1、AEROSPACE MATERIAL SPECIFICATION AMS3909 REV. B Issued 1985-07 Revised 2008-01 Reaffirmed 2014-08 Superseding AMS3909A Cloth, AramidIntermediate Modulus RATIONALE AMS3909B has been reaffirmed to comply with the SAE five year review policy. _ SAE Technical Standards Board Rules provide that: “This re
2、port 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 therefrom, is the sole responsibility of the user.” SAE reviews e
3、ach technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system o
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5、org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3909B 1. SCOPE 1.1 Form This specification and its supplementary detail specifications cover an intermediate modulus aramid yarn in the fo
6、rm of cloth. 1.2 Application This cloth has been used typically in construction of parachutes, but usage is not limited to such applications. 1.3 Classification The requirements specified herein and in the applicable detail specifications define each cloth by weight and breaking strength, both of wh
7、ich are shown in the titles of the detail specifications. 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
8、specific document 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. 2.1 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocke
9、n, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM E 168 General Techniques of Infrared Quantitative Analysis SAE INTERNATIONAL AMS3909B Page 2 of 8 2.2 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelp
10、hia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/. FED-STD-191 Textile Test Methods 2.3 ASQ Publications Available from American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203, Tel: 800-248-1946 (North America) or +1-414-272-8575 (International), ww
11、w.asq.org. ANSI/ASQZ 21.4 Sampling Procedures and Tables for Inspection by Attributes 2.4 Federal Trade Commission Publications Available from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W., Washington, DC 20580, Tel: 202-326-2222 or www.ftc.gov. Textile Fiber Products Identification Ac
12、t, Rules and Regulations 3. TECHNICAL REQUIREMENTS 3.1 Detail Specifications Requirements for a specific cloth shall consist of requirements specified herein in addition to requirements specified in the applicable detail specification. In case of conflict between requirements of this specification a
13、nd an applicable detail specification, requirements of the detail specification shall govern. 3.2 Material Cloth shall be woven from an intermediate modulus para-aramid yarn (See 8.3) as shown in Table 1. Yarn shall not carbonize at a temperature lower than 780 F (416 C) determined in accordance wit
14、h FED-STD-191, Method 1534. Attenuated total reflectance infrared analysis methods in accordance with ASTM E 168 shall be used to identify the material. TABLE 1 - INITIAL YARN MODULUS Yarn Size Denier Initial Modulus gms/denier 10% 200 400 1000 1500 3000 740 670 605 565 545 3.3 Properties Shall conf
15、orm to requirements specified in the applicable detail specifications. Tests shall be performed on the cloth supplied and in accordance with specified test methods. 3.4 Quality Cloth, as received by purchaser, shall be clean, evenly woven, and free from foreign materials and from imperfections detri
16、mental to usage of the cloth. SAE INTERNATIONAL AMS3909B Page 3 of 8 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The manufacturer of the cloth shall supply all samples and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and
17、 to perform any confirmatory testing deemed necessary to ensure that the cloth conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Requirements shown in Table 2 are acceptance tests and shall be performed on each lot. TABLE 2 - ACCEPTANCE TESTS Requirement Paragrap
18、h Reference Material Identification Weight Breaking Strength Quality 3.2 See Detail SpecificationSee Detail Specification3.4 4.2.2 Preproduction Tests All technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of cloth by the manufacturer, when a ch
19、ange 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: 4.3.1 For Acceptance Tests Sufficient cloth shall be taken at random from each lot to perform all required tests. The num
20、ber of determinations for each requirement shall be as specified in the applicable test procedure or, if not specified therein, not less than three. 4.3.1.1 A lot shall be all cloth of a single weight and breaking strength produced in a single production run under the same fixed conditions and prese
21、nted for manufacturers inspection at one time. 4.3.1.2 The sample unit shall be 4 yards (3.7 m), full width, of the finished cloth. The sample size shall be as shown in Table 3. Lot size shall be expressed in units of 1 yard (0.9 m). The lot shall be unacceptable if one or more sample units fail to
22、meet any specified requirement. TABLE 3 - CLOTH SAMPLING Lot Size Yards Lot Size Meters Sample Size Up to 800, incl Over 800 to 22, 000, incl Over 22, 000 Up to 732, incl Over 732 to 20,117, incl Over 20, 117 2 3 5 SAE INTERNATIONAL AMS3909B Page 4 of 8 4.3.1.3 Yard-by-Yard (Meter-by-Meter) Examinat
23、ion A sufficient number of rolls shall be selected from a lot so that the required sample length will be obtained by inspecting approximately 25 consecutive yards (23 m) out of each sample roll. The required length of each piece shall be examined on both sides and visual defects classified as listed
24、 in Table 4. All defects found shall be counted regardless of their proximityto one another except where two or more defects represent a single local condition of the cloth, in which case, only the more serious defect shall be counted. A continuous defect shall be counted as one defect for each warp
25、-wise yard (0.9 m) or fraction thereof in which it occurs. The lot size for this examination shall be 1 linear yard (0.9 linear m). The sample sizshall be in accordance with ANSI/ASQZ 21.4, Level 3. The maximum level of defects per 100 yards (0.9 m) shall be 2.5 for major defects and 10.0 for total
26、defects. The term “clearly noticeable” as referenced in Table 4 shall be interpreted to mean visible at normal inspection distance of approximately 3 feet (914 mm). TABLE 4 - CLASSIFICATION OF DEFECTS Defect Description Major Minor Abrasion marks Any abrasion mark showing fuzziness. X Biased filling
27、 Over 2 inches (51 mm) from horizontal at the greatest point of bias. X Bowed filling Over 2 inches (51 mm) in height, measured from a straight line chord to the highest point of arc. X Break, cut, hole, or tear (other than pinhole, etc) Three or more warp or filling threads ruptured at adjoining po
28、ints. X Filling bar variations Over 0.125 inch (3.18 mm) and 0.5 inch (13 mm) and under in width with 10% or less variation above normal pick count. X Over 0.125 inch (3.18 mm) and 0.5 inch (13 mm) and under in width with more than 10% variation below normal pick count. X Over 0.5 inch (13 mm) in wi
29、dth with more than 10% variation from normal pick count. X 0.125 inch (3.18 mm) and under in width and varying 10% or more from normal pick count. X Floats or skips Any multiple float 3/16 inch (4.8 mm) square or over. X Single floats 1/4 inch (6.4 mm) or over in length. X Contiguous pin floats, the
30、 sequence of which measures 1 inch (25 mm) or over in length. X Multiple floats under 3/16 inch (4.8 mm) square. X Single floats under 0.25 inch (6.4 mm) in length. X Contiguous floats or pin floats, the sequence of which measures under 1 inch (25 mm) in length (See 8.2). X Jerked-in filling Any jer
31、ked-in filling occurring more than four times within 10 linear inches (254 linear mm). X Loops, kinks, or snarls (except selvage) All over 0.125 inch (3.18 mm) in length. X Three, or more, in any 1 linear yard (0.9 linear m); 0.125 inch (3.18 mm) and under in length. X Up to 2 inches (51 mm) in any
32、1 linear yard (0.9 linear m); 0.125 inch (3.18 mm) and under in length. X Mispick Three, or more, picks in a shed. X Double or 2 picks. X Missing end Two or more contiguous regardless of length: Single 36 inches (914 mm) and over in length. X Single under 36 inches (914 mm) in length. X Missing pick
33、 Two or more contiguous regardless of length. X One missing pick, full width. X Continuous stringy or loopy selvage projecting under 0.125 inch (3.18 mm). X SAE INTERNATIONAL AMS3909B Page 5 of 8 TABLE 4 - CLASSIFICATION OF DEFECTS (CONT.) Defect Description Major Minor Selvage defects Any cut, brok
34、en, torn, scalloped, or clearly noted waviness along the selvage edge (check for waviness under no tension). X Over 3 inches (76 mm) of continuous stringy or loopy selvage projecting 0.125 inch (3.18 mm) or over. X Any clearly noticeable roll of edge or edges when the tension is released (tight selv
35、age). X Slubs, strip-back, etc Any abruptly thickened place in the fabric caused by extraneous material woven in the fabric or a strip-back continuing over 1.5 inches (38 mm) in length and being more than 1/16 inch (1.6 mm) wide for that length. X Slubs 1.5 inches (38 mm) and under in length or 1/16
36、 inch (1.6 mm) and under in width. X Smash Any smash. X Weave Pattern other than specified. X Weavers stain Any spot, stain, or streak (not dye streaks) of the following magnitudes: Single ends or picks 15 inches (381 mm) or over in length. X Double ends or picks 8 inches (203 mm) or over in length.
37、 X More than two ends or picks 5 inches (127 mm) or over in length or a clearly noticeable area over 0.25 inch (6.4 mm) in area, whichever is greater. X Single ends or picks 2.5 to 15 inches (64 to 381 mm) in length. X Double ends or picks 2.5 to 8 inches (64 to 203 mm) in length. X Over two ends or
38、 picks under 5 inches (127 mm) in length or a clearly noticeable area 0.25 square inch (161 mm2) or under in area, whichever is greater. X Width Less than the specified width. X Wrong draw Clearly noticeable warpwise streak over 18 inches (457 mm) in length. X Yarn deformations (Types 1 and 2) Over
39、six yarn deformations or shifts of 1/32 inch (0.8 mm) or more over 6 inches (152 mm) in length occurring within an area equal to a 6 inch (152 mm) diameter circle. X 3 to 6 yard (2.7 to 5.5 m) deformations of 1/32 inch (0.8 mm) or more over 6 inches (152 mm) in length occurring within an area equal
40、to a 6 inch (152 mm) diameter circle. X 4.3.1.4 Overall Examination The unit of cloth for overall examination shall be one piece. Each piece shall be examined for the following defects. If any one piece contains any of the defects, the lot represented shall be rejected. Objectionable odor Uncleanlin
41、ess throughout Uneven weaving throughout Not labeled in accordance with Textile Fiber Products Identification Act 4.3.1.5 Examination for Length 4.3.1.5.1 Individual Rolls Any roll length found to be less than specified, or more than 2 yards (1.8 m) below the length marked on the ticket, shall be co
42、nsidered a defect with respect to length. The lot shall be unacceptable if two or more rolls in the sample are defective with respect to length. SAE INTERNATIONAL AMS3909B Page 6 of 8 4.3.1.5.2 Total Length The lot shall be unacceptable if the total of the actual lengths of the roll examined is less
43、 than the total of the lengths marked on the ticket. 4.3.1.6 A statistical sampling plan, acceptable to purchaser, may be used in lieu of sampling as in 4.3.1. 4.3.2 For Preproduction Tests Acceptable to purchaser. 4.4 Approval 4.4.1 Sample cloth shall be approved by purchaser before cloth for produ
44、ction 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. 4.4.2 Manufacturer shall use the same ingredients and processing procedures as was used for the preproduction cloth. If any change
45、s are required the manufacturer shall submit a statement of the proposed changes, and, if requested, a sample cloth using proposed changes. No production cloth shall be shipped before the changes are approved. 4.5 Test Methods Shall be in accordance with the following; manufacturers certificate of c
46、ompliance is acceptable for material, denier, and twist. 4.5.1 Air Permeability The test specimen shall be 7 inches (178 mm) long and full width of the cloth. Individual readings shall be equally spaced across the width (between selvages) of the test specimen, except that no readings shall be taken
47、within an area from the selvage equal to 10% of the specimen width. 4.5.1.1 The air permeability of the test specimen shall be the arithmetic mean of five individual readings. 4.6 Reports 4.6.1 The supplier of cloth shall furnish with each shipment a report from the manufacturer showing the results
48、of tests to determine conformance to the acceptance tests and stating that the cloth conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS 3909B and the applicable detail specification number and revision letter, manufacturers identificati
49、on, weight, and quantity. 4.6.2 The supplier of finished or semi-finished parts shall furnish with each shipment a report from the manufacturer showing the purchase order number, AMS 3909B and the applicable detail specification number and revision letter, contractor or other direct supplier of cloth, manufacturers identification, part number, and quantity. When cloth for making parts is produced or purchased by the parts
