and lower supporting block lower part；And upper and lower snap ring top hollow cylindrical part mutually agrees with external cylindrical surface below collet, realizes Snap ring and collet are mutually located, then by upper and lower supporting block, realize sample in collet interior positioning in the front-back direction.
4. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：Upper and lower snap ring and gravity Automatic-clamping sample can not only be passed through, additionally it is possible to according to test temperature autobalance clamping force, When the temperature of sample and supporting block increases, the overall thickness of sample and upper and lower supporting block can increase, and upper and lower snap ring can opposite support Block moves up, autobalance thickness direction clamping force.
5. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：Protective frame is mounted on when sample is not loaded on collet before on-test；By unscrewing K-type hand nutting, half is opened Ring, cross bar can be inserted in collet, then lock K-type hand nutting；It is fixed that protective frame positioning surface cooperates with collet positioning plane The circumferentially positioned of upper and lower collet is realized in position by protective frame positioning surface top and protective frame positioning surface lower part.
6. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：Upper and lower collet and to screw connected extension bar with collet integral by the protective frame shape of loading, pacifies in this case Sample, upper and lower supporting block and upper and lower snap ring are filled, then integral clamp by the convex spherical of extension bar is packed into and is mounted on experiment Concave spherical surface inside the hanging joint of machine increases testing machine crossbeam, when bumps flexural pivot face just starts contact up and down, unscrews K-type hand and twists Nut opens semi-ring, removes protective frame；Protective frame is mounted on before on-test on fixture, is protected sample, is entirely pacified in fixture After the completion of dress, fixture overall movement is installed on testing machine by protective frame, during on-test, then is dismantled, Neng Goubao Demonstrate,prove the accuracy of installation.
7. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：During experiment, to cause displacement and the loading of power even if there are deviations the orientation of hanging joint up and down and angle of testing machine Not on a vertical line, the presence in extension bar flexural pivot face can also realize that collet is during the experiment from centering up and down, it is ensured that experiment As a result accuracy.
8. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：Specimen shape is dumbbell shaped, including two gripping sections, two changeover portions and intermediate gauge length section；Changeover portion or so end face is It is arc-shaped.
9. the composite thin plate drawing by high temperature test fixture according to claim 1 having from alignment function, feature It is：The material that all parts of fixture are selected in addition to sample is high temperature resistant, high-strength material, including high temperature alloy, ceramic material Material.
10. a kind of composite thin plate drawing by high temperature test fixture according to claim 1 with from alignment function Installation method, which is characterized in that include the following steps：
Step 1：By in one of loading upper grip card slot of two upper supporting blocks, the gripping section of sample is close to supporting block Installation, then another loading of two upper supporting blocks is compressed into sample holder section；
Step 2：Upper snap ring is inserted in from upper grip upper end, clamps upper supporting block under the effect of gravity, positioning sample is in upper grip Position；
Step 3：Lower snap ring is first inserted in sample from sample lower end, is temporarily fixed to upper grip, is then put into down sample lower end Protective frame is installed on upper and lower collet by collet interior, positions upper and lower collet；
Step 4：Lower supporting block is fitted into down from sample both sides in collet card slot, is close to gripping section under sample and is installed, from close to upper folder The lower snap ring that the release of head position is packed into before clamps lower supporting block, positioning sample position in lower collet under the effect of gravity；
Step 5：Testing machine crossbeam is reduced, the mounting mounted on testing machine will be packed into through the upper and lower fixture of the fixed entirety of protective frame Head first makes the convex spherical of extension bar be packed into upper hanging joint concave spherical surface, and the lower hanging joint lower end of lower end merging of lower extension bar slowly increases Testing machine crossbeam makes lower extension bar lower end just start to contact with lower hanging joint concave, convex spherical surface；
Step 6：The whole upper and lower fixture circumferential position of adjustment makes one surface face observation camera lens of sample；
Step 7：K-type hand nutting is unscrewed, opens protective frame cross bar semi-ring, removes protective frame, preparation starts to test.
CN201810001640.2A 2018-01-02 2018-01-02 Composite material sheet high-temperature tensile test fixture with self-centering function and method Active CN108225899B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109030192A (en) * 2018-07-28 2018-12-18 中国石油天然气集团有限公司 A kind of full-scale wide plate test fixture and installation method of automatic centering
CN110044692A (en) * 2019-05-22 2019-07-23 中国民航大学 A kind of high temperature tension test fixture for fragile material flat test piece

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