CN113188881B - Preparation method of impregnated yarn sample and compression test fixture thereof - Google Patents
Preparation method of impregnated yarn sample and compression test fixture thereof Download PDFInfo
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- CN113188881B CN113188881B CN202110305774.5A CN202110305774A CN113188881B CN 113188881 B CN113188881 B CN 113188881B CN 202110305774 A CN202110305774 A CN 202110305774A CN 113188881 B CN113188881 B CN 113188881B
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- 238000012669 compression test Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 32
- 238000007598 dipping method Methods 0.000 claims abstract description 25
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004917 carbon fiber Substances 0.000 claims abstract description 16
- 239000000741 silica gel Substances 0.000 claims abstract description 15
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 11
- 239000000835 fiber Substances 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 description 8
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229920006253 high performance fiber Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
- B29C33/405—Elastomers, e.g. rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/36—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and impregnating by casting, e.g. vacuum casting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a preparation method of a gum dipping yarn sample and a compression test fixture thereof, wherein the preparation method comprises the following steps: preparing a sample mold of a silica gel material, wherein a slit for embedding a impregnated yarn is formed along the middle part of the mold; providing carbon fiber yarns, and burying the gum dipping yarns in the gaps; pouring the prepared resin into the sample mold, solidifying and demolding to obtain a gum dipping yarn sample, wherein the gum dipping yarn sample is a two-section cylinder sample. The impregnated yarn of the test section of the impregnated yarn sample prepared by the invention has uniform diameter and stable fiber volume fraction.
Description
Technical Field
The invention relates to the technical field of mechanical property testing of materials, in particular to a preparation method of a dipped yarn sample and a compression testing clamp thereof.
Background
Starting from nineties of the twentieth century, the preparation technology and process of high-performance fibers represented by carbon fibers, special glass fibers, aramid fibers, ultra-high molecular polyethylene fibers and the like have been rapidly developed, and are widely applied to various fields of aerospace, automobiles, wind power and the like. Fiber yarn is the primary form of use of fibers in composites, and therefore its mechanical properties have a significant impact.
The gum dipping yarn test is a commonly used method for detecting and evaluating the mechanical properties of carbon fibers in the current engineering application. At present, mechanical property evaluation of carbon fibers is mostly focused on the aspect of tensile property, and no corresponding standard exists in compression test of impregnated yarns at present.
Compared with the traditional laminated composite material, the carbon fiber woven composite material has greatly improved impact resistance and transverse performance, but the woven composite material is mainly woven by carbon fiber yarns and is formed by matrix infiltration. Thus, on a microscopic scale, the woven composite material mainly comprises two components, namely a matrix and a sizing, while the sizing plays a main bearing role, which has a great influence on the mechanical properties of the woven composite material. In the multi-scale simulation analysis method of the mechanical properties of the woven composite material, a microscopic finite element model of the woven composite material is established, wherein the key step is to define the mechanical property parameters of the single dip yarn. However, the current compression performance test of the gum dipping yarn lacks a corresponding method, so that the gum dipping yarn can only pass the theory or the finite element prediction and lacks sufficient test verification.
The preparation and testing technology of the carbon fiber impregnated yarn sample in the prior art has the following defects: firstly, the efficiency is low, the sample preparation needs to be cured twice, and the inconsistent types of the resin of the gum dipping yarn and the resin of the resin block can cause early failure of an interface; secondly, the diameter of the prepared gum dipping yarn sample is unstable, and errors of strength measurement values can be introduced; thirdly, as errors exist in the slotting diameter of the mould and the diameter of the impregnated yarn, the impregnated yarn cannot be ensured to be positioned at the middle part of the two resin protection ends, and the accuracy of the test is also affected; fourth, because of adopting the metal mold, need to be closed, demolded, the processing cost is high, inefficiency, commonality are bad; fifth, the clamping of the sample before loading is complex and cumbersome, and the sample needs to be placed in a limiting clamp and then compressed.
Disclosure of Invention
The invention mainly aims to provide a preparation method of a impregnated yarn sample and a compression test clamp thereof, which are used for solving the defects that the carbon fiber impregnated yarn compression test method in the prior art cannot ensure the constant cross section area and the stable fiber volume fraction of the sample, and the clamp is complex, has poor loading coaxiality and the like.
According to one aspect of an embodiment of the present invention, there is provided a method for preparing a dipped yarn sample, comprising:
Preparing a sample mold of a silica gel material, wherein a slit for embedding a impregnated yarn is formed along the middle part of the mold; providing carbon fiber yarns, and burying the gum dipping yarns in the gaps; pouring the prepared resin into the sample mold, solidifying and demolding to obtain a gum dipping yarn sample, wherein the gum dipping yarn sample is a two-section cylinder sample.
Wherein, the sample mould of preparation silica gel material includes: manufacturing a two-section cylinder gum dipping yarn sample male die; providing a container in a cube shape, and placing the male mold of the dipped yarn sample in the container; pouring the prepared silica gel into the container, cutting a gap on the silica gel at the middle part of the male die after the silica gel is completely solidified, and demolding.
Wherein the length of the carbon fiber yarn is greater than the length of the sample mold.
There is also provided in accordance with another aspect of an embodiment of the present invention a compression test fixture for a dipped yarn specimen, including: the device comprises a rigid frame, an upper linear bearing, a lower linear bearing, an upper chuck, a lower chuck and a plurality of fastening bolts; the rigid frame comprises an upper frame and a lower frame, the upper frame defines the upper linear bearing, the lower frame defines the lower linear bearing, and the upper linear bearing and the lower linear bearing are coaxial; the upper linear bearing is connected with the upper chuck, the lower linear bearing is connected with the lower chuck, and the upper chuck and the lower chuck are coaxial; and the plurality of fastening bolts are used for limiting the holding positions of the dipped yarn samples so that the dipped yarn samples are coaxial with the upper clamping head and the lower clamping head.
The gum dipping yarn sample comprises a middle section to be tested and resin protection ends at two ends, and the section shape of the resin protection ends is square.
The gum dipping yarn sample comprises a first resin protection end and a second resin protection end, wherein part of the first resin protection end is clamped in the upper chuck, and part of the second resin protection end is clamped in the lower chuck; 2 fastening bolts penetrate through the side wall of the upper chuck to fasten the two adjacent side walls of the first resin protection end, and 2 fastening bolts penetrate through the side wall of the lower chuck to fasten the two adjacent side walls of the second resin protection end, so that the section to be tested of the dipped yarn sample is coaxial with the upper chuck and the lower chuck
Wherein the rigid frame has a hollow portion.
According to the technical scheme of the invention, the sample containing the resin protection end is cast and molded at one time by utilizing the silica gel mold, so that the time and economic cost for preparing the sample are greatly reduced, and the impregnated yarn of the test section is uniform in diameter and stable in fiber volume fraction. In addition, a novel compression test fixture is provided, so that the machining cost of the fixture is reduced while the accurate compression loading is ensured, and the test efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a flow chart of a method of preparing a rubberized yarn sample according to an embodiment of the invention;
FIG. 2 is a schematic illustration of sample mold preparation according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of compressed sample preparation according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a compression test fixture according to an embodiment of the invention
FIG. 5 is a schematic view of a chuck according to an embodiment of the invention;
Fig. 6 is a schematic view of a sample defined by fastening bolts according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.
According to an embodiment of the present invention, there is provided a method for preparing a dipped yarn sample, referring to fig. 1 and 3, the method comprising the steps of:
Step S102, preparing a sample mold of a silica gel material, wherein a gap for embedding a gum dipping yarn is formed along the middle part of the mold;
specifically, referring to fig. 2, specific steps of preparing a sample mold of a silicone material may include:
Manufacturing a two-section cylinder gum dipping yarn sample male die, wherein the two ends of the male die are cuboid, and the middle part of the male die is a cylinder; providing a container in a cube shape, and placing the male mold of the dipped yarn sample in the container; pouring the prepared silica gel into the container, cutting gaps on the silica gel at the middle part and the two ends of the male die after the silicon rubber is completely solidified, and demolding.
Step S104, providing carbon fiber yarns, and embedding the impregnated yarns into gaps of a sample mold;
wherein the length of the carbon fiber yarn is greater than the length of the sample mold.
And S106, pouring the prepared resin into the sample mold, curing and demolding to obtain a gum dipping yarn sample, wherein the gum dipping yarn sample is a two-section cylinder sample, namely, the gum dipping yarn sample comprises a middle section to be tested and resin protection ends at two ends, the section to be tested is a cylinder, and the section shape of the resin protection end is square with chamfer angles.
According to the preparation method, the gum dipping yarn sample containing the resin protection end is cast and molded only once without secondary solidification, so that the preparation flow and time of the sample are greatly shortened. And by means of the reverse die of the male die with the fixed diameter, the control of the constant cross-sectional area and the constant fiber volume fraction of the impregnated yarn test section can be realized.
There is also provided in accordance with an embodiment of the present invention a compression test fixture for a dipped yarn specimen, with reference to fig. 4, the compression test fixture including: a rigid frame 4, an upper linear bearing 43, a lower linear bearing 44, an upper chuck 45, a lower chuck 46, a plurality of fastening bolts, and a dipped yarn sample 47;
the rigid frame 4 is a hollow frame in the middle, and the rigid frame 4 comprises an upper frame 41 and a lower frame 42. The upper frame 41 defines an upper linear bearing 43, the lower frame 42 defines a lower linear bearing 44, and the upper linear bearing 43 and the lower linear bearing 44 are coaxial. As shown, the upper linear bearing 43 passes through the upper frame 41, the lower linear bearing 44 passes through the lower frame 42, and one end of the upper linear bearing 43 and one end of the lower linear bearing 44 are opposed to each other in the hollow portion of the rigid frame 4.
The upper linear bearing 43 is connected to the upper chuck 45, the lower linear bearing 44 is connected to the lower chuck 46, the upper chuck 45 and the lower chuck 46 are disposed opposite to each other in the hollow portion of the rigid frame 4, and the upper chuck 45 and the lower chuck 46 are coaxial. When the chuck moves up and down in the linear bearing, the balls in the linear bearing can reduce friction between the chuck and the bearing during compression, and influence on accuracy of experimental results is reduced. Referring to fig. 5, the collet has a square interior cavity with a chamfer as a gripping portion for gripping a dip yarn sample. The cross section of the holding part is slightly larger than the cross section of the resin protection end of the dipped yarn sample, and can accommodate a part of the resin protection end.
In the present embodiment, the compression test fixture includes 4 fastening bolts, wherein the side wall of the upper jaw 45 has 2 fastening bolt holes, and fastening bolts 51 and 52 are installed; the side wall of the lower chuck 46 also has 2 fastening bolt holes, and fastening bolts 53 and 54 are installed. As shown in fig. 4, the fastening bolt holes on the upper and lower clips correspond in position. From the view of the clamping part, the two adjacent side walls of the clamping part are provided with fastening bolts, and the other two adjacent side walls are not provided with the bolts.
After the sample is mounted, the two bolts on the same chuck apply forces to the resin protection end respectively, and the forces in the two directions (the directions indicated by arrows in fig. 5 and 6) are in the same horizontal plane and are perpendicular to each other. When the bolts are screwed down, the resin protection end is tightly attached to the inner wall of the clamping part, which is not provided with the bolts, under the action of the fastening bolts, so that the resin protection end and the sample can be kept fixed relative to the clamping head, and the axis of the section to be tested is coaxial with the axis of the clamp.
Through above-mentioned compression test fixture, can realize the effective test to the sample through simple assembly and sample centre gripping, both guaranteed the axiality of load when compressing, reduced the centre gripping degree of difficulty again, improved test efficiency.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (3)
1. A method of preparing a dipped yarn specimen comprising:
preparing a sample mold of a silica gel material, wherein a slit for embedding carbon fiber yarns is formed along the middle part of the mold;
Providing carbon fiber yarns, wherein the length of the carbon fiber yarns is longer than that of the sample mold, and burying the carbon fiber yarns in the gaps;
Pouring the prepared resin into the sample mold, solidifying and demolding to obtain a gum dipping yarn sample, wherein the gum dipping yarn sample is a two-section cylinder sample, the gum dipping yarn sample comprises a middle section to be tested, a first resin protection end and a second resin protection end which are respectively positioned at two ends, and the section shape of the resin protection end is square with chamfer angles;
The sample mold for preparing the silica gel material comprises:
Manufacturing a two-section cylinder gum dipping yarn sample male die;
providing a container in a cube shape, and placing the male mold of the dipped yarn sample in the container;
Pouring the prepared silica gel into the container, cutting a gap on the silica gel at the middle part of the male die after the silica gel is completely solidified, and demolding.
2. A compression test fixture for a dipped yarn specimen comprising: the device comprises a rigid frame, an upper linear bearing, a lower linear bearing, an upper chuck, a lower chuck and a plurality of fastening bolts;
The rigid frame comprises an upper frame and a lower frame, the upper frame defines the upper linear bearing, the lower frame defines the lower linear bearing, and the upper linear bearing and the lower linear bearing are coaxial; the upper linear bearing is connected with the upper chuck, the lower linear bearing is connected with the lower chuck, and the upper chuck and the lower chuck are coaxial; the upper clamping head and the lower clamping head are used for clamping the impregnated yarn sample, and the plurality of fastening bolts are used for limiting the clamping and holding of the impregnated yarn sample so that the impregnated yarn sample is coaxial with the upper clamping head and the lower clamping head;
The first resin protection end of the dipped yarn sample is clamped in the upper chuck, and the second resin protection end is clamped in the lower chuck; and 2 fastening bolts penetrate through the side wall of the upper chuck and fasten two adjacent side walls of the first resin protection end, and 2 fastening bolts penetrate through the side wall of the lower chuck and fasten two adjacent side walls of the second resin protection end, so that the section to be tested of the dipped yarn sample is coaxial with the upper chuck and the lower chuck.
3. The compression test fixture for a dipped yarn specimen according to claim 2 characterised in that the rigid frame has a hollow.
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| CN202110305774.5A CN113188881B (en) | 2021-03-19 | 2021-03-19 | Preparation method of impregnated yarn sample and compression test fixture thereof |
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| CN202110305774.5A CN113188881B (en) | 2021-03-19 | 2021-03-19 | Preparation method of impregnated yarn sample and compression test fixture thereof |
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| CN113188881B true CN113188881B (en) | 2024-05-14 |
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