1、Designation: E 1091 08Standard Specification forNonmetallic Honeycomb Core for Use in Shelter Panels1This standard is issued under the fixed designation E 1091; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification is for nonmetallic honeycomb
3、 coreused in the manufacture of adhesively bonded sandwich panelsfor tactical shelters. The materials are intended for adhesivebonding to aluminum facings using materials and processesdefined by Practices E 864 and E 874 and Specifications E 865,E 866, and E 990. This specification covers five main
4、types ofhoneycomb for use in sandwich panels, Types I, II, III, IV, andV. Types I, II, and III honeycombs correspond to threehoneycomb densities. Types IV and V are similar to Types IIand III, respectively, but have lower performance require-ments.1.2 The values stated in inch-pound units are to be
5、regardedas the standard. The SI units in parentheses are provided forinformation only. For conversion of quantities in varioussystems of measurement to SI units, refer to Practice E 380.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is th
6、eresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 209 Specification for Aluminum and Aluminum-AlloySheet and PlateC 177 Test Method fo
7、r Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC 366/C 366M Test Methods for Measurement of Thick-ness of Sandwich CoresC 481 Test Method for Laboratory Aging of SandwichConstructionsC 518 Test Method for Steady-State Thermal Tran
8、smissionProperties by Means of the Heat Flow Meter ApparatusD 3951 Practice for Commercial PackagingE 380 Practice for Use of the International System of Units(SI) (the Modernized Metric System)3E 864 Practice for Surface Preparation of Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter Pan
9、elsE 865 Specification for Structural Film Adhesives for Hon-eycomb Sandwich PanelsE 866 Specification for Corrosion-Inhibiting AdhesivePrimer for Aluminum Alloys to Be Adhesively Bonded inHoneycomb Shelter PanelsE 874 Practice for Adhesive Bonding of Aluminum Facingsto Nonmetallic Honeycomb Core fo
10、r Shelter PanelsE 990 Specification for Core-Splice Adhesive for Honey-comb Sandwich Structural PanelsE 1749 Terminology Relating to Rigid Wall RelocatableSheltersF 501 Test Method for Aerospace Materials Response toFlame, with Vertical Test Specimen (For Aerospace Ve-hicles Standard Conditions)32.2
11、 Federal Aviation Regulation:4FAR 25.853(a) Compartment Interiors2.3 Federal Standards:5FED-STD-191A Textile Test MethodsQQ-A-250/8 Aluminum Alloy 5052, Plate and SheetQQ-A-250/11 Aluminum Alloy 6061, Plate and Sheet2.4 Military Standards:5MIL-STD-105 Sampling Procedures and Tables for Inspec-tion b
12、y AttributesMIL-STD-129 Marking for Shipment and StorageMIL-STD-401 Sandwich Constructions and Core Materials;General Test Methods2.5 TAPPI Standard:6T 435-SU-68 Test Method for Hydrogen Ion Concentration1This specification is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings a
13、nd is the direct responsibility of Subcommittee E06.53on Materials and Processes for Durable Rigidwall Relocatable Structures.Current edition approved Nov. 1, 2008. Published December 2008. Originallyapproved in 1986. Last previous edition approved in 2003 as E 1091 03.2For referenced ASTM standards
14、, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.
15、org.4Available from Federal Aviation Administration (FAA), 800 IndependenceAve., SW, Washington, DC 20591, http:/www.faa.gov.5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.6Available from Techn
16、ical Association of the Pulp and Paper Industry (TAPPI),15 Technology Parkway South, Norcross, GA 30092, http:/www.tappi.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.of Paper Extracts, Hot Extraction Method2.6 Other Publicatio
17、ns:Uniform Freight Classification7National Motor Freight Classification8ANSI/ASQC Z1.4 1993 Sampling Procedures and Tablesfor Inspection by Attributes93. Terminology3.1 DefinitionsSee Terminology E 1749 for definitions ofterms used in this specification.3.2 Descriptions of Terms Specific To This Sta
18、ndard:3.2.1 block, na single production unit of honeycombbefore slicing.3.2.2 cell size, nthe average distance between nodebonds, measured along the W direction (Fig. 1), for at least 60cells, selected at random in groups containing 10 adjacent cells.3.2.3 core material, na slice or sheet cut from a
19、 produc-tion block that is used in a honeycomb sandwich panel. Theorientation of the cells in the honeycomb core material asproduced is shown in Fig. 1. The honeycomb core materialsexhibit anisotropic behavior, therefore the following notation isused:L = ribbon direction or longitudinal direction of
20、 core,W = expanded direction or transverse direction of core,T = core thickness or depth, andN = bonded portion of the honeycomb flat sheet material; thehoneycomb cells double wall.3.2.4 first article, na sample sheet of honeycomb from thefirst lot produced.3.2.5 lot, n1000 ft3(28.3 m3) or less of h
21、oneycomb of thesame type produced during consecutive operating or workingdays using the same basic materials and operating conditions.3.2.6 sheet, na slice of honeycomb cut from a productionblock.4. Classification4.1 Five types of nonmetallic honeycomb material arespecified. Their required propertie
22、s are given in Section 6 andin Table 1.5. Ordering Information5.1 Procurement DocumentsPurchasers shall select anyof the desired options offered herein and the procurementdocuments shall specify the following:5.1.1 Title, number, and date of this specification.5.1.2 Type of honeycomb required (see S
23、ection 4).5.1.3 Dimensions required (see 6.4).5.1.4 Cell size required (see 6.2 and 6.4).5.1.5 Whether a first article sample is required (see 3.3).5.1.6 Whether qualification is necessary (see 8.2.2).5.2 When a first article sample is required, specific instruc-tions shall be given regarding arrang
24、ements for examination,test, and approval of the first article.7Available from the Uniform Classification Committee, Room 1106, 222 S.Riverside Plaza, Chicago, IL 60606.8Available from theAmerican TruckingAssociations (ATA), Traffic Department,950 North Glebe Road, Suite 210, Arlington, VA 22203-418
25、1, http:/.9Available from American Society for Quality (ASQ), 600 N. Plankinton Ave.,Milwaukee, WI 53203, http:/www.asq.org.FIG. 1 Orientation of Cells in Honeycomb-Core MaterialE10910826. Materials and Manufacture6.1 MaterialsMaterials shall be as specified herein for thetype ordered and shall comp
26、ly with all provisions of thisspecification for this type.6.2 ConfigurationThe honeycomb material (see Fig. 1)shall consist of a nonmetallic web material, suitably bonded sothat in its final expanded form, a reasonably uniform cellularshape is developed. Unless otherwise specified, the cell sizeshal
27、l not exceed 0.5 in. (12.5 mm).6.3 Flame ResistanceThe honeycomb core material shallmeet the following requirements when tested as specified:6.3.1 Average burn rate shall not exceed 4 in./min.6.3.2 Self extinguishment within 15 s after removal of the60-s applied flame.6.3.3 Burning without flame sha
28、ll not extend into undam-aged area of core material.6.4 DimensionsUsing the methods specified in 7.15, thelength, width, and thickness dimensions of the honeycomb core(see Fig. 1) and the cell size shall be as specified.6.5 Dimensional TolerancesUnless otherwise specified,the dimensional tolerances
29、of the honeycomb core materialshall be as specified in Table 2. The cell size shall not varymore than 10 % from the specified dimension within any lot.6.6 Unbonded NodesThere shall be no more than oneunbonded node within any 10 by 10-in. (250 by 250-mm) areaof the honeycomb core.6.7 Honeycomb Proper
30、ties:6.7.1 Physical and MechanicalThe physical and me-chanical properties of the honeycomb material shall meet therequirements listed in Table 1 when tested using the methodsspecified.6.7.2 pHWhen tested as specified, the pH of the honey-comb material shall meet the requirements listed in Table 1.6.
31、7.3 Fungus ResistanceWhen the fungus resistance isdetermined as specified, the compressive strength of thehoneycomb shall meet the requirements listed in Table 1.6.8 DensityThe density of the honeycomb material, de-termined as specified, shall not exceed the values shown inTable 1 and shall be withi
32、n 610 % of the manufacturersspecified density.6.9 WorkmanshipThe honeycomb core material shall befree of excess resin accumulations (for example, runs andsags), starved areas (for example, lack of resin), and foreignmaterials. The cell wall edges of the core shall be clean cutwith no broken edges.6.
33、10 Thermal ResistanceAt the request of the purchaser,the thermal resistance, determined as specified, shall be re-ported.6.11 Shear Modulus and Compressive ModulusAt therequest of the purchaser, the honeycomb shear modulus andcompressive modulus, determined as specified, shall be re-ported.7. Test M
34、ethods7.1 Test SpecimensUnless otherwise specified, test speci-mens shall be bonded at the same temperature, cure time, andpressure profiles as used in actual shelter panel manufactureand conditioned and tested under standard conditions ofTABLE 1 Honeycomb-Core Material PropertiesType Type I Type II
35、 Type III Type IV Type VMaximum density, lb/ft3(kg/m3) 5.5 (88) 4.4 (70) 3.3 (53) 4.4 (70) 3.3 (53)pH, pH units 7.0 6 0.5 7.0 6 0.5 7.0 6 0.5 6.0 6 0.5 6.0 6 0.5Compressive strength,Apsi (MPa):Dry, minB464 (3.20) 464 (3.20) 232 (1.60) 404 (2.79) 198 (1.37)Wet, minC406 (2.80) 232 (1.60) 116 (0.80) 16
36、3 (1.13) 98 (0.68)At elevated temperatureD394 (2.72) 278 (1.92) 139 (0.96) 185 (1.28) 115 (0.79)Cyclic aging, minimum 363 (2.50) 190 (1.31) 104 (0.72) 119 (0.82) 62 (0.43)After fungus testESee Footnote EShear strength,Apsi (MPa):Dry, minTL core orientationB218 (1.50) 218 (1.50) 116 (0.80) 180 (1.24)
37、 85 (0.59)TW core orientationB130 (0.90) 116 (0.80) 65 (0.45) 113 (0.78) 57 (0.39)Wet, minTL core orientationC203 (1.40) 109 (0.75) 58 (0.40) 86 (0.59) 53 (0.37)TW core orientationC116 (0.80) 58 (0.40) 33 (0.23) 58 (0.40) 32 (0.22)Flatwise tensile strength, min,F:psi (MPa) 406 (2.80) 406 (2.80) 231
38、(1.60) 306 (2.11) 231 (1.60)Brittleness/Impact:Drop height, min, in. (mm) 40 (1016) 30 (762) 20 (508) 30 (762) 20 (508)Water migration resistance:24 h, max, number of cells 3 3 3 3 3ATwo-inch (51-mm) thick core with 0.05-in. (1.3-mm) facings, tested at 73 6 2F (23 6 1C) unless otherwise stated herei
39、n. Shear tests shall be conducted with thecore oriented in the TL and TW planes (Fig. 1).BAt equilibrium with 73 6 2F (23 6 1C), and 50 6 4 % RH.CAfter soaking in water at 70 6 5F (21.1 6 3C) for 48 h with perforated facings.DAfter heating for 30 min at, and tested at, 176 6 5F (80 6 3C).EValues for
40、 compressive strength shall be not less than 85 % of the dry compressive strength values for Types I, II, and III and 80 % for Types IV and V.FTested at 73 6 2F (23 6 1C) with loading blocks bonded directly to each side of core specimen having a minimum area of 9 in.2(5806 mm2).TABLE 2 Dimensional T
41、olerancesDimensionsTolerance, in. (mm)plus minusLength 2.0 (50.8) 0 (0)Width 1.0 (25.4) 0 (0)Thickness 0.010 (0.254) 0.010 (0.254)E109108373 6 2F (23 6 1C) and 50 6 4 % relative humidity (RH).(See Specification E 865.)7.2 DensityTest the density of the honeycomb materialfor compliance with the requi
42、rements given in Table 1.Determine the density using the core density method ofMIL-STD-401 using two specimens, each at least 2.2 ft2(0.2m2) in area. Condition the specimens as specified for at least 48h. Record each individual density value. Determine the averagedensity value of the two specimens.
43、The test is failed if anyaverage density value does not meet the requirements of Table1 and 6.8.7.3 Honeycomb Core ShearThe L by W by I dimensionsof the bonded sandwich specimens shall be 15 by 3 by 2 in.(380 by 75 by 50 mm). The skin shall consist of 0.05-in.(1.3-mm) thick perforated sheet of 5052H
44、34 or 6061T6 alu-minum alloy. The perforated holes shall be 0.13 in. (3.2 mm) indiameter with 0.19 in. (4.8 mm) staggered centers. Theadhesive used for bonding the specimen shall conform toSpecification E 865.7.3.1 WetSoak twelve specimens under a 12-in. (3.0 kPa)head of water at 70 6 5F (21 6 3C) f
45、or at least 48 h. Whenperforated skins are bonded to the core, clear the perforationsof adhesive so that there is at least one hole into each cellthrough each skin. After removal from the water, shake thebonded specimens to remove excess water. Then test thebonded specimens in accordance with the Sa
46、ndwich Flexuretest method of MIL-STD-401 using a 12-in. (305-mm) span,2-point loading system consisting of 2 by 3 by 0.25 in. (50 by75 by 6 mm) loading blocks on13 span. Test six bondedspecimens with the core oriented in the TL plane (Fig. 1) andsix with the core oriented in the TW plane (Fig. 1). R
47、ecord allindividual shear strength values for each plane. The test isfailed if two or more of the six values of each plane do not meetthe requirements of Table 1 or the average value is below Table1.7.3.2 DryCondition twelve specimens as specified in 7.1for at least 48 h, then test as described in 7
48、.3.1. At the optionof the supplier, the skins specified in 7.3 do not necessarilyhave to be perforated. Record all individual shear strengthvalues for each plane. The test is failed if two or more of thesix values for each plane do not meet the requirements of Table1 or the average value is below Ta
49、ble 1.7.4 Honeycomb Core CompressionThe L by W by Tdimensions of the bonded sandwich specimens shall be 4 by 4by 2 in. (100 by 100 by 50 mm). The skin shall consist of0.05-in. (1.3-mm) thick perforated sheet of 5052H34 or6061T6 aluminum alloy (Federal Specifications QQ-A-250/8or QQ-A-250/11) or (Specification B 209). The perforatedholes shall be 0.13 in. (3.2 mm) in diameter with 0.19 in. (4.8mm) staggered centers. The adhesive used for bonding thespecimen shall conform to Specification E 865.7.4.1 WetSoak six spec
