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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility 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 2018 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AMS4348E AEROSPACE MATERIAL SPECIFICATION AMS4348 REV. E Issued 1977-07 Reaffirmed 2011-11 Revi
5、sed 2018-01 Superseding AMS4348D Core, Honeycomb, Aluminum Alloy, Corrosion Inhibited For Sandwich Construction 5052, 350 (177) RATIONALE AMS4348E revises Material (3.1.1), Designation (3.2.1), Perforations (3.2.2), Quality (3.5), Reports (4.6), and Identification (5.1.1, Table 3, 5.1.3), and is a F
6、ive-Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers bonded honeycomb core made of aluminum alloy and supplied in the form of blocks, slices, or other configurations as ordered. 1.2 Application This honeycomb core has been used typically in sandwich construct
7、ion for short-term exposure up to 350 F (177 C) or for long-term exposure up to 200 F (93 C), but usage is not limited to such applications. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may involve the use of
8、 hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safet
9、y of all personnel involved. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is sp
10、ecified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. SAE INTERNATIONAL AMS4348E Page 2 of 13 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-
11、0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS-A-81596 Aluminum Foil for Sandwich Construction AMS-STD-595 Colors Used in Government Procurement ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 2.2 ASTM Publications Available
12、from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B117 Salt Spray (Fog) Testing ASTM C273 Shear Properties in Flatwise Plane of Flat Sandwich Constructions or Sandwich Cores ASTM C365 Flatwise Compressive Strength o
13、f Sandwich Cores 3. TECHNICAL REQUIREMENTS 3.1 Material 3.1.1 Metal Shall be AMS-A-81596, alloy 5052 aluminum alloy foil of the thickness specified on the part drawing or purchase order except that maximum foil thickness shall be as specified in Table 1. 3.1.2 Adhesive The adhesive system used for n
14、ode-to-node attachment shall be such that the resultant core meets the requirements specified herein. 3.2 Configuration The core material shall consist of strips of aluminum alloy foil treated for corrosion protection, bonded together such that cells approximately hexagonal in shape are formed when
15、fully expanded (see Figure 1). 3.2.1 Designation Core shall be designated according to the following numbering system: Nominal density, pounds per cubic foot (kg/m3) Cell size, inch (mm) Foil thickness, ten-thousandths inch (m) “N” for nonperforated or “P” for perforated, or “HP” for highly perforat
16、ed Alloy Adhesive, option of supplier Example: Core with a nominal density of 4.3 pounds per cubic foot (69 kg/m3) with a 1/4 inch (6.4 mm) cell size, 0.0020 inch (51 m) foil thickness, nonperforated, made of 5052 aluminum alloy, and bonded with required adhesive shall be numbered as follows: 4.3 -
17、1/4 20N (5052) (XXXX) in inch/pound units 69 - 6.4 51N (5052) (XXXX) in SI units SAE INTERNATIONAL AMS4348E Page 3 of 13 3.2.2 Perforations Unless otherwise specified, the aluminum foil shall be non-perforated. When perforation Type P or HP is specified, the perforations shall be of such a size and
18、location that all cells are vented at least every 1/4 inch in thickness dimension. When Type HP is specified, there shall be no fewer than 6000 perforations per square foot of foil, uniformly spaced and staggered. 3.2.3 Cell Pitch Shall be 1.733 times the nominal cell size, +20%, -10%, measured by t
19、aking the average distance between ten nodes along a ribbon for six different ribbons. 3.3 Condition Core shall be supplied in the expanded form; it shall be clean, free of contamination, and treated for corrosion resistance. 3.4 Properties Core, having nominal dimensions as specified in Table 1, sh
20、all conform to the following requirements; tests shall be conducted on the core supplied in accordance with specified test methods. Properties of core having nominal dimensions other than specified in Table 1 shall be acceptable to purchaser. 3.4.1 Flatwise Compressive Strength The minimum individua
21、l values shall be as specified in Table 1, determined in accordance with 4.5.1. 3.4.2 Plate Shear Strength and Plate Shear Modulus Shall be as specified in Table 1, determined in accordance with ASTM C273 at 77 F 5 F (25 C 3 C), using a 0.625 inch (15.88 mm) thick specimen. 3.4.3 Node Bond Strength
22、Shall be not less than 30 pounds force (133 N) at 77 F 5 F (25 C 3 C) and not less than 15 pounds force (67 N) at 350 F 5 F (177 C 3C), determined in accordance with 4.5.2. 3.4.4 Core Density Shall be within 10% of the specified density, determined in accordance with 4.5.3. 3.4.5 Corrosion Resistanc
23、e Core specimens shall show a weight loss not greater than 125 mg/ft2(1345 mg/m2) of exposed foil area, determined in accordance with 4.5.4. SAE INTERNATIONAL AMS4348E Page 4 of 13 Table 1 Table 1A - Core properties, inch-pound units Cell Size Inch Nominal Foil Thickness Designated Inch Nominal Foil
24、 Thickness Maximum Inch Nominal Density pounds per cubic foot Plate Shear Strength psi, min individual Direction of Test W Plate Shear Strength psi, min individual Direction of Test L Plate Shear Modulus ksi, min average Direction of Test W Plate Shear Modulus ksi, min average Direction of Test L Fl
25、atwise Compressive Strength psi, min (Individual) Bare Flatwise Compressive Strength psi, min (Individual) Stabilized 1/8 0.0007 0.0010 0.0015 0.0020 0.0011 0.0015 0.0022 0.0029 3.1 4.5 6.1 8.1 90 168 272 400 155 285 455 670 16.0 25.0 37.0 50.0 31.0 51.0 77.0 112.0 200 375 650 1000 215 405 680 1100
26、5/32 0.0007 0.0010 0.0015 0.0020 0.0025 0.0011 0.0015 0.0022 0.0029 0.0034 2.6 3.8 5.3 6.9 8.4 70 125 215 328 420 120 215 370 540 690 12.0 20.0 31.0 42.0 52.0 24.0 41.0 64.0 91.0 115.0 150 285 490 770 1070 160 300 535 800 1180 3/16 0.0007 0.0010 0.0015 0.0020 0.0025 0.0030 0.0011 0.0015 0.0022 0.002
27、9 0.0034 0.0042 2.0 3.1 4.4 5.7 6.9 8.1 46 90 160 244 328 400 80 155 280 410 540 670 9.0 16.0 24.0 34.0 42.0 50.0 17.0 31.0 50.0 70.0 91.0 112.0 90 200 360 560 770 1000 100 215 385 600 800 1100 1/4 0.0007 0.0010 0.0015 0.0020 0.0025 0.0030 0.0040 0.0011 0.0015 0.0022 0.0029 0.0034 0.0042 0.0053 1.6
28、2.3 3.4 4.3 5.2 6.0 7.9 32 57 105 155 200 265 390 60 100 180 265 360 445 650 6.0 11.0 18.0 24.0 30.0 36.0 49.0 13.0 21.0 35.0 48.0 62.0 75.0 108.0 60 120 240 350 500 630 970 70 130 250 370 510 660 1050 3/8 0.0007 0.0010 0.0015 0.0020 0.0025 0.0030 0.0040 0.0050 0.0011 0.0015 0.0022 0.0029 0.0034 0.0
29、042 0.0053 0.0065 1.0 1.6 2.3 3.0 3.7 4.2 5.4 6.5 20 32 57 85 115 150 228 300 32 60 100 145 200 255 380 500 4.0 6.0 11.0 15.0 20.0 23.0 32.0 39.0 7.0 13.0 21.0 30.0 40.0 47.0 66.0 84.0 20 60 120 190 270 335 500 700 20 70 130 200 285 355 535 750 SAE INTERNATIONAL AMS4348E Page 5 of 13 Table 1B - Core
30、 properties, SI units Cell Size mm Nominal Foil Thickness Designated m Nominal Foil Thickness Maximum m Nominal Density kg/m3Plate Shear Strength MPa, min individual Direction of Test W Plate Shear Strength MPa, min individual Direction of Test L Plate Shear Modulus MPa, min average Direction of Tes
31、t W Plate Shear Modulus MPa, min average Direction of Test L Flatwise Compressive Strength MPa, min (Individual) Bare Flatwise Compressive Strength MPa, min (Individual) Stabilized 3.2 17.8 25.4 38.1 50.8 27.9 38.1 55.9 73.7 50 72 98 130 0.621 1.158 1.875 2.758 1.069 1.965 3.137 4.619 110 172 255 34
32、5 214 352 531 772 1.379 2.586 4.482 6.895 1.482 2.792 4.688 7.584 4.0 17.8 25.4 38.1 50.8 63.5 27.9 38.1 55.9 73.7 86.4 42 61 85 110 135 0.483 0.862 1.482 2.262 2.896 0.827 1.482 2.551 3.723 4.757 83 138 214 290 359 165 283 441 627 793 1.034 1.965 3.378 5.309 7.377 1.103 2.068 3.689 5.516 8.136 4.8
33、17.8 25.4 38.1 50.8 63.5 76.2 27.9 38.1 55.9 73.7 86.4 106.7 32 50 70 91 110 130 0.317 0.621 1.103 1.682 2.262 2.758 0.552 1.069 1.931 2.827 3.723 4.619 62 110 165 234 290 345 117 214 345 483 627 772 0.621 1.379 2.482 3.861 5.309 6.895 0.689 1.482 2.654 4.137 5.516 7.584 6.4 17.8 25.4 38.1 50.8 63.5
34、 76.2 101.6 27.9 38.1 55.9 73.7 86.4 106.7 134.6 26 37 54 69 83 96 126 0.221 0.393 0.724 1.069 1.379 1.827 2.689 0.414 0.689 1.241 1.827 2.482 3.068 4.482 41 76 124 165 207 248 338 90 145 241 331 427 517 745 0.414 0.827 1.655 2.413 3.447 4.344 6.688 0.483 0.896 1.724 2.551 3.516 4.551 7.239 9.5 17.8
35、 25.4 38.1 50.8 63.5 76.2 101.6 127.0 27.9 38.1 55.9 73.7 86.4 106.7 134.6 165.1 16 26 37 48 59 67 86 104 0.138 0.221 0.393 0.586 0.793 1.034 1.572 2.069 0.221 0.414 0.689 1.000 1.379 1.758 2.620 3.447 28 41 76 103 138 159 221 269 48 90 145 207 276 324 455 579 0.138 0.414 0.827 1.310 1.862 2.310 3.4
36、47 4.826 0.138 0.483 0.896 1.379 1.965 2.448 3.689 5.171 3.5 Quality The core, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the core. 3.5.1 The core shall be free from corrosion, oil, and ot
37、her contamination detrimental to bonding. 3.5.2 A change in color of core material shall be acceptable provided the color change occurs in a line parallel to “L” (Figure 1), indicative of a change in foil material where more than one foil coil is used in the manufacture of a core block. 3.5.3 Expand
38、ed core shall make total facing contact with a flat surface under uniform pressure without resulting in any damage that would cause rejection of the core. 3.5.4 Expanded core splices which have double foils (two ribbons bonded together which cause uneven expansion in the “L” direction (see Figure 1)
39、 shall be acceptable if the double foils are not more frequent than one in any 8 inches (203 mm). SAE INTERNATIONAL AMS4348E Page 6 of 13 3.5.5 A stacking misalignment defect that can occur for honeycomb that is manufactured using a corrugation process, rather than an expansion process. See Figure 2
40、 for a depiction of this defect. 3.5.6 The maximum requirements for imperfections visually observed in any randomly selected 12 inch (305 mm) diameter circle are shown in Table 2. 3.5.6.1 Flakes are excess metal attached to foil edges which do not interfere with measurements of core thickness. 3.5.6
41、.2 Split Cell Walls are free cell walls with a break or tear in the wall, partial or total 3.5.6.3 Buckled Cell Walls are a bend in the free cell wall that creates a dimple on one surface and a dent in the other surface of the slice 3.5.6.4 Unbonded Nodes are a completely open, unbonded node. Partia
42、lly opened nodes with some peeling are not open nodes. Table 2 - Visual imperfections Type of Imperfection Maximum Number for 1/8 Inch (3.2 mm) Cell Size Maximum Number for 5/32 Inch (4.0 mm) Cell Size Maximum Number for 3/16 Inch (4.8 mm) Cell Size Maximum Number for 1/4 Inch (6.4 mm) Cell Size Max
43、imum Number for 3/8 Inch (9.5 mm) Cell Size Mismatched Nodes Loose Metal or Flakes (See 3.5.6.1) Split Cell Walls Buckled Cell Walls Unbonded Nodes 70 35 0 0 2 55 28 0 0 2 40 20 0 0 2 25 12 0 0 2 10 5 0 0 2 3.6 Sizes and Tolerances 3.6.1 Size Core shall be supplied in the size ordered with core dime
44、nsions as described in Figure 1: where: T = thickness, depth, or height dimension measured parallel to the core cell axis L = longitudinal or ribbon (length) dimension measured along the direction of a ribbon W = width dimension measured normal to the ribbon direction 3.6.2 Core Thickness Shall be 0
45、.005 inch (0.13 mm) for machined slices up to 4.0 inches (102 mm) in nominal thickness, 0.062 inch (1.57 mm) for machined slices over 4 inches (102 mm) in nominal thickness, and +0.25 inch (+6.4 mm), -0.00 for raw block. 3.6.3 Length (L) and width (W) of unexpanded core shall be as ordered, +0.25 in
46、ch (+6.4 mm), -0; for expanded core, tolerances shall be +2 inches (+51 mm), -0. 3.6.4 The cell size of any ten adjacent cells shall vary not more than 10% from nominal, determined by taking the average distance between node bonds along the “W” dimension (see Figure 1) for at least 60 cells selected
47、 at random in groups containing ten adjacent cells. 3.6.5 All ribbons shall be parallel to each other within 10 degrees. The ribbon direction shall be determined by measuring the angle between one line through two nodes on the same ribbon (“L” direction), 12 inches (305 mm) apart, and another line i
48、n the principal ribbon direction (see Figure 1). SAE INTERNATIONAL AMS4348E Page 7 of 13 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The manufacturer of core shall supply all samples and shall be responsible for all required tests. Purchaser reserves the right to sample and to
49、perform any confirmatory testing deemed necessary to ensure that the core conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Flatwise compressive strength (3.4.1), node bond strength (3.4.3), and core density (3.4.4) are acceptance tests and shall be performed on each lot. 4.2.2 Preproduction Tests All technical requirements are preproduction tests and shall be p
