1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and enginee ring sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, 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 invit es your written comments and suggestions.Copyright 1997 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.
3、S.A.QUESTIONS REGARDING THIS DOCUMENT: (412) 772-7154 FAX: (412) 776-0243TO PLACE A DOCUMENT ORDER: (412) 776-4970 FAX: (412) 776-0790400 Commonwealth Drive, Warrendale, PA 15096-0001AEROS PACE MATERIAL SPECIFIC ATIONSubmitted for recognition as an American National StandardAMS 3831AIssued JAN 1984R
4、evised OCT 1992Reaffirmed OCT 1997Superseding AMS 3831Cloth, Type “E” Glass, “B” Stage Epoxy-Resin-Impregnated7781 Style Fabric, Flame Resistant, Improved Strength1. SCOPE:1.1 Form: This specification covers a glass cloth impregnated with a heat-curable epoxy resin system, the resin being processed
5、to a “B” stage condition, and furnished in the form of continuous rolls.1.2 Application: This cloth has been used typically for vacuum-bag molded, flame-resistant laminates for service up to 82 C (180 F), but usage is not limited to such applications.1.3 Safety - Hazardous Materials: While the mater
6、ials, methods, applications, and processes described or referenced in this specification may 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 pr
7、oper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.2. APPLICABLE DOCUMENTS:The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall a
8、pply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order.2.1 SAE Publications:Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2825 Material Safety Data SheetsAMS 3824 Cloth, Type “E” Glass, Finished for Resin LaminatesC
9、opyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3831A SAE AMS 3831A- 2 -2.2 ASTM Publications:Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM D 638 Tensile Properti
10、es of PlasticsASTM D 638M Tensile Properties of Plastics (Metric)ASTM D 695 Compressive Properties of Rigid PlasticsASTM D 695M Compressive Properties of Rigid Plastics (Metric)ASTM D 790 Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials ASTM D 790M Flex
11、ural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials (Metric)ASTM D 2344 Apparent Interlaminar Shear Strength of Parallel Fiber Composites by Short Beam MethodASTM D 3529 Resin Solids Content of Carbon Fiber-Epoxy PrepregASTM D 3530 Volatiles Content of Carbon
12、Fiber-Epoxy PrepregASTM F 501 Aerospace Materials Response to Flame, with Vertical Test Specimen (for Aerospace Vehicles Standard Conditions)2.3 U.S. Government Publications:Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-STD-2073-1
13、 DOD Materiel, Procedures for Development and Application of Packaging Requirements3. TECHNICAL REQUIREMENTS:3.1 Material: 3.1.1 Reinforcement: Shall conform to AMS 3824, Style 7781.3.1.2 Resin: Shall be a low-pressure-laminating epoxy resin modified as necessary to meet the requirements of 3.2, 3.3
14、, and 3.4.3.2 Shelf Life: The impregnated cloth shall have a shelf life of not less than six months from date of receipt by purchaser when stored at -18 C (0 F) or below in moisture-proof, sealed containers.3.3 Working Life: The impregnated cloth shall meet the requirements of 3.4 when tested after
15、up to 20 days continuous exposure within the relative humidity and temperature limits shown in Figure 1.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3831A SAE AMS 3831A- 3 -FIGURE 1 - Working Li
16、fe Exposure Conditions3.4 Properties: Impregnated cloth shall conform to the following requirements:3.4.1 Uncured Impregnated Cloth: Shall conform to the requirements shown in Table 1; tests shall be performed on the cloth after warming to above the dew point in its sealed, moisture-proof container
17、prior to sampling and in accordance with specified test methods.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3831A SAE AMS 3831A- 4 -3.4.2 Cured Laminate: Shall conform to the requirements shown
18、 in Table 2; tests shall be performed at 25 C 3 (77 F 5) in accordance with specified test methods on specimens cut from test laminates prepared as in 4.5.1. Specimens to be tested under wet conditions shall be immersed in boiling distilled water for not less than two hours, cooled by immersion in w
19、ater at room temperature, and tested within two hours. Property values specified are the minimum average for four determinations per test; no individual value shall be less than 90% of the minimum average value specified.TABLE 1 - Uncured PropertiesParagraph Property Requirement Test Method3.4.1.1 V
20、olatiles, % by weight,maximum 2%4.5.23.4.1.2 Resin Solids Content, VolatileFree, % by weight 40 4ASTM D 35293.4.1.3 Gel Time, minutes Preproductionvalue 20%4.5.33.4.1.4 Resin Flow Preproductionvalue 20%4.5.4TABLE 2 - Cured PropertiesParagraph Property Requirement Test Method3.4.2.1 Tensile Strength:
21、DryWet73.0 ksi (503 MPa)64.0 ksi (441 MPa)ASTM D 638 orASTM D 638M3.4.2.2 Compressive Strength:DryWet60.0 ksi (414 MPa)50.0 ksi (345 MPa)ASTM D 695 orASTM D 695M3.4.2.3 Compressive Modulus:DryWet3.45 ksi (238 GPa)3.45 ksi (238 GPa)ASTM D 695 orASTM D 695M3.4.2.4 Flexural Strength:DryWet87.0 ksi (600
22、 MPa)75.0 ksi (517 MPa)ASTM D 790 orASTM D 790MCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3831A SAE AMS 3831A- 5 -3.3 Quality: Cloth, as received by purchaser, shall be uniform in quality and
23、condition, and free from foreign materials and from imperfections detrimental to usage of the cloth.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 performing all required tests. Purchaser
24、 reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the cloth conforms to the requirements of this specification.3.4.2.5 Flexural Modulus:DryWet3.3 Msi (228 GPa)3.0 Msi (207 GPa)ASTM D 790 orASTM D 790M3.4.2.6 Interlaminar Shear Strength:DryWet3.4 ks
25、i (23 MPa)3.4 ksi (23 MPa)ASTM D 23443.4.2.7 Flame Resistance (See 8.3):3.4.2.7.1 Vertical Test, 60 Seconds Ignition:Time to Extinguish afterFlame Removal, maximumBurn Length, maximumDrip Flaming Time, maximumAverage Individual5.0 seconds 6.0 seconds6.0 inches 7.2 inches(152 mm) (183 mm)3.0 seconds
26、3.6 secondsASTM F 5013.4.2.7.2 Penetration Flame Test:Time to Extinguish after Flame Removal, maximumTime of Afterglow, maximumPenetration (complete) ofLaminateAverage Individual15 seconds 18 seconds10 seconds 12 secondsNone None4.5.5TABLE 2 - Cured Properties (Continued)Paragraph Property Requireme
27、nt Test MethodCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3831A SAE AMS 3831A- 6 -4.2 Classification of Tests: 4.2.1 Acceptance Tests: Tests for properties of uncured impregnated cloth (Table 1
28、) and for tensile strength (3.4.2.1), flexural strength (3.4.2.4), interlaminar shear strength (3.4.2.6), and flame resistance (3.4.2.7.1 and 3.4.2.7.2) of cured laminates are acceptance tests and shall be performed on each lot.4.2.2 Preproduction Tests: Tests for all technical requirements are prep
29、roduction tests and shall be performed prior to or on the initial shipment of cloth to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required.4.2.2.1 For direct U.S. Military procurement, substantiatin
30、g test data and, when requested, preproduction test material shall be submitted to the cognizant agency as directed by the procuring activity, contracting officer, or request for procurement.4.3 Sampling and Testing: Shall be as follows:4.3.1 For Acceptance Tests: Cloth shall be sampled at random ac
31、cording to the following schedule:Volatiles: Each rollResin Solids: Each rollGel Time: Each rollResin Flow: Each rollTensile Strength: Lot basisFlexural Strength: Lot basisInterlaminar Shear Strength: Lot basisFlame Resistance: Lot basis4.3.1.1 Each roll of cloth offered for acceptance shall not exc
32、eed 250 yards (229 m) in length.4.3.1.2 A lot shall be all cloth treated at one time without change in treater settings using a single batch of resin and reinforcement and presented for vendors inspection at one time. An inspection lot shall not exceed 2000 yards (1829 m).4.3.1.3 From the test lamin
33、ates prepared as in 4.5.1, four specimens shall be taken, with the length of each specimen parallel to the warp, for each requirement for properties of the cured product. 4.3.1.4 When a statistical sampling plan has been agreed upon by purchaser and vendor, sampling shall be in accordance with such
34、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 vendor.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license
35、 from IHS-,-AMS 3831A SAE AMS 3831A- 7 -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.4.4.2
36、 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production cloth which are essentially the same as those used on the approved sample cloth. If necessary to make any change in ingredients, in type of equipment for processing, or in manufacturing proced
37、ures, vendor shall submit for reapproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample cloth. Production cloth made by the revised procedure shall not be shipped prior to receipt of reapproval.4.5 Test Methods: 4.5.1 Preparation of Test Laminates: A
38、ll test laminates shall be layed up with the warp parallel and unnested so that the satin shafts of the warp always face the top of the layup and shall be cured in accordance with resin manufacturers recommendation. Laminates from which tensile specimens are cut shall be composed of eight plies and
39、shall be not less than 14 inches (356 mm) in the warp direction . Laminates from which test specimens for compressive strength, compressive modulus, flexural strength, flexural modulus, and shear strength are cut shall be composed of twelve plies and shall be not less than 12 inches (305 mm) square.
40、 Laminates from which test specimens for flame resistance are cut shall be composed of two plies and shall be not less than 12 inches (305 mm) square.4.5.2 Volatile Content: Shall be determined in accordance with ASTM D 3530 at Temperature A, 120 C (248 F).4.5.3 Gel Time: Cut sufficient 2-inch (51-m
41、m) square pieces across the roll width to make a sample approximately 0.020 inch (0.51 mm) thick. Place the sample between sheets of suitable film and insert between the platens of a press which has been stabilized at 120 C 5 (248 F 9). Apply sufficient pressure to form a bead of resin around the sa
42、mple. Timing shall begin as soon as pressure is applied. The resin bead shall be probed at intervals with a wire. Gelling will be preceded by the appearance, during probing, of long strands of resin. Probing shall be continued until these long strands of resin no longer occur; the elapsed time shall
43、 be recorded as gel time.4.5.4 Resin Flow: Shall be determined in accordance with ASTM D 3531 using a platen press preheated to 120 C 3 (248 F 5) and a pressure of 15 psi 1 (103 kPa 7), holding at heat and pressure for 15 minutes 5.4.5.5 Penetration Flame Test: Specimens shall be supported at 45 deg
44、rees to horizontal by clamping in a metal frame such that an area 8-inch (203-mm) square is exposed. A 3/8 inch (9.5 mm) diameter Bunsen or Tirrill burner shall rest upon a horizontal surface. The burner shall be adjusted for no air intake, giving a yellow-tipped, 1-1/2 inch (38 mm) high flame which
45、 shall be applied to the center of the specimen for 30 seconds with one-third of the flame in contact with the specimen. Report the time to extinguish and the time to stop glowing after removal of the flame for each specimen.Copyright SAE International Provided by IHS under license with SAENot for R
46、esaleNo reproduction or networking permitted without license from IHS-,-AMS 3831A SAE AMS 3831A- 8 -4.6 Reports: The vendor of cloth shall furnish with each shipment a report showing the results of tests to determine conformance to the acceptance test requirements and stating that the cloth conforms
47、 to the other technical requirements. This report shall include the purchase order number, lot number, AMS 3831A, vendors material designation, values to be reported, width, and quantity.4.6.1 A material safety data sheet conforming to AMS 2825, or equivalent, shall be supplied to each purchaser pri
48、or to, or concurrent with, the report of preproduction test results or, if preproduction testing be waived by purchaser, concurrent with the first shipment of cloth for production use. Each request for modification of cloth formulation shall be accompanied by a revised data sheet for the proposed fo
49、rmulation.4.7 Resampling and Retesting: If any specimen used in the above tests fails to meet the specified requirements, disposition of the cloth may be based on the results of testing three additional specimens, cut from the same panel or newly-prepared panel, for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the cloth r
