1、SAE-AMS-C-81986ADOPTION NOTICESAE-AMS-C-81986, “MATERIAL, CORE, PLASTIC HONEYCOMB, NYLON PAPERBASE; FOR AIRCRAFT STRUCTURAL APPLICATIONS“, was adopted on18-DEC-98 for use by the Department of Defense (DoD). Proposedchanges by DoD activities must be submitted to the DoD AdoptingActivity: Commander, N
2、aval Air Warfare Center, Aircraft Division,Code 414100B120-3, Highway 547, Lakehurst, NJ 08733-5100. Copiesof this document may be purchased from the Society of AutomotiveEngineers 400 Commonwealth Drive Warrendale, Pennsylvania, UnitedStates, 15096-0001. http:/www.sae.org/_Custodians: Adopting Acti
3、vity:Navy - ASNavy - ASFSC 5680DISTRIBUTION STATEMENT A: Approved for public release; distributionis unlimited.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,
4、and its applicability and suitability for any particular use, including any patent infringement arising therefrom, 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
5、comments and suggestions.Copyright 1998 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.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 Driv
6、e, Warrendale, PA 15096-0001AEROS PACE MATERIAL SPECIFIC ATIONSubmitted for recognition as an American National StandardAMS-C-81986 Issued JUL 1998 Core Material, Plastic Honeycomb, Nylon Paper Base;for Aircraft Structural ApplicationsNOTICEThis document has been taken directly from U.S. Military Sp
7、ecification MIL-C-81986, Amendment 1, and contains only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards. The initial release of this document is intended to replace MIL-C-81986, Amendment 1. Any part numbers establi
8、shed by the original specification remain unchanged.The original Military Specification was adopted as an SAE standard under the provisions of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB ru
9、les provide for (a) the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Committee level, and (b) the use of the existing government specification or standard format.Under Department of Defense policies and procedures, any qualification
10、 requirements and associated qualified products lists are mandatory for DOD contracts. Any requirement relating to qualified products list (QPLs) has not been adopted by SAE and is not part of this technical report.1. SCOPE:1.1 Scope: This specification covers the requirements for nonperforated nylo
11、n paper base plastic honeycomb core material for aircraft structural applications, including exterior parts such as radio and radar antenna housings.AMS-C-81986 SAE AMS-C-81986- 2 -2. APPLICABLE DOCUMENTS: The following publications, of the issue in effect on date of invitation for bids or request f
12、or proposal, form a part of this specification to the extent specified herein.2.1 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-P-116 Preservation, Methods ofMIL-STD-105 Sampling Procedures and Tables
13、 for Inspection by AttributesMIL-STD-129 Marking for Shipment and StorageMIL-STD-401 Sandwich Constructions and Core Materials, General Test MethodsPPP-B-585 Box, Wood, WireboundPPP-B-591 Box, Fiberboard, Wood-CleatedPPP-B-636 Box, Fiberboard2.2 National Standards Association, Inc.: Available from t
14、he National Standards Association, Inc., 1321 Fourteenth Street NW, Washington, D.C. 20005.ATC Report No. Electrical Test Procedures for Radomes and RadomeARTC-4 Materials3. REQUIREMENTS: 3.1 Preproduction sample: When specified in the contract or order (see 4.4.2 and 6.2), preproduction samples of
15、nylon paper core material of designated density, cell size dimension, resin bond, and core cell configuration shall be manufactured using the methods and processes proposed for the production lot. These samples are for the purpose of determining that the manufacturers production methods and processe
16、s will produce core material that will meet the requirements of this specification. These samples shall be inspected as specified in Section 4 and shall be submitted as directed by the procuring activity for examination and approval.3.1.1 Material and property control: Prior to production, material
17、and property controls shall be established for the core cell size, type and quantity of the stabilizing resin, adhesive, and bonding methods. The control shall be continued until the application of resin and adhesive, assembly of the materials and curing of the adhesive practices have been establish
18、ed to produce core materials conforming to this specification. When processing practices have been so established, the production shall not be changed without demonstrating to the satisfaction of the procuring activity that the change does not adversely affect the quality of the core material.AMS-C-
19、81986 SAE AMS-C-81986- 3 -3.1.1.1 Preproduction sampling and testing (see 3.1) shall be required whenever one or more changes are made with the processing of the core material, adhesive, bonding, design or fabrication techniques.3.2 Materials: The materials comprising the core shall conform to the a
20、pplicable specifications and shall be as specified herein. Materials, which are not covered by applicable specifications, or which are not specifically described herein, shall be subjected to the approval of the procuring activity.3.2.1 Paper: The fiber paper shall be composed of an aromatic polyami
21、de polymer (nylon) in the form of short fibers (floc), bonded together with small fibrous binder particles (fibrids) of the same material, and shall contain no extraneous diluents. The paper shall not be perforated.3.2.2 Resin: The resin system used to coat the paper, or for node bonding, shall be r
22、esistant to mildew and shall not be corrosive to metals. Node bonding shall be accomplished with the same resin used for coating, or with a compatible resin adhesive.3.3 Configuration: The core material shall consist of thin nylon paper base sheets bonded together to form cells approximately hexagon
23、al in shape (See Figure 1).3.4 Sizes: The material shall be furnished in blocks or slices, as specified by the procuring activity. The dimensions and dimensional tolerances for the blocks or slices shall be as specified by the procuring activity.3.5 Cure: The honeycomb core material shall be fully c
24、ured. When specified, the material may be furnished in a partially cured state to afford better conformability when used in curved sections. In this case the material shall be fully cured in accordance with the manufacturers instructions prior to testing.3.6 Bond or slicing test: The node bonds of t
25、he honeycomb core material shall be sufficiently strong so as to meet the requirements specified herein when machined in accordance with manufacturers recommendations.3.7 Cell wall edges: The honeycomb cell wall edges on the faces of the sliced core shall be in a condition as specified by the procur
26、ing activity, suitable for forming a good bond, as when wet-laminated to glass fabric base plastic laminate.AMS-C-81986 SAE AMS-C-81986- 4 -FIGURE 1AMS-C-81986 SAE AMS-C-81986- 5 -3.8 Core properties: The nominal cell size, density, compressive properties of the core in the direction of the cells (p
27、arallel to the T direction, as illustrated in Figure 1), and the shear properties (associated with distortion in the TW and TL planes), shall conform to the requirements of Table I.3.8.1 Mechanical properties at elevated temperature: Core material shall retain a minimum of 70 percent of the minimum
28、values in Table I when tested at 350 10F.3.8.2 Wet strength: Compressive strength of the core in wet condition shall be no less than 90 percent of the minimum values in Table I.3.9 Electrical properties: The dielectric constant of the core material shall not exceed 1.5. The material shall be conditi
29、oned at room temperature for 48 hours at 50 2 percent relative humidity before testing.3.10 Density: The density of core shall be as specified in Table I. The manufacturer shall specify the nominal density of his core and shall control this density to 10 percent by weight in production.3.11 Workmans
30、hip: 3.11.1 The core materials shall be uniform, free from excess resin accumulations, starved areas, tackiness, blisters, foreign materials, and other defects, such as nested cells, split or buckled cell wall and unbonded nodes, except as specifically permitted herein.3.11.2 Defects: No more than t
31、wo flaws per square foot of slice shall be permitted per unit of core material. For the purpose of this specification flaws shall be defined as misalignments and flute bond defects. A misalignment shall be defined as the partial imposition of one corrugation into another, and a defective flute bond
32、is a bond having less than 75 percent of available width bonded. No more than one cell wall break per square foot of slice shall be permitted.3.12 Identification of product: Each unit of core material shall be suitably identified with the following information:Manufacturers Name or TrademarkOrder Nu
33、mber and Lot NumberSpecification NumberDensity and Cell SizeState whether the material is fully or partially cured. And manufacturers directions for cure if the material is partially cured.Resins, both impregnating and bondingAMS-C-81986 SAE AMS-C-81986- 6 -TABLE I. PROPERTIES OF CORE MATERIALS 1 /4
34、. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for inspection: Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilit
35、ies or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.AMS-C-81986 SAE AMS-C-81986
36、- 7 -4.2 Classification of tests: The inspection and testing of plastic core material for sandwich construction shall be classified as follows:(a) Preproduction tests(b) Quality conformance tests4.3 Test conditions: The laboratory testing conditions shall be in accordance with MIL-STD-401 and as des
37、cribed herein.4.4 Preproduction tests: 4.4.1 Sampling for preproduction inspection: Except as specified in 4.4.2, as soon as possible after the award of contract, the contractor shall submit to a testing activity designated by the procuring activity the preproduction samples of core material. Whethe
38、r or not a preproduction sample is required, the contractor shall supply a certified statement of composition and prior tests which show the core material complies with the requirements of this specification. The statement shall also include the manufacturers trade name and code number for material,
39、 the bonding material used to produce the core material and a general description of the processes for the fabrication of the submitted samples. Process and non-proprietary control data information pertinent to the adhesive bonding of the core material for its manufacture shall also be furnished.4.4
40、.1.1 Test samples: The preproduction samples shall consist of at least 28 square feet of the core material cut to a thickness of 0.5 inch.4.4.1.2 Further production: Further production of the core material for sandwich construction by the contractor prior to the approval of the procuring activity or
41、 completion of inspection of the preproduction sample shall be at the contractors risk.4.4.2 Preproduction sample and inspection for a subsequent contract: If a contractor has previously delivered core material for sandwich construction in accordance with the requirements of this specification and h
42、is product has been found to be satisfactory, the requirements for a preproduction sample and its submittal in accordance with 4.4.1 for any subsequent contract or order may be waived at the discretion of the procuring activity (see 6.2).4.4.3 Preproduction testing of the core material for sandwich
43、construction shall consist of all examinations and tests of this specification. The responsibility for the performance of the preproduction testing shall be as specified in the contract or order (see 3.1 and 6.2).AMS-C-81986 SAE AMS-C-81986- 8 -4.5 Quality conformance tests: 4.5.1 Lot: Unless otherw
44、ise specified in the contract or order, a lot shall consist of not more than 100 cubic feet of core material for sandwich construction of the same designated cell size dimension, density and core configuration design, manufactured under essentially the same conditions and submitted for acceptance at
45、 the same time.4.5.2 Sampling: Unless otherwise specified in the contract, purchase order or drawing information, sampling plans and procedures in the determination of the acceptability of products submitted by a supplier shall be in accordance with the provisions set forth in MIL-STD-105.4.5.2.1 Vi
46、sual and dimensional examination: A random sample of core material shall be selected from each lot in accordance with procedures of MIL-STD-105, Inspection Level II, Acceptable Quality Level 2.5 percent defective for test of 4.5.3.4.5.2.2 Physical and mechanical properties: A random sample shall be
47、selected from each lot sufficient to conduct the tests of 4.6.1, 4.6.2, 4.6.3 and 4.6.4. Samples used for the core density test may be used for the determination of cell size and the strength tests.4.5.3 Examination: The sample core material selected in accordance with 4.5.2.1 shall be visually and
48、dimensionally examined to determine compliance with the requirements of this specification for configuration (see 3.3), non-perforation (see 3.2.1), node bonds (see 3.2.2), cell wall edges (see 3.7), size (see 3.4), bond defects and workmanship (see 3.11).4.5.4 Preservation, packaging, packing and m
49、arking: The preservation, packaging, packing and marking of items furnished under this specification shall be in accordance with the applicable requirements of Section 5.4.5.5 Inspection of material: The materials (see 3.2) used in the manufacture of the core material furnished under this specification shall be inspected and accepted as specified herein. The contractor shall furnish certification that the above requirements have been met.4.6 Test methods: 4.6.1 Core density: The density of the core shall be determined in accordance with MIL-STD-401.4.6.2 Cell
