CN114216799A - Composite material interlayer fracture toughness test clamp under low-speed impact and use method thereof - Google Patents
Composite material interlayer fracture toughness test clamp under low-speed impact and use method thereof Download PDFInfo
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- CN114216799A CN114216799A CN202111463718.0A CN202111463718A CN114216799A CN 114216799 A CN114216799 A CN 114216799A CN 202111463718 A CN202111463718 A CN 202111463718A CN 114216799 A CN114216799 A CN 114216799A
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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
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses a composite material interlaminar fracture toughness test fixture under low-speed impact and a use method thereof, belonging to the technical field of composite material impact test, wherein the composite material interlaminar fracture toughness test fixture under low-speed impact comprises an upper fixing component; the lower moving assembly comprises a lower clamping piece and is used for fixing the sample together with the upper fixing assembly during testing; the lower moving assembly comprises a transfer component connected with the lower clamping piece, the transfer component is arranged on the lower clamping piece, and the transfer component and the lower clamping piece are arranged on the fixed seat assembly in an adjustable position and used for receiving instantaneous impact of the impact device. The device for carrying out the instantaneous low-speed impact test on the interlaminar fracture toughness of the composite material and the test method are provided according to the I-II mixed type interlaminar fracture toughness standard of the unidirectional fiber reinforced polymer matrix composite material, so that the maximum stripping force of the composite material under the low-speed impact condition can be further obtained.
Description
Technical Field
The invention belongs to the technical field of composite material impact testing, relates to a composite material interlayer fracture toughness testing clamp under low-speed impact and a using method thereof, and particularly relates to a static low-speed impact unidirectional fiber reinforced polymer matrix composite material interlayer fracture toughness clamping device and a using method thereof.
Background
The advanced composite material has the excellent performance characteristics of high specific stiffness, high specific strength, excellent anti-fatigue property and the like, and is widely applied to various industries. Most of the components of the latest military or civil aircraft are made of composite materials, in particular in the field of aerospace. The interlaminar fracture toughness is an index for representing the delamination and expansion resistance of the composite material and is an important input parameter for the delamination and expansion analysis of the composite material. Therefore, a simple and reliable method for testing the interlaminar fracture toughness of the composite material has important significance on the performance characterization and design of the composite material.
Generally, a cantilever beam test is used for testing the interlaminar fracture toughness, in order to acquire the detail process of damage evolution of a test piece in the process of being impacted, the material to be tested is usually slowly stretched and compressed to obtain the maximum stripping force, and in the actual practical scene, the material structures may be subjected to various impact events during production, service and maintenance, such as hail falling off due to sudden weather change, broken stones splashed on a runway, and a dropping maintenance tool. Although such low-speed impact may not cause visual damage to the surface, irreversible damage modes such as matrix cracks or interlayer delamination to a certain extent are caused in the composite material, so that the structural strength and the performance of the composite material are seriously reduced, and a certain degree of potential safety hazard is caused.
However, equipment for carrying out instantaneous low-speed impact on the interlaminar fracture toughness of the composite material is lacked at the present stage, the maximum stripping force of the composite material under the low-speed impact condition is further obtained, and the low-speed impact test under the static condition that the composite material is pressed still has certain practical significance so as to research the damage details of the composite material.
A anchor clamps that is used for double cantilever beam tensile test to test I type interlaminar fracture toughness as CN110361255A proposes, its last fixture and lower fixture that includes the same structure and mirror image distribution, go up fixture and include: one end of the clamped part is clamped on the testing machine, two first lugs are symmetrically arranged at the other end of the clamped part, and each first lug is provided with a first through hole; and one end of the clamping part is provided with a second lug, the second lug is provided with a second through hole, and the other end of the clamping part is connected with one side end part of the test piece through an adhesive. The invention facilitates the clamping and the use of the testing machine, and can ensure that the load application in the stretching process can not deviate and is uniformly distributed. It is still a simple tensile compression test for interlaminar fracture toughness.
Disclosure of Invention
The invention aims to provide a clamp for testing the interlaminar fracture toughness of a composite material under low-speed impact and a using method thereof, so as to solve the problems that equipment for carrying out instantaneous low-speed impact on the interlaminar fracture toughness of the composite material is lacked and the maximum stripping force of the composite material under the condition of low-speed impact is further obtained in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the composite material interlaminar fracture toughness test fixture under low-speed impact and the use method thereof comprise the following steps:
an upper fixing assembly;
the lower moving assembly comprises a lower clamping piece and is used for fixing the sample together with the upper fixing assembly during testing;
the lower moving assembly comprises a transfer component connected with the lower clamping piece, the transfer component is arranged on the lower clamping piece, and the position of the transfer component are adjustable and are arranged on the fixed seat assembly to receive the instantaneous impact of the impact device and transfer the acting force to the sample through the lower clamping piece, so that the lower half part of the sample is further driven to be peeled.
Preferably, the transfer member comprises a carrier block for connecting the lower clamp and transferring the force to the sample.
Preferably, a force transmission shaft is arranged on the bearing block, and the end part of the force transmission shaft is used for receiving the impact of the impact device.
Preferably, the impact device comprises an impact frame, the bottom of the impact frame is matched with the force transmission shaft and provided with a groove for impacting the impact frame, and the top of the impact frame is selectively provided with an impact shaft for connecting a drop hammer testing machine.
Preferably, both sides of the fixed seat assembly are provided with communication grooves for arranging the force transmission shaft, and an end of the force transmission shaft extends out of the communication grooves to receive the impact of the impact device.
Preferably, the lower clamping piece comprises a first lower hinge and a second lower hinge hinged with the first lower hinge, wherein the second lower hinge is fixedly arranged on the bearing block, and the first lower hinge is in contact with the test sample.
Preferably, the upper fixing assembly comprises an upper clamping piece, the upper clamping piece comprises a first upper hinge and a second upper hinge fixedly connected with the first upper hinge, and the second upper hinge is fixedly mounted on the upper connecting assembly.
Preferably, the second upper hinge is connected to the top of the fixing seat assembly through an upper connecting assembly.
Preferably, a force measuring device is arranged between the upper connecting assembly and the fixing seat assembly and used for acquiring the maximum peeling force of the test sample.
The use method of the composite material interlayer fracture toughness test clamp under low-speed impact is characterized in that: the method comprises the following steps:
s1, arranging the device in a drop hammer testing machine, and manually arranging the test sample in the upper fixing component and the lower moving component;
s2, starting a drop hammer testing machine, wherein the part of the impact device under the traction of the drop hammer testing machine freely falls and impacts on a lower moving component;
and S3, the lower moving assembly drives the lower half part of the sample to be peeled, the upper fixing assembly fixes the upper half part of the sample to be kept still, and the maximum peeling force is further measured by the force measuring device.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides equipment for performing an instantaneous low-speed impact test on interlaminar fracture toughness of a composite material, and provides a test method according to a standard of the I-II mixed type interlaminar fracture toughness of a unidirectional fiber reinforced polymer matrix composite material, so that the maximum stripping force of the composite material under the condition of low-speed impact can be further obtained, a sample is manually arranged in an upper fixed assembly and a lower movable assembly, the sample freely falls and impacts on the lower movable assembly through an impact device, the lower movable assembly drives the lower half part of the sample to be stripped, and the maximum stripping force is measured under the condition of instantaneous impact of the composite material.
Because the position of the lower moving assembly is adjustable, the first lower hinge is fixed, such as through the realization of structures such as shaft pin fixation, static indentation tests can also be carried out through changing the pressure borne by the position adjustment sample of the lower moving assembly, further low-speed impact tests under certain static pressure can be realized, the destructive evolution data of the composite material structure is obtained when bearing pressure, the strength destruction analysis is carried out, and the test range is wider.
This device can directly install drop hammer impact tester and test, reduces experimental cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the impact device of the present invention;
FIG. 3 is a schematic view of a mounting base assembly of the present invention;
fig. 4 is a partial structural view of the clamping member of the present invention.
In the figure: 1. an impact device; 11. an impact frame; 12. a groove; 13. an impact shaft; 2. a lower moving assembly; 21. a force transmission shaft; 22. a bearing block; 23. a lower clamping member; 231. a first lower hinge; 232. a second lower hinge; 3. a sample; 4. an upper fixing assembly; 41. an upper clamping member; 411. a first hinge is arranged; 412. a second hinge is arranged; 42. an upper connection assembly; 5. a fixed seat assembly; 6. a force measuring device.
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.
Referring to fig. 1-4, the present invention provides a technical solution: the composite material interlaminar fracture toughness test fixture under low-speed impact and the use method thereof comprise the following steps:
an upper fixing component 4;
the lower moving assembly 2 comprises a lower clamping piece 23 and is used for fixing the sample 3 together with the upper fixing assembly 4 during testing;
the lower moving assembly 2 comprises a transmission component connected with the lower clamping piece 23, the transmission component is arranged on the lower clamping piece 23, the position of the transmission component and the position of the lower clamping piece are arranged on the fixed seat assembly 5 in an adjustable mode, the transmission component is used for receiving the instantaneous impact of the impact device 1 and transmitting the acting force to the sample 3 through the lower clamping piece 23, and the lower half part of the sample 3 is further driven to be peeled.
In this embodiment, the sample 3 is manually disposed in the upper fixing component 4 and the lower moving component 2, wherein the impact shaft 13 in the impact device 1 can be a part directly connected to the drop hammer tester, and then the drop hammer tester is started, the impact device 1 falls freely to impact on the lower moving component 2, i.e. the impact frame 11 impacts the force transmission shaft 21, so as to further transmit the acting force of the instantaneous impact to the sample 3, the lower moving component 2 drives the lower half part of the sample 3 to peel off, while the upper half part of the sample 3 fixed by the upper fixing component 4 remains still, and further the maximum peeling force is measured by the force measuring device 6.
Because the position of the lower moving assembly 2 is adjustable, the lower hinge 231 is fixed, such as through the structure realization of shaft pin fixation, static indentation test can also be carried out through changing the pressure borne by the position adjustment sample 3 of the lower moving assembly 2, further low-speed impact test under certain static pressure can be realized, how evolution data is destroyed when the composite material structure bears pressure is obtained, and strength destruction analysis is carried out.
The test specimen 3 may be bonded to the upper fixed member 4 and the lower movable member 2.
In particular, the transmission member comprises a bearing block 22, the bearing block 22 being adapted to engage the lower clamp 23 and transmit the force to the test specimen 3.
In this embodiment, the bearing block 22 is used for connecting the lower clamping member 23 and transmitting the acting force to the sample, and under the specific use condition, the bearing block 22 has a tendency of moving downwards under the traction of the force transmission shaft 21, and further drives the lower clamping member 23 and the sample 3, so that the sample 3 has a tendency of interlayer fracture.
Specifically, the bearing block 22 is provided with a force transmission shaft 21, and an end of the force transmission shaft 21 is used for receiving the impact of the impact device 1.
In this embodiment, the force transmission shaft 21 is used for receiving the instant impact of the impact device 1, and the force transmission shaft 21 may be penetratingly mounted on the bearing block 22, and the end portion thereof receives the impact of the impact device 1.
Specifically, the impact device 1 comprises an impact frame 11, a groove 12 is arranged at the bottom of the impact frame 11 in a matched manner with a force transmission shaft 21 and used for impacting the impact frame, and an impact shaft 13 is selectively arranged at the top of the impact frame 11 and used for connecting a drop hammer testing machine.
In this embodiment, the bottom of the impact frame 11 is provided with a groove 12 in cooperation with the force transmission shaft 21, so that the force transmission shaft 21 is uniformly stressed, and the impact shaft 13 can be regarded as a connecting component of the drop hammer testing machine and the impact frame 11.
Specifically, the two sides of the fixed seat assembly 5 are provided with communication grooves for arranging the force transmission shaft 21, and the end portions of the force transmission shaft 21 extend out of the communication grooves to receive the impact of the impact device 1.
In this embodiment, the end of the force transmission shaft 21 extends out of the communicating groove to receive the impact of the impact device 1, wherein the bearing block 22 can be disposed on the drop hammer testing machine, and the visual test concrete conditions are fixed connection, movable connection, and connection through an elastic member.
Specifically, the lower clamping member 23 includes a first lower hinge 231 and a second lower hinge 232 hinged thereto, wherein the second lower hinge 232 is fixedly mounted on the bearing block 22, and the first lower hinge 231 contacts the test sample 3.
In this embodiment, the first lower hinge 231 is hinged to the second lower hinge 232, and the first lower hinge 231 can rotate, so that the lower half portion of the sample 3 can be driven to be peeled off.
Specifically, the upper fixing assembly 4 includes an upper clamping member 41, the upper clamping member 41 includes a first upper hinge 411 and a second upper hinge 412 fixedly connected thereto, and the second upper hinge 412 is fixedly mounted on the upper connecting assembly 42.
In this embodiment, the first upper hinge 411 and the second upper hinge 412 in the upper clamping member 41 are set to be at a fixed angle, here ninety degrees, and the fixed angle between the two can be adjusted according to the test condition, and further, the instantaneous impact of different angles on the test sample 3 can be adapted by rotating the first lower hinge 231.
Specifically, the second upper hinge 412 is connected to the top of the fixing seat assembly 5 through the upper connecting assembly 42.
In this embodiment, when performing the static low-speed impact test, the second upper hinge 412 is connected to the top of the fixed seat assembly 5 through the upper connecting assembly 42 and remains fixed.
Specifically, a force measuring device 6 is arranged between the upper connecting assembly 42 and the fixing seat assembly 5, so as to obtain the maximum peeling force of the sample 3.
In this embodiment, in which the force measuring device 6 may be a pressure sensor, the reaction force of the sample 3 when impacted is transmitted to the force measuring device 6.
The use method of the composite material interlayer fracture toughness test clamp under low-speed impact is characterized in that: the method comprises the following steps:
s1, arranging the device in a drop hammer testing machine, and manually arranging the sample 3 in the upper fixing component 4 and the lower moving component 2;
s2, starting a drop hammer testing machine, wherein the part of the impact device 1 under the traction of the drop hammer testing machine freely falls and impacts on the lower moving component 2;
s3, the lower moving component 2 drives the lower half part of the sample 3 to be peeled, the upper half part of the sample 3 fixed by the upper fixing component 4 is kept still, and the maximum peeling force is further measured by the force measuring device 6.
The working principle and the using process of the invention are as follows: the sample 3 is manually arranged in the upper fixing component 4 and the lower moving component 2, wherein an impact shaft 13 in the impact device 1 can be a part directly connected with a drop hammer testing machine, then the drop hammer testing machine is started, the impact device 1 freely falls and impacts the lower moving component 2, namely, part of the impact force transmission shaft 21 of the impact frame 11 impacts, the acting force of instantaneous impact is further transmitted to the sample 3 through the impact force transmission shaft, the lower moving component 2 drives the lower half part of the sample 3 to peel, namely, the lower hinge I231 drives the lower half part of the sample 3 to peel, the upper half part of the sample 3 fixed by the upper fixing component 4 keeps still, and the maximum peeling force is further measured through the force measuring device 6.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The composite material interlaminar fracture toughness test fixture under low-speed impact is characterized in that: the method comprises the following steps:
an upper fixing assembly (4);
the lower moving assembly (2) comprises a lower clamping piece (23) and is used for fixing the sample (3) together with the upper fixing assembly (4) during testing;
the lower moving assembly (2) comprises a transmission component connected with the lower clamping piece (23), the transmission component is arranged on the lower clamping piece (23), the position of the transmission component and the position of the lower clamping piece are arranged on the fixed seat assembly (5) in an adjustable mode, the transmission component and the fixed seat assembly are used for receiving instant impact of the impact device (1), acting force is transmitted to the sample (3) through the lower clamping piece (23), and the lower half part of the sample (3) is further driven to be peeled.
2. The composite interlaminar fracture toughness test fixture under low-speed impact of claim 1, characterized in that: the transfer member comprises a carrier block (22), the carrier block (22) being adapted to connect the lower clamp (23) and transfer the force to the test specimen (3).
3. The composite interlaminar fracture toughness test fixture under low-speed impact of claim 2, characterized in that: the bearing block (22) is provided with a force transmission shaft (21), and the end part of the force transmission shaft (21) is used for receiving the impact of the impact device (1).
4. The composite interlaminar fracture toughness test fixture under low-speed impact of claim 1, characterized in that: impact device (1) is including strikeing frame (11), the bottom cooperation of strikeing frame (11) dowel steel (21) are provided with recess (12) for strike it, impact shaft (13) are installed in the top of strikeing frame (11) is selectable, are used for connecting the drop hammer testing machine.
5. The clamp for testing the interlaminar fracture toughness of the composite material under low-speed impact according to claim 4, is characterized in that: two sides of the fixing seat assembly (5) are provided with communication grooves for arranging the force transmission shaft (21), and the end part of the force transmission shaft (21) extends out of the communication grooves to receive the impact of the impact device (1).
6. The composite interlaminar fracture toughness test fixture under low-speed impact of claim 2, characterized in that: the lower clamping piece (23) comprises a first lower hinge (231) and a second lower hinge (232) hinged with the first lower hinge (231), wherein the second lower hinge (232) is fixedly installed on the bearing block (22), and the first lower hinge (231) is in contact with the test sample (3).
7. The composite interlaminar fracture toughness test fixture under low-speed impact of claim 1, characterized in that: the upper fixing assembly (4) comprises an upper clamping piece (41), the upper clamping piece (41) comprises a first upper hinge (411) and a second upper hinge (412) fixedly connected with the first upper hinge (411), and the second upper hinge (412) is fixedly installed on the upper connecting assembly (42).
8. The composite interlaminar fracture toughness test fixture under low-speed impact of claim 7, characterized in that: the second upper hinge (412) is connected to the top of the fixing base assembly (5) through an upper connecting assembly (42).
9. The composite interlaminar fracture toughness test fixture of claim 8, characterized in that: and a force measuring device (6) is arranged between the upper connecting assembly (42) and the fixing seat assembly (5) and is used for acquiring the maximum peeling force of the test sample (3).
10. The use method of the composite interlaminar fracture toughness test fixture under low-speed impact according to any one of claims 1 to 9, characterized by comprising the following steps: the method comprises the following steps:
s1, arranging the device in a drop hammer testing machine, and manually arranging the test sample (3) in the upper fixing component (4) and the lower moving component (2);
s2, starting a drop hammer testing machine, wherein the part of the impact device (1) under the traction of the drop hammer testing machine freely falls and impacts on the lower moving component (2);
s3, the lower moving component (2) drives the lower half part of the test sample (3) to be peeled, the upper fixing component (4) fixes the upper half part of the test sample (3) to be kept still, and the maximum peeling force is further measured through the force measuring device (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111463718.0A CN114216799A (en) | 2021-12-03 | 2021-12-03 | Composite material interlayer fracture toughness test clamp under low-speed impact and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111463718.0A CN114216799A (en) | 2021-12-03 | 2021-12-03 | Composite material interlayer fracture toughness test clamp under low-speed impact and use method thereof |
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| CN114216799A true CN114216799A (en) | 2022-03-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115586083A (en) * | 2022-10-12 | 2023-01-10 | 东南大学 | Method for testing II-type fracture toughness of pultrusion type fiber reinforced composite material |
-
2021
- 2021-12-03 CN CN202111463718.0A patent/CN114216799A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115586083A (en) * | 2022-10-12 | 2023-01-10 | 东南大学 | Method for testing II-type fracture toughness of pultrusion type fiber reinforced composite material |
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Inventor after: Shen Dieou Inventor after: Zhou Song Inventor after: Zhang Qingpeng Inventor before: Zhang Qingpeng |
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Address after: No. 14, phase IV, Chunsun West Road, Xishan District, Wuxi City, Jiangsu Province, 214000 Applicant after: Wuxi Ruilai New Material Technology Co.,Ltd. Address before: No. 14, phase IV, Chunsun West Road, Xishan District, Wuxi City, Jiangsu Province, 214000 Applicant before: Wuxi Ruilai Testing Technology Co.,Ltd. |