CN111272647A - Prepreg friction testing device and method - Google Patents
Prepreg friction testing device and method Download PDFInfo
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- CN111272647A CN111272647A CN201910809274.8A CN201910809274A CN111272647A CN 111272647 A CN111272647 A CN 111272647A CN 201910809274 A CN201910809274 A CN 201910809274A CN 111272647 A CN111272647 A CN 111272647A
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- clamping assembly
- prepreg
- prepreg layer
- clamping
- fixing plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
Abstract
The invention relates to the technical field of composite material mechanical testing, and discloses a prepreg friction testing device. This prepreg friction test device includes: the clamping assembly comprises a first clamping assembly and a second clamping assembly which are symmetrically arranged, and the transverse distance between the first clamping assembly and the second clamping assembly is adjustable; the material clamping assembly is used for clamping the first prepreg layer, and the material clamping assembly clamped with the first prepreg layer is configured to be clamped between the first clamping assembly and the second clamping assembly and can slide relative to the first clamping assembly and the second clamping assembly. The prepreg friction testing device provided by the invention has the advantages that the prepreg is clamped by the material clamping component, the fixing effect is reliable, the phenomenon that the prepreg is pulled off is avoided, the material clamping component is clamped in the middle through the first clamping component and the second clamping component which are symmetrically arranged, the stability of the whole device is ensured, and more accurate testing data can be obtained.
Description
Technical Field
The invention relates to the technical field of composite material mechanical testing, in particular to a prepreg friction testing device and method.
Background
Prepreg is a composition of a resin matrix and a reinforcement made by impregnating continuous fibers or fabrics with the resin matrix under strictly controlled conditions, and is an intermediate material for making composite materials.
The friction slip characteristics of prepregs are an important physical property that determines the properties of the composite materials made from the prepregs. The existing prepreg friction test device generally adopts the following method: the prepreg is coated on the fixing piece, the prepreg is clamped on the fixing piece through the U-shaped clamping device, then the weights are arranged on the upper side and the lower side of the fixing piece, the surfaces, in contact with the prepreg, of the weights are coated with the prepreg, and the U-shaped clamping device is pulled horizontally to enable the fixing piece and the prepreg to move relative to the prepreg on the weights on the upper side and the lower side. The method is difficult to realize effective clamping of the prepreg, the prepreg layer is easy to pull off under the action of tension and separate from the U-shaped clamping device, so that the force value is unstable, and accurate experimental data cannot be acquired to represent the friction slip characteristic of the prepreg.
Disclosure of Invention
Based on the above, the invention aims to provide a prepreg friction testing device and method, so as to solve the technical problems that a prepreg layer of the prepreg friction testing device in the prior art is easy to slip, the measured force value is unstable, and the experimental data is inaccurate.
In order to achieve the purpose, the invention adopts the following technical scheme:
provided is a prepreg friction test device including:
a clamping assembly comprising a first clamping assembly and a second clamping assembly symmetrically disposed, the first clamping assembly configured to secure a second prepreg layer, the second clamping assembly configured to secure the third prepreg layer, a lateral distance between the first clamping assembly and the second clamping assembly being adjustable;
a material clamping assembly for clamping a first prepreg layer, the material clamping assembly with the first prepreg layer clamped therebetween being configured to be clamped between the first and second clamping assemblies and to be slidable relative to the first and second clamping assemblies.
Preferably, when the material holding unit is interposed between the first clamping unit and the second clamping unit, both side surfaces of the first prepreg layer are bonded to the second prepreg layer and the third prepreg layer, respectively.
Preferably, the first clamping assembly comprises a first fixing plate and a first heating sheet which are clamped with each other, the first heating sheet is used for heating the first fixing plate, and the second prepreg layer is fixed on the first fixing plate; and/or
The second clamping component comprises a second fixing plate and a second heating plate which are clamped with each other, the second heating plate is used for heating the second fixing plate, and the third prepreg layer is fixed on the second fixing plate.
Preferably, the material clamping assembly comprises a material clamping part, the material clamping part comprises a material winding part and a pressing sheet, the first prepreg layer is configured to be wound on the material winding part, and the pressing sheet is used for pressing the end part of the first prepreg layer on the material winding part.
Preferably, the material clamping component further comprises a connecting part, one end of the connecting part is fixedly connected with the material clamping part, the other end of the connecting part is fixedly connected with a mechanical testing machine, and the mechanical testing machine is configured to apply a tensile force to the material clamping part through the connecting part.
Preferably, the clamping device further comprises a fixing platform, a baffle is arranged on the fixing platform and comprises a first baffle and a second baffle, and the first clamping assembly and the second clamping assembly are arranged between the first baffle and the second baffle.
Preferably, a guide rail is arranged between the first baffle and the second baffle, and the first clamping assembly and the second clamping assembly are slidably connected with the guide rail.
Preferably, the clamping device further comprises an air cylinder, the air cylinder is fixedly connected to the first baffle or the second baffle, and a driving end of the air cylinder can be abutted to the first clamping assembly or the second clamping assembly and is used for driving the first clamping assembly or the second clamping assembly to move along the guide rail.
The invention also provides a prepreg friction test method, which comprises the following steps:
fixing a first prepreg layer on the material clamping part;
fixedly connecting the material clamping part clamped with the first prepreg layer with a connecting part to form a material clamping assembly;
fixing the second prepreg layer on the first fixing plate;
clamping and connecting a first heating sheet with the first fixing plate to form a first clamping assembly;
fixing the third prepreg layer on a second fixing plate;
clamping a second heating sheet with the second fixing plate to form a second clamping assembly;
mounting the first and second clamping assemblies to a rail with the second and third prepreg layers facing each other;
placing the material gripping assembly between the first clamping assembly and the second clamping assembly;
driving an air cylinder, wherein the driving end of the air cylinder pushes the first clamping assembly and the second clamping assembly to move oppositely along the guide rail so as to clamp the material clamping assembly in the middle, and the first prepreg layer is respectively attached to the second prepreg layer and the third prepreg layer;
and respectively connecting a mechanical testing machine with the connecting part and the fixed platform, applying tension to the connecting part, enabling the first prepreg layer to slide relative to the second prepreg layer and the third prepreg layer, and reading out the tension value.
Preferably, in the step of fixedly connecting the material holding portion and the connecting portion, the material holding portion and the connecting portion are fixedly connected in a plurality of directions.
The invention has the beneficial effects that:
according to the prepreg friction testing device and method provided by the invention, the traditional U-shaped clamping device is replaced by the material clamping component, the prepreg pulling-out phenomenon is avoided, the clamping effect of the prepreg is ensured, and the material clamping component is clamped in the middle through the first clamping component and the second clamping component which are symmetrically arranged, so that the stability of the whole device is ensured, and more accurate measurement data can be obtained.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention 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 for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prepreg friction test apparatus provided by an embodiment of the invention;
FIG. 2 is a top view of a prepreg friction test apparatus provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a first clamping assembly of a prepreg friction testing apparatus provided by an embodiment of the invention;
fig. 4 is an assembly schematic diagram of a first fixing plate and a first heating plate of the prepreg friction testing apparatus provided in the embodiment of the present invention;
fig. 5 is a front view of a first fixing plate of the prepreg friction test apparatus provided in the embodiment of the present invention;
FIG. 6 is a partial cross-sectional view taken along A-A of FIG. 5;
FIG. 7 is a partial cross-sectional view taken along line B-B of FIG. 5;
fig. 8 is an assembly schematic diagram of a second fixing plate and a second heating plate of the prepreg friction testing apparatus provided in the embodiment of the present invention;
fig. 9 is a front view of a second fixing plate of the prepreg friction test apparatus provided in the embodiment of the present invention;
FIG. 10 is a partial cross-sectional view taken along line C-C of FIG. 9;
FIG. 11 is a partial cross-sectional view taken along line D-D of FIG. 9;
FIG. 12 is a schematic view of a material holding assembly of a prepreg friction testing apparatus provided in an embodiment of the invention;
FIG. 13 is another schematic view of a material holding assembly of a prepreg friction testing apparatus provided in an embodiment of the invention;
FIG. 14 is a schematic view of a material wrapping of a prepreg friction test apparatus provided in an embodiment of the invention;
FIG. 15 is a schematic representation of a preform for a prepreg friction test apparatus provided in an embodiment of the invention;
FIG. 16 is a schematic view of a connection portion of a prepreg friction test apparatus provided by an embodiment of the invention;
FIG. 17 is a side view of a material clamping assembly of a prepreg friction testing apparatus provided in an embodiment of the invention;
FIG. 18 is an enlarged view at E in FIG. 17;
fig. 19 is a flowchart of a prepreg friction test method according to an embodiment of the present invention.
In the figure: 1. a clamping assembly; 11. a first clamping assembly; 111. a first fixing plate; 1111. a first card slot; 112. a first heating sheet; 1121. a first terminal post; 113. a first slider; 1131. a first slideway; 114. a first gasket; 115. a second gasket; 116. a first silicone rubber layer; 12. a second clamping assembly; 121. a second fixing plate; 1211. a second card slot; 122. a second heating plate; 1221. a second terminal; 123. a second slider; 1231. a second slideway; 124. a third gasket; 125. a fourth gasket; 126. a second silicone rubber layer; 2. a material clamping assembly; 21. a material clamping part; 211. a material wrapping member; 2111. a winding block; 21111. a first boss; 21113. a second boss; 2112. winding a block side plate; 212. tabletting; 2121. a tabletting through hole; 2122. arc major; 2123. a chord; 22. a connecting portion; 221. an avoidance groove; 3. a fixed platform; 4. a baffle plate; 41. a first baffle plate; 42. a second baffle; 5. a guide rail; 6. a cylinder; 7. a limit bolt; 8. a micrometer screw; 9. a force sensor; 10. a mechanical testing machine joint; 1000. prepreg preparation; 1100. a first prepreg layer; 1200. a second prepreg layer; 1300. a third prepreg layer.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1-2, the present embodiment provides a prepreg friction test device. The device comprises a clamping assembly 1 and a material clamping assembly 2, wherein the clamping assembly 1 comprises a first clamping assembly 11 and a second clamping assembly 12 which are symmetrically arranged, the first clamping assembly 11 and the second clamping assembly 12 are identical in structure, and the transverse distance between the first clamping assembly 11 and the second clamping assembly 12 is adjustable. The first clamping assembly 11 is used to secure the second prepreg layer 1200, the second clamping assembly 12 is used to secure the third prepreg layer 1300, and the material holding assembly 2 is used to hold the first prepreg layer 1100.
The material holding assembly 2 can be clamped between the first clamping assembly 11 and the second clamping assembly 12 by adjusting the transverse distance between the first clamping assembly 11 and the second clamping assembly 12, at the moment, two side surfaces of the first prepreg layer 1100 are respectively tightly attached to the second prepreg layer 1200 and the third prepreg layer 1300, an upward pulling force is applied to the material holding assembly 2 by using a mechanical testing machine, so that the material holding assembly 2 holding the first prepreg layer 1100 can be in upward frictional sliding relative to the first clamping assembly 11 and the second clamping assembly 12, and the value of the frictional force can be read by using the mechanical testing machine, so that the frictional sliding characteristic of the prepreg 1000 can be obtained.
Specifically, as shown in fig. 1, the prepreg friction test apparatus provided in this embodiment further includes a fixing platform 3, and the first clamping assembly 11, the second clamping assembly 12, and the material clamping assembly 2 are all mounted on the fixing platform 3. The lower surface of fixed platform 3 is connected with mechanical testing machine joint 10 to ensure fixed platform 3's stability, prevent that fixed platform 3 from taking place to rock in the testing process. The fixed surface of fixed platform 3 is provided with baffle 4, and baffle 4 includes first baffle 41 and second baffle 42, fixes the both ends at fixed platform 3 upper surface respectively. The first clamping assembly 11 and the second clamping assembly 12 are arranged between the first baffle plate 41 and the second baffle plate 42, and the first baffle plate 41 and the second baffle plate 42 are used for laterally limiting the first clamping assembly 11 and the second clamping assembly 12, so that a laterally adjustable distance between the first clamping assembly 11 and the second clamping assembly 12 is ensured within a certain range.
Further, a guide rail 5 is provided between the first shutter 41 and the second shutter 42, and both ends of the guide rail 5 are fixed to the first shutter 41 and the second shutter 42, respectively. The guide rail 5 serves as a sliding rail for the first clamping assembly 11 and the second clamping assembly 12, and the first clamping assembly 11 and the second clamping assembly 12 are each slidably coupled to the guide rail 5 so as to be capable of high-precision lateral movement between the first shutter 41 and the second shutter 42. Alternatively, the number of the guide rails 5 is plural, and both ends of the plural guide rails 5 are respectively and uniformly fixed on the first shutter 41 and the second shutter 42. The provision of a plurality of guide rails 5 increases the rigidity of the entire apparatus, and makes the sliding movement of the first clamping unit 11 and the second clamping unit 12 smoother. Preferably, the number of the guide rails 5 is four, eight ends of the four guide rails 5 are symmetrically fixed at four corners of the first baffle 41 and four corners of the second baffle 42, respectively, and the four guide rails 5 can reduce interference with other components while ensuring rigidity and sliding smoothness of the device.
The prepreg friction test device provided by the embodiment further comprises an air cylinder 6 and a force sensor 9. The air cylinder 6 is used for driving the first clamping component 11 and/or the second clamping component 12 to move so as to provide clamping force for the material clamping component 2. Specifically, the cylinder body of the air cylinder 6 is fixedly mounted on the first baffle plate 41 or the second baffle plate 42, the piston rod of the air cylinder 6 is abutted against the first clamping assembly 11 or the second clamping assembly 12, and the telescopic motion of the piston rod drives the first clamping assembly and the second clamping assembly 12 to slide along the guide rail 5 in an opposite direction. The force sensor 9 is fixedly installed at an end of a piston rod of the air cylinder 6, and when the piston rod presses the first clamping assembly 11 and the second clamping assembly 12, the force sensor 9 directly abuts against the first clamping assembly 11 or the second clamping assembly 12 to measure the magnitude of the clamping force applied by the air cylinder 6. In the present embodiment, the pressure variation range of the output of the cylinder 6 is 0MPa to 32 MPa. Of course, in other embodiments, the output pressure variation range can be widened by replacing other types of cylinders 6.
Further, the prepreg friction test device provided by the embodiment further comprises a limit bolt 7 and a micrometer screw 8, wherein the limit bolt 7 and the micrometer screw 8 are both fixedly mounted on the first baffle 41 or the second baffle 42. The limiting bolt 7 penetrates through the first baffle plate 41 or the second baffle plate 42 and abuts against the first heating assembly 11 or the second heating assembly 12, and the position of the first clamping assembly 11 or the second clamping assembly 12 can be adjusted through rotation, so that the first clamping assembly 11 or the second clamping assembly 12 is kept vertical, and the second prepreg layer 1200 or the third prepreg layer 1300 and the first prepreg layer 1100 are tightly attached. The micrometer screw 8 penetrates through the first baffle 41 or the second baffle 42 and abuts against the first clamping component 11 or the second clamping component 12, the action and the working principle of the micrometer screw 8 are similar to those of the limiting bolt 7, and the micrometer screw 8 is used for finely adjusting the position of the first clamping component 11 or the second clamping component 12 through rotation, so that the close fit between the second prepreg layer 1200 or the third prepreg layer 1300 and the first prepreg layer 1100 is further ensured. Of course, in other embodiments, only the limit bolt 7 or only the micrometer screw 8 may be provided.
The clamping unit 1 is used to fix the second prepreg layer 1200 and the third prepreg layer 1300 and clamp the material holding unit 2, and since the first clamping unit 11 and the second clamping unit 12 have the same structure, the first clamping unit 11 will be described as an example in this embodiment. As shown in fig. 3 to 4, the first clamping assembly 11 includes a first fixing plate 111, a first heating blade 112, and a first slider 113. The first fixing plate 111 is used for being directly abutted to the material clamping component 2, one side surface of the first fixing plate 111 abutted to the material clamping component 2 is coated by the second prepreg layer 1200, and when the first fixing plate 111 is abutted to the material clamping component 2, the first prepreg layer 1100 is attached to the second prepreg layer 1200. A first clamping groove 1111 is formed in the other side surface of the first fixing plate 111, and the first clamping groove 1111 is used for clamping the first heating plate 112. The first heating sheet 112 is externally connected to a power source through the first connection terminal 1121, and when the first heating sheet 112 is clamped in the first fixing plate 111, the first heating sheet can heat the first fixing plate 111 and the second prepreg layer 1200 to detect the friction slip characteristics of the prepreg 1000 at different temperatures.
In this embodiment, the side surface of the first heating plate 112 and the first sliding block 113 are provided with threaded holes, and the first fixing plate 111 and the first heating plate 112 which are clamped together can be fixed on the first sliding block 113 through bolts, so as to form the first heating assembly 11. The first sliding block 113 is provided with a through first sliding channel 1131, and the guide rail 5 is inserted into the first sliding channel 1131, so that the first sliding block 113 can slide along the guide rail 5 in the transverse direction, thereby driving the first clamping assembly 11 to slide along the guide rail 5 as a whole. In this embodiment, the number of the first sliding blocks 113 is optionally plural, so as to make the sliding of the first clamping assembly 11 smoother. In this embodiment, corresponding to the number of the guide rails 5, preferably, the number of the first sliding blocks 113 is two, two first sliding blocks 113 are respectively fixed on two sides of the first heating plate 112, and each first sliding block 113 is provided with two first sliding ways 1131, so that the four guide rails 5 are respectively arranged in the corresponding first sliding ways 1131 in a penetrating manner. The arrangement mode can ensure the rigidity and the sliding stability of the device and reduce the interference among the components.
As shown in fig. 5 to 7, the first clamping assembly 11 further includes a first gasket 114 and a second gasket 115, and the first gasket 114 and the second gasket 115 are used to fix an end portion of the second prepreg layer 1200 on the first fixing plate 111, so as to improve the stability of the second prepreg layer 1200 covering the first fixing plate 111. The first and second spacers 114 and 115 are sheet-like structures fixed to the upper and lower surfaces of the first fixing plate 111 by bolts, respectively. To ensure the fixing effect, optionally, the number of the first gasket 114 and the second gasket 115 is plural. Preferably, in the present embodiment, the number of the first spacers 114 is two, two first spacers 114 are stacked on the upper surface of the first fixing plate 111, the number of the second spacers 115 is three, and three second spacers 115 are stacked on the lower surface of the first fixing plate 111.
When the second prepreg layer 1200 is fixed to the first clamping unit 11, the top end portion of the second prepreg layer 1200 is pressed into the two first pads 114 and the gap between the first pads 114 and the upper surface of the first fixing plate 111 by the stacked two first pads 114 in a U-shaped bend. Meanwhile, the stacked three second gaskets 115 press-fit the bottom end portions of the second prepreg layer 1200 in serpentine shapes in the three second gaskets 115 and the gaps between the second gaskets 115 and the lower surface of the first fixing plate 111. Further, the first clamping assembly 11 further includes a plurality of first silicone rubber layers 116, and the plurality of first silicone rubber layers 116 are disposed between the stacked three second gaskets 115, for increasing the friction between the second gaskets 115 and the second prepreg layer 1200, so as to enhance the fixing effect.
By adopting the fixing mode, the second prepreg layer 1200 is not easy to pull off from the first clamping component 11, and the success rate of the friction test is improved. After the top end portion and the bottom end portion of the second prepreg layer 1200 are fixed, the middle portion of the second prepreg layer is tensioned and covers the surface of the first fixing plate 111 facing the material holding assembly 2 so as to be attached to the first prepreg layer 1100 held by the material holding assembly 2.
As shown in fig. 9 to 11, the second clamping assembly 12 fixes the third prepreg layer 1300 in the same manner as the first clamping assembly 11 fixes the second prepreg layer 1200, and the description thereof is omitted. After the third prepreg layer 1300 is fixed to the second clamping assembly 12, the middle portion of the third prepreg layer is tensioned and covered on the surface of the second fixing plate 121 facing the material holding assembly 2 to adhere to the first prepreg layer 1100 held by the material holding assembly 2.
The construction of the material gripping assembly 2 is shown in fig. 12-13. The material clamping assembly 2 comprises a material clamping part 21 and a connecting part 22, wherein the material clamping part 21 is used for clamping a first prepreg layer 1100, one end of the connecting part 22 is fixedly connected with the material clamping part 21, the other end of the connecting part 22 is fixedly connected with the connector 10 of the mechanical testing machine, and the mechanical testing machine applies a pulling force to the material clamping part 21 through the connecting part 22 along the opposite direction of the gravity direction, so that the first prepreg layer 1100 clamped by the material clamping part 21 longitudinally slides relative to a second prepreg layer 1200 and a third prepreg layer 1300.
Further, the material holding portion 21 may be fixedly connected to the connecting portion 22 in different directions, fig. 12 shows a schematic view of an embodiment in which the material holding portion 21 is fixedly connected to the connecting portion 22 in a first direction, and fig. 13 shows a schematic view of an embodiment in which the material holding portion 21 is fixedly connected to the connecting portion 22 in a second direction. Connecting the material clamping portion 21 to the connecting portion 22 along different directions can make the extending direction of the first prepreg 1100 fiber clamped on the material clamping portion 21 and the applied pulling force form different angles, so that the friction slip characteristics between prepregs with different fiber angles can be tested.
Specifically, the material holding portion 21 includes a material winding member 211 on which the first prepreg layer 1100 is wound, and a plurality of pressing pieces 212 that press the first prepreg layer 1100 against the material winding member 211 from the left and right sides of the material winding member 211. As shown in fig. 14, the material winding member 211 includes a winding block 2111 and a winding block side plate 2112 which are fixedly connected, and the winding block 2111 has a hexahedral structure which can be fitted into the pressing piece 212. The winding block side plate 2112 is an arc-like plate-shaped structure, and divides the winding block 2111 into a first boss 21111 and a second boss 21112 which are symmetrical, the first boss 21111 and the second boss 21112 can be respectively embedded in the pressing sheets 212 at two sides of the winding block side plate 2112, and the pressing sheets 212 at two sides are respectively abutted against the winding block side plate 2112.
As shown in FIG. 15, the sheeting 212 is a major arc structure that includes major arcs 2122 and chords 2123. The pressing piece 212 is provided with a pressing piece through hole 2121, and the winding block 2111 is fitted into the pressing piece through hole 2121. When the pressing piece 212 abuts against the winding block side plate 2112 while the pressing piece 2111 is fitted into the pressing piece through hole 2121, a chord 2123 of the pressing piece 212 is located within the winding block side plate 2112 and does not exceed the arc-shaped edge of the winding block side plate 2112. In this embodiment, the pressing plate 212 is uniformly provided with a plurality of threaded holes along the major arc 2122 thereof, the winding block side plate 2112 is provided with a plurality of threaded holes corresponding to the positions of the partial threaded holes on the pressing plate 212 along the arc edge thereof, and the pressing plate 212 and the winding block side plate 2112 are fixedly connected by bolts.
The structure of the connecting portion 22 is shown in fig. 16. Connecting portion 22 is rectangular platelike structure, and its top is used for connecting 10 fixed connection with mechanical testing machine, and the bottom is provided with a plurality of screw holes, and a plurality of screw holes correspond with the partial screw hole position on the preforming 212 to through bolt and preforming 212 fixed connection, thereby realize with the fixed connection of material clamping part 21. Further, an avoiding groove 221 is further arranged at the bottom end of the connecting portion 22, and the avoiding groove 221 is used for avoiding the winding block 2111 in a regular hexahedron shape, so that the material clamping portion 21 can be fixedly connected to the connecting portion 22 along multiple directions, and friction slip characteristics between prepreg layers with different fiber angles can be tested.
The manner in which the first prepreg layer 1100 is secured in the material clamp 21 is illustrated in fig. 17-18. The first prepreg layer 1100 is covered from the top down on the surface of the winding block 2111, and both end portions thereof are pressed in a U-shape against both side surfaces of the winding block side plate 2112 by two inner pressing pieces 212 attached from the left and right sides of the winding block 2111. Specifically, the first prepreg layer 1100 is bent outward beyond the inner sheet 212 so as to cover both side surfaces of the inner sheet 212, and then the two outer sheets 212 are mounted on the winding block 2111 from the left and right sides, so that the first prepreg layer 1100 covering the surface of the inner sheet 212 is pressed between the inner sheet 212 and the outer sheet 212. The material winding piece 211 and the pressing piece 212 are fastened by bolts, so that the first prepreg layer 1100 is clamped, and the first prepreg layer 1100 is tensioned on the left side surface and the right side surface of the winding block 2111 to be respectively attached to the second prepreg layer 1200 and the third prepreg layer 1300.
As shown in fig. 19, the present invention also provides a prepreg friction test method, including the steps of:
a. winding the first prepreg layer 1100 on the material winding piece 211 of the material clamping part 21, and pressing the first prepreg layer 1100 on the material winding piece 211 by using the pressing piece 212;
b. fixedly connecting the material clamping part 21 clamping the first prepreg layer 1100 with the connecting part 22 to form a material clamping assembly 2;
c. fixing the second prepreg layer 1200 on the first fixing plate 111;
d. fixing the third prepreg layer 1300 on the second fixing plate 121;
e. clamping the first heating plate 112 with the first fixing plate 111 to form a first clamping assembly 11;
f. clamping the second heating plate 122 to the second fixing plate 121 to form a second clamping assembly 12;
g. mounting the first and second clamp assemblies 11, 12 onto the rail 5 with the second and third prepreg layers 1200, 1300 facing each other;
h. placing the material holding assembly 2 between the first clamping assembly 11 and the second clamping assembly 12;
i. driving the air cylinder 6, so that the driving end of the air cylinder 6 pushes the first clamping assembly 11 and the second clamping assembly 12 to move oppositely along the guide rail 5, so as to clamp the material clamping assembly 2 in the middle, and the first prepreg layer 1100 is respectively attached to the second prepreg layer 1200 and the third prepreg layer 1300;
j. the joint 10 of the mechanical testing machine is connected with the connecting part 22 and the fixed platform 3 respectively, tensile force is applied to the connecting part 22, the first prepreg layer 1100 slides relative to the second prepreg layer 1200 and the third prepreg layer 1300, and the tensile force value is read.
Wherein, in the step a, the following operation process is specifically included:
firstly, covering a first prepreg layer 1100 after cutting on a winding block 2111 of a material winding piece 211, and enabling the middle part of the first prepreg layer 1100 to cover the upper surface of the winding block 2111;
in the second step, the material winding piece 211 is horizontally placed with the winding block 2111 facing upward toward the side of the first clamping assembly 11, and a pressing piece 212 is mounted on the winding block 2111 with the pressing piece 212 abutting against the winding block side plate 2112, at which time the first boss 21111 of the winding block 2111 passes through the pressing piece through hole 2121, and the chord 2123 of the pressing piece 212 is located within the winding block side plate 2112. Under the action of the pressing sheet 212, part of the first prepreg layer 1100 is attached to the lower surface of the winding block 2111 and one side surface of the winding block side plate 2112;
third, the first prepreg layer 1100 is folded upwards along the chords 2123 of the pressing sheet 212, so that the first prepreg layer 1100 covers the two side surfaces of the pressing sheet 212;
fourthly, another pressing piece 212 is mounted on the winding block 2111 so that the first boss 21111 of the winding block 2111 passes through the pressing piece through hole 212 and the chord 2123 of the pressing piece 212 is located within the winding block side plate 2112, at which time, the two pressing pieces 212 which are successively pressed clamp the portion of the first prepreg layer 1100 covering the outer surface of the inner pressing piece 212 between the two pressing pieces 212;
fifthly, the material winding piece 211 is turned over, the side surface of the winding block 2111 facing the second clamping assembly 12 is upward, one pressing piece 212 is installed on the winding block 2111, the pressing piece 212 is abutted with the winding block side plate 2112, at the moment, the second boss 21112 of the winding block 2111 penetrates through the pressing piece through hole 212, and the chord 2123 of the pressing piece 212 is positioned in the range of the winding block side plate 2112. Under the action of the pressing sheet 212, part of the first prepreg layer 1100 is attached to the lower surface of the winding block 2111 and the other side surface of the winding block side plate 2112;
sixthly, turning the first prepreg layer 1100 upwards along the chords 2123 of the pressing sheet 212 so that the first prepreg layer 1100 covers the two side surfaces of the pressing sheet 212;
seventhly, another pressing sheet 212 is mounted on the winding block 2111, so that the second boss 21112 of the winding block 2111 passes through the pressing sheet through hole 212 and the chord 2123 of the pressing sheet 212 is positioned within the winding block side plate 2112, and at this time, the two pressing sheets 212 which are successively pressed clamp the portion of the first prepreg layer 1100 covering the outer surface of the inner pressing sheet 212 between the two pressing sheets 212;
in the eighth step, the material winding member 211 and the four pressing plates 212 are fixed together by bolts, thereby fixing the first prepreg layer 1100 to the material holding portion 21.
In the step b, the following operation processes are specifically included:
firstly, rotating the material clamping part 21 to enable the fiber direction in the first prepreg layer 1100 fixed by the material clamping part 21 to reach a preset direction;
and secondly, detaching the bolts which need to be connected with the connecting parts 22 on the material clamping part 21, aligning the threaded holes corresponding to the positions on the pressing sheets 212 and the connecting parts 22, and fixing the pressing sheets 212 and the connecting parts 22 by using the bolts which are just detached, thereby realizing the fixation of the material clamping part 21 and the connecting parts 22.
In the above operation process of step b, since the avoiding groove 221 is formed at the bottom end of the connecting portion 22, the material holding portion 21 does not interfere with the connecting portion 22, so that the material holding portion 21 has more rotating spaces, and further, the preset direction of the fibers in the first prepreg layer 1100 has more choices.
In the step c, the following operation processes are specifically included:
a first step of horizontally placing the first fixing plate 111 so that the side of the first fixing plate 111 facing the material holding assembly 2 is placed upward, and covering the second prepreg layer 1200 thereon;
secondly, bending the bottom end of the second prepreg layer 1200 to cover the lower surface of the first fixing plate 111 with the second prepreg layer 1200;
third, the inner layer second gasket 115 covered with the first silicone rubber layer 116 is press-fitted on the lower surface of the first fixing plate 111, so that a part of the second prepreg layer 1200 is clamped between the inner layer second gasket 115 and the lower surface of the first fixing plate 111;
fourthly, bending the second prepreg layer 1200 to cover the outer side surface of the inner layer second gasket 115;
a fifth step of pressing the second gasket 115 of the intermediate layer onto the second gasket 115 of the inner layer so that a part of the second prepreg layer 1200 is clamped between the second gasket 115 of the inner layer and the second gasket 115 of the intermediate layer;
sixthly, bending the second prepreg layer 1200 to cover the outer surface of the second gasket 115 of the interlayer;
seventhly, pressing the outer layer second gasket 115 covered with the silicone rubber layer on the middle layer second gasket 115 to clamp a part of the second prepreg layer 1200 between the middle layer second gasket 115 and the outer layer second gasket 115;
eighthly, fixing the stacked three second spacers 115 to the lower surface of the first fixing plate 111 by using bolts;
ninth, bending the top end of the second prepreg layer 1200 to cover the second prepreg layer 1200 on the upper surface of the first fixing plate 111;
tenth, the inner layer first pad 114 is pressed on the top surface of the first fixing plate 111, so that the portion of the second prepreg layer 1200 is clamped between the inner layer first pad 114 and the upper surface of the first fixing plate 111;
a tenth step of bending the second prepreg layer 1200 to cover the outer surface of the inner layer first gasket 114;
in a thirteenth step, outer first gasket 114 is pressed against inner first gasket 114 such that a portion of second prepreg layer 1200 is sandwiched between inner first gasket 114 and outer first gasket (114).
Fourteenth, the stacked two first spacers 114 are fixed to the upper surface of the first fixing plate 111 by bolts.
Through the above operation processes, the second prepreg layer 1200 can be firmly fixed to the first clamping member 11, so that the second prepreg layer 1200 is not likely to slip off during the test.
In the step d, the following operation processes are specifically included:
a first step of horizontally placing a second fixing plate 121, so that the side of the second fixing plate 121 facing the material holding assembly 2 is placed upward, and covering a third prepreg layer 1300 thereon;
secondly, bending the bottom end of the third prepreg layer 1300 to cover the lower surface of the first fixing plate 111 with the third prepreg layer 1300;
third, the inner fourth pad 125 covered with the second silicone rubber layer 126 is press-fitted to the lower surface of the second fixing plate 121, so that a part of the third prepreg layer 1300 is clamped between the fourth pad 125 and the lower surface of the second fixing plate 121;
fourthly, bending the third prepreg layer 1300 to cover the outer side surface of the inner layer fourth gasket 125;
a fifth step of pressing the intermediate layer fourth pad 125 against the inner layer fourth pad 125 so that a portion of the third prepreg layer 1300 is sandwiched between the inner layer fourth pad 125 and the intermediate layer fourth pad 125;
sixthly, bending the third prepreg layer 1300 to cover the outer side surface of the fourth pad 125 of the interlayer;
seventhly, pressing the outer layer fourth gasket 125 covered with the silicone rubber layer on the middle layer fourth gasket 125, so that a part of the third prepreg layer 1300 is clamped between the middle layer fourth gasket 125 and the outer layer fourth gasket 125;
in the eighth step, the stacked three fourth spacers 125 are fixed to the lower surface of the second fixing plate 121 by bolts.
Ninth, bending the top end of the third prepreg layer 1300 to cover the upper surface of the second fixing plate 121 with the third prepreg layer 1300;
a tenth step of press-fitting the third gasket 124 of the inner layer on the top surface of the second fixing plate 121 so that the portion of the third prepreg layer 1300 is clamped between the third gasket 124 of the inner layer and the upper surface of the second fixing plate 121;
a tenth step of bending the third prepreg layer 1300 to cover the outer surface of the third pad 124;
in a thirteenth step, the outer third gasket 124 is pressed against the inner third gasket 124, such that a portion of the third prepreg layer 1300 is sandwiched between the inner third gasket 124 and the outer third gasket 124.
In the fourteenth step, the stacked two third spacers 124 are fixed to the top surface of the second fixing plate 121 by bolts.
Through the above operation processes, the third prepreg layer 1300 can be firmly fixed to the second clamping assembly 12, so that the third prepreg layer 1300 is not likely to slip off during the test.
The working process of the prepreg friction testing device provided by the invention is described below with reference to the accompanying drawings:
a first step of fixing a first prepreg layer 1100 on the material holding assembly 2, see in particular steps a-b;
a second step of fixing a second prepreg layer 1200 and a third prepreg layer 1300 on the first clamping assembly 11 and the second clamping assembly 12, respectively, see steps c-f;
a third step of mounting the first clamping assembly 11 and the second clamping assembly 12 on the rail 5, such that the second prepreg layer 1200 and the third prepreg layer 1300 are opposite, see step g specifically;
fourthly, placing the material clamping assembly 2 between the first clamping assembly 11 and the second clamping assembly 12 to enable the bottom end of the first prepreg layer 1100 to be flush with the bottom ends of the second prepreg layer 1200 and the third prepreg layer 1300, specifically referring to the step h;
fifthly, driving the air cylinder 6 to enable a piston rod of the air cylinder 6 to push the first clamping assembly 11 and the second clamping assembly 12 to move oppositely along the guide rail 5 so as to clamp the material clamping assembly 2 in the middle, and adjusting the air cylinder 6 to enable a pressure value measured by the force sensor 9 to reach a preset value, specifically referring to step i;
sixthly, rotating the limit bolt 7, and adjusting the position of the first fixing plate 111 or the second fixing plate 121 to enable the second prepreg layer 1200 or the third prepreg layer 1300 to be tightly attached to the first prepreg layer 1100;
seventhly, fine adjustment is carried out on the first clamping component 11 or the second clamping component 12 by using a micrometer screw 8, and the fitting degree of the second prepreg layer 1200 or the third prepreg layer 1300 and the first prepreg layer 1100 is further ensured;
eighthly, the first heating sheet 112 heats the first fixing plate 111 and the second prepreg layer 1200 to a preset temperature, and the second heating sheet 122 heats the second fixing plate 121 and the second prepreg layer 1200 to the same preset temperature, and the temperature is kept for ten minutes, so that the temperature distribution is uniform;
ninth, setting parameters such as the tested stretching rate and the like on the control software of the mechanical testing machine, and clearing;
and step ten, stretching the material clamping component 2 by using a mechanical testing machine, obtaining a tension value, and calculating a friction coefficient according to a friction theory. In this embodiment, the coefficient of friction is the ratio between the tension value and twice the preset pressure value.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A prepreg friction test device, comprising:
a clamping assembly (1), the clamping assembly (1) comprising a first clamping assembly (11) and a second clamping assembly (12) which are symmetrically arranged, the first clamping assembly (11) being configured to fix a second prepreg layer (1200), the second clamping assembly (12) being configured to fix a third prepreg layer (1300), a lateral distance between the first clamping assembly (11) and the second clamping assembly (12) being adjustable;
a material clamping assembly (2), the material clamping assembly (2) being configured to clamp a first prepreg layer (1100), the material clamping assembly (2) with the first prepreg layer (1100) clamped thereto being configured to be clamped between the first clamping assembly (11) and the second clamping assembly (12) and to be slidable relative to the first clamping assembly (11) and the second clamping assembly (12).
2. The prepreg friction test device according to claim 1, wherein both sides of the first prepreg layer (1100) are respectively attached to the second prepreg layer (1200) and the third prepreg layer (1300) when the material holding assembly (2) is sandwiched between the first clamping assembly (11) and the second clamping assembly (12).
3. The prepreg friction test device according to claim 2, wherein the first clamping assembly (11) comprises a first fixing plate (111) and a first heating sheet (112) clamped with each other, the first heating sheet (112) is used for heating the first fixing plate (111), and the second prepreg layer (1200) is fixed on the first fixing plate (111); and/or
The second clamping assembly (12) comprises a second fixing plate (121) and a second heating sheet (122) which are clamped with each other, the second heating sheet (122) is used for heating the second fixing plate (121), and the third prepreg layer (1300) is fixed on the second fixing plate (121).
4. The prepreg friction test device according to claim 1, wherein the material holding assembly (2) comprises a material holding portion (21), the material holding portion (21) comprises a material winding member (211) and a pressing sheet (212), the first prepreg layer (1100) is configured to be wrapped on the material winding member (211), and the pressing sheet (212) is used for pressing an end of the first prepreg layer (1100) on the material winding member (211).
5. The prepreg friction test device according to claim 4, characterized in that the material clamping assembly (2) further comprises a connecting portion (22), one end of the connecting portion (22) is fixedly connected with the material clamping portion (21), and the other end is fixedly connected with a mechanical testing machine, and the mechanical testing machine is configured to apply a tensile force to the material clamping portion (21) through the connecting portion (22).
6. The prepreg friction test device according to claim 1, further comprising a fixed platform (3), wherein a baffle (4) is disposed on the fixed platform (3), the baffle (4) comprises a first baffle (41) and a second baffle (42), and the first clamping assembly (11) and the second clamping assembly (12) are disposed between the first baffle (41) and the second baffle (42).
7. The prepreg friction test device according to claim 6, characterized in that a guide rail (5) is arranged between the first baffle (41) and the second baffle (42), and the first clamping assembly (11) and the second clamping assembly (12) are slidably connected with the guide rail (5).
8. The prepreg friction test device according to claim 7, further comprising an air cylinder (6), wherein the air cylinder (6) is fixedly connected to the first baffle (41) or the second baffle (42), and a driving end of the air cylinder (6) can abut against the first clamping assembly (11) or the second clamping assembly (12) for driving the first clamping assembly (11) or the second clamping assembly (12) to move along the guide rail (5).
9. A prepreg friction test method is characterized by comprising the following steps:
fixing a first prepreg layer (1100) on the material clamping part (21);
fixedly connecting the material clamping part (21) clamped with the first prepreg layer (1100) with a connecting part (22) to form a material clamping assembly (2);
fixing the second prepreg layer (1200) on the first fixing plate (111);
clamping a first heating sheet (112) with the first fixing plate (111) to form a first clamping assembly (11);
fixing the third prepreg layer (1300) on the second fixing plate (121);
clamping a second heating sheet (122) with the second fixing plate (121) to form a second clamping assembly (12);
mounting the first clamping assembly (11) and the second clamping assembly (12) onto a rail (5) with the second prepreg layer (1200) and the third prepreg layer (1300) facing each other;
-placing the material gripping assembly (2) between the first clamping assembly (11) and the second clamping assembly (12);
driving an air cylinder (6) to enable a driving end of the air cylinder (6) to push the first clamping assembly (11) and the second clamping assembly (12) to move oppositely along the guide rail (5) so as to clamp the material clamping assembly (2) in the middle, and enabling the first prepreg layer (1100) to be attached to the second prepreg layer (1200) and the third prepreg layer (1300) respectively;
and respectively connecting a mechanical testing machine with the connecting part (22) and the fixing platform (3), applying a tensile force to the connecting part (22), enabling the first prepreg layer (1100) to slide relative to the second prepreg layer (1200) and the third prepreg layer (1300), and reading the tensile force value.
10. The prepreg friction test method according to claim 9, wherein in the step of fixedly connecting the material holding portion (21) with the connecting portion (22), the material holding portion (21) is fixedly connected with the connecting portion (22) in a plurality of directions.
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| CN116106215A (en) * | 2023-04-12 | 2023-05-12 | 佛山仙湖实验室 | Prepreg clamping mechanism, friction measuring device and method |
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| CN111272647B (en) | 2022-12-20 |
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