1、Designation: E 1091 03Standard 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 (e) 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 honeycom
3、b 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 t
6、heresponsibility 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:B 209 Specification for Aluminum and Aluminum-AlloySheet and Plate2C 177 Test Method f
7、or Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate Apparatus3C 366 Test Methods for Measurement of Thickness ofSandwich Cores4C 481 Test Method for Laboratory Aging of SandwichConstructions4C 518 Test Method for Steady-State Heat Flux Measure
8、-ments and Thermal Transmission Properties by Means ofthe Heat Flow Meter Apparatus3D 3951 Practice for Commercial Packaging5E 380 Practice for Use of the International System of Units(SI) (the Modernized Metric System)6E 864 Practice for Surface Preparation of Aluminum Alloysto be Adhesively Bonded
9、 in Honeycomb Shelter Panels7E 865 Specification for Structural Film Adhesives for Hon-eycomb Sandwich Panels6E 866 Specification for Corrosion-Inhibiting AdhesivePrimer for Aluminum Alloys to be Adhesively Bonded inHoneycomb Shelter Panels7E 874 Practice for Adhesive Bonding of Aluminum Facingsto N
10、onmetallic Honeycomb Core for Shelter Panels7E 990 Specification for Core-Splice Adhesive for Honey-comb Sandwich Shelter Panels7E 1749 Terminology of Rigid Wall Relocatable Shelters7F 501 Test Method for Aerospace Materials Response toFlame, with Vertical Test Specimen (For Aerospace Ve-hicles Stan
11、dard Conditions)82.2 Federal Aviation Regulation:FAR 25.853(a) Compartment Interiors92.3 Federal Standards:FED-STD-191A Textile Test Methods10QQ-A-250/8 Aluminum Alloy 5052, Plate and Sheet10QQ-A-250/11 Aluminum Alloy 6061, Plate and Sheet102.4 Military Standards:MIL-STD-105 Sampling Procedures and
12、Tables for Inspec-tion by Attributes10MIL-STD-129 Marking for Shipment and Storage10MIL-STD-401 Sandwich Constructions and Core Materials;General Test Methods102.5 TAPPI Standard:1This specification is under the jurisdiction of ASTM Committee E06 onPerformance of Building Constructions and is the di
13、rect responsibility of Subcom-mittee E06.53 on Materials and Processes for Durable Rigidwall RelocatableStructures.Current edition approved April 10, 2003. Published May 2003. Originallyapproved in 1986. Last previous edition approved in 1998 as E 1091 98.2Annual Book of ASTM Standards, Vol 02.02.3A
14、nnual Book of ASTM Standards, Vol 04.06.4Annual Book of ASTM Standards, Vol 15.03.5Annual Book of ASTM Standards, Vol 15.09.6Annual Book of ASTM Standards, Vol 14.02.7Annual Book of ASTM Standards, Vol 04.11.8Annual Book of ASTM Standards, Vol 04.07.9Available from Federal Aviation Agency, Office of
15、 Aviation Safety, 800Independence Ave., SW, Washington, DC 20591.10Available from Standardization Documents Order Desk, Bldg. 4 Section D,700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Un
16、ited States.T 435-SU-68 Test Method for Hydrogen Ion Concentrationof Paper Extracts, Hot Extraction Method112.6 Other Publications:Uniform Freight Classification12National Motor Freight Classification13ANSI/ASQC Z1.4 1993, Sampling Procedures and Tablesfor Inspection by Attributes143. Terminology3.1
17、 DefinitionsSee Terminology E 1749 for definitions ofterms 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 nodebonds, measured along the W direction (Fig. 1
18、), 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 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 c
19、ore materialsexhibit anisotropic behavior, therefore the following notation isused:L = ribbon direction or longitudinal direction of core,W = expanded direction or transverse direction of core, andT = core thickness or depth, andN = bonded portion of the honeycomb flat sheet material; thehoneycomb c
20、ells 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.3.2.6 sheet, na slice of honey
21、comb cut from a productionblock.4. Classification4.1 Five types of nonmetallic honeycomb material arespecified. Their required properties are given in Section 6 andin Table 1.4.1.1 Type Ihoneycomb for use in panels which arerequired to have a high load-carrying capability that could notbe adequately
22、 met using any of the other types.4.1.2 Type IIhoneycomb for use in panels which arerequired to have a load-carrying capability that could not beadequately met by using materials of any of Types III, IV, or V.4.1.3 Type IIIhoneycomb for general use in panels wherethe higher performances of Types I,
23、II, and IV materials are notrequired.4.1.4 Type IVhoneycomb similar to Type II but withslightly lower performance.4.1.5 Type Vhoneycomb similar to Type III but withslightly lower performance.11Available from the Technical Association of the Pulp and Paper Industry, 1Dunwoody Park, Atlanta, GA 30341.
24、12Available from the Uniform Classification Committee, Room 1106, 222 S.Riverside Plaza, Chicago, IL 60606.13Available from the American Trucking Associations, Inc., Traffic Department,1616 P St., NW, Washington, DC 20036.14Available from the American Society for Quality Control, 611 E. WisconsinAve
25、., Milwaukee, WI 53202.FIG. 1 Orientation of Cells in Honeycomb-Core MaterialE 1091 0325. 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 speci
26、fication.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 required (see 3.3).5.1.6 Whether qualification is necessary (see 8.2.2).5.2 When a first article sample is required, specif
27、ic instruc-tions shall be given regarding arrangements for examination,test, and approval of the first article.6. 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 Configuration
28、The 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 sizeshall not exceed 0.5 in (12.5 mm).6.3 Flame ResistanceThe honeycomb core materi
29、al 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 shall not extend into undam-aged area of core material.6.4 DimensionsUsing the m
30、ethods 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 of the honeycomb core materialshall be as specified in Table 2. The cell size
31、 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 Properties:6.7.1 Physical and MechanicalThe physical and me-chanical properties of t
32、he 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 1.6.7.3 Fungus ResistanceWhen the fungus resistance isdetermined as specified, the
33、 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 within 610 % of the manufacturersspecified density.6.9 WorkmanshipThe honeycomb cor
34、e 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.TABLE 1 Honeycomb-Core Material PropertiesType Type I Type II Type III Type IV Ty
35、pe 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) 163 (1.13) 98 (0.68)At e
36、levated 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 footnoteEShear strength,Apsi (MPa):Dry, minTL core orientationB218 (1.50) 218 (1.50) 116 (0.80) 180 (1.24) 85 (0.59)TW core orien
37、tationB130 (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 (1.60) 306 (2.11) 231 (
38、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 herein. Shear tests shall be c
39、onducted with the coreoriented 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 compressive strength sha
40、ll 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 TolerancesDimensionsTolera
41、nce, 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)E 1091 0336.10 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
42、purchaser, the honeycomb shear modulus andcompressive modulus, determined as specified, shall be re-ported.7. 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 manufacture
43、and conditioned and tested under standard conditions of73 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 requirements given in Table 1.Determine the density using the core density method ofMIL-
44、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. The test is failed if anyaverage density value does not meet the requirements of Ta
45、ble1 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 5052H34 or 6061T6 alu-minum alloy. The perforated holes shall be 0.13 in (3.2 mm) indiamet
46、er with 0.19 in (4.8 mm) staggered centers. The adhe-sive used for bonding the specimen shall conform to Specifi-cation 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) for at least 48 h. Whenperforated skins are bonded to the core, clear the perforation
47、sof 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 Sandwich Flexuretest method of MIL-STD-401 using a 12-in (305-mm) span,2-point loading
48、 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). Record allindividual shear strength values for each plane. The test isfailed if two or
49、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 7.3.1. 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 Table 1.7.4 Honeycomb Core C
