CN209784052U - Anti-bending fatigue test fixture - Google Patents
Anti-bending fatigue test fixture Download PDFInfo
- Publication number
- CN209784052U CN209784052U CN201822236036.6U CN201822236036U CN209784052U CN 209784052 U CN209784052 U CN 209784052U CN 201822236036 U CN201822236036 U CN 201822236036U CN 209784052 U CN209784052 U CN 209784052U
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- Prior art keywords
- block
- positioning pin
- hole
- groove
- tightening
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 25
- 238000005452 bending Methods 0.000 title description 2
- 210000000078 claw Anatomy 0.000 claims abstract description 37
- 239000004809 Teflon Substances 0.000 claims description 7
- 229920006362 Teflon® Polymers 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 9
- 238000007906 compression Methods 0.000 abstract description 7
- 230000006835 compression Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a retroflexion fatigue test anchor clamps, including two sets of mutual symmetries and the anchor clamps body that the structure is the same, the anchor clamps body includes supporting block (1), extensometer installation piece (2), goes up claw (3), pretension bolt (4), lower claw (5), under bracing piece (6), locating pin (7), goes up locating piece (8), lower locating piece (9), the utility model discloses can effectively avoid the sample to take place the bucking in compression process, can not influence the measurement that the sample meets an emergency simultaneously, can effectual improvement compression fatigue test quality, improve test data's accuracy.
Description
Technical Field
The utility model relates to a material fatigue test is with inflection device specifically is an inflection fatigue test anchor clamps that can avoid dull and stereotyped sample to take place bucking in compression process.
Background
In a fatigue test of a material, a sample is easy to bend in a compression stage, and the accuracy of test data is affected, so that the sample needs to be supported to prevent buckling. At present, a known anti-buckling clamp for fatigue tests is composed of an I-shaped supporting block and a bolt. The support block is fixed on the surface of the sample by the bolt, and certain preload is applied to keep the sample vertical in the compression process. The retroflexion clamp of this construction does not support the entire surface of the sample and does not provide effective support for thinner samples. Due to the shielding of the supporting block, the strain of the sample is difficult to measure in the testing process, and meanwhile, the friction between the sample and the supporting block in the testing process can also have certain influence on the accuracy of the testing result.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the not enough of current anti-buckling fatigue test device, the utility model provides an anti-buckling fatigue test anchor clamps, this anchor clamps can effectual whole gauge length section that supports the sample, and the installation extensometer that moreover can be convenient is with the meeting an emergency of measurement sample, the effectual influence that reduces frictional force to the test result in the fatigue test process simultaneously.
The technical scheme is as follows: in order to achieve the above object, the utility model adopts the following technical scheme:
a retroflexion fatigue test fixture comprises two sets of fixture bodies which are symmetrical to each other and have the same structure, wherein each fixture body comprises an upper supporting block, an extensometer mounting block, an upper claw, a pre-tightening bolt, a lower claw, a lower supporting block, a positioning pin, an upper positioning block and a lower positioning block, the upper end of the upper supporting block is provided with a first round hole, the lower end of the upper supporting block is provided with a first U-shaped groove, the upper end of the lower supporting block is provided with a second U-shaped groove, and the lower end of the lower supporting block is provided with a second round; the upper positioning block is provided with a first groove, and two sides of the first groove are provided with third round holes; the lower positioning block is provided with a second groove, and two sides of the second groove are provided with a fourth round hole; the positioning device comprises a groove I, a groove II, a positioning pin I, a positioning pin II and a positioning pin II, wherein the positioning pin I is arranged on a circular hole III on two sides of the groove I; the second positioning pin is arranged on a fourth round hole on two sides of the second groove, the second round hole and the first U-shaped groove are arranged in the second groove, the second round hole and the first U-shaped groove are alternately arranged, and the second positioning pin is inserted into the second round hole and the first U-shaped groove; the upper claw is fixedly arranged on the upper positioning block, and the lower claw is fixedly arranged on the lower positioning block; the extensometer mounting block is fixed on the lower claw; the upper positioning block is provided with a first pre-tightening through hole, the lower positioning block is provided with a second pre-tightening through hole, and the pre-tightening bolts are used for respectively penetrating the first pre-tightening through hole and the second pre-tightening through hole on the two clamps to fix the two clamps.
Preferably: and Teflon coatings are sprayed on the surfaces of the upper supporting block and the lower supporting block.
Preferably: and anti-skid lines are processed on the inner sides of the upper claw and the lower claw.
Preferably: the positioning pin pre-tightening through hole I is formed in the positioning pin I, the pre-tightening bolt penetrates through the positioning pin pre-tightening through hole I to fix the positioning pin I, the positioning pin pre-tightening through hole II is formed in the positioning pin II, and the pre-tightening bolt penetrates through the positioning pin pre-tightening through hole II to fix the positioning pin II.
Preferably: the upper hook claw is sleeved on the upper positioning block.
Preferably: the extensometer mounting block is semi-cylindrical.
Preferably: the lower side of the extensometer mounting block is provided with a dovetail groove, the lower claw is provided with a dovetail, and the extensometer mounting block is fixed on the lower claw through the matching of the dovetail groove and the dovetail.
Compared with the prior art, the utility model, following beneficial effect has:
Buckling of the sample can be effectively avoided in the compression stage of the material fatigue test, the strain measurement of the sample cannot be influenced, and the influence of friction on a test result can be obviously reduced due to the adoption of the Teflon coating.
Drawings
FIG. 1 is a schematic view of a clip for a reverse flex fatigue test.
Fig. 2 is a construction drawing of the clip for the anti-buckling fatigue test.
Fig. 3 is an assembly schematic of the clip for the retroflexion fatigue test.
In the figure, 1, an upper supporting block, 11, a first circular hole, 12, a first U-shaped groove, 1, an upper supporting block, 2, an extensometer mounting block, 3, an upper claw, 4, a pre-tightening bolt, 5, a lower claw, 6, a lower supporting block, 61, a second circular hole, 62, a second U-shaped groove, 7, a positioning pin, 8, a first positioning block, 81, a groove, 82, a third circular hole, 83, a first pre-tightening through hole, 9, a second positioning block, 91, a second groove, 92, a fourth circular hole and 93, a second pre-tightening through hole are included.
Detailed Description
The invention will be further elucidated with reference to the drawings and specific embodiments, it being understood that these examples are intended to illustrate the invention only and are not intended to limit the scope of the invention, and that modifications to the various equivalent forms of the invention, which may occur to those skilled in the art after reading the present invention, fall within the scope of the invention as defined in the claims appended hereto.
A retroflexion fatigue test fixture is shown in figures 1-3 and comprises two sets of fixture bodies which are symmetrical to each other and have the same structure, wherein each fixture body comprises an upper support block 1, an extensometer installation block 2, an upper claw 3, a pre-tightening bolt 4, a lower claw 5, a lower support block 6, a positioning pin 7, an upper positioning block 8 and a lower positioning block 9, the upper end of the upper support block 1 is provided with a first round hole 11, the lower end of the upper support block is provided with a first U-shaped groove 12, the upper end of the lower support block 6 is provided with a second U-shaped groove 62, and the lower end of the lower support block is provided with a second round; the upper positioning block 8 is provided with a first groove 81, and two sides of the first groove 81 are provided with third round holes 82; the lower positioning block 9 is provided with a second groove 91, and two sides of the second groove 91 are provided with a fourth round hole 92; the number of the positioning pins 7 is two, namely a first positioning pin and a second positioning pin, the first positioning pin is arranged on a third circular hole 82 on two sides of a first groove 81, a first circular hole 11 and a second U-shaped groove 62 are arranged in the first groove 81, the first circular hole 11 and the second U-shaped groove 62 are alternately arranged, and the first positioning pin is inserted into the first circular hole 11 and the second U-shaped groove 62; the second positioning pin is arranged on a fourth round hole 92 on two sides of the second groove 91, the second round hole 61 and the first U-shaped groove 12 are arranged in the second groove 91, the second round hole 61 and the first U-shaped groove 12 are alternately arranged, and the second positioning pin is inserted into the second round hole 61 and the first U-shaped groove 12; the upper claw 3 is fixedly arranged on the upper positioning block 8, and the lower claw 5 is fixedly arranged on the lower positioning block 9; the extensometer mounting block 2 is fixed on the lower claw 5; the upper positioning block 8 is provided with a first pre-tightening through hole 83, the lower positioning block 9 is provided with a second pre-tightening through hole 93, and the pre-tightening bolts 4 are used for respectively penetrating the first pre-tightening through hole 83 and the second pre-tightening through hole 93 on the two clamps to fix the two clamps. In the assembling process, the positioning pin 7 penetrates through the positioning block 8 and the upper support block 1 and the lower support block 6 to connect the upper support block 1 and the lower support block 6 with the positioning block 8. The upper supporting block 1 and the lower supporting block 6 are mutually inserted, and are inserted into the positioning pins 7 of the opposite side through the U-shaped grooves at the end parts, and the upper supporting block 1 and the lower supporting block 6 can mutually slide to change the length of the clamp. In the experimental process, the upper claw 3 and the lower claw 5 are sleeved into the positioning block 8 and move up and down together with the positioning block 8 to adjust the length of the clamp so as to ensure that the length of the clamp is consistent with the length of the sample.
In order to reduce the influence of friction force on a test result, Teflon coatings are sprayed on the surfaces of the upper supporting block 1 and the lower supporting block 6, and the friction force between the upper supporting block 1 and the lower supporting block 6 and a sample in the experimental process can be effectively reduced due to the extremely small sliding friction coefficient of Teflon; and anti-skid lines are processed on the inner sides of the upper claw 3 and the lower claw 5. The positioning pin I is provided with a positioning pin pre-tightening through hole I, the pre-tightening bolt 4 penetrates through the positioning pin pre-tightening through hole I to fix the positioning pin I, the positioning pin II is provided with a positioning pin pre-tightening through hole II, and the pre-tightening bolt 4 penetrates through the positioning pin pre-tightening through hole II to fix the positioning pin II.
The upper claw 3 is sleeved on the upper positioning block 8, and the lower claw 5 is sleeved on the lower positioning block 9 and drives the positioning block to move along with the chuck of the tester.
The extensometer mounting block 2 is semi-cylindrical in shape. For the installation extensometer with the strain of measuring the sample, set up extensometer installation piece 2, extensometer installation piece 2's downside is equipped with the dovetail, be provided with the forked tail on the knuckle 5 down, will extensometer installation piece 2 fix on knuckle 5 down through the cooperation of dovetail and forked tail, installation that can be convenient provides the space for the installation of extensometer on knuckle 5 down.
during the use, put the sample between two anchor clamps bodies, pretension bolt 4 passes pretension through-hole one 83 on two anchor clamps bodies respectively, locating pin pretension through-hole one is fixed two upper locating pieces 8, passes pretension through-hole two 93 on two anchor clamps bodies, and locating pin pretension through-hole two is fixed two lower locating pieces 9, and then fixes the sample through two anchor clamps bodies, applys certain preload through pretension bolt 4 simultaneously, makes the sample can obtain effectual support in compression process, avoids taking place the bucking.
The utility model discloses a bolt, locating pin and locating piece are fixed in the sample surface with ten supporting shoes of two sets of totally, can slide in order to change anchor clamps length each other between the adjacent supporting shoe. In the fatigue test process, the hook claws at the two ends of the clamp move up and down along with the chuck of the testing machine and continuously adjust the length of the clamp so as to adapt to the length change of the sample, thereby achieving the purpose of supporting the whole sample. In order to measure the strain of the sample, a dovetail is processed on one side of the hook claw, and a semi-cylindrical extensometer mounting block can be mounted to fix the extensometer, so that the purpose of measuring the strain of the sample from the side surface is achieved. The Teflon coating is sprayed on the surface of the supporting block, and because the friction coefficient of Teflon is low, the friction between the supporting block and a sample and between the supporting blocks can be effectively reduced, and the accuracy of a test result is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (7)
1. The utility model provides a retroflexion fatigue test anchor clamps which characterized in that: the clamp comprises two groups of clamp bodies which are symmetrical to each other and have the same structure, wherein each clamp body comprises an upper supporting block (1), an extensometer mounting block (2), an upper claw hook (3), a pre-tightening bolt (4), a lower claw hook (5), a lower supporting block (6), a positioning pin (7), an upper positioning block (8) and a lower positioning block (9), a first round hole (11) is formed in the upper end of the upper supporting block (1), a first U-shaped groove (12) is formed in the lower end of the upper supporting block, a second U-shaped groove (62) is formed in the upper end of the lower supporting block (6), and a second round hole (61); the upper positioning block (8) is provided with a first groove (81), and two sides of the first groove (81) are provided with third round holes (82); the lower positioning block (9) is provided with a second groove (91), and two sides of the second groove (91) are provided with a fourth round hole (92); the positioning pins (7) are two, namely a first positioning pin and a second positioning pin, the first positioning pin is arranged on a third circular hole (82) on two sides of a first groove (81), the first circular hole (11) and a second U-shaped groove (62) are arranged in the first groove (81), the first circular hole (11) and the second U-shaped groove (62) are alternately arranged, and the first positioning pin is inserted into the first circular hole (11) and the second U-shaped groove (62); the second positioning pin is arranged on a fourth round hole (92) on two sides of the second groove (91), the second round hole (61) and the first U-shaped groove (12) are arranged in the second groove (91), the second round hole (61) and the first U-shaped groove (12) are alternately arranged, and the second positioning pin is inserted into the second round hole (61) and the first U-shaped groove (12); the upper claw (3) is fixedly arranged on the upper positioning block (8), and the lower claw (5) is fixedly arranged on the lower positioning block (9); the extensometer mounting block (2) is fixed on the lower claw (5); the upper positioning block (8) is provided with a first pre-tightening through hole (83), the lower positioning block (9) is provided with a second pre-tightening through hole (93), and the pre-tightening bolt (4) is used for respectively penetrating the first pre-tightening through hole (83) and the second pre-tightening through hole (93) on the two clamps to fix the two clamps.
2. The anti-buckling fatigue test fixture of claim 1, wherein: and Teflon coatings are sprayed on the surfaces of the upper support block (1) and the lower support block (6).
3. The anti-buckling fatigue test fixture of claim 1, wherein: and anti-skid lines are processed on the inner sides of the upper claw (3) and the lower claw (5).
4. The anti-buckling fatigue test fixture of claim 1, wherein: the positioning pin pre-tightening structure is characterized in that a first positioning pin pre-tightening through hole is formed in the first positioning pin, the pre-tightening bolt (4) penetrates through the first positioning pin pre-tightening through hole to fix the first positioning pin, a second positioning pin pre-tightening through hole is formed in the second positioning pin, and the pre-tightening bolt (4) penetrates through the second positioning pin pre-tightening through hole to fix the second positioning pin.
5. The anti-buckling fatigue test fixture of claim 1, wherein: the upper claw (3) is sleeved on the upper positioning block (8).
6. The anti-buckling fatigue test fixture of claim 1, wherein: the extensometer mounting block (2) is semi-cylindrical.
7. The anti-buckling fatigue test fixture of claim 1, wherein: the lower side of the extensometer mounting block (2) is provided with a dovetail groove, the lower claw (5) is provided with a dovetail, and the extensometer mounting block (2) is fixed on the lower claw (5) through the matching of the dovetail groove and the dovetail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822236036.6U CN209784052U (en) | 2018-12-28 | 2018-12-28 | Anti-bending fatigue test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822236036.6U CN209784052U (en) | 2018-12-28 | 2018-12-28 | Anti-bending fatigue test fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209784052U true CN209784052U (en) | 2019-12-13 |
Family
ID=68791500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822236036.6U Expired - Fee Related CN209784052U (en) | 2018-12-28 | 2018-12-28 | Anti-bending fatigue test fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209784052U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111380948A (en) * | 2020-03-30 | 2020-07-07 | 北京工业大学 | Calibration method for relationship between magnetic Barkhausen noise and continuous tension and compression stress |
| CN112557176A (en) * | 2020-12-26 | 2021-03-26 | 哈尔滨工业大学 | Buckling-restrained device suitable for plate-shaped composite material tension-compression fatigue damage evolution test |
| CN112557182A (en) * | 2020-12-07 | 2021-03-26 | 上海若顺检测技术有限公司 | Anti-destabilization clamp for composite material open pore tensile compression fatigue test |
| CN113125246A (en) * | 2020-01-15 | 2021-07-16 | 中国商用飞机有限责任公司 | Fatigue test fixture |
-
2018
- 2018-12-28 CN CN201822236036.6U patent/CN209784052U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125246A (en) * | 2020-01-15 | 2021-07-16 | 中国商用飞机有限责任公司 | Fatigue test fixture |
| CN111380948A (en) * | 2020-03-30 | 2020-07-07 | 北京工业大学 | Calibration method for relationship between magnetic Barkhausen noise and continuous tension and compression stress |
| CN112557182A (en) * | 2020-12-07 | 2021-03-26 | 上海若顺检测技术有限公司 | Anti-destabilization clamp for composite material open pore tensile compression fatigue test |
| CN112557176A (en) * | 2020-12-26 | 2021-03-26 | 哈尔滨工业大学 | Buckling-restrained device suitable for plate-shaped composite material tension-compression fatigue damage evolution test |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191213 Termination date: 20201228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |