1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication ma
3、y be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside US
4、A) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3801CAEROSPACEMATERIALSPECIFICATIONAMS3801 REV. C Issued 1984-04 Reaffirmed 2004-07 Revised
5、2011-06 Superseding AMS3801B Cloth, Parachute - Meta-Aramid, Low Modulus RATIONALEThis document is being reviewed and revised so that future Reviews/Reaffimations coincide simultaneously with the relevant detail specifications (slash sheets - AMS3801/1, AMS3801/2, etc.). 1. SCOPE 1.1 Form This speci
6、fication covers a low modulus meta-aramid in the form of cloth. 1.2 Application These products have been typically used in the construction of parachutes, but usage is not limited to such applications. 1.3 Classification Low modulus meta-aramid parachute cloth shall be as specified in the applicable
7、 detail specification, classified by weight and weave. An example is shown in 8.2. The cloth covered by each detail specification appears as part of the title. 1.4 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may
8、 involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure t
9、he health and safety of all personnel involved. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific d
10、ocument issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted w
11、ithout license from IHS-,-,-SAE AMS3801C Page 2 of 9 2.1 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D 737 Standard Test Method for Air Permeability of Textile Fabrics ASTM D 1388 St
12、andard Test Method for Stiffness of Fabrics ASTM D 1777 Standard Test Method for Measuring Thickness of Textile Materials ASTM D 2261 Standard Test Method for Tearing Strength of Woven Fabrics by the Tongue (Single Rip) Method (Constant-Rate-of-Extension Tensile Testing Machine) ASTM D 3776 Standard
13、 Test Method for Mass per Unit Area (Weight) of Woven Fabrics 2.2 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/.FED-STD-4 Fede
14、ral Standard, Glossary of Fabric Imperfections FED-STD-191 Federal Standard, Textile Test Methods FED-STD-595 Federal Standard, Colors used in Government Procurement 2.3 Federal Trade Commission Publications Available from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W., Washington, DC 2
15、0580, Tel: 202-326-2222 or www.ftc.gov.Rules and Regulations under the Textile Fiber Products Identification Act 3. TECHNICAL REOUIREMENTS 3.1 Detail Specifications The requirements for a specific cloth shall consist of all requirements specified herein in addition to requirements specified in the a
16、pplicable detail specification. In case of conflict between requirements of this specification and an applicable detail specification, requirements of the detail specification shall govern. 3.2 Material Cloth shall be woven from low modulus meta-aramid fibers, which shall not char at a temperature l
17、ower than 671 F (355 C), determined in accordance with 4.5.1.2. The yarn shall be of the filament count, denier, twist, and color, and the weave shall be as specified in the applicable detail specification. 3.3 Properties of Yarn Shall be as specified in Table 1, determined in accordance with the fo
18、llowing test methods: TABLE 1 - YARN PROPERTIES Property Test Method Denier 4.5.1.1 Twist FED-STD-191, Method 4054Carbonization 4.5.1.2 (See 3.3.1) Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE
19、 AMS3801C Page 3 of 9 3.3.1 Carbonization The yarn manufacturers statement of conformance may be used in lieu of actual test; however, if testing is performed after weaving, the sample for test shall be obtained by unraveling the woven cloth. 3.4 Properties of Cloth Shall be as specified in Table 2,
20、 determined in accordance with the following test methods: TABLE 2 - CLOTH PROPERTIES Property Test Method Thread Count (3.4.1) FED-STD-191, Method 5050 Thickness (3.4.1) ASTM D 1777 (3.4.2) Weight (3.4.1) ASTM D 3776 Breaking Strength (3.4.1) 4.5.2.1 Elongation (3.4.1) 4.5.2.1 Tear Strength (3.4.1)
21、 ASTM D 2261 Air Permeability 4.5.2.2 Weave Visual Stiffness (3.4.3) ASTM D 1388 pH FED-STD-191, Method 2811 3.4.1 For resin treated cloth, these tests shall be performed on the cloth prior to the resin treatment. 3.4.2 A load of 6 ounces force (1.7 N) shall be applied and the presser foot diameter
22、shall be 3/8 inch (9.5 mm). 3.4.3 Applicable to resin treated cloth only. 3.5 Quality Cloth, as received by purchaser, shall be evenly woven and free from foreign materials and from imperfections detrimental to usage of the cloth. 3.5.1 Imperfections Acceptability of each lot of cloth shall be based
23、 on imperfections defined in FED-STD-4. 3.5.2 Yard-by-Yard Examination Each roll in the sample shall be examined on the face side only. When the total length in the roll does not exceed 100 yards (91 m), the entire length of the roll shall be examined. When the total length in the roll exceeds 100 y
24、ards (91 m), only 100 yards (91 m) shall be examined. All imperfections as defined in FED-STD-4, which are clearly noticeable at normal inspection distance of 1 yard (1 m) shall be scored and assigned demerit points as listed in 4.3.1.2.2. No linear yard (m), increments of 1 yard (1 m) on the measur
25、ing machine), from any one roll within the sample shall be penalized more than 4 points. The lot shall be unacceptable if the points per 100 square yards (84 m2) of the total length examined exceeds 50 points. The lot shall be unacceptable if the points per 100 square yards (84 m2) of two or more in
26、dividual rolls exceeds 60 points. If no individual roll exceeds the point level, the lot shall be acceptable with respect to this characteristic. If one roll exceeds the point level, a second sample equal in size to the first, shall be examined only for individual roll quality examination. The lot s
27、hall be unacceptable if one or more rolls in the second sample exceeds the point level. Point computation for lot quality and individual roll quality shall be as follows: 3.5.2.1 Using Inch/Pound Units Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or
28、 networking permitted without license from IHS-,-,-SAE AMS3801C Page 4 of 9 3.5.2.2 Using SI Units 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of cloth shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purc
29、haser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the cloth conforms to specified requirements. 4.2 Classification of Tests All technical requirements of this specification and the applicable detail specification are acceptance tests and prepr
30、oduction tests and shall be performed prior to or on the initial shipment of cloth to purchaser, on each lot, when a change in ingredients and/or processing requires reapproval as In 4.4.2, and when purchaser deems confirmatory testing to be required. 4.3 Sampling and Testing Shall be as follows: 4.
31、3.1 For Acceptance Tests Each lot of cloth shall be visually examined as required below for quality (3.5) and sampled at random for all other tests; the number of determinations for each requirement shall be as specified in the applicable test procedure or, if not specified therein, not less than th
32、ree. 4.3.1.1 Yarn Tests Prior to weaving the cloth, the yarn shall be sampled for tests as specified below. The lot size shall be expressed in pounds (kg) and the sample unit shall be 500 yards (457 m) of the yarn. The lot shall be unacceptable if one or more sample units fail to meet any test requi
33、rements specified. The sample size shall be as shown in Table 3: TABLE 3 - YARN TEST Lot Size Sample Size (Number of Units) Pounds Kilograms Up to 1000, inclusive Up to 454, inclusive 3 Over 1000 to 5000, inclusive Over 454 to 2268, inclusive 5 Over 5000 Over 2268 7 4.3.1.2 Yard-by-Yard Examination
34、of Cloth The unit of cloth for this examination shall be 1 square yard (1 m2). The sample size shall be in accordance with Table 4: TABLE 4 - CLOTH EXAMINATION Lot Size Sample Size (Number of Rolls) Yards Meters Up to 3200, inclusive Up to 2926, inclusive 8 Over 3200 to 10000, inclusive Over 2926 to
35、 9144, inclusive 13 Over 10 000 Over 9144 20 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3801C Page 5 of 9 4.3.1.2.1 No more than one roll shall be taken from any shipping container unless
36、 the number of shipping containers in the lot is less than the required number of rolls, in which case, all shipping containers shall be included in the sample. 4.3.1.2.2 Demerit Points Demerit points shall be assigned in the yard-by-yard examination as shown in Table 5: TABLE 5 - DEMERIT POINT ASSI
37、GNMENT Examination Results Demerit Point AssignmentImperfections up to 3 inches (76 mm), inclusive, in any dimension 1 demerit point Imperfections over 3 to 6 inches (76 to 152 mm), inclusive,in any dimension 2 demerit pointsImperfections over 6 to 9 inches (152 to 229 mm), inclusive,in any dimensio
38、n 3 demerit pointsImperfections over 9 inches (229 mm) in any dimension 4 demerit points4.3.1.2.2.1 The following imperfections, when present, shall be scored 4 points for each linear yard (linear meter) in which they occur: Color other than as specified in the applicable detail specification Baggy,
39、 ridgy, or wavy cloth Objectionable odor Width less than specified 4.3.1.3 Properties of Cloth The unit of cloth for property determination shall be not less than specified below; the sample size shall be as specified in 4.3.1.2:4.3.1.3.1 Cloth Not Containing a Resin Treatment 2 linear yards (1.8 li
40、near m), continuous piece, full width 4.3.1.3.2 Cloth Containing a Resin Treatment 1.5 linear yards (1.4 linear m), continuous piece, full width 4.3.1.4 A lot shall be all cloth of a single weight produced in a single production run under the same fixed conditions and presented for vendors inspectio
41、n at one time. 4.3.1.5 When a statistical sampling plan has been agreed upon by purchaser and vendor, sampling shall be in accordance with such plan in lieu of sampling as in 4.3.1 and the report of 4.6 shall state that such plan was used.4.3.2 For Preproduction Tests As agreed upon by purchaser and
42、 vendor. 4.4 Approval 4.4.1 Sample cloth shall be approved by purchaser before cloth for production use is supplied, unless such approval be waived by purchaser. Results of tests on production cloth shall be essentially equivalent to those on the approved sample. Copyright SAE International Provided
43、 by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3801C Page 6 of 9 4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production cloth which are essentially the same as those use
44、d on the approved sample cloth. If necessary to make any change in ingredients, in type of equipment for processing, or in manufacturing procedures, vendor shall submit for reapproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample cloth. Production c
45、loth made by the revised procedure shall not be shipped prior to receipt of reapproval. 4.5 Test Methods 4.5.1 Yarn Tests 4.5.1.1 Denier Shall be determined as follows: 4.5.1.1.1 Measure a 900-mm length of yarn to the nearest millimeter. 4.5.1.1.2 Weigh the yarn sample in grams to the nearest 10 mil
46、ligrams. 4.5.1.1.3 Calculate the denier (weight per length) as follows: Denier = wt in grams of 9000 m = wt of 900-mm sample x 10 000 4.5.1.2 Carbonization Shall be determined in accordance with FED-STD-191, Method 1534, and as follows: 4.5.1.2.1 Apparatus A suitable melting point apparatus shall be
47、 used to determine the carbonization point of the yarn. 4.5.1.2.2 Procedure A sufficient number of fibers shall be removed from the yarn sample for observation of carbonization. The temperature at which the yarn begins to stiffen or char shall be considered the end point of the test. 4.5.2 Cloth Tes
48、ts 4.5.2.1 Breaking Strength Shall be determined in accordance with FED-STD-191, Method 5104, for cloth without resin coating and Method 5100 for resin treated cloth. The test specimens for both unaged and oven aged determinations shall be prepared so that the warp direction specimens contain the same warp yarns and the filling specimens contain the same filling yarns. Acceptance shall be based on the average of five specimens from each sample. 4.5.2.1.1 Breaking Strength After Aging The specimen size shall be the same as in the unaged breaking strength determination. The specimens
