1、Designation:C365/C365M16Standard Test Method forFlatwise Compressive Properties of Sandwich Cores1This standard is issued under the fixed designation C365/C365M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revisio
2、n.A number in parentheses indicates the year of last reapproval.A superscript 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 test method covers the determination of comp
3、res-sive strength and modulus of sandwich cores.These propertiesare usually determined for design purposes in a directionnormal to the plane of facings as the core would be placed ina structural sandwich construction.The test procedures pertainto compression in this direction in particular,but also
4、can beapplied with possible minor variations to determining compres-sive properties in other directions.Permissible core materialforms include those with continuous bonding surfaces(such asbalsa wood and foams)as well as those with discontinuousbonding surfaces(such as honeycomb).1.2 This test metho
5、d does not cover the determination ofcompressive core crush properties.Reference Test MethodD7336/D7336M for determination of static energy absorptionproperties of honeycomb sandwich core materials.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.
6、The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3.1 Within the text the inch-pound units are shown inbrackets.1.4 This standard does not pu
7、rport to address 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:2C271/
8、C271M Test Method for Density of Sandwich CoreMaterialsD883 Terminology Relating to PlasticsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD7336/D7336M Test Method for Static Energy
9、 AbsorptionProperties of Honeycomb Sandwich Core MaterialsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE1
10、77 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and Statistics3.Terminology3.1 DefinitionsTerminology D3878 defines terms relatingto high-modulus fibers and their composites,as well as termsrelating to sandwich constructions.Terminology D88
11、3 definesterms relating to plastics.Terminology E6 defines termsrelating to mechanical testing.Terminology E456 and PracticeE177 define terms relating to statistics.In the event of aconflict between terms,Terminology D3878 shall have prece-dence over the other terminologies.3.2 Symbols:3.2.1 Across-
12、sectional area of a test specimen3.2.2 CVcoefficient of variation statistic of a samplepopulation for a given property(in percent)3.2.3 Ezfcflatwise compressive modulus3.2.4 Fzfcuultimate flatwise compressive strength3.2.5 Fzfc 0.02flatwise compressive strength at 2%LVDT/compressometer deflection3.2
13、.6 Pmaxmaximum force carried by test specimen beforefailure3.2.7 P0.02force carried by test specimen at 2%LVDT/compressometer deflection3.2.8 Sn1standard deviation statistic of a sample popula-tion for a given property1This test method is under the jurisdiction of ASTM Committee D30 onComposite Mate
14、rials and is the direct responsibility of Subcommittee D30.09 onSandwich Construction.Current edition approved May 15,2016.Published June 2016.Originallyapproved in 1955.Last previous edition approved in 2011 as C365/C365M 11A.DOI:10.1520/C0365_C0365M-16.2For referenced ASTM standards,visit the ASTM
15、 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3
16、.2.9 tthickness of a test specimen3.2.10 x1test result for an individual specimen from thesample population for a given property3.2.11 x mean or average(estimate of mean)of a samplepopulation for a given property3.2.12 LVDT or compressometer deflection3.2.13 zfc0.02flatwise compressive stress at 2%LVDT/compressometer deflection4.Summary of Test Method4.1 This test method consists of subjecting a sandwich coreto a uniaxial compressive force normal to the plane of thefacings as the core would be p