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 3845BIssued JUN 1974R
4、evised OCT 1991Reaffirmed JUL 1997Superseding AMS 3845ACloth, Type “E” Glass“B” Stage Addition Cure Polyimide-Resin-Impregnated1. SCOPE:1.1 Form: This specification cover glass cloth impregnated with a heat-reactive, thermosetting, addition-cure polyimide resin system, the resin to be supplied in a
5、“B“ stage condition.1.2 Application: Primarily for laminated structural parts requiring high strength and long-term heat resistance up to 230 C (446 F) and short-term exposure up to 290 C (555 F).1.3 Safety - Hazardous Materials: While the materials, methods, applications, and processes described or
6、 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 proper use of any hazardous materials and to take necessa
7、ry precautionary measures to ensure the health and safety of all personnel involved.1.4 Classification: Shall be as follows:Class 1 - Low-Flow Addition-Cure ResinClass 2 - High-Flow Addition-Cure ResinCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or
8、networking permitted without license from IHS-,-AMS 3845B SAE AMS 3845B- 2 -2. APPLICABLE DOCUMENTS:The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the i
9、ssue 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 3619 Resin, Polyimide, Laminating, High Temperature Resistant, 315 C (600 F)AMS 3824 Cloth, Type “E” Glass, Finished for
10、 Resin Laminates2.2 ASTM Publications:Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM D 638 Tensile Properties of PlasticsASTM D 638M Tensile Properties of Plastics (Metric)ASTM D 790 Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulat
11、ing MaterialsASTM D 790M Flexural 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 2734 Void Content of Reinforced Plastics2.3 U.S. Government Public
12、ations:Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-STD-2073-1 DOD Materiel, Procedures for Development and Application of Packaging Requirements3. TECHNICAL REQUIREMENTS: 3.1 Material: 3.1.1 Reinforcement: Shall conform to AMS 3
13、824, Style 181, 1581, or 7781.3.1.2 Resin: Shall conform to AMS 3619.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3845B SAE AMS 3845B- 3 -3.1.3 Storage Life: The impregnated cloth shall have a s
14、helf life of not less than three months from date of shipment when stored or shipped in a barrier container and maintained at 4 to 15 C(39 to 59 F).3.2 Properties: 3.2.1 Uncured Impregnated Cloth: Cloth, as supplied shall conform to the following requirements; tests shall be performed in accordance
15、with specified ASTM methods, insofar as practicable. In addition, when specified, tack and drape shall be as agreed upon by purchaser and vendor.3.2.1.1 Volatile Content and Resin Solids: Volatile content shall be not greater than 10%. Devolatilized resin content shall be as specified by purchaser.3
16、.2.1.2 Gel Time: Shall be either 50 minutes 5 or 20% of the preproduction value, as agreed upon by purchaser and vendor, determined using a platen temperature of 290 C 5 (554 F 9).3.2.1.3 Wet Resin Flow: Shall be as agreed upon by purchaser and vendor, with a tolerance of 20%, determined using a pla
17、ten temperature of 290 C 5 (554 F 9).3.2.2 Cured Product: Shall be as follows, determined on laminates prepared as in 4.5.1. Properties of laminates of constructions other than as specified in 4.5.1 shall be as agreed upon by purchaser and vendor. The resin content, molding pressure, and cure cycle
18、for each panel shall be reported. Test specimens shall be held at the specified test temperature for not less than 30 minutes before testing.3.2.2.1 Tensile Strength Minimum Average: 3.2.2.2 Short Beam Shear Strength, Minimum Average: TABLE 1 - Tensile StrengthTest Temperature ksi MPa25 C 3 ( 77 F 5
19、) 45.0 310230 C 5 (446 F 9) 40.0 276290 C 5 (554 F 9) 34.0 234TABLE 2 - Short Beam ShearTest TemperatureClass 1psiClass 1MPaClass 2psiClass 2MPa25 C 3 ( 77 F 5) 5000 34.5 3300 22.8230 C 5 (446 F 9) 3500 24.1 2500 17.2Copyright SAE International Provided by IHS under license with SAENot for ResaleNo
20、reproduction or networking permitted without license from IHS-,-AMS 3845B SAE AMS 3845B- 4 -3.2.2.3 Flexural Strength Minimum Average: 3.2.2.4 Flexural Modulus Minimum Average: 3.2.2.5 Void Content: Shall be not greater than 10%.3.3 Quality: Cloth, as received by purchaser, shall be uniform in quali
21、ty and condition, smooth, and free from foreign materials and from imperfections detrimental to usage of the cloth.3.4 Tolerances: Width shall not vary more than +1/2 inch (+12.7 mm), -0 from the width ordered.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of cloth sh
22、all supply all samples for vendors tests and shall be responsible for performing all required tests. Purchaser 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.4.2 Classification of Tests
23、: 4.2.1 Acceptance Tests: Tests for uncured properties (3.2.1) and properties of the cured product at 25 C (77 F) (3.2.2) are acceptance tests and shall be performed on each lot.TABLE 3 - Flexural StrengthTest TemperatureClass 1ksiClass 1MPaClass 2psiClass 2MPa25 C 3 ( 77 F 5) 60.0 414 54,000 372290
24、 C 5 (554 F 9) 42.0 290 38,000 262TABLE 4 - Flexural ModulusTest Temperature psi MPa25 C 3 ( 77 F 5) 2.5 x 10 6 17,237290 C 5 (554 F 9) 2.0 x 10 6 13,790Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-
25、AMS 3845B SAE AMS 3845B- 5 -4.2.2 Preproduction Tests: Tests for all technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of impregnated cloth to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when
26、 purchaser deems confirmatory testing to be required.4.2.2.1 For direct U.S. Military procurement, substantiating 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 procureme
27、nt.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 permit performing all required tests. The number of determinations for each requirement shall be as specified in the applicable test procedure or, if not specified
28、therein, not less than shown in 4.3.1.1.4.3.1.1 Frequency of Sampling: Shall be according to the following schedule shown in Table 5:4.3.1.2 A roll is the basic unit and shall not exceed 250 yards (229 m) in length. It shall be the full width of the broadgoods.TABLE 5 - Frequency of SamplingRequirem
29、entMinimumNumber of Determinationsper RequirementTestProcedureResin Solids Each roll 2 4.5.2Volatile Content Each roll 1 4.5.2Gel Time Each roll 1 4.5.3Resin Flow Each roll 1 4.5.4Tensile Strength Lot basis 4 4.5.5Short Beam Shear Strength Lot basis 4 4.5.6Flexural Strength Lot basis 4 ASTM D 790or
30、ASTM D 790MFlexural Modulus Lot basis 4 ASTM D 790or ASTM D 790MVoid Content Lot basis 3 ASTM D 2734Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3845B SAE AMS 3845B- 6 -4.3.1.3 A lot shall be al
31、l cloth treated at one time without significant changes 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) and may be packaged in smaller quantities and delivered under the basic
32、 lot approval provided lot identification is maintained.4.3.1.4 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 Preproduct
33、ion Tests: As agreed upon by purchaser and 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 sa
34、mple.4.4.2 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 manufactur
35、ing procedures, 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 La
36、minates: All 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 molded under appropriate pressure and cured in accordance with resin manufacturers recommendation. Laminates from which tensile specime
37、ns are cut shall be composed of eight plies and shall be not less than 14 inches (356 mm) in the warp direction. Laminates from which specimens for all other tests are cut shall be composed of twelve plies and shall be not less than 12 inches (305 mm) square.4.5.2 Volatile Content and Resin Solids:
38、Accurately weigh to the nearest 0.01 gram (W 1 ) each of four samples 4-inches (102-mm) square cut on the bias of the product. Using porcelain crucibles previously brought to constant weight by igniting at 565 C 25 (1049 F 45), dry samples in a circulating air oven at 315 C 5 (599 F 9) for 10 minute
39、s 0.5, cool in a desiccator, and reweigh (W 2 ). Burn out resin in muffle furnace for not less than 180 minutes at 565 C 25 (1049 F 45) until fabric is white. Cool in a desiccator and reweigh. Repeat the burn out as necessary to obtain constant weight (W 3 ).(Eq.1)Volatile Content, %W1 W2()W1-x 100=
40、Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3845B SAE AMS 3845B- 7 -4.5.2 (Continued):(Eq.2)where:W 1 = original weight of sampleW 2 = weight of specimen after dryingW 3 = weight of ash4.5.3 Ge
41、l Time: Cut sufficient 2-inch (51-mm) square pieces across the roll width to make a sample approximately 0.200 inch (5.08 mm) thick. Place the sample between sheets of suitable film and insert between the platens of a press which has been stabilized at the specified temperature. Apply sufficient pre
42、ssure to form a bead of resin around the sample. 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 re
43、sin no longer occur; the elapsed time shall be recorded as gel time.4.5.4 Wet Resin Flow: Cut four 4-inch (102-mm) square pieces on the bias of the weave and weigh to the nearest 0.01 gram (W 4 ). Stack samples between separator sheets approximately 6 x 8 inches (152 x 203 mm) of aluminum foil or eq
44、uivalent. If the sample tends to stick to the separator sheets after curing, it is permissible to use a nonvolatile mold release agent. Such agents may be used only under conditions such that they do not undergo a weight loss greater than 0.005 gram during cure. Place samples and separator sheets be
45、tween press platens preheated to the temperature, taking care that the edges of all pieces remain properly aligned. Apply pressure of 15 psi 5 (103 kPa 34) on the sample and hold at heat for 5 minutes 0.5, taking care that the edges of all pieces remain properly aligned. Remove sample and cool in de
46、siccator. Remove separators and resin flash by trimming sample to original 4-inch (102-mm) square size, taking care not to remove any reinforcing fibers. Weigh sample to nearest 0.01 gram (W 5 ).(Eq.3)where:W 4 = original weight of sampleW 5 = weight of sample after trimming4.5.5 Tensile Strength: S
47、hall be determined in accordance with ASTM D 638 or ASTM D 638M, except that the specimen in Figure 1 shall be used.4.5.6 Short Beam Shear Strength: Shall be determined in accordance with ASTM D 2344, except that a flat specimen shown in Figure 2 shall be used.Resin Solids (Volatile Free), %W2 W3()W
48、2- x 100=Resin flow, %100 x W4 W5W4-=Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3845B SAE AMS 3845B- 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 to the other technical requirements. This report shall include the purchase order number, lot numb
