1、AEROSPACE MATERIAL SPECIFICATIONAMS3710 REV. CIssued 1961-07Revised 1993-07Reaffirmed 2014-08Superseding AMS3710BSandwich Structures, Glass Fabric-ResingLow Pressure Molded, Heat ResistantRATIONALEAMS3710C has been reaffirmed to comply with the SAE five year review policy._SAE Technical Standards Bo
2、ard 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 responsibi
3、lity 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 reproduced, s
4、tored 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: 724-776-0790E
5、mail: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS3710C1. SCOPE:1.1 Form:This specification covers a resin-impregnated glass fabric honeycomb core in the form of flat
6、or contoured sandwich structures.1.2 Application:This product has been used typically for structural and electrical parts requiring low weight, strength, and good electrical resistance up to 300 F (149 C), but usage is not limited to such applications.1.3 Safety-Hazardous Materials:While the materia
7、ls, methods, applications, and processes described or referenced in thisspecification may involve the use of hazardous materials, this specification does not address thehazards which may be involved in such use. It is the sole responsibility of the user to ensurefamiliarity with the safe and proper
8、use of any hazardous materials and to take necessaryprecautionary 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. Theapplicable issue of referenced publications sha
9、ll be the issue in effect on the date of the purchaseorder.SAE INTERNATIONAL AMS3710C Page 2 of 9 2.1 ASTM Publications:Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM C 271 Density of Core Materials for Structural Sandwich ConstructionsASTM C 273 Shear Properties i
10、n Flatwise Plane of Flat Sandwich Constructions or Sandwich CoresASTM C 297 Tensile Strength of Flat Sandwich Constructions in Flatwise PlaneASTM C 364 Edgewise Compressive Strength of Flat Sandwich ConstructionsASTM C 365 Flatwise Compressive Strength of Sandwich CoresASTM C 393 Flexural Properties
11、 of Flat Sandwich Constructions2.2 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue,Philadelphia, PA 19111-5094.MIL-STD-105 Sampling Procedures and Tables for Inspection by AttributesMIL-STD-2073-1 DOD Materiel, Procedures for Developme
12、nt and Application of Packaging Requirements3. TECHNICAL REQUIREMENTS:3.1 Material and Fabrication:Shall consist of a resin-impregnated, glass-fabric honeycomb core covered with resin-impregnated,glass-fabric faces.3.1.1 Core:3.1.1.1 Glass Fabric Reinforcement: The glass fabric reinforcement, prior
13、to being coated, shall be heatcleaned followed by application of a water-resistant finish compatible with the impregnating resin.3.1.1.2 Style of Weave: Each ply of glass fabric used for the honeycomb core shall not exceed 0.004 inch (0.10 mm) in thickness and 2 ounces per square yard (68 g/m2) in w
14、eight. Breakingstrength shall be not less than 88 pounds per inch (15.4 kN/m) edgewise and 86 pounds per inch(15.1 kN/m) pickwise.3.1.2 Impregnating Resin: Shall be a heat-resistant, thermosetting resin.3.1.3 Core Layup: Honeycomb core material shall be a random layup but symmetrically positioned at
15、 diametrically opposite locations. Adjacent blocks of honeycomb whose joints are parallel to theribbon direction shall be intermeshed (See 3.1.3.1) or butted. All other joints shall be intermeshed.The honeycomb shall not be gored.SAE INTERNATIONAL AMS3710C Page 3 of 9 3.1.3.1 Intermesh is defined as
16、 the positioning of adjacent blocks of honeycomb such that the outermost edge of one block shall fall within the outermost edge of the adjacent block. This shall beaccomplished without crushing or damaging the honeycomb core material.3.1.4 Faces: The thickness of faces and their tolerances shall be
17、as specified by purchaser. The facesshall be premolded or laminated prior to bonding to the core. If required, a peel-ply-wet-plybonding technique may be used. Sandwich faces shall be essentially void-free.3.1.4.1 Glass Fabric Reinforcement: Each ply of glass fabric used for the outer faces shall no
18、t exceed 0.016 inch (0.41 mm) in thickness and 10 ounces per square yard (339 g/m2) in weight.3.1.4.2 Impregnation Resin: Shall be a heat-resistant, thermosetting resin.3.1.5 Core-To-Face Bonding Resin: The resin or adhesive used for bonding the sandwich faces to the honeycomb core shall be a suppor
19、ted or unsupported, heat-resistant epoxy compound.3.1.6 Edge Band Sealant and Local Reinforcements: The product shall be supplied free of edge band sealant and locally embedded reinforcements.3.1.7 Core-to-Face Bond: The sandwich faces shall be uniformly and firmly bonded to the core material over t
20、he entire area of the sandwich structure. There shall be a substantial fillet of resin where the honeycomb contacts the face material. Excessive resin deposits, which affect electricaltransmission efficiency, are not permitted. Ubonded areas between the outer face and the core are not acceptable.3.2
21、 Condition:The bonded construction shall be cured to meet the requirements of 3.3 and supplied in theunpainted condition.3.3 Properties:Sandwich constructions having nominal cell size (distance between parallel sides of a cell measuredperpendicular to the ribbon direction) of the core of 3/16 inch (
22、4.8 mm) shall conform to requirementsshown in Table 1; properties of constructions having nominal core cell size other than 3/16 inch(4.8 mm) shall be as agreed upon by purchaser and vendor. Tests shall be performed in accordancewith specified test methods, insofar as practicable, except that dielec
23、tric constant and dissipation factor tests shall be determined by procedures acceptable to purchaser.3.3.1 Honeycomb Core: Shall be as shown in Table 1.SAE INTERNATIONAL AMS3710C Page 4 of 9 3.3.2 Sandwich Panels: Flat sandwich panels, 0.500 inch 0.015 (12.70 mm 0.38) total thickness, having 0.040 i
24、nch 0.005 (1.00 mm 0.13) thick faces and 3/16 inch (4.8 mm) cells, representative of the construction supplied, shall conform to the requirements shown in Table 2,3.3.2.7, 3.3.2.8 and 3.3.2.9; tests shall be performed in accordance with the listed ASTM Methods, insofar as practicable:TABLE 1 - Prope
25、rties, Honeycomb CoreParagraph Property Requirement Test Method3.3.1.1 Density 8.0 to 10.0 poundsper cubic foot(128 to 160 kg/m3)ASTM C 2713.3.1.2 Dielectric Constant at9375 MHz 1%, maximum 1.283.3.1.3 Dissipation Factor at9375 MHz 1%, maximum 0.0043.3.1.4 Compressive Strength, 1/2 inch(12.7 mm) thi
26、ck specimens, minimum1500 psi(10.3 MPa)ASTM C 365TABLE 2 - Properties, Sandwich PanelsParagraph Property Requirement Test Method3.3.2.1 Compressive Strenght, minimumAt 70 F 2 (21 C 1) 1500 psi (10.3 MPa)1500 psi (10.3 MPa)ASTM C 3643.3.2.2At 300 F 5 (149 C 3)after 192 hours at 300 F 5(149 C 3)Shear
27、Strength, minimumAt 70 F 2 (21 C 1) 800 psi (5.52 MPa)600 psi (4.14 MPa)ASTM C 2733.3.2.3At 300 F 5 (149 C 3)after 30 minutes 5 at 300 F 5(149 C 3)Shear ModulusAt 70 F 2 (21 C 1)At 300 F 5 (149 C 3)after 30 minutes 5 at 300 F 5(149 C 3)40.0 ksi (276 MPa)30.0 ksi (207 MPa)ASTM C 273SAE INTERNATIONAL
28、AMS3710C Page 5 of 9 3.3.2.7 Power Transmission Efficiency: The power transmission efficiency of the sandwich structure at 9375 MHz 10 when oriented at a 20-degree angle of incidence using parallel and perpendicularpolarization shall be not less than 95% when tested at 50% 5 relative humidity. The s
29、andwich transmission efficiency shall be not less than 90% after exposure to 25 cycles of heating toequilibrium at +158 F (+70 C) and cooling to equilibrium at -35 F (-37 C) followed by 50 cycles of simulated altitude exposure within the range 8,000 to 50,000 feet (2,438 to 15,240 m) withcondensatio
30、n on the panel surfaces.3.3.2.8 Weather Resistance: When specified, the product shall have weather resistance acceptable to purchaser, determined by a procedure agreed upon by purchaser and vendor.3.3.2.9 Corrosion: The product shall not have a corrosive effect on other materials when exposed to con
31、ditions normally encountered in service, determined by a procedure agreed upon by purchaser and vendor. Discoloration of metals shall not be considered objectionable.3.4 Quality:The product, as received by purchaser, shall be uniform in quality and condition, smooth, and free from foreign materials
32、and from imperfections detrimental to usage of the product.3.4.1 Surface Condition: The surfaces of the sandwich structure shall be free of adhesion-inhibiting materials.3.4.2 Imperfections: Molded sandwich structures shall have no imperfections which exceed themaximum allowable limits of 3.4.2.1 th
33、rough 3.4.2.4.3.4.2.1 Gaps: Not more than 20% of the total amount of honeycomb jointed lengths may have gaps up to one-half cell diameter in dimension for a maximum total gap length of 8 inches (203 mm) including all adjacent pieces. Not more than 5% of the total amount of honeycomb jointedlengths m
34、ay have gaps up to one cell diameter in dimension for a maximum total gap length of5 inches (127 mm) between adjacent pieces.3.3.2.4 Flatwise Tensile Strength, minimumAt 70 F 2 (21 C 1) 600 psi (4.14 MPa)ASTM C 2733.3.2.5 Shear Strength, (sandwich structureflat only), minimumParallel to ribbonPerpen
35、dicular to ribbon400 psi (2.76 MPa)400 psi (2.76 MPa)ASTM C 3933.3.2.6 Flexural Strength, (sandwich structureflat only), minimumParallel to ribbonPerpendicular to ribbon290 psi (2.00 MPa)170 psi (1.17 MPa)ASTM C 393TABLE 2 - Properties, Sandwich Panels (Continued)Paragraph Property Requirement Test
36、MethodSAE INTERNATIONAL AMS3710C Page 6 of 9 3.4.2.2 Unbonded Areas: Unbonded areas not larger than 1 square inch (6.5 cm2) shall be allowedbetween the inner skin of the sandwich and the core if the total area of these unbonded areas is less than 0.5% of the total face-to-core area. Unbonded areas s
37、hall also be limited to not more than one per each 3 foot (914 mm) square and they shall be no closer than 6 inches (152 mm)from each other.3.4.2.3 Resin Pools: A resin pool not larger than 1 square inch (6.5 cm2) in area is permitted on the innerskin of the sandwich if the total area of such a resi
38、n pool is less than 1% of the total face-to-core area. Resin pools also shall be limited to not more than one per each 3 foot (914 mm) square and they shall be not closer than 6 inches (152 mm) from each other.3.4.2.4 Other small surface imperfections, such as reduction of void-freeness (excluding c
39、ontaminants)on the inner skin of the sandwich, not exceeding 1 square inch (6.5 cm2) in area, are allowed.The total area of these imperfections shall be less than 5% of the total face-to-core area. Suchimperfections shall be limited to not more than one per each 3 foot (914 mm) square and they shall
40、 be not closer than 6 inches (152 mm) from each other.3.5 Tolerances:Thickness tolerances of sandwich panels shall be as specified by purchaser.4. QUALITY ASSURANCE PROVISIONS:4.1 Responsibility for Inspection: The vendor of sandwich panels shall supply all samples for vendors tests and shall be res
41、ponsiblefor performing all required tests. Purchaser reserves the right to sample and to perform anyconfirmatory testing deemed necessary to ensure that the panels conform to the requirements of this specification.4.2 Classification of Tests:4.2.1 Acceptance Tests: Tests for material and fabrication
42、 (3.1), flatwise tensile strength (3.3.2.4),flexural strength (3.3.2.6), quality (3.4), and tolerances (3.5) are acceptance tests and shall beperformed on each lot.4.2.2 Preproduction Tests: Tests for all technical requirements are preproduction tests and shall be performed prior to or on the initia
43、l shipment of panels to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testingto be required.4.2.2.1 For direct U.S. Military procurement, substantiating test data and, when requested,preproduction test material shal
44、l be submitted to the cognizant agency as directed by theprocuring activity, contracting officer, or request for procurement.SAE INTERNATIONAL AMS3710C Page 7 of 9 4.3 Sampling and Testing:Shall be as follows:4.3.1 For Acceptance Tests: In accordance with Single Sampling for Normal Inspection, Gener
45、alInspection Level II, specified in MIL-STD-105. Sufficient product shall be taken from inspection units selected at random from each production lot to perform all required tests and to allow forinvalid tests. The number of determinations for each requirement shall be as specified in the applicable
46、test procedure or, if not specified therein, not less than three.4.3.1.1 A lot shall be all sandwich panels produced from the same batches of ingredients, using the same processing conditions on the same machine, and presented for vendors inspection at one time.4.3.1.2 When a statistical sampling pl
47、an has been agreed upon by purchaser and vendor, sampling shallbe in accordance with such plan in lieu of sampling as in 4.3.1 and the report of 4.5 shall statethat such plan was used.4.3.2 For Preproduction Tests: As agreed upon by purchaser and vendor.4.4 Approval:4.4.1 Sample panels shall be appr
48、oved by purchaser before panels for production use are supplied,unless such approval be waived by purchaser. Results of tests on production panels shall be essentially equivalent to those on the approved sample.4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of i
49、nspection onproduction panels which are essentially the same as those used on the approved sample. Ifnecessary to make any change in ingredients, in type of 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 panels. Production panels
