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1、BRITISH STANDARD AEROSPACE SERIES BS PL 9:2005 Fibrous polyamide material for use as an explosion suppressant and as a baffle material in aircraft fuel tanks Test methods ICS 49.025.40; 83.120 ? Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:06:54 GMT+00:00
2、2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 10 June 2005 BSI 10 June 2005 The following BSI references relate to the work on this standard: Committee reference ACE/65 Draft for comment 04/3011
3、5936 DC ISBN 0 580 45904 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/65, Inspection and testing requirements for non-metallic materials, upon which the following bodies were represented: British Hydromechanics R
4、esearch Group British Plastics Federation Society of British Aerospace Companies Ltd. Co-opted members The following bodies were also represented in the drafting of this standard, through panel ACE/65/-/64, Structural reinforced plastic: Defence Science and Technology Laboratory Co-opted members Ame
5、ndments issued since publication Amd. No.DateText affected Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:06:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 BSI 10 June 2005 i Contents Page Committees responsibleInside front cover Forewordii 1Scop
6、e 1 2Normative references 1 3Test variations 1 4Extraction of test specimens 1 5Physical tests on fibres 1 6Mechanical tests on fibres 3 7Test report 4 Annex A (normative) Extraction of test specimens 5 Figure A.1 Standard cutting plan for test specimen 5 Licensed Copy: London South Bank University,
7、 London South Bank University, Sat Dec 09 03:06:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 ii BSI 10 June 2005 Foreword This British Standard has been prepared under the direction of ACE/65/-/64. With BS PL 8, this document supersedes DTD 5627, April 1982, which was declared obsolesc
8、ent by the Ministry of Defence from 1st April 1999. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to
9、health and safety at any stage. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary o
10、f pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 0
11、3:06:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 BSI 10 June 2005 1 1 Scope This British Standard describes the methods for testing fibrous polyamide material, to show conformance with the requirements of BS PL 8. 2 Normative references The following referenced documents are indispens
12、able for the application of this document. For dated references, only the reference cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 4735, Laboratory method of test for assessment of the horizontal burning characteristics of
13、specimens no larger than 150 mm 50 mm 13 mm (nominal) of cellular plastics and cellular rubber materials when subjected to a small flame. BS ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification. BS PL 8, Fibrous polyamide mate
14、rial for use as an explosion suppressant and as a baffle material in aircraft fuel tanks Specification. 3 Test variations With agreement of the purchaser, other equivalent test methods may be used. However, in case of dispute, the test methods described in this standard shall be used. 4 Extraction o
15、f test specimens Test specimens shall be extracted from sheet(s) submitted for test in accordance with Annex A. Each specimen extracted shall be identified with the section letter and test specimen number as shown in Figure A.1. 5 Physical tests on fibres 5.1 Determination of density and density gra
16、dient Select specimens A, B, C and D as shown in Figure A.1 of approximate size 240 480 60 mm. Measure the mass of each specimen to the nearest 0.1 g and record: specimen A as m1; specimen B as m2; specimen C as m3; and specimen D as m4. Determine the density of the specimen as dspecimen (in g/l): D
17、etermine the density gradient as dgradient: 5.2 Determination of sheet density Measure the weight of the sheet to the nearest 0.1 g and record as m1. Determine density of the sheet as dsheet (in g/l): dspecimen m1m2m3m4+ 27.7 - -= dgradient m2m4+ m1m3+ -= dsheet m1 27.7 - -= Licensed Copy: London So
18、uth Bank University, London South Bank University, Sat Dec 09 03:06:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 2 BSI 10 June 2005 5.3 Determination of fibre diameter Select specimen 10 as shown in Figure A.1 of approximate size 100 40 60 mm. Extract three sections (100 12 60 mm) from
19、 the central region of the specimen and mount them on microscope slides using a suitable mounting material. Using a microscope fitted with a suitable measuring device, measure the diameter of the fibre at the comparatively straight region between bonds to an accuracy of 0.5 m. Make twenty measuremen
20、ts and state the average as the fibre diameter. 5.4 Determination of extractable contaminants Select specimen 16 as shown in Figure A.1 of approximate size 25 25 60 mm. Reduce the thickness of the specimen to 50 mm and condition the specimen by drying it for a minimum period of four hours at 70 C. W
21、eigh the specimen to the nearest 0.1 mg and record as m1. Extract contaminants from the sample using a 60 ml Soxhlet thimble and appropriate apparatus. Use test liquid consisting of a 70:30 (by volume) mixture of iso-octane and toluene. Extract for a minimum period of three hours under continuous re
22、flux. After extraction, dry the specimen for a minimum of four hours at 70 C and allow it to cool in a desiccator. Reweigh the specimen to the nearest 0.1 mg and record as m2. Determine the mass of extractable contaminants as mextract and express it as a percentage of the original mass: 5.5 Determin
23、ation of fuel retention From a sheet of material, cut four specimens 150 150 120 mm symmetrically from the centre of the sheet, with the edges of the specimens parallel to the sides of the sheet. Carry out the test on pairs of specimens, with diagonal pairing (i.e. A with D, and B with C). Measure t
24、he size and mass (m1) of the specimen to the nearest 0.5 mm and 0.1 g respectively. Place two specimens one on top of the other centrally in a fuel tank of approximate dimensions 180 180 350 mm, ensuring the specimens do not touch the sides of the fuel tank. Add aviation fuel, appropriate for which
25、the product has been designed, to the fuel tank, immersing the specimens. When air bubbles have stopped emerging from the specimens, drain the fuel from the tank at a rate of (500 50) ml/min. When the flow rate fall to less than five drops per minute, remove the top specimen and reweigh as m2. Rever
26、se the specimens by placing the bottom specimen on the top and repeat the procedure. Test all the other pairs of specimens. Calculate the percent fuel retention fr of the specimens from: where V is the volume of specimen P is the density of fuel D is the density of specimen. Report the mean of the f
27、our specimens as the percent fuel retention fr normalized to 8.5 g/l density material. mextract 100 m1m2() m1 - -= fr100 m1m2 VP - - 8.5 D - - = Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:06:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 BSI
28、10 June 2005 3 5.6 Determination of flammability Select specimen 15 as shown in Figure A.1 of approximate size 380 240 60 mm. Reduce the area of the specimen to 250 150 60 mm by removing parallel strips 130 mm and 90 mm from the uncut 240 mm and 380 mm edges respectively. Reduce the thickness of the
29、 specimen by cutting a slice 13 mm thick measured from the top lower density surface. Subdivide the specimen into five strips of approximate size 50 150 13 mm. Test them in accordance with BS 4735. 6 Mechanical tests on fibres 6.1 Determination of grab strength Select specimens 5, 6, 16, 17 as shown
30、 in Figure A.1 of approximate size 200 120 60 mm. Mark a central section 25 mm wide in the 200 mm direction. Use a test machine conforming to BS ISO 5893 and fitted with rubber faced clamps 25 mm wide and 50 mm long. Insert the specimens with the 200 mm direction in the direction of separation, alig
31、ning the 25 mm wide strip with the clamp edges, giving a test length of approximately 100 mm. Using a crosshead speed of 200 mm/min, continue separation of the clamps until rupture of the specimen occurs. Record the maximum force attained for each specimen and record the mean of the tests results as
32、 the grab strength of the material. 6.2 Determination of compression force, loss of compression force and compression set Select specimens 3, 4, 8, 9, 13, 14, 18 and 19 as shown in Figure A.1 of approximate size 100 100 60 mm. Pair specimens: 3 with 14; 4 with 13; 8 with 21; and 9 and 20. Place pair
33、ed specimens on top of each other with their highest density surfaces uppermost, forming a block of nominal height 120 mm. Measure the true height of the combined specimens to the nearest 0.5 mm (h1). Using a test machine conforming to BS ISO 5893, compress the specimen to 50 % of its measured heigh
34、t. Carry out five compressive cycles on the specimen using a compression speed of 100 mm/min. Record the maximum compressive force (in newtons) on the first compression cycle and the fifth compression cycle as l1 and l2 respectively. On completion of the five cycles, allow the specimen to recover fo
35、r 60 to 65 min under no load prior to measuring the height to the nearest 0.5 mm (h2). Report the mean value of the maximum compression force from the first compression cycle for each specimen pair as the compression force. Calculate the percent loss (lpercent loss) in compression force for each spe
36、cimen pair as: Report the mean value of the percent loss in compression force from each specimen pair as the percent loss in compression force. lpercent loss 100 l1l2() l1 - -= Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:06:54 GMT+00:00 2006, Uncontrolled
37、 Copy, (c) BSI BS PL 9:2005 4 BSI 10 June 2005 Calculate the compression set (hpercent) for each specimen pair as: Report the mean value of the compression set from each specimen pair as the compression set of the material. 7 Test report A test report shall be prepared, specifying the following for
38、each test condition: a) the number and date of this standard, i.e. BS PL 7:2005; b) the batch number; c) fabric type and style; d) the individual test results and the mean result; e) conformance or failure against requirements specified in BS PL 8; f) any deviations from the test method as agreed wi
39、th the purchaser. hpercent 100 h1h2() h1 - -= Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:06:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 BSI 10 June 2005 5 Annex A (normative) Extraction of test specimens On a standard sheet of material, ma
40、rk the fibre direction on the lower density surface and mark one end of the sheet with letters A, B, C and D and arrows pointing to the lower density surface as shown in Figure A.1. Using a band knife, cut the sheet in half along the main fibre direction. The next cut shall be in the main plane of e
41、ach half, one 60 mm from the top or lower density surface, the other 60 mm from the bottom surface, as shown in Figure A.1. Cutting to an accuracy of 1 mm, extract specimens from each section as shown in Figure A.1. From section A, cut specimens from the marked end. From section B, cut specimens fro
42、m the unmarked end. From section C, cut specimens from the central area. From section D, cut specimens from the marked and unmarked ends. Figure A.1 Standard cutting plan for test specimen 240240 8 1213 15 1 2 5611 192021 348910 7 18 14 1617 480 2 1 AC BD 60 60 ACBD 100100100100 200120 100100 100100
43、100100 100100 200120 200100 200120200120 100100 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:06:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS PL 9:2005 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent nat
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