CN111257106B - High-speed impact test fixture for composite material laminate - Google Patents
High-speed impact test fixture for composite material laminate Download PDFInfo
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- CN111257106B CN111257106B CN202010084332.8A CN202010084332A CN111257106B CN 111257106 B CN111257106 B CN 111257106B CN 202010084332 A CN202010084332 A CN 202010084332A CN 111257106 B CN111257106 B CN 111257106B
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- 239000002131 composite material Substances 0.000 title claims abstract description 51
- 238000009863 impact test Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 49
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims 4
- 238000007906 compression Methods 0.000 claims 4
- 238000012360 testing method Methods 0.000 abstract description 11
- 230000009471 action Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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Abstract
The invention discloses a high-speed impact test fixture for a composite material laminate, which relates to the technical field of high-speed impact test of composite material laminates.A chassis rotating mechanism comprises a mounting plate, a rotating cylindrical disc, two upright posts and a plurality of locking and adjusting components, a loading mechanism comprises a first bracket, a first pressure plate, a loading and adjusting component and two first locking parts, the first bracket is connected with the two upright posts through the first locking parts, the loading and adjusting component is arranged on the first bracket, and the first pressure plate is fixed at the lower end of the loading and adjusting component; the pressing mechanism comprises a second support, a second pressing plate, a pressing adjusting assembly and two second locking pieces, the second support is connected with the two stand columns through the second locking pieces, the loading mechanism is arranged above the pressing mechanisms, the pressing adjusting assembly is installed on one side of the second support, and the second pressing plate is fixed on one side of the pressing adjusting assembly. The impact angle can be flexibly adjusted by the clamp, the clamp is suitable for samples with different aspect ratios, the testing efficiency is improved, and the testing cost is saved.
Description
Technical Field
The invention relates to the technical field of high-speed impact testing of composite material laminates, in particular to a high-speed impact testing clamp for a composite material laminate.
Background
The fiber metal laminate is a hybrid laminated composite material made of a metal sheet and a fiber-reinforced polymer material, and is a composite material laminate in a broad sense. The composite material has high specific stiffness, specific strength, damage tolerance and excellent fatigue resistance, and is widely applied in the fields of aviation, automobile industry and the like. The aircraft is easily impacted by foreign objects such as birds and stones during taking off and landing, and great threat is caused to aviation safety, so that more and more attention is paid to the research on the high-speed impact resistance of the composite material laminate.
However, up to now there is no relevant standard for composite laminate high speed impact test fixture design. The high-speed impact test is basically carried out under the condition that the composite material laminate is vertically impacted on the front surface, and the actual condition is that the flying birds, stones and other foreign objects can impact aircrafts such as airplanes and the like from different angles. Even in a few published documents for researching the influence of the impact angle on the high-speed impact resistance of the composite material laminate, the clamp cannot flexibly adjust the impact angle, and is low in test efficiency and high in cost. In order to adjust the impact angle more flexibly, reduce the cost caused by frequent replacement of the clamp and improve the efficiency of high-speed impact testing, a high-speed impact testing clamp capable of adjusting the impact angle flexibly needs to be designed.
The aspect ratio of the existing high-speed impact test cannot be flexibly adjusted by using the clamp, one clamp can only be suitable for the situation of a composite material laminate with one size, the efficiency of the high-speed impact test is severely limited by frequently replacing the clamp when the high-speed impact resistance of the composite material laminates with different aspect ratios is researched, and the research cost is increased. Therefore, it is desirable to design a high-speed impact test fixture that can flexibly change the aspect ratio.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-speed impact test fixture for a composite material laminate, which can flexibly adjust an impact angle, is suitable for samples with different aspect ratios, improves the test efficiency and saves the test cost.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a high-speed impact test fixture for a composite material laminate, which comprises a chassis rotating mechanism, a loading mechanism and a plurality of pressing mechanisms, wherein the chassis rotating mechanism comprises a mounting plate, a rotating cylindrical disc, two stand columns and a plurality of locking and adjusting components; the loading mechanism comprises a first support, a first pressure plate, a loading adjusting assembly and two first locking members, two ends of the first support are respectively connected with the two upright posts through the first locking members, the loading adjusting assembly is installed on the first support, the first pressure plate is fixed at the lower end of the loading adjusting assembly, and the loading adjusting assembly is used for adjusting the position of the first pressure plate in the vertical direction; hold-down mechanism includes second support, second clamp plate, compresses tightly adjusting part and two second retaining members, the both ends of second support are respectively through one the second retaining member is connected with two the stand, loading mechanism sets up in a plurality of the hold-down mechanism top, compress tightly adjusting part install in second support one side, the second clamp plate is fixed in compress tightly adjusting part one side, it is used for adjusting to compress tightly adjusting part the position of second clamp plate on the horizontal direction.
Preferably, the rotating cylinder dish is provided with a plurality of arc holes along circumference, locking adjusting part with arc hole one-to-one, locking adjusting part includes locking adjusting bolt and locking adjusting nut, one locking adjusting bolt passes in proper order the mounting panel and one the arc hole extends rotating cylinder dish upper portion, locking adjusting bolt installs on upper portion locking adjusting nut.
Preferably, the chassis rotating mechanism further comprises two rib plates, and two ends of each rib plate are respectively and fixedly connected with the lower part of one upright post and the rotating cylindrical disc.
Preferably, the upright post is a T-shaped post.
Preferably, the first bracket comprises a first main plate and two first connecting plates respectively fixed on two sides of the first main plate, one of the first connecting plates is slidably sleeved on the upper portion of the upright post, the other of the first connecting plates can be fixedly locked on the upright post through a first locking member, and the loading adjusting assembly is installed on the first main plate from top to bottom.
Preferably, the loading adjusting assembly comprises a plurality of loading bolts, a plurality of the loading bolts are installed on the first main plate from top to bottom, the first pressing plate is fixed at the lower ends of the loading bolts, and the first locking piece is a first locking bolt.
Preferably, the second support includes the second mainboard and is fixed in respectively two second connecting plates of second mainboard both sides, one second connecting plate sliding sleeve locates one on the stand, one the second connecting plate can be through a second retaining member fixed locking in one on the stand, compress tightly adjusting part install in second mainboard one side.
Preferably, the pressing adjusting assembly comprises a plurality of pressing bolts, the pressing bolts are mounted on one side of the second main plate, the second pressing plate is fixed on one side of the pressing bolts, and the second locking piece is a second locking bolt.
Compared with the prior art, the invention has the following technical effects:
the invention provides a high-speed impact test fixture for a composite material laminate, which comprises a chassis rotating mechanism, a loading mechanism and a plurality of pressing mechanisms, wherein a rotating cylindrical disc in the chassis rotating mechanism can flexibly rotate to a preset impact angle, then is fixed on an installation plate through a locking and adjusting assembly, and an upright post fixed on the rotating cylindrical disc can synchronously rotate by a corresponding angle; the composite material laminate is placed on one side of the two upright posts, the loading mechanism and the pressing mechanism can move up and down relative to the upright posts and are fixed at preset positions through the first locking piece and the second locking piece on the side portions respectively, and then the first pressing plate and the second pressing plates are respectively pushed to act on the composite material laminate by adjusting the loading adjusting assembly and the pressing adjusting assemblies, so that the purposes of stably clamping the composite material laminate and applying pre-pressure on the boundary are achieved. The fixture can be used for high-speed impact testing of composite material laminates with different impact angles and different aspect ratios, different fixtures are not needed to be designed for the composite material laminates with different impact angles and different aspect ratios, the structural applicability is high, the action is reliable, the testing efficiency is improved, and the testing cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a composite laminate high-speed impact test fixture provided by the present invention;
FIG. 2 is a schematic structural view of a chassis rotating mechanism according to the present invention;
FIG. 3 is a schematic structural view of a loading mechanism according to the present invention;
fig. 4 is a schematic structural view of the pressing mechanism of the present invention.
Description of reference numerals: 1. mounting a plate; 2. rotating the cylindrical disc; 3. an arc-shaped hole; 4. locking an adjusting bolt; 5. locking an adjusting nut; 6. a column; 7. a composite laminate; 8. a first bracket; 81. a first main board; 82. a first connecting plate; 83. a T-shaped through hole; 9. a first locking bolt; 10. loading a bolt; 11. a first platen; 12. a second bracket; 121. a second main board; 122. a second connecting plate; 123. a T-shaped groove; 13. a second locking bolt; 14. a hold-down bolt; 15. a second platen; 16. a rib plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a high-speed impact test fixture for a composite material laminate, which can flexibly adjust an impact angle, is suitable for samples with different aspect ratios, improves the test efficiency and saves the test cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-4, the embodiment provides a composite laminate high-speed impact test fixture, which includes a chassis rotating mechanism, a loading mechanism, and a plurality of pressing mechanisms, where the chassis rotating mechanism includes a mounting plate 1, a rotating cylindrical disk 2, two columns 6, and a plurality of locking adjustment assemblies, the rotating cylindrical disk 2 is mounted on the mounting plate 1 through the plurality of locking adjustment assemblies, the two columns 6 are symmetrically fixed on the upper portion of the rotating cylindrical disk 2, and specifically, the columns 6 and the rotating cylindrical disk 2 are an integrated structure; the loading mechanism comprises a first support 8, a first pressing plate 11, a loading adjusting assembly and two first locking members, two ends of the first support 8 are respectively connected with the two upright posts 6 through the first locking members, the first support 8 can move up and down relative to the two upright posts 6 and is locked through the first locking members after being adjusted to a proper position, the loading adjusting assembly is installed on the first support 8, the first pressing plate 11 is fixed at the lower end of the loading adjusting assembly, and the loading adjusting assembly is used for adjusting the position of the first pressing plate 11 in the vertical direction; hold-down mechanism includes second support 12, second clamp plate 15, compress tightly adjusting part and two second retaining members, the both ends of second support 12 are connected with two stands 6 through a second retaining member respectively, second support 12 can be for two stands 6 up-and-down motion, adjust to and lock through the second retaining member after the suitable position, loading mechanism sets up in a plurality of hold-down mechanism tops, compress tightly adjusting part and install in second support 12 one side, second clamp plate 15 is fixed in and compresses tightly adjusting part one side, it is used for adjusting the position of second clamp plate 15 on the horizontal direction to compress tightly adjusting part. In this embodiment, two hold-down mechanisms are provided.
The rotary cylindrical disc 2 in the chassis rotating mechanism can flexibly rotate to a preset impact angle, then is fixed on the mounting plate 1 through the locking adjusting assembly, and the stand column 6 fixed on the rotary cylindrical disc 2 can synchronously rotate by a corresponding angle, so that high-speed impact tests on the composite material laminate 7 at different impact angles are realized. When the composite material laminate pressing mechanism is used, the composite material laminates 7 are placed on one sides of the two upright posts 6, the pressing mechanisms can move up and down relative to the upright posts 6 and are fixed at preset positions through second locking pieces on the side portions, then the second pressing plates 15 are pushed to act on the composite material laminates 7 through the pressing adjusting assemblies, pressing force is applied to the boundaries of the composite material laminates 7, the composite material laminates with different aspect ratios can be fixed at the preset positions, and specifically, the two pressing mechanisms are respectively used for pressing the upper portions and the lower portions of the composite material laminates 7. The loading mechanism can move up and down relative to the upright post 6 and is fixed at a preset position through the first locking piece on the side part, the first pressing plate 11 is pushed to act on the composite material laminated plate 7 by adjusting the loading adjusting assembly, the boundary prepressing force is applied to the boundary of the composite material laminated plate 7, the prepressing force can be applied to the boundary of the composite material laminated plates with different aspect ratios, and therefore the purposes of stably clamping the composite material laminated plate 7 and applying the prepressing force to the boundary can be achieved by adjusting the pressing mechanism and the loading mechanism. The clamp in the embodiment can be used for high-speed impact testing of composite material laminates with different impact angles and different aspect ratios, different clamps are not needed to be designed for the composite material laminates with the different impact angles and the different aspect ratios, the structural applicability is high, the action is reliable, the testing efficiency is improved, and the testing cost is saved.
As shown in fig. 2, the rotating cylindrical disc 2 is provided with a plurality of arc holes 3 along the circumferential direction, the locking adjusting components correspond to the arc holes 3 one to one, specifically, the arc holes 3 and the locking adjusting components are all set to be three, each locking adjusting component comprises a locking adjusting bolt 4 and a locking adjusting nut 5, one locking adjusting bolt 4 sequentially penetrates through the mounting plate 1 and one arc hole 3 to extend to the upper portion of the rotating cylindrical disc 2, and the locking adjusting nuts 5 are installed on the upper portion of the locking adjusting bolts 4. When the impact angle needs to be adjusted, the locking adjusting nuts 5 are loosened, the rotating cylindrical disc 2 can be rotated, and after the preset impact angle is rotated, the locking adjusting nuts 5 are screwed down, so that the rotating cylindrical disc 2 and the mounting plate 1 are relatively fixed, and the whole clamp is fixed firmly.
In order to increase the stability of the whole set of the clamp during high-speed impact, the chassis rotating mechanism further comprises two rib plates 16, two ends of each rib plate 16 are respectively and fixedly connected with the lower part of one upright post 6 and the rotating cylindrical disc 2, and one rib plate 16, one upright post 6 and the rotating cylindrical disc 2 are of a triangular structure. Specifically, the rib 16 is disposed on a side of the upright 6 away from the second pressing plate 15.
In this embodiment, the vertical column 6 is a T-shaped column.
As shown in fig. 3, the first bracket 8 includes a first main plate 81 and two first connecting plates 82 fixed to two sides of the first main plate 81, specifically, the first connecting plates 82 and the first main plate 81 are of an integral structure, one first connecting plate 82 is slidably sleeved on an upper portion of one of the columns 6, one first connecting plate 82 can be fixedly locked on one of the columns 6 by a first locking member, and the loading adjustment assembly is installed on the first main plate 81 from top to bottom. The loading adjusting assembly comprises a plurality of loading bolts 10, the loading bolts 10 are installed on the first main board 81 from top to bottom, the first pressing plate 11 is fixed at the lower ends of the loading bolts 10, the first pressing plate 11 is located below the first main board 81, the position of the first pressing plate 11 in the vertical direction is adjusted by screwing the loading bolts 10, and the first locking piece is the first locking bolt 9.
Specifically, a T-shaped through hole 83 is formed in the first connecting plate 82, the T-shaped through hole 83 is matched with the T-shaped column structure, and the first locking bolt 9 is installed on the outer side of the first connecting plate 82 and can extend into the T-shaped through hole 83.
As shown in fig. 4, the second bracket 12 includes a second main plate 121 and two second connecting plates 122 fixed to two sides of the second main plate 121, specifically, the second connecting plates 122 and the second main plate 121 are of an integral structure, one second connecting plate 122 is slidably sleeved on one upright 6, one second connecting plate 122 can be fixed and locked on one upright 6 through one second locking member, and the pressing adjustment assembly is installed on one side of the second main plate 121. The pressing adjusting assembly comprises a plurality of pressing bolts 14, the plurality of pressing bolts 14 are installed on one side of the second main plate 121, the second pressing plate 15 is fixed on one side of the plurality of pressing bolts 14, the second pressing plate 15 is located between the two second connecting plates 122, the position of the second pressing plate 15 in the horizontal direction is adjusted by screwing the pressing bolts 14, and the second locking piece is a second locking bolt 13.
Specifically, the inner side of the second connecting plate 122 is provided with a T-shaped groove 123, the T-shaped groove 123 is matched with the T-shaped column structure, and the second locking bolt 13 is installed on the outer side of the second connecting plate 122 and can extend into the T-shaped groove 123.
The specific assembly and loading process is as follows: and pressing the composite material laminate 7 tightly and applying pre-pressure on the boundary, specifically, sleeving a second support 12 on the lower part of the upright post 6, screwing second locking bolts 13 at two ends of the second support 12 to fix the second support on the upright post 6, placing the composite material laminate 7 between the two upright posts 6 and a second pressure plate 15, sleeving the other second support 12 on the upper part of the upright post 6 and locating at one side of the composite material laminate 7, screwing the second locking bolts 13 at two ends of the second support 12 to fix the second support on the upright post 6, and rotating the pressing bolts 14 on the two second supports 12 to respectively push the two second pressure plates 15 to press and fix the composite material laminate 7. The first support 8 is sleeved at the upper end of the upright post 6 and slides to a preset position, the first locking bolts 9 at the two ends are screwed down to be fixed on the upright post 6, and the loading bolts 10 are rotated to push the first pressing plate 11 to apply pre-pressure to the boundary of the composite material layer plate 7. And adjusting the impact angle, after the composite material laminate 7 is compressed and pre-pressure is applied to the boundary by the operations, loosening the three locking adjusting nuts 5, rotating the rotary cylindrical disc 2 to drive the whole clamp to a preset impact angle, and then screwing the three locking adjusting nuts 5 to fix the rotary cylindrical disc 2 on the mounting plate 1.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. The high-speed impact test fixture for the composite material laminate is characterized by comprising a chassis rotating mechanism, a loading mechanism and a plurality of pressing mechanisms, wherein the chassis rotating mechanism comprises a mounting plate, a rotating cylindrical disc, two stand columns and a plurality of locking and adjusting assemblies; the loading mechanism comprises a first support, a first pressing plate, a loading adjusting assembly and two first locking members, the first support comprises a first main plate and two first connecting plates fixed on two sides of the first main plate respectively, one first connecting plate is slidably sleeved on the upper part of one upright post, one first connecting plate can be fixedly locked on one upright post through one first locking member, the loading adjusting assembly is installed on the first main plate from top to bottom, the first pressing plate is fixed at the lower end of the loading adjusting assembly, and the loading adjusting assembly is used for adjusting the position of the first pressing plate in the vertical direction; hold-down mechanism includes second support, second clamp plate, compresses tightly adjusting part and two second retaining members, the second support includes the second mainboard and is fixed in respectively two second connecting plates of second mainboard both sides, one second connecting plate sliding sleeve locates one on the stand, one the second connecting plate can pass through one the second retaining member is fixed to be locked in one on the stand, compress tightly adjusting part install in second mainboard one side, loading mechanism sets up in a plurality of hold-down mechanism top, the second clamp plate is fixed in compress tightly adjusting part one side, it is used for adjusting to compress tightly adjusting part the position of second clamp plate on the horizontal direction.
2. The composite material laminate high-speed impact test fixture of claim 1, wherein a plurality of arc-shaped holes are circumferentially formed in the rotary cylindrical plate, the locking adjusting assemblies correspond to the arc-shaped holes one by one, each locking adjusting assembly comprises a locking adjusting bolt and a locking adjusting nut, one locking adjusting bolt sequentially penetrates through the mounting plate and one arc-shaped hole to extend to the upper portion of the rotary cylindrical plate, and the locking adjusting nut is mounted on the upper portion of the locking adjusting bolt.
3. The composite laminate high-speed impact test fixture of claim 1, wherein the chassis rotation mechanism further comprises two ribs, and two ends of each rib are fixedly connected with a lower portion of one of the columns and the rotating cylindrical disk respectively.
4. The composite laminate high-speed impact test fixture of claim 1, wherein the loading adjustment assembly comprises a plurality of loading bolts, the plurality of loading bolts are mounted on the first main plate from top to bottom, the first pressure plate is fixed to lower ends of the plurality of loading bolts, and the first locking member is a first locking bolt.
5. The composite laminate high-speed impact test fixture of claim 1, wherein the compression adjustment assembly comprises a plurality of compression bolts, the plurality of compression bolts are mounted on one side of the second main plate, the second pressure plate is fixed on one side of the plurality of compression bolts, and the second locking member is a second locking bolt.
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| CN202010084332.8A CN111257106B (en) | 2020-02-10 | 2020-02-10 | High-speed impact test fixture for composite material laminate |
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| CN202010084332.8A CN111257106B (en) | 2020-02-10 | 2020-02-10 | High-speed impact test fixture for composite material laminate |
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| CN111257106B true CN111257106B (en) | 2021-04-06 |
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| CN111879603B (en) * | 2020-09-09 | 2021-10-26 | 中南大学 | Air cannon high-speed impact test tool for composite material plate and application method thereof |
| CN113155608A (en) * | 2021-04-13 | 2021-07-23 | 常州启赋安泰复合材料科技有限公司 | Composite material sheet compression loading device |
| CN113654923B (en) * | 2021-06-29 | 2024-04-09 | 湖南科技大学 | Impact test control method for changing temperature and angle |
| CN113702169A (en) * | 2021-09-09 | 2021-11-26 | 南京工业大学 | Universal impact clamp with variable position at any angle |
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