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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, 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 2001 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.
3、A.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-7161 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 15096-0001AEROSPACE MATERIAL SPECIFICATIONAMS 3726/2AIssued OCT 1983Revised OCT 1991Reaffirmed
4、APR 2001Superseding AMS 3726/2Shims, Filled Resin CompoundPrecatalyzed Sheet1. SCOPE:1.1 Form: This specification covers a filled, resinous, thermosetting, precatalyzed compound in the form of sheet capable of being applied and cured in place between the surfaces of mechanically fastened (joined) st
5、ructures.1.2 Application: This product has been used typically as a molded shim during assembly of aircraft components and parts, but usage is not limited to such applications. The compound covered by this detail specification requires storage in the frozen condition until just prior to installation
6、.2. APPLICABLE DOCUMENTS: See AMS 3726.3. TECHNICAL REQUIREMENTS: 3.1 Basic Specification: The complete requirements for procuring the product described herein shall consist of this document and the latest issue of the basic specification, AMS 3726.3.2 Material: Shall be a precatalyzed epoxy or modi
7、fied epoxy-base polymer supplied in sheet form. The thickness, width, and length of the sheets shall be as specified.3.2.1 Storage Life: The product shall meet the requirements of this specification at any time up to six months from date of receipt by purchaser when stored below -37 C (-35 F) in the
8、 original unopened containers.AMS 3726/2A SAE AMS 3726/2A- 2 -3.3 Cured Properties: Shall be as shown in Table 1.TABLE 1Paragraph Property Requirement Method of Testing3.3.1 Hardness, Durometer D orequivalent, minimum average 92ASTM D 22403.3.2 Specific Gravity, maximum 1.60 ASTM D 7923.3.3 Coeffici
9、ent of Linear ThermalExpansion, maximum average-62 to +93 C(-80 to +199 F)5.4 x 10-5 mm/mm per C(3.0 x 10-5 inch/inch per F)ASTM D 6963.3.4 Lap Shear Strength, minimumaverage 2000 psi (13.8 MPa)ASTM D 10023.3.5 Lap Shear Residual Strength,Exposed, minimum average3.3.5.1 Salt Spray, 30 days at50 C 1
10、(122 F 2)1500 psi(10.3 MPa)ASTM B 1173.3.5.2 Condensing Humidity, 30days at 60 C + 1 (140 F 2)1700 psi(11.7 MPa)ASTM D 11513.3.5.3 JP-4 Fuel, 7 days at60 C 1 (140 F 2)1800 psi(12.4 MPa)ASTM D 31653.3.6 Strain Compatibility, Tensile, Constant Amplitude Cycling3.3.6.1 Aluminum alloy 20 cycles without
11、failureat -55 C 1 (-67 F 2)4.5.23.3.6.2 Graphite-epoxy laminate 20 cycles without failure at -55 C 1 (-67 F 2)4.5.33.3.7 Flatwise CompressiveStrength, minimum30.0 ksi (207 MPa) stresswithout failure4.5.43.3.8 Shim-Torque Test, breakawaytorque, individual bolt, minimum50% of initial appliedtorque4.5.
12、5AMS 3726/2A SAE AMS 3726/2A- 3 -4. QUALITY ASSURANCE PROVISIONS: See AMS 3726.5. PREPARATION FOR DELIVERY: See AMS 3726 and the following:5.1 Packaging and Identification: 5.1.1 The precatalyzed sheet shall be furnished packaged so that each sheet is separated from other sheets within the same pack
13、age using a suitable material of contrasting color. 6. ACKNOWLEDGMENT: See AMS 3726.7. REJECTIONS: See AMS 3726.8. NOTES:See AMS 3726 and the following:8.1 When product is used for preproduction or acceptance testing, the thickness shall be as specified by the specific test method. The total thickness for test purposes may be obtained by stacking sheets of lesser thickness.8.2 The precatalyzed sheet shall be kept frozen at all times until immediately prior to application.8.3 Compound which has thawed shall not be refrozen.PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “P”
