1、Designation: E1091 13Standard Specification forNonmetallic Honeycomb Core for Use in Shelter Panels1This standard is issued under the fixed designation E1091; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. 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 U.S. Department of Defense.1. Scope1.1 This specification is for nonmetallic honeyc
3、omb 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 E864 and E874 and Specifications E865,E866, and E990. This specification covers five main ty
4、pes 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 re
5、gardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard. For conversion of quantities invarious systems of measurement to SI units, refer to PracticeE380.1.3 This standard does not purport to add
6、ress all of thesafety concerns, if any, associated with its use. It is theresponsibility 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:2B209 Specific
7、ation for Aluminum and Aluminum-AlloySheet and PlateC177 Test Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC366/C366M Test Methods for Measurement of Thicknessof Sandwich CoresC481 Test Method for Laboratory Aging of Sa
8、ndwich Con-structionsC518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusE380 Practice for Use of the International System of Units(SI) (the Modernized Metric System) (Withdrawn 1997)3E631 Terminology of Building ConstructionsE864 Practice for Su
9、rface Preparation of Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter PanelsE865 Specification for Structural Film Adhesives for Hon-eycomb Sandwich PanelsE866 Specification for Corrosion-Inhibiting AdhesivePrimer for Aluminum Alloys to Be Adhesively Bonded inHoneycomb Shelter PanelsE874
10、Practice for Adhesive Bonding of Aluminum Facingsto Nonmetallic Honeycomb Core for Shelter PanelsE990 Specification for Core-Splice Adhesive for Honey-comb Sandwich Structural PanelsE1749 Terminology Relating to Rigid Wall RelocatableSheltersF501 Test Method for Aerospace Materials Response toFlame,
11、 with Vertical Test Specimen (for Aerospace Ve-hicles Standard Conditions) (Withdrawn 1998)32.2 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, Plat
12、e and Sheet2.4 Military Standards:5MIL-STD-105 Sampling Procedures and Tables for Inspec-tion by AttributesMIL-STD-129 Marking for Shipment and StorageMIL-STD-401 Sandwich Constructions and Core Materials;General Test Methods1This specification is under the jurisdiction of ASTM Committee E06 onPerfo
13、rmance of Buildingsand is the direct responsibility of Subcommittee E06.53 onMaterials and Processes for Durable Rigidwall Relocatable Structures.Current edition approved Oct. 1, 2013. Published February 2014. Originallyapproved in 1986. Last previous edition approved in 2008 as E1091 08. DOI:10.152
14、0/E1091-13.2For referenced ASTM standards, 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.3The last approved version of this historical stan
15、dard is referenced onwww.astm.org.4Available from Federal Aviation Administration (FAA), 800 IndependenceAve., SW, Washington, DC 20591, http:/www.faa.gov.5Available from DLA Document Services, Building 4/D, 700 Robbins Avenue,Philadelphia, PA 19111-5094, http:/quicksearch.dla.mil/.Copyright ASTM In
16、ternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12.5 TAPPI Standard:6T 435-SU-68 Test Method for Hydrogen Ion Concentrationof Paper Extracts, Hot Extraction Method2.6 Other Publications:Uniform Freight Classification7National Motor Freight Classificati
17、on83. Terminology3.1 DefinitionsSee Terminologies E631 and E1749 fordefinitions of terms used in this specification.3.2 Descriptions of Terms Specific To This Standard:3.2.1 block, na single production unit of honeycombbefore slicing.3.2.2 cell size, nthe average distance between node bonds,measured
18、 along the W direction (Fig. 1), for at least 60 cells,selected at random in groups containing 10 adjacent cells.3.2.3 core material, na slice or sheet cut from a produc-tion block that is used in a honeycomb sandwich panel. Theorientation of the cells in the honeycomb core material asproduced is sh
19、own in Fig. 1. The honeycomb core materialsexhibit anisotropic behavior, therefore the following notation isused:L = ribbon direction or longitudinal direction of core,W = expanded direction or transverse direction of core,T = core thickness or depth, andN = bonded portion of the honeycomb flat shee
20、t 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 honeycomb of thesame type produced during consecutive operating or workingdays using the same basic materials and operating conditions.3.2.
21、6 sheet, na slice of honeycomb cut from a productionblock.4. Classification4.1 Five types of nonmetallic honeycomb material arespecified. Their required properties are given in Section 6 andin Table 1.5. Ordering Information5.1 Procurement DocumentsPurchasers shall select any ofthe desired options o
22、ffered herein and the procurement docu-ments shall specify the following:5.1.1 Title, number, and date of this specification.5.1.2 Type of honeycomb required (see Section 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 require
23、d (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 arrangements for examination,test, and approval of the first article.6Available from Technical Association of the Pulp and Paper Industry (TAP
24、PI),15 Technology Parkway South, Norcross, GA 30092, http:/www.tappi.org.7Available from National Railroad Freight Committee (NRFC), 7001 WestonParkway, Suite 200, Cary, NC 27513.8Available from National Motor Freight Traffic Association, Inc. (NMFTA),1001 N. Fairfax St., Suite 600, Alexandria, VA 2
25、2314, http:/www.nmfta.org.FIG. 1 Orientation of Cells in Honeycomb-Core MaterialE1091 1326. Materials and Manufacture6.1 MaterialsMaterials shall be as specified herein for thetype ordered and shall comply with all provisions of thisspecification for this type.6.2 ConfigurationThe honeycomb material
26、 (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 sizeshall not exceed 0.5 in. (12.5 mm).6.3 Flame ResistanceThe honeycomb core material shallmeet the foll
27、owing 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 shall not extend into undam-aged area of core material.6.4 DimensionsUsing the methods specified in
28、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 of the honeycomb core materialshall be as specified in Table 2. The cell size shall not varymore
29、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 Properties:6.7.1 Physical and MechanicalThe physical and mechani-cal properties of the honeycomb materi
30、al 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 1.6.7.3 Fungus ResistanceWhen the fungus resistance isdetermined as specified, the compressive streng
31、th of thehoneycomb shall meet the requirements listed in Table 1.6.8 DensityThe density of the honeycomb material, deter-mined as specified, shall not exceed the values shown in Table1 and shall be within 610 % of the manufacturers specifieddensity.6.9 WorkmanshipThe honeycomb core material shall be
32、free 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.6.10 Thermal ResistanceAt the request of the purchaser,the thermal resistance, determined as specif
33、ied, 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.TABLE 1 Honeycomb-Core Material PropertiesType Type I Type II Type III Type IV Type VMaximum density, lb/f
34、t3(kg/m3) 5.5 (88) 4.4 (70) 3.3 (53) 4.4 (70) 3.3 (53)pH, pHunits 7.00.5 7.00.5 7.00.5 6.00.5 6.00.5Compressive 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) 163 (1.13) 98 (0.68)At elevated temperatureD394 (2.72) 278 (1.9
35、2) 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) 85 (0.59)TW core orientationB130 (0.90) 116 (0.80) 65 (0.45)
36、 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 (1.60) 306 (2.11) 231 (1.60)Brittleness/Impact:Drop height, m
37、in, 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 2F (23 1C) unless otherwise stated herein. Shear tests shall be conducted with the coreoriented in the TL
38、 and TW planes (Fig. 1).BAt equilibrium with 73 2F (23 1C), and 504%RH.CAfter soaking in water at 70 5F (21.1 3C) for 48 h with perforated facings.DAfter heating for 30 min at, and tested at, 176 5F (80 3C).EValues for compressive strength shall be not less than 85 % of the dry compressive strength
39、values for Types I, II, and III and 80 % for Types IV and V.FTested at 73 2F (23 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 TolerancesDimensionsTolerance, in. (mm)plus minusLength 2.0 (50.8) 0 (0)Width 1.0 (25.4
40、) 0 (0)Thickness 0.010 (0.254) 0.010 (0.254)E1091 1337. Test Methods7.1 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 o
41、f73 6 2F (23 6 1C) and 50 6 4 % relative humidity (RH).(See Specification E865.)7.2 DensityTest the density of the honeycomb material forcompliance with the requirements given in Table 1. Determinethe density using the core density method of MIL-STD-401using two specimens, each at least 2.2 ft2(0.2
42、m2) in area.Condition the specimens as specified for at least 48 h. Recordeach individual density value. Determine the average densityvalue of the two specimens. The test is failed if any averagedensity value does not meet the requirements of Table 1 and6.8.7.3 Honeycomb Core ShearThe L by W by I di
43、mensionsof 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 5052H34 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. Theadhe
44、sive used for bonding the specimen shall conform toSpecification E865.7.3.1 WetSoak twelve specimens under a 12-in. (3.0 kPa)head of water at 70 6 5F (21 6 3C) for at least 48 h. Whenperforated skins are bonded to the core, clear the perforationsof adhesive so that there is at least one hole into ea
45、ch cellthrough each skin. After removal from the water, shake thebonded specimens to remove excess water. Then test thebonded specimens in accordance with the Sandwich 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
46、 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). Record allindividual shear strength values for each plane. The test isfailed if two or more of the six values of each plane do not meetthe r
47、equirements 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 7.3.1. At the optionof the supplier, the skins specified in 7.3 do not necessarilyhave to be perforated. Record all individual shear strengt
48、hvalues 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 Table 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
49、). 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 B209). The perforated holesshall be 0.13 in. (3.2 mm) in diameter with 0.19 in. (4.8 mm)staggered centers. The adhesive used for bonding the specimenshall conform to Specification E865.7.4.1 WetSoak six specimens under a 12-in. (3.0 kPa)head of water at 70 6 5F (21 6 3C) for at least 48 h. Whenperforated skins are bonded to the core, cl
