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 1998 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.
3、S.A.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-7154 FAX: (724) 776-0243TO PLACE A DOCUMENT ORDER: (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS: http:/www.sae.org400 Commonwealth Drive, Warrendale, PA 15096-0001AEROS PACE MATERIAL SPECIFIC ATIONSubmitted for recognition as an American National
4、 StandardAMS 3811BIssued APR 1978 Revised JUL 1993Reaffirmed AUG 1998Superseding AMS 3811ARods, Aramid Fiber, Polyester Resin CoatedPultrusion1. SCOPE:1.1 Form: This specification covers coated round rods fabricated by the pultrusion process from aramid fibers and a weather-resistant polyester resin
5、 binder in the form of straight lengths or in coils.1.2 Application: These rods have been used typically for nonconductive tension elements in antenna supports where superior long-term weather resistance and extremely light weight are required, but usage is not limited to such applications.1.3 Safet
6、y - Hazardous Materials: While the materials, 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
7、 ensure familiarity with the safe and proper 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
8、 latest issue of SAE publications shall apply. 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 3901/4 Yarn, Organic Fiber, (Para-Aramid), High Mod
9、ulus, OY 390,000 (2690) Tensile Strength, 16,500,000 (115) Tensile Modulus, 1420 Denier, 0.6% FinishCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3811B SAE AMS 3811B- 2 -2.2 ASTM Publications: Av
10、ailable from ASTM, 100 Barr Harbor, West Conshohocken, PA 19428-2959.ASTM D 149 Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commerical Power FrequenciesASTM D 638 Tensile Properties of PlasticsASTM D 638M Tensile Properties of Plastics (Metric)AST
11、M D 695 Compressive Properties of Rigid PlasticsASTM D 695M Compressive Properties of Rigid Plastics (Metric)ASTM D 785 Rockwell Hardness of Plastics and Electrical Insulating MaterialsASTM D 790 Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating MaterialsASTM D 79
12、0M Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials (Metric)ASTM D 792 Specific Gravity (Relative Density) and Density of Plastics by DisplacementASTM D 2289 Tensile Properties of Plastics at High Speeds (Discontinued 1992)ASTM D 2344 Apparent Interlami
13、nar Shear Strength of Parallel Fiber Composites by Short Beam MethodASTM D 2990 Tensile, Compressive, and Flexural Creep and Creep Rupture of Plastics2.3 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-
14、STD-105 Sampling Procedures and Tables for Inspection by AttributesMIL-STD-2073-1 DOD Materiel, Procedures for Development and Application of Packaging Requirements3. TECHNICAL REQUIREMENTS: 3.1 Material: Shall be rods of circular cross section, fabricated by the pultrusion process from the necessar
15、y number of unidirectional, continuous, aramid rovings and a high-quality, weather-resistant, thermosetting polyester resin binder. The rods shall be coated for enhanced weatherability and resistance to handling damage.3.1.1 Roving: Each roving shall have a denier of not less than 14,200, formed by
16、gathering continuous-filament, aramid-fiber yarns together into approximately a parallel arrangement without twist. The yarns shall conform to AMS 3901/4 and shall be free of splices.3.1.2 Resin Binder: Shall be a high-quality, weather-resistant, thermosetting polyester resin, cross-linked with styr
17、ene. The resin formulation may contain a catalyst, a die lubricant, and additives for enhanced weather resistance, flame retardance, and anti-tracking qualities, but it shall not contain a wetting agent or a coupling agent, and shall be free of grease, oil, dirt, and other foreign matter.Copyright S
18、AE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3811B SAE AMS 3811B- 3 -3.1.3 Coating: Shall be primarily organic, but may contain inorganic ingredients. Coating shall be applied uniformly over the cylindrica
19、l surfaces of the rods to a thickness of 0.010 inch 0.005 (0.25 mm 0.13).3.1.3.1 The surfaces of coated rods shall be smooth, nonporous, and free of cracks. The coating shall not contain scratches, gouges, or other handling damage. Scuff marks and occasional blisters not exceeding one in any 5 feet
20、(1.5 m), pits, and other manufacturing imperfections will be acceptable provided that they neither penetrate to the substrate nor protrude above the surface by more than 3% of the finished rod diameter.3.1.3.2 The coating shall be flexible and adherent to the substrate, determined in accordance with
21、 4.5.1 and 4.5.2.3.2 Fabrication: 3.2.1 Roving Preparation: The roving shall be dried for not less than eight hours at 250 F 10 (121 C 6), immediately prior to impregnation, and shall be maintained in the dry condition by passing through a suitable heating chamber until immersed in the resin trough.
22、3.2.2 Pultrusion: Pultrusion of the rods shall be performed in accordance with best practices of the pultrusion industry.3.2.3 Coiling: Coiling of rods shall not be attempted until the rods have cooled to below 100 F (38 C). Coiling shall be accomplished with care to ensure that no portion of the ro
23、d is bent, even momentarily, to a radius of curvature less than one-half the coil diameter. The coil diameter shall be not less than 300 times the rod diameter, unless rods have passed the coiled storage test in accordance with 4.5.12 utilizing a smaller coil diameter.3.2.3.1 Rods furnished in strai
24、ght lengths shall not be cut from coils.3.2.4 Post Curing: When specified by purchaser, straight rods not exceeding 10 feet (3 m) in length shall be post-cured for not less than 15 hours at 275 F 10 (135 C 6). The rods shall be fully supported during post curing to avoid warping.3.3 Properties: Rods
25、 shall conform to requirements shown in Table 1; tests shall be performed on the rods supplied and in accordance with specified test methods, insofar as practicable.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license
26、 from IHS-,-AMS 3811B SAE AMS 3811B- 4 -3.4 Quality: Rods, as received by purchaser, shall be uniform in quality and condition, smooth, and free from foreign materials and from imperfections detrimental to usage of the rods.TABLE 1 - PropertiesParagraph Property Requirement Test Method3.3.1 Tensile
27、Strength, minimum 125 ksi(862 MPa)4.5.33.3.2 Stress-Rupture Strength, minimum 70.0 ksi(483 MPa)4.5.43.3.3 Flexural Strength, minimumat 68 to 86 F (20 to 30 C)at -70 F 5 (-57 C 3)95% ofProproduction Value90% ofPreproduction Value4.5.53.3.4 Vibration Fatigue StrengthAt 70.0 ksi (483 MPa)Pass 4.5.63.3.
28、5 Dielectric Strength, minimumDryWet70 volts/mil(2.76 kV/m)15 volts/mil(0.59 kV/m)4.5.73.3.6 Short Beam Shear Strength, minimum 4500 psi(31.0 MPa)4.5.83.3.7 Fiber Content PreproductionValue 3%4.5.93.3.8 Hardness, Rockwell E PreproductionValue 104.5.103.3.9 Transverse Tensile Strength PreproductionVa
29、lue 20%4.5.113.3.10 Density PreproductionValue 10%ASTM D 792Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3811B SAE AMS 3811B- 5 -3.5 Tolerances: Shall conform to the following:3.5.1 Diameter: 3%
30、 of nominal3.5.2 Length: Shall be as shown in Table 2.3.5.3 Straightness: The departure from straightness for rods furnished in straight lengths shall not exceed 0.04 inch/foot (3.3 mm/m) of length.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of rods shall supply al
31、l 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 rods conform to the requirements of this specification.4.2 Classification of Tests: 4.2.1 Accepta
32、nce Tests: Tests for material (3.1), tensile strength (3.3.1), fiber content (3.3.7), hardness (3.3.8), transverse tensile strength (3.3.9), density (3.3.10), quality (3.4), and tolerances (3.5) are acceptance tests and shall be performed on each lot.TABLE 2A - Length Tolerances, Inch/Pound UnitsNom
33、inal LengthFeetToleranceFeetUp to 10, incl +0.10, -0Over 10 to 50, incl +0.25, -0Over 50 +1.0, -0TABLE 2B - Length Tolerances, SI UnitsNominal LengthMetersToleranceMetersUp to 3, incl +0.03, -0Over 3 to 15, incl +0.08, -0Over 15 +0.3, -0Copyright SAE International Provided by IHS under license with
34、SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3811B SAE AMS 3811B- 6 -4.2.2 Periodic Tests: Tests for flexural strength (3.3.3) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purcha
35、ser.4.2.3 Preproduction Tests: Tests for all technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of rods to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing
36、 to be required except that the coiled storage test (4.5.12) is not required unless rod is to be supplied in coil diameters less than 300 times the nominal rod diameter.4.2.3.1 For direct U.S. Military procurement, substantiating test data and, when requested, preproduction test material shall be su
37、bmitted 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: Shall be in accordance with Single Sampling for Normal Inspection, General Inspection Level II, specified i
38、n MIL-STD-105 as shown in Table 3. Test specimens shall be taken from rods selected at random throughout the lot. The number 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 rod
39、produced from the same batches of ingredients, using the same processing conditions on the same machine, in not longer than 24 hours, and presented for vendors inspection at one time.4.3.1.2 An inspection unit shall be each coil or 1000 feet (305 mm) of rod, whichever is smaller, using both ends of
40、each coil.TABLE 3 - Inspection Unit SamplingNumber ofInspection Unitsin the lotNumber ofInspection Unitsfrom WhichSamples areto be TakenNumber ofNonconformingSamplestoAcceptNumber ofNonconformingSamplestoReject1 to 50 8 (4.3.1.2.1) 0 151 to 90 13 1 291 to 150 20 1 2151 to 280 32 2 3281 to 500 50 3 4
41、Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3811B SAE AMS 3811B- 7 -4.3.1.2.1 If the number of inspection units to be sampled equals or exceeds the lot size, inspect each unit.4.3.1.3 After 10
42、consecutive lots meet Table 3 requirements, inspection sampling may be reduced for the product of that machine to Special Inspection Level S-1, MIL-STD-105, wherein the Single Sample Size is 3 and the Acceptance Number is 0. Should any rejections occur, sampling shall be returned to that of Table 3
43、for at least 10 consecutive satisfactory production lots.4.3.2 For Periodic and Preproduction Tests: Shall be as agreed upon by purchaser and vendor.4.4 Approval: 4.4.1 Sample rod shall be approved by purchaser before rod for production use is supplied, unless such approval be waived by purchaser. R
44、esults of tests on production rod shall be esentially equivalent to those on the approved sample.4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production rod which are essentially the same as those used on the approved sample. If necessary to m
45、ake 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 rod. Production rod made by the revised procedure shall not be shipp
46、ed prior to receipt of reapproval.4.5 Test Methods: 4.5.1 Coating Flexibility: Shall be determined in accordance with ASTM D 2289 using a specimen of full-diameter rod having length not exceeding 50 times the rod diameter. The specimen shall be subjected to an axial tensile stress of 70.0 ksi (483 M
47、Pa) using a testing speed which attains the required tensile load in not more than one second. Any loading method which meets this requirement may be used, including high-speed testing machines and drop weights. The specimen shall be examined, using not over 10X magnification, not less than 12 hours
48、 after the load is removed. Hairline cracks in the coating in a direction transverse to the rod axis or other evidence of coating damage are not acceptable.4.5.2 Coating Adhesion: Shall be determined using a specimen of full-diameter rod. A transverse saw cut shall be made on the surface of the spec
49、imen to a depth of one-fourth to one-third of the rod diameter. Using the point of a sharp instrument, such as a penknife or surgical blade, attempt to pry off the coating at the edges of the saw cut. If a single piece of coating having a surface area greater than 1/8 inch (3.2 mm) square can be flaked off cleanly from the substrate, the rod is not acceptable.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo repro
