CN105223119B - A kind of method for airfelt permeability test - Google Patents
A kind of method for airfelt permeability test Download PDFInfo
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- CN105223119B CN105223119B CN201510677061.6A CN201510677061A CN105223119B CN 105223119 B CN105223119 B CN 105223119B CN 201510677061 A CN201510677061 A CN 201510677061A CN 105223119 B CN105223119 B CN 105223119B
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Abstract
The present invention is a kind of method for airfelt permeability test, the method of tradition evaluation airfelt gas permeability must carry out quantitative calculating using specialized instrument and equipment in laboratory conditions, and can not the authentic assessment airfelt gas permeability (under high-temperature high-pressure state) in the curing process.The present invention is utilized using the existing airfelt of enterprise as target sample7400th, the characteristic to fade in DPT1000 vacuum bag curing process using the method for qualitative comparison, devises a kind of method of evaluation airfelt gas permeability simple and effective, convenient and efficient, operability is strong.It shortens the time required to selecting novel ventilated felt, reduces selection cost, ensure that selection quality.
Description
The present invention is a kind of method for airfelt permeability test, belongs to technical field of measurement and test.
The prior art
When airfelt is composite element blank forming and hardening, gas can be discharged at operating temperature, protected
Hold the fabric of vacuum passage or fiber felt-like material.The quality of its gas permeability directly affects composite element after molding
The quality of quality.
General gas permeability index is air penetrability, according to GB/T 5453-1997 (ISO9237:1995)《Textile fabric is saturating
The measure of gas》, air penetrability can be by under defined pressure differential, measuring in certain time and giving area perpendicular through sample
Air flow rate calculating obtain.When enterprise selects new product, this method for weighing airfelt performance quality includes following skill
Art content：
1. needing preparation pertinent instruments, (round platform, fixture, rubber washer, pressure gauge or pressure gauge, air-flow are steadily inhaled as samples
Enter device (wind turbine), flowmeter, volumeter or measure aperture etc.), and measured in laboratory environment.Must put into more fund and
Test maintenance cost.General enterprises do not have more than experimental condition；
2. the pressure drop of experiment is only up to 0.5kPa, and can only measure at room temperature.And general vacuum bag/autoclave method into
During type composite material, solidifying pressure reaches as high as 0.78MPa, and temperature reaches as high as 190 DEG C.This method can not authentic assessment it is new,
Old two kinds of airfelts gas permeability (under high-temperature high-pressure state) in the curing process.
Existing test method is only capable of, in 0.5kPa, measuring airfelt permeability at room temperature.But general vacuum bag/autoclave
During method forming composite, solidifying pressure reaches as high as 0.78MPa, and temperature reaches as high as 190 DEG C.Airfelt is open structure,
Permeability is affected by pressure and temperature, and existing test method can not judge airfelt permeability under high temperature and pressure,
Composite material manufacturing enterprise cannot be met to airfelt performance requirement.
Invention content
The present invention is exactly in view of the above-mentioned deficiencies in the prior art and design provides one kind and breathes freely for airfelt
Property test method, the purpose is to using the existing airfelt of enterprise as target sample, utilize7400、DPT1000
The characteristic to fade in vacuum bag curing process using the method for qualitative comparison, devises one kind simply and effectively, convenient and efficient
, the method for the alternative airfelt gas permeability of qualitative evaluation suitable for enterprise operations.The purpose is to shorten airfelt to select week
Phase has saved selection cost, ensure that selection quality.
The purpose of the present invention is achieved through the following technical solutions：
The method that this kind is used for airfelt permeability test, it is characterised in that：The step of this method is：
Step 1: choosing two identical metal plate molds (1), the planar dimension of metal plate mold (1) is
1M*1M, one of to be used as sample test mold, another is as test sample mold, three layers of sample test mold upper berthN10 airfelts, every layer of airfelt thickness are 4~5mm, and outside spreads one layer7400 vacuum bags,
Again vacuum bag is pasted with vacuum sealant；
At another as three layers of test sample mold upper berthN10-AA airfelts, every layer of airfelt thickness
It spends for 4~5mm, one layer of outside paving7400 vacuum bags, then paste vacuum bag with vacuum sealant；
Step 2: being vacuumized to two mold skies, and vacuum degree is kept in the range of 0.08~0.10MPa, then carry out
Elevated cure, solidification temperature are 180 ± 5 DEG C, and soaking time is 180 ± 10min, and solidifying pressure is 0.6 ± 0.05MPa, is cured
And the temperature rate of cooling procedure is 1~3 DEG C/min；
Step 3: observation cures the color change of each layer of airfelt in latter two vacuum bag；
Step 4: repeating step 1 to the test process of step 3, difference is as three layers of test sample mold upper berth
WF330 airfelts, every layer of airfelt thickness are 4~5mm, and outside spreads one layer7400 vacuum bags, then use vacuum
Sealant pastes vacuum bag；
Step 5: repeating step 1 to the test process of step 3, difference is：
As three layers of sample test mold upper berthN10 airfelts, every layer of airfelt thickness for 4~
5mm, outside spreads one layer of DPT1000 vacuum bag, then pastes vacuum bag with vacuum sealant；
As four layers of test sample mold upper berth606 airfelts, every layer of airfelt thickness for 3~
4mm, outside spreads one layer of DPT1000 vacuum bag, then pastes vacuum bag with vacuum sealant.
Color change after observation curing in airfelt.Airfelt patch vacuum bag face color is vacuum bag color, if patch mould
Tool face color is vacuum bag color, then illustrates that airfelt gas permeability is excellent.Compare the existing airfelt of enterprise and novel alternative ventilative
The color change of felt, the vacuum bag color in airfelt is closer to patch die face, it was demonstrated that airfelt gas permeability is more excellent.
The advantages of technical solution of the present invention is that simple and effective, convenient and efficient, operability is strong, shorten select it is novel ventilated
The time required to felt, selection cost is reduced, ensure that selection quality.
Description of the drawings
Fig. 1 is that vacuum bag pastes structure diagram in the method for the invention
Specific embodiment
Technical solution of the present invention is further described below with reference to drawings and examples：
The method that this kind is used for airfelt permeability test, it is characterised in that：The step of this method is：
Step 1: choosing two identical metal plate molds (1), the planar dimension of metal plate mold (1) is
1M*1M, one of to be used as sample test mold, another is as test sample mold, three layers of sample test mold upper berthN10 airfelts, every layer of airfelt thickness are 4~5mm, and outside spreads one layer7400 vacuum bags,
Again vacuum bag is pasted with vacuum sealant；
At another as three layers of test sample mold upper berthN10-AA airfelts, every layer of airfelt thickness
It spends for 4~5mm, one layer of outside paving7400 vacuum bags, then paste vacuum bag with vacuum sealant；
Step 2: being vacuumized to two mold skies, and vacuum degree is kept in the range of 0.08~0.10MPa, then carry out
Elevated cure, solidification temperature are 180 ± 5 DEG C, and soaking time is 180 ± 10min, and solidifying pressure is 0.6 ± 0.05MPa, is cured
And the temperature rate of cooling procedure is 1~3 DEG C/min；
Step 3: observation cures the color change of each layer of airfelt in latter two vacuum bag；
It is light green color that N10 airfelts, which paste vacuum bag face first layer and second layer color, and third layer color is
White；N10-AA airfelts patch vacuum bag face first layer color is light green color, and the second layer and third layer color are
White.ComparisonN10 airfelts andThe color change of N10-AA airfelts,
Permeability is inferior under N10-AA airfelt high temperature and pressureN10,N10-AA airfelt performances
It is unsatisfactory for enterprise requirements.
Step 4: repeating step 1 to the test process of step 3, difference is as three layers of test sample mold upper berth
WF330 airfelts, every layer of airfelt thickness are 4~5mm, and outside spreads one layer7400 vacuum bags, then use vacuum
Sealant pastes vacuum bag；
Color change after observation curing in airfelt,N10 and WF330 airfelts patch vacuum bag face the
One layer is light green color with second layer color, and third layer color is white.To the color change of the two airfelt, airfelt high temperature is high
Pressure permeability is similar, and WF330 airfelt performances meet enterprise requirements.
Step 5: repeating step 1 to the test process of step 3, difference is：
As three layers of sample test mold upper berthN10 airfelts, every layer of airfelt thickness for 4~
5mm, outside spreads one layer of DPT1000 vacuum bag, then pastes vacuum bag with vacuum sealant；
As four layers of test sample mold upper berth606 airfelts, every layer of airfelt thickness for 3~
4mm, outside spreads one layer of DPT1000 vacuum bag, then pastes vacuum bag with vacuum sealant；
Color change after observation curing in airfelt.N10 airfelts paste vacuum bag face first layer and the
Two layers of color are light orange, and third layer color is white；606 four layers of airfelt color are light orange.It is right
ThanN10 airfelts andThe color change of 606 airfelts,606 thoroughly
Permeability is better than under gas felt high temperature and pressureN10,606 airfelt performances are unsatisfactory for looking forward to
Industry requirement.
Claims (1)
- A kind of 1. method for airfelt permeability test, it is characterised in that：The step of this method is：Step 1: choosing two identical metal plate molds (1), the planar dimension of metal plate mold (1) is 1M* 1M, one of to be used as sample test mold, another is as test sample mold, three layers of sample test mold upper berthN10 airfelts, every layer of airfelt thickness are 4~5mm, and outside spreads one layer7400 vacuum Bag, then paste vacuum bag with vacuum sealant；At another as three layers of test sample mold upper berthN10-AA airfelts, every layer of airfelt thickness are 4 ~5mm, outside spread one layer7400 vacuum bags, then paste vacuum bag with vacuum sealant；Step 2: being vacuumized to two mold skies, and vacuum degree is kept then to heat up in the range of 0.08~0.10MPa Curing, solidification temperature are 180 ± 5 DEG C, and soaking time is 180 ± 10min, and solidifying pressure is 0.6 ± 0.05MPa, is cured and cold But the temperature rate of process is 1~3 DEG C/min；Step 3: observation cures the color change of each layer of airfelt in latter two vacuum bag；Step 4: repeating step 1 to the test process of step 3, difference is as three layers of test sample mold upper berth WF330 Airfelt, every layer of airfelt thickness are 4~5mm, and outside spreads one layer7400 vacuum bags, then use vacuum sealant Paste vacuum bag；Step 5: repeating step 1 to the test process of step 3, difference is：As three layers of sample test mold upper berthN10 airfelts, every layer of airfelt thickness are 4~5mm, outside Face spreads one layer of DPT1000 vacuum bag, then pastes vacuum bag with vacuum sealant；As four layers of test sample mold upper berth606 airfelts, every layer of airfelt thickness are 3~4mm, Outside spreads one layer of DPT1000 vacuum bag, then pastes vacuum bag with vacuum sealant.
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| CN109540405B (en) * | 2018-11-07 | 2021-02-02 | 昌河飞机工业（集团）有限责任公司 | Air leakage testing method for composite material forming die |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183444A (en) * | 2011-01-27 | 2011-09-14 | 中国商用飞机有限责任公司 | Device and method for testing gas permeability in inner direction of paving layer surface |
| CN104897541A (en) * | 2015-05-07 | 2015-09-09 | 中南大学 | Combined type multifunctional fiber fabric in-plane permeability integrated test device |
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| US7779685B2 (en) * | 2007-06-27 | 2010-08-24 | Andrew Kallmes | Fluid transportation by a sheet of material |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183444A (en) * | 2011-01-27 | 2011-09-14 | 中国商用飞机有限责任公司 | Device and method for testing gas permeability in inner direction of paving layer surface |
| CN104897541A (en) * | 2015-05-07 | 2015-09-09 | 中南大学 | Combined type multifunctional fiber fabric in-plane permeability integrated test device |
Non-Patent Citations (1)
| Title |
|---|
| 纺织品透气性测试;张建祥等;《印染》;20091201(第23期);38-40 * |
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