CN109580477A - A kind of automatic placement splices the detection method of intensity with prepreg - Google Patents
A kind of automatic placement splices the detection method of intensity with prepreg Download PDFInfo
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- CN109580477A CN109580477A CN201811356854.8A CN201811356854A CN109580477A CN 109580477 A CN109580477 A CN 109580477A CN 201811356854 A CN201811356854 A CN 201811356854A CN 109580477 A CN109580477 A CN 109580477A
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- Prior art keywords
- preimpregnation
- preimpregnation tow
- prepreg
- splicing
- tow
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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
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
Abstract
The present invention relates to a kind of automatic placement detection methods of prepreg splicing intensity, belong to prepreg automatic placement molding technical field.The present invention has been put forward for the first time the detection method of preimpregnation tow spelling joint intensity for the demand in automatic placement molding technology to overlength preimpregnation tow.The present invention passes through the stress condition in analysis preimpregnation tow spelling joint practical application, use the horizontal drawing breakdown strength that stitching portion is measured under tension tester, use the stripping damage intensity of peeling tester measurement stitching portion, splicing intensity of the two obtained intensive parameters respectively as prepreg under straightened condition and bending state.By the quantization signifying of two different angles as a result, the present invention can react the preimpregnation tow spelling joint intensity in actual application comprehensively.
Description
Technical field
The present invention relates to a kind of automatic placement with prepreg splice intensity detection method, belong to prepreg automatic placement at
Type technical field.
Background technique
Polymer matrix composites have many advantages, such as that high specific strength and specific modulus, antifatigue, designability is strong, is widely used in
The fields such as aerospace, rail traffic, new energy, health care and sports equipment.Using polymer matrix composites as representative
Advanced composite material is since its excellent performance is having been more and more widely used, and the automated manufacturing skill of composite material
Art also becomes always the emphasis of industry development, most important one technology since the manufacturing cost of composite material can be greatly reduced
It is exactly the automatic placement molding technology of prepreg.Material used in automatic placement molding technology is prepreg, is with resin base
Body impregnating continuous fibres or fabric under conditions of strict control, are made the composition of resin matrix and reinforcement, are that manufacture is multiple
The intermediate materials of condensation material.It is needed prepreg paving in use according to designed direction and the number of plies in corresponding mould
On tool, the operations such as cure under pressure are then carried out again and obtain the composite element of given configuration and size.The automatic paving of prepreg
Forming technique is put due to having the characteristics that high quality, high-precision and high reliability, has obtained the height of educational circles and industrial circle in recent years
Degree is paid attention to and is greatly developed.
Prepreg automatic placement molding technology (including automated tape-laying molding and automatic fiber placement molding) is with narrower width
Unidirectional prepreg tape or tow be raw material, spread using equipment such as the conveying of automation, pavings in specific shape die surface
It puts.The advantages that high quality, high-precision, high reliability and high efficiency, makes prepreg automatic placement molding technology in aerospace field
In be more and more widely used.For the laying efficiency for improving automatic placement molding technology, preparation length is often required
In 1000 meters or more of overlength prepreg tape and tow, to reduce the waiting time shut down and reloaded.Prepreg tape and preimpregnation tow at present
Main preparation methods be for wide cut prepreg carry out slitting treatment, it is a plurality of narrow that the prepreg of 1m or the above breadth, which are cut,
The prepreg tape or preimpregnation tow of width.But it is constrained to equipment capacity and operation complexity, the width of industry preparation at present
Width prepreg is difficult the length for accomplishing that automatic placement equipment is suitble to need.Therefore, it is needed in actual production to a plurality of shorter
Prepreg tape or preimpregnation tow carry out splicing, to meet automatic placement molding technology to the need of overlength prepreg tape and preimpregnation tow
It wants.
The transmission process of prepreg tape and preimpregnation tow in automatic placement equipment to carry biggish tension and need through
The variation control that multiple groups fixed pulley carries out the conveyance tension of conveying direction sum is crossed, the spelling joint of prepreg is not only in this process
By the stretching action for being parallel to material, in knee also by the destruction of peeling force (see Fig. 1), it is therefore desirable to spelling joint
All have certain intensity to guarantee not will disconnect under two kinds of operating conditions.The intensity of the spelling joint of prepreg is depended in splicing ring
The surface bonding force of prepreg under border, at present industry there are no systematic quantification characterization this performance parameter of prepreg method,
Rely solely on prepreg surface viscosity size (HB 7736.8) qualitatively to differentiate the intensity size limitation of spelling joint compared with
Greatly, it is difficult to embody the spelling joint intensity under practical application operating condition.
Summary of the invention
Fail abundant quantitatively characterizing to solve the problems, such as that prepreg existing in the prior art splices intensity, the present invention proposes
A kind of detection method of the splicing intensity of automatic placement prepreg.The technical solution of the invention is as follows,
1) prepared by horizontal drawing sample: two preimpregnation tows are horizontally arranged, the left end of a preimpregnation tow is pre- with another
The right end for soaking tow is overlapped certain length up and down and carries out pre-glued, and the major axes orientation of two preimpregnation tow bonding regions should be with preimpregnation
Carbon fiber direction is identical in tow, and bonding region is then put into mechanical hot pressing platform and carries out hot pressing splicing, preimpregnation tow and heat
It is isolated between flattening bench using release materials, temperature, pressure and the time of the splicing of preimpregnation tow sample heat and actual production
Technological parameter used by used preimpregnation tow is spliced in the process is consistent；
2) prepared by peel test specimen: the identical preimpregnation tow both ends of two length being aligned, to the overlapping region of wherein one end
Pre-glued is carried out, the major axes orientation of preimpregnation tow bonding region should be identical as carbon fiber direction in preimpregnation tow, then will bonding
Region is put into mechanical hot pressing platform and carries out hot pressing splicing, is isolated between preimpregnation tow and hot pressing platform using release materials,
Technological parameter used by temperature, pressure and the time of heat splicing splice with overlength preimpregnation tow is consistent；
3) splicing strength test sample obtained in step 1 and 2 performance test: is used into tension tester and removing respectively
Strength tester is tested, test environment temperature it is consistent with prepreg actual application environment temperature, load loading speed and
The practical laying rate of prepreg is consistent, and the horizontal drawing breakdown strength and stripping damage for the preimpregnation tow sample that final test obtains are strong
Degree splices strength quantifies characterization result as prepreg.
The width of the preimpregnation tow sample is corresponding with the width of preimpregnation tow.
The preimpregnation tow sample refers in such a way that overlapped up and down to glue two preimpregnation tows by surface tack
The sample of one.
The isolated material used between the preimpregnation tow and hot pressing platform is polytetrafluoroethylene (PTFE), PE film, PP film or polyester
Film.
Distance of the fixture clamping ends apart from nearest preimpregnation tow sample bond end is 50-150mm.
The present invention has the advantage that and beneficial effect
The present invention has been put forward for the first time preimpregnation tow spelling for the demand in automatic placement molding technology to overlength preimpregnation tow
The detection method of strength of joint.The present invention uses pulling force by the stress condition in analysis preimpregnation tow spelling joint practical application
The horizontal drawing breakdown strength that stitching portion is measured under tester is obtained using the stripping damage intensity of peeling tester measurement stitching portion
Splicing intensity of two intensive parameters respectively as prepreg under straightened condition and bending state.Pass through two different angles
Quantization signifying as a result, the present invention can react the preimpregnation tow spelling joint intensity in actual application comprehensively.
The detection method of the splicing intensity of automatic placement proposed by the present invention prepreg has the advantage that
(1) targetedly quantitatively characterizing is carried out to the splicing intensity of automatic placement preimpregnation tow, preimpregnation tow is spliced
Head strength degree carries out exact evaluation；
(2) test method is simple and reliable, has reacted preimpregnation tow by two parametric synthesis of tensile strength and peel strength
The intensity that spelling joint is destroyed and is bent under stripping damage both of which in planar stretch；
(3) actual use situation can be simulated by changing temperature, pressure and time in sample preparation and test process,
Guarantee the accuracy and directiveness of test result.
Detailed description of the invention
Fig. 1 is the glassbreak schematic diagram that prepreg spelling joint occurs in the prior art；
Fig. 2 is the shape and size schematic diagram of horizontal drawing sample of the present invention；Wherein b is the top view of a；1 in figure --- clamping
Region；2 --- bonding region；
Fig. 3 is the shape and size schematic diagram of peel test specimen of the present invention, and wherein b is the top view of a；1 in figure --- clamping
Region；2 --- bonding region.
Specific embodiment
Combined with specific embodiments below to a kind of detection method of the splicing intensity of automatic placement prepreg of the invention
It is further elaborated, but protection content of the invention is not limited to following embodiment.
The detection method of the splicing intensity of automatic placement proposed by the present invention prepreg mainly comprises the steps that
1) horizontal drawing sample prepare: by two preimpregnation tows in the way of Fig. 2 and size first manually carry out pre-glued, two
The length of the bonding plane of preimpregnation tow is 20-60mm, and major axes orientation should be identical as carbon fiber direction in preimpregnation tow.Then it will glue
It connects region and is put into the progress hot pressing splicing of mechanical hot pressing platform, polytetrafluoroethylene (PTFE) demoulding portion is used between preimpregnation tow and hot pressing platform
It is isolated.Technological parameter used by temperature, pressure and the time of heat splicing splice with overlength preimpregnation tow is consistent.
2) peel test specimen prepare: by two preimpregnation tows in the way of Fig. 3 and size first manually carry out pre-glued, two
The length of the bonding plane of preimpregnation tow is 20-60mm, and major axes orientation should be identical as carbon fiber direction in preimpregnation tow.Then it will glue
It connects region and is put into the progress hot pressing splicing of mechanical hot pressing platform, polytetrafluoroethylene (PTFE) demoulding portion is used between preimpregnation tow and hot pressing platform
It is isolated.Technological parameter used by temperature, pressure and the time of heat splicing splice with overlength preimpregnation tow is consistent.
3) splicing strength test sample obtained in step 1 and 2 performance test: is used into tension tester and removing respectively
Strength tester is tested.Distance of the fixture clamping ends apart from nearest bond end is 50-150mm, tests environment temperature
, load loading speed consistent with prepreg actual application environment temperature and the practical laying rate of prepreg are consistent.It is final to survey
The horizontal drawing breakdown strength and stripping damage intensity for trying obtained preimpregnation tow sample are as prepreg splicing strength quantifies characterization knot
Fruit.
Specific application mode is shown in following embodiment.
Embodiment 1
Two preimpregnation tows are first carried out pre-glued and tried at horizontal drawing sample and removing in the way of Fig. 2 and Fig. 3 with size
The length of sample, the bonding plane of two preimpregnation tows is 40mm, and major axes orientation should be identical as carbon fiber direction in preimpregnation tow.Then
Bonding region 2 is put into mechanical hot pressing platform and carries out hot pressing splicing, polytetrafluoroethylene (PTFE) is used between preimpregnation tow and hot pressing platform
Release cloth is isolated.The temperature of splicing is 30 DEG C, and pressure is in 0.2MPa, time 3min.The splicing strength test that will be obtained
Sample is tested using tension tester and peel strength tester respectively, and 1 end of fixture clamping zone distance is nearest to take
The distance for connecing end is 50mm, and test environment temperature is 15 DEG C, and load loading speed is 0.1m/min.Test result shows prepreg
The horizontal drawing breakdown strength for splicing strength specimen is 202.4N, and stripping damage intensity is 5.48N.
Embodiment 2
Two preimpregnation tows are first carried out pre-bonding manually and be connected into horizontal drawing sample and stripping in the way of Fig. 2 and Fig. 3 with size
From sample, the length of the bonding plane of two preimpregnation tows is 25mm, and major axes orientation should be identical as carbon fiber direction in preimpregnation tow.
Then by bonding region 2 be put into mechanical hot pressing platform carry out hot pressing splicing, between preimpregnation tow and hot pressing platform using PE film into
Row isolation.The temperature of splicing is 45 DEG C, and pressure is in 0.3MPa, time 1min.Obtained splicing strength test sample is distinguished
Tested using tension tester and peel strength tester, fixture clamping zone 1 end apart from nearest bond end away from
It is 5 DEG C from environment temperature for 90mm, is tested, load loading speed is 4m/min.Test result shows prepreg splicing intensity examination
The horizontal drawing breakdown strength of sample is 168.4N, and stripping damage intensity is 2.35N.
Embodiment 3
Two preimpregnation tows are first carried out pre-bonding manually and be connected into horizontal drawing sample and stripping in the way of Fig. 2 and Fig. 3 with size
From sample, the length of the bonding plane of two preimpregnation tows is 55mm, and major axes orientation should be identical as carbon fiber direction in preimpregnation tow.
Then by bonding region 2 be put into mechanical hot pressing platform carry out hot pressing splicing, between preimpregnation tow and hot pressing platform using PP film into
Row isolation.The temperature of splicing is 55 DEG C, and pressure is in 0.4MPa, time 5min.Obtained splicing strength test sample is distinguished
Tested using tension tester and peel strength tester, fixture clamping zone 1 end apart from nearest bond end away from
It is 20 DEG C from environment temperature for 120mm, is tested, load loading speed is 15m/min.Test result shows that prepreg splices intensity
The horizontal drawing breakdown strength of sample is 295.6N, and stripping damage intensity is 4.68N.
Embodiment 4
By two preimpregnation tows in the way of Fig. 2 and Fig. 3 and size first carries out pre-glued manually, two preimpregnation tows
The length of bonding plane is 40mm, and major axes orientation should be identical as carbon fiber direction in preimpregnation tow.Then bonding region is put into machine
Tool hot pressing platform carries out hot pressing splicing, is isolated between preimpregnation tow and hot pressing platform using polyester film.The temperature of splicing
It is 25 DEG C, pressure is in 0.6MPa, time 5min.Obtained splicing strength test sample is used into tension tester and stripping respectively
It is tested from strength tester, distance of the fixture clamping ends apart from nearest bond end is 150mm, and test environment temperature is
18 DEG C, load loading speed is 20m/min.Test result shows that the horizontal drawing breakdown strength of prepreg splicing strength specimen is
185.3N, stripping damage intensity are 2.89N.
Claims (5)
1. a kind of detection method of the splicing intensity of automatic placement prepreg, which is characterized in that
1) prepared by horizontal drawing sample: two preimpregnation tows being horizontally arranged, by the left end of a preimpregnation tow and another preimpregnation silk
The right end of beam is overlapped certain length up and down and carries out pre-glued, and the major axes orientation of two preimpregnation tow bonding regions should be with preimpregnation tow
Middle carbon fiber direction is identical, and bonding region is then put into mechanical hot pressing platform and carries out hot pressing splicing, preimpregnation tow and thermal crushing
It is isolated between platform using release materials, temperature, pressure and the time of the splicing of preimpregnation tow sample heat and actual production process
Used in preimpregnation tow splice used by technological parameter it is consistent；
2) prepared by peel test specimen: the identical preimpregnation tow both ends of two length being aligned, are carried out to the overlapping region of wherein one end
The major axes orientation of pre-glued, preimpregnation tow bonding region should be identical as carbon fiber direction in preimpregnation tow, then by bonding region
It is put into mechanical hot pressing platform and carries out hot pressing splicing, be isolated between preimpregnation tow and hot pressing platform using release materials, heat is spelled
Technological parameter used by temperature, pressure and the time connect splices with overlength preimpregnation tow is consistent；
By step 1) and 2) 3) performance test: splicing strength test sample obtained in uses tension tester and removing strong respectively
Degree tester tested, test environment temperature it is consistent with prepreg actual application environment temperature, load loading speed in advance
Leaching expects that practical laying rate is consistent, the horizontal drawing breakdown strength and stripping damage intensity of the preimpregnation tow sample that final test obtains
Splice strength quantifies characterization result as prepreg.
2. a kind of detection method of the splicing intensity of automatic placement prepreg according to claim 1, which is characterized in that
The width of the preimpregnation tow sample is corresponding with the width of preimpregnation tow.
3. a kind of detection method of the splicing intensity of automatic placement prepreg according to claim 1, which is characterized in that
The preimpregnation tow sample refers to the examination that two preimpregnation tows stick to one in such a way that overlapped up and down by surface tack
Sample, including horizontal drawing sample and peel test specimen.
4. a kind of detection method of the splicing intensity of automatic placement prepreg according to claim 1, which is characterized in that
The isolated material used between the preimpregnation tow and hot pressing platform is polytetrafluoroethylene (PTFE), PE film, PP film or polyester film.
5. a kind of detection method of the splicing intensity of automatic placement prepreg according to claim 1, which is characterized in that
Distance of the fixture clamping ends apart from nearest preimpregnation tow sample bond end is 50-150mm.
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| CN111060033A (en) * | 2019-12-27 | 2020-04-24 | 中航复合材料有限责任公司 | Fabric prepreg bow and weft variation detection device and detection method |
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