1、I INCH-POUND I M I LL-8 1293 A(0S) 22 Julv 1992 SUPERSEDING 16 June 1965 MIL-L-81293(WP) MILITARY SPECIFICATION LIGHTWEIGHT SANDWICH-CONSTRUCTED PANELS (for ASROC Launcher MK 112) nis specijcation is approved for use by the Naval Sea Systems Communri, Departinent of tlie Navy, and is available for u
2、se by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers lightweight sandwich-constructed panels for use in the ASROC Launcher MK 112. 1.2 Types. Panels shall be of the following types as specified (see 6.2): Type I - Side Panel Assembly Type II
3、- Lower Panel Assembly Type 111 - Intermediate Panel Assembly Type IV - Top Panel Assembly 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards and handbooks. The following specifications, standards and handbooks form a part of this document to the extent specified herei
4、n. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pert
5、inent data which may be of use in improving this document should be addressed to: Commander, Indian Head Division, Naval Surface Warfare Center, Standardization Branch (Code 0343). 1 O1 Strauss Avenue, Indian Head, MD 20640-5035 by using the Standardization Document Improvement Proposal (DD Form 142
6、6) appearing at the end of this document or by letter. AMSC N/A FSC 5640 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-S PE CI F I CAT 1 ON S FEDERAL MMM-A-132 Adhesi
7、ves, Heat Resistant, Airframe, Structural, Metal-to-Metal PPP-6-636 Boxes, Shipping, Fiberboard MILITARY MIL-C-104 Crates, Wood; Lumber and Plywood Sheathed, Nailed and Bolted MIL-C-5541 Chemical Conversion Coating on Aluminum and Aluminum Alloys MIL-A-9067 Adhesive Bonding, Process and Inspection R
8、equirements for MIL-L-10547 Liners, Case, and Sheet, Overwrap; Water-vaporproof or Waterproof, Flexible MIL-A-25463 Adhesive, Film Form, Metallic Structural Sandwich Construction STANDARDS MILITARY MIL-STD-129 Marking for Shipment and Storage MIL-STD401 Sandwich Constructions and Core Materials; Gen
9、eral Test Methods (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 191 1 1-5094.) 2.1.2 Other Government documents, drawings, and publica
10、tions. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. DRAWINGS NAVAL SEA SYSTEMS COMMAND (CAGE Code 5371 1) 2 Provided by IHSNot for ResaleNo
11、 reproduction or networking permitted without license from IHS-,-,-MIL-L-L293A 5b 999990b LLb5355 O20 m MIL-L-81293A(OS) 59791 94 Panel Assembly, Side 59791 95 Panel Assembly, Lower 59791 96 Panel Assembly, Intermediate 59791 97 Panel Assembly, Top (Application for copies of NAVSEA drawings should b
12、e addressed to the Commanding Officer, Naval Ordnance Station, Crane Division, Naval Surface Warfare Center, Attn: Code 802, Louisville, KY 40214-5001 .) 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified,
13、the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN IRON AND STEEL INSTITUTE
14、 (AISI) AISI 1015-1025 Steel (Application for copies may be obtained from the American Iron and Steel Institute, 1000 16th Street N. W., Washington, DC 20036.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM-A6 Rolled Steel Plates, Sheet Piling, and Bars for Structural Use (DOD adopted) ASTM-
15、A36/A36M Structural Steel (DOD adopted) ASTM-A108 Steel Bars, Carbon, Cold-Finished, Standard Quality (DOD adopted (Application for copies may be otbained from the American Society for Testing and Materials, 191 6 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications
16、 are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited here
17、in, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. O 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. REQUIREMENTS 3.1 First
18、 artide. When specified (see 6.21, a sample, consisting of one Intermediate Panel Assembly in accordance with NAVSEA Drawing 59791 96, shall be subjected to first article inspection (see 6.3) in accordance with 4.4. The panel shall be laid up and bonded utilizing tooling, materials, and manufacturin
19、g methods for regular production runs. 3.2 Design. The panels covered by this specification shall be formed in a three piece laminated construction. The panels shall be formed by bonding ribbon foil between two pieces of sheet aluminum, using a resin as a bonding agent, and applying pressure to posi
20、tion the laminations until the resin is set. 3.2.1 Dimensions. The completed panels shall be types I, II, 111 or IV conforming to NAVSEA Drawings 59791 94, 57791 95, 59791 96, or 59791 97 respectively (see 1.2) as specified in the contract or purchase order (see 6.2). The panels shall meet the dimen
21、sions and tolerances specified on the applicable product drawing. 3.3 Materials. Unless otherwise specified in the contract or purchase order (see 6.2), all materials entering into the final assembly of the product shall conform to the requirements indicated on the applicable drawings listed in 3.2.
22、1. 3.4 Finishes and coatings. Finishes and coatings shall be in accordance with the finished panel assemblies shall be applied only by brushing, spraying, roller-coating or swabbing. Immersion of bonded panel assemblies in any type solution or fluid connected with the application of a coating is pro
23、hibited. applicable draw 6 ngs and specifications. It is to be noted that any coating applicable to the 3.5 Marking of assemblies. All completed panels shall be marked in accordance with applicable drawings. 3.6 Product characteristics. The panels shall meet the product characteristics of 3.6.1 thro
24、ugh 3.6.8. 3.6.1 Heat resistance. The panels shall withstand, without evidence of cracking, crazing, delamination, or permanent deformation (see 6.4.1), a temperature of 168 +O, - 10 degrees Fahrenheit (OF) when undergoing the shear strength and flexural strength tests in 4.6.3 and 4.6.4. 3.6.2 Shea
25、r strength. The panels shall withstand, without evidence of failure or permanent deformation, a force of 1680 +40, -0 pounds when tested as specified in 4.6.3. 3.6.3 Flexural strength. The panels shall withstand, without evidence of failure or permanent deformation, the simultaneous application of a
26、 1320 + 30, -0 pound force (660 + 15, -0 pounds each support) when tested as specified in 4.6.4. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.6.4 Density. The panels shall have a weight of not less than 4.1 O and not more than 4.36 pounds per
27、square foot. 3.6.5 Lap shear strength. The panels shall have an average lap shear strength of 2500 pounds per square inch (psi) when tested as specified in 4.6.6. 3.6.6 Short column compression strength. The panels shall sustain a load average of 80,000 psi (30,500 pounds actual load) with no two sp
28、ecimens less than 70,000 psi (28,500 pounds actual load) when tested as specified in 4.6.7. 3.6.7 Side panel assembly strength requirement. The completed side panel assembly, NAVSEA Drawing 59791 94, shall withstand, without evidence of failure or permanent deformation, a force (p) of 25,800 f 500 p
29、ounds, applied in the manner shown on figure 4. The panel shall show no evidence of failure or permanent deformation during and after testing in accordance with 4.5.4.2. 3.6.8 Top, intermediate, and lower panel assemblies strength requirements. The completed top, intermediate, and lower panel assemb
30、lies, NAVSEA Drawings 59791 95, 59791 96 and 59791 97, shall withstand, without evidence of failure or permanent deformation, a force of 12,000 i 500 pounds, applied in the manner shown on figure 4 when tested in accordance with 4.5.4.3. 3.7 Workmanship. The panels and component parts shall be const
31、ructed and finished in such a manner as to assure compliance with all requirements of this specification. Particular attention shall be paid to removal of any adhesive from the outer surface and chemical film coating of the completed panel, neatness and thoroughness of identification marking, and fr
32、eedom from burrs or sharp edges. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order (see 6.21, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. E
33、xcept as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspectio
34、ns set forth in the specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall becom
35、e a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requir
36、ements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-8L293A 56 999990b lLb
37、5358 83T - MIL-L-81293A(OS) authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspec
38、tion (see 4.4). b. Quality conformance inspection (see 4.51. 4.3 Test equipment. The test equipment required for performing first article and quality conformance inspection shall consist of the following: a. b. C. d. e. f. Two supporting pieces, 1 .O inch by 2.0 inches by 3.0 inches long, made of mi
39、ld steel conforming to AISI 1 O1 5-1 025 (Alternate: ASTM-A108, FS 1 O1 5-1 025). For details of contoured edges, refer to figure 1; pieces are identified by letter A. One pressure piece, 1.5 inches by 2.0 inches by 3.0 inches long, made of mild steel conforming to AISI 101 5-1025 (Alternate: ASTM-A
40、108, FS 1 O1 5-1 025). For details of contoured edges, refer to figure 1 ; piece is identified by letter B. Four pieces, 0.5 inch by 3.0 inch by 3.0 inch angle, approximately 3.0 inches long, of mild steel conforming to ASTM-A6 (Alternate: ASTM-A36/A36M). These pieces are designated by letter C as s
41、hown on figure 2. Four pieces, 1 .O inch by 2.0 inches wide by approximately 3.0 inches long, of mild steel conforming to AISI 1 O1 5-1 025 (Alternate: ASTM-A108, FS 101 5-1025). Each of these pieces, designated by letter D on figure 2, shall have a groove milled on 0.28 inch radius, centered and ru
42、nning longitudinally on the wide face. One piece, 1 .O inch thick by 3.0 inches wide by approximately 22 inches long, of mild steel conforming to AISI 1 O1 5-1 025 (Alternate: ASTM-A108, FS 1015-1025). Piece is identified by letter F on figure 2. Two of the angles, designated by C, may be welded to
43、piece marked F; the center-to-center distance of the extending legs of the angles shall be 15.0 I 0.1 2 inches. Three pieces, 4.0 inches thick by 6.0 inches wide by 64.0 inches long, of mild steel conforming to AISI 1 O1 5-1 025 (Alternate: ASTM-A108, FS 1 O1 5-1 025). These pieces are designated as
44、 G on figure 4. The edges of these pieces which come in contact with the panel during testing shall have a radius of 0.06 inch. 4.4 First article inspection. The panel assembly specified in 3.1 shall be subjected to the first article inspection. The panel shall first be subjected to the applicable s
45、trength testing as specified under 4.5.4.3. Upon completion of the strength test, the panel shall be cut to provide test specimens and tested as specified under 4.6.1 through 4.6.7. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-81293A 5b 99
46、9990b LLb5359 776 W MIL-L-81293A(OS) Failure of the panel assembly or any of the test specimens cut from the panel assembly to pass the inspection and tests described herein shall be cause for rejection of the first article. 4.5 Quality conformance inspection. For the purpose of this specification,
47、two methods of quality conformance inspection are applicable for final tests and examinations on panels fabricated in accordance with 3.2. The methods are: a. Method A, Nondestructive Testing (see 4.5.4). b. Method B, Destructive Testing (see 4.5.5). Method A shall be performed unless there is a cha
48、nge in manufacturing processes during production of the lot. 4.5.1 Inspection lot. The inspection lot shall consist of all panels fabricated in a continuous daily production run, not to exceed 40 panels, without a change in process or tooling. Changes in process, tooling, or shutdowns in which produ
49、ction is interrupted for two hours or more, shall constitute the end of one production run and the beginning of a new production run. If required (see 6.21, identification of inspection lots and panels within inspection lots shall be as specified in the contract or purchase order. 4.5.2 Visual examination. All panels offered for acceptance will be visually examined 0 for defects in workmanship, and measurements shall be taken to assure that the panels conform with t
