1、AEROSPACE MATERIAL SPECIFICATIONAMS3689 REV. BIssued 1974-03Revised 1988-10Reaffirmed 2014-08Superseding AMS3689AAdhesive, Foaming, Honeycomb, Core Splice, Structural-54 to +177 C (-65 to +350 F)RATIONALEAMS3689B has been reaffirmed to comply with the SAE five year review policy._SAE Technical Stand
2、ards 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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole res
3、ponsibility of the user.”SAE reviews each 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 InternationalAll rights reserved. No part of this publication may be reprod
4、uced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (outside USA)Fax: 724-77
5、6-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS3689B1 SCOP(1.1 Form: This specification covers a foaming-type, heat-curing, resin-baseadhesive in the form of
6、 paste or sheet.1.2 Application: Primarily for use in splicing aluminum alloy or nonmetallichoneycomb core and for providing a shear tie between core edges and insertsor edge members in honeycomb assemblies for use over the range-54 to+177C (-65 to +350F). It is useful for filling gaps between coref
7、aces which are inserted into channels or similar areas where bondingpressure cannot be obtained.Safety - Hazardous Materials: While the materials, methods, applicationsand processes described or referenced in this specification may involve theuse of hazardous materials, this specification does not a
8、ddress the hazardswhich may be involved in such use. It is the sole responsibility of theuser to ensure familiarity with the safe and proper use of any hazardousmaterials and to take necessary precautionary measures to ensure the healthand safety of all personnel involved.2 APPLICABLE DOCUMENT The f
9、ollowing publications form a part of thisspecification to the extent specified herein.Material Specifications shall apply.The latest issue of Aerospaceshall be as specified in AMS 2350.The applicable issue of other documents2.1 SAE Publications: Available fromSAE, 400 Commonwelth Drive, Warrendale,P
10、A 15096.1.32.1.1 Aerospace Material Specifications:AMS 2350 - Standards and Test MethodsAMS 2825 - Material Safety Data SheetsAMS 4037 - Aluminum Alloy Sheet and Plate, 4.4Cu - 1.5Mg - 0.60Mn Plate), Solution Heat Treated(2024 - T3 Flat Sheet, -T351AMS 4348 - Honeycomb Core, Aluminum Alloy, Corrosio
11、n Inhibited, forSandwich Construction, 5052, 350 (175)SAE INTERNATIONAL AMS3689B Page 2 of 112.2 U.S.Government Publications: Available from Commanding Officer, NavalPublications and Forms Center, 5801 TaborAvenue, Philadelphia, PA 19120.2.2.1 Military Specifications:MIL-C-7438 - Core Material, Alum
12、inum, for Sandwich ConstructionMIL-A-25463 - Adhesive, Film Form, Metallic Structural SandwichConstruction2.2.2 Military Standards:MIL-STD-794 Parts and Equipment, Procedures for Packaging and Packing of3. TECHNICALTECHNICAL REQU3.1 Material: The adhesive shall be a heat-curing, nominally 177C (350F
13、), resin system containing fillers and foaming agents necessary to meet therequirements of 3.2 and 3.3. The adhesive shall have low sagging propertiesto ensure complete filling of core splice gaps when splices are cured in avertical position. Adhesive shall be suitable for splicing honeycomb corewit
14、hout damage to core node bonds located adjacent to the splice.3.1.1 Sheet Adhesive: Shall be supplied as an unsupported sheet with a suitablenonadhering separator film on both surfaces.3.1.2 Paste Adhesive: Shall be supplied as a thixotropic paste,single-component or two-part system, suitable for ex
15、trusion from adisposable cartridge or caulking gun.3.2 Properties of Uncured Adhesive: Adhesive, as received, shall conform to thefollowing requirements; tests shall be performed on the adhesive suppliedand in accordance with test procedures specified herein:3.2.1 Storage Life:3.2.1.1 Single compone
16、nt adhesive, packaged as specified herein, shall meet therequirements of 3.3 after storage at a maximum temperature of-18C (0F) for up to 3 months from date of receipt from manufacturer,3.2.1.2 Two-part paste systems, packaged as specified herein, shall meet therequirements of 3.3 after storage at a
17、 maximum temperature of32C (90F) for up to one year from date of receipt from manufacturer.3.2.2 Working Life:Single-component adhesive, and two-part paste systems mixedin accordance with manufacturers instructions, shall meet therequirements of 3.3 for any time up to 48 hours after exposure to arel
18、ative humidity of 50 - 70% and a temperature of 21 - 27C (70 - 80F); paste adhesive shall remain extrudable for this time period.SAE INTERNATIONAL AMS3689B Page 3 of 113.3 Properties of Cured Adhesive: Shall be as follows, determined on specimensprepared as in 4.5 and cured at 177C 5 (350F 10) for 6
19、0 min. 5using a heat-up rate of 2 - 3C (3 - 5F) per minute.3.3.1 Curing Properties:3.3.1.1 Sagging, maximum 0.05 in. (1.3 mm) 4.5.13.3.1.2 Expansion Ratio, minimum 1.7 4.5.2 or4.5.33.3.1.3 Peak ExothermTemperature, maximum 232C (450F)3.3.2 Cured Properties:Strength, minimumAt -54C (-65F)At +24C (+ 7
20、5 F)At +177C (+350 F) 40 lb per cu ft (641 Kg/m3)720 psi (4.95 MPa) 720 psi (4.95 MPa)468 psi (3.25 MPa)4.5.53.4 Quality: Adhesive, as received by purchaser, shall be uniform in qualityand condition, smooth, homogeneous, and free from foreign materials and fromimperfections detrimental to usage of t
21、he adhesive.3.5 Tolerances of Sheet Adhesive: Thickness shall be as specified, 0.010 inch(0.25 mm). Width and length shall be 12 x 24 in. (305 x 610 mm) or asspecified, 0.250 inch (6.35 mm), -0.125 inch (3.18 mm). Width and lengthof specially slit foam shall be as specified, 0.030 inch 0.76 mm). QUA
22、LITY ASSURAN4. PROVISIONS:4.1 Responsibility for Inspection: The vendor of adhesive shall supply allsamples for vendors tests and shall be responsible for performing allrequired tests.required by 4.6.Results of such tests shall be reported to the purchaser asPurchaser reserves the right to sample an
23、d to perform anyconfirmatory testing deemed necessary to ensure that the adhesive conformsto the requirements of this specification.4.2 Classification of Tests:4.2.1 Acceptance Tests:Tests to determine conformance to requirements forexpansion ratio (3.3.1.2) and beam shear strength at 24C (75F) (3.3
24、.2.2)are classified as acceptance tests and shall be performed to representeach lot.4.5.43.3.2.1 Density, maximum3.3.2.2 Beam ShearSAE INTERNATIONAL AMS3689B Page 4 of 114.2.2 Preproduction Tests: Tests to determine conformance to all technicalreapproval as in 4.4.2, and when purchaser deems confirm
25、atory testing tobe required.4.2.2.1 For direct U.S. Military procurement, substantiating test data, and,when requested, preproduction test material shall be submitted to thecognizant agency as directed by the procuring activity, contractingofficer, or request for procurement.4.3 Sampling: Shall be a
26、s follows:4.3.1 For Acceptance Tests: Sufficient adhesive shall be taken at random fromeach lot to perform all required tests. The number of determinations foreach requirement shall be as specified in the applicable test procedureor, if not specified therein, not less than three.4.3.1.1 A lot shall
27、be all adhesive produced in a single production run from thesame batches of raw materials and presented for vendors inspection atone time. An inspection lot shall not exceed 500 lb (227 kg) and may bepackaged in smaller quantities and delivered under the basic lotapproval provided lot identification
28、 is maintained.4.3.1.2 When a statistical sampling plan and acceptance quality level (AQL) havebeen agreed upon by purchaser and vendor, sampling shall be inaccordance with such plan in lieu of sampling as in 4.3.1 and the reportof 4.6.1 shall state that such plan was used.For Preproduction Tests: A
29、s agreed upon by purchaser and vendor. Onlyone panel need be tested for peak exotherm temperature (3.3.1.3).4.4 Approval:4.4.1 Sample adhesive shall be approved by purchaser before adhesive forproduction use is supplied, unless such approval be waived by purchaser.Results of tests on production adhe
30、sive shall be essentially equivalent tothose on the approved sample.4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, andmethods of inspection on production adhesive which are essentially thesame as those used on the approved sample adhesive. If necessary to makeany change in
31、ingredients, in type of equipment for processing, or inmanufacturing procedures, vendor shall submit for reapproval a statementof the proposed changes in material, processing, or both and, whenrequested, sample adhesive. Production adhesive made by the revisedprocedure shall not be shipped prior to
32、receipt of reapproval.4.3.2requirements of this specification are classified as preproduction testsand shall be performed prior to or on the initial shipment of adhesives toa purchaser, when a change in material, processing, or both requiresSAE INTERNATIONAL AMS3689B Page 5 of 114.5 Test Methods:4.5
33、.1 Sagging: The sagging characteristics of an adhesive shall be determinedby fabricating a beam shear specimen in accordance with 4.5.6.1, with noface bonding adhesive between the upper facing and the core and using a0.020 in. (0.51 mm) thick upper facing. After curing as in 3.3, removethe upper fac
34、ing, observe the degree of fill of the splice, and measure4.5.2 Expansion Ratio for Sheet Adhesives:4.5.2.1 Cut three 2 x 2 inches (51 x 51 mm) pieces of sheet adhesive and measurethe thickness of each piece at each corner and at the center to thenearest 0.01 inch (0.25 mm).Place the specimens separ
35、ately on a caul plate which has been coveredwith a suitable parting agent to prevent adhesion of the test pieces tothe plate.4.5.2.3 Place the caul plate with the specimens in a circulating-air oven whichis at a temperature not higher than 27C (80F) and raise thetemperature to 177C 5 (350F 10) at a
36、rate of 2 - 3C (3 - 5F) perminute. Maintain the specimens at 177C 5 (350F 10) for 60 min. 5 and cool to room temperature.4.5.2.4 Measure the thickness of each specimen at each quadrant to the nearest0.01 inch (0.25 mm) and calculate the expansion ratio as follows:Expansion Ratio =Average thickness o
37、f each specimen after cureAverage original thickness of the specimen4.5.3 Expansion Ratio for Paste Adhesives:4.5.3.1Clamp a sheet of 0.100 inch (2.54 mm) thick aluminum alloy having a2.0 inches (51 mm) diameter hole in the center to a caul plate. Allmetal surfaces, including the inside edges of the
38、 hole, shall be coveredwith a suitable parting agent to prevent adhesion of the test specimento the tool.4.5.3.2 Extrude sufficient paste adhesive to fill the hole in the sheet. Usinga knife blade or suitable scraper, wipe across the hole to fair theadhesive flush with the upper surface of the sheet
39、.4.5.3.3 Place the caul plate with the specimens in a circulating-air oven whichis at a temperature not higher than 27C (80F) and raise thetemperature to 177C 5 (350F 10) at a rate of 2 - 3C (3 - 5F) perminute. Maintain the specimens at 177C 5 (350F 10) for 60 min. 5and cool to room temperature.4.5.
40、2.2the sag of the splice adhesive from the upper face of the core. Evidenceof adherence of foam adhesive on the upper face over the entire splicearea will also constitute evidence of acceptable sagging characteristics.SAE INTERNATIONAL AMS3689B Page 6 of 114.5.3.4 Measure the thickness of each speci
41、men at each quadrant to the nearest0.01 inch (0.25 mm) and calculate the expansion ratio as follows:Expansion Ratio =Average thickness in in. (mm) of each specimen after cure0.10 in. (2.5 mm)4.5.4 Peak Exotherm Temperature:Shall be determined on a test panel consistingof two 0.020 x 12.0 x 12.0 inch
42、es (0.51 x 305 x 305 mm) aluminum alloyfaces and a 2.00-inches (51-mm) thick, 3/16-in. (4.8-mm) cell sizenonmetallic core as shown in Fig. 1. The core shall be spliced in thecenter of the panel. A suitable thermocouple shall be inserted in theapproximate geometric center of the splice. The panel sha
43、ll be cured asspecified in 3.3. The maximum temperature of the thermocouple during cureof the test panel shall be reported.4.5.5 Density of Cured Adhesive:4.5.5.1 Measure the width and length or the diameter of the cured specimens usedin the expansion ratio determinations (4.5.3) to the nearest 0.01
44、 in.(0.25 mm).4.5.5.2 Weigh each specimen to the nearest milligram.4.5.5.3 Using the average thickness of each specimen obtained during theexpansion ratio determination, calculate the density of the curedadhesive as follows:Density, lb/cu ft =x 3.81Density, kg/m3 =Volume, cm3 Shear4.5.6 Beam 4.5.6 B
45、eam4.5.6.1 Specimen Preparation: Test panels shall be prepared using 0.125 inch(3.18 mm) thick AMS 4037, or equivalent, aluminum alloy sheet facingsand 0.625 inch (15.88 mm) thick7.9-1/4-40 (5052) T aluminum alloyhoneycomb core conforming to AMS 4348 or to MIL-C-7438. Butting of coresections and spl
46、ice locations shall be as shown in Figure 2. Testpanels shall be bonded using a face-to-core adhesive conforming toMIL-A-25463, Type III, suitable for curing at 177C (350F). Testpanels shall be cured in accordance with 3.3 using a pressure of 50 psi 5 (345 kPa 34).Weight, gVolume, cu in.Weight, gx 1
47、0004.5.6.2 Beam shear testing shall be conducted as specified in MIL-C-7438 forflexural shear. Tests shall be conducted at the temperature specifiedin 3.3.2.2 within 1C (+2F) after not less than 10 min. at the testtemperature as verified by a thermocouple attached to the specimen inthe splice materi
48、al.SAE INTERNATIONAL AMS3689B Page 7 of 114.6 Reports:4.6.1 The vendor of adhesive shall furnish with each shipment a report showingthe results of tests to determine conformance to the acceptance testrequirements and stating that the adhesive conforms to the other technicalrequirements of this speci
49、fication. The report shall include the purchaseorder number, AMS 3689B vendors material designation, lot number, dateof manufacture, form, and quantity. For two-part paste adhesives, itshall also include the manufacturers recommended time and temperaturestorage conditions.4.6.1.1 A material safety data sheet conforming to AMS 2825, or equivalent,shall
