1、Designation:C297/C297M16Standard Test Method forFlatwise Tensile Strength of Sandwich Constructions1This standard is issued under the fixed designation C297/C297M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revis
2、ion.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 determines the flatwise tensil
3、e strengthof the core,the core-to-facing bond,or the facing of anassembled sandwich panel.Permissible core material formsinclude those with continuous bonding surfaces(such as balsawood and foams)as well as those with discontinuous bondingsurfaces(such as honeycomb).1.2 The values stated in either S
4、I units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not exact equivalents;therefore,each systemmust be used independently of the other.Combining valuesfrom the two systems may result in nonconformance with thestandard.1.2.1 Within the text the inc
5、h-pound units are shown inbrackets.1.3 This standard does not purport 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 limitati
6、ons prior to use.2.Referenced Documents2.1 ASTM Standards:2C271/C271M Test Method for Density of Sandwich CoreMaterialsD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD2584 Test Method for Ignition Loss of Cured Rei
7、nforcedResinsD2734 Test Methods for Void Content of Reinforced PlasticsD3039/D3039M Test Method for Tensile Properties of Poly-mer Matrix Composite MaterialsD3171 Test Methods for Constituent Content of CompositeMaterialsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureA
8、bsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite 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 Charac
9、teristic of aLot or ProcessE177 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
10、constructions.Terminology D883 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 terminolog
11、ies.3.2 Symbols:3.2.1 Across-sectional area of a test specimen3.2.2 CVcoefficient of variation statistic of a samplepopulation for a given property(in percent)3.2.3 eedge tolerance between specimen and loadingblocks3.2.4 Fzftuultimate flatwise tensile strength3.2.5 Pmaxmaximum force carried by test
12、specimen beforefailure3.2.6 Sn-1 standard deviation statistic of a sample popula-tion for a given property3.2.7 xitest result for an individual specimen from thesample population for a given property3.2.8 x mean or average(estimate of mean)of a samplepopulation for a given property1This test method
13、is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.09 onSandwich Construction.Current edition approved April 1,2016.Published April 2016.Originallyapproved in 1952.Last previous edition approved in 2015 as C297/C297M 15).DOI:10.
14、1520/C0297_C0297M-16.2For 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.Copyright ASTM International,100 Barr Harbor
15、Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Summary of Test Method4.1 This test method consists of subjecting a sandwichconstruction to a uniaxial tensile force normal to the plane ofthe sandwich.The force is transmitted to the sandwich throughthick loading blocks,which are bo
16、nded to the sandwich facingsor directly to the core.4.2 The only acceptable failure modes for flatwise tensilestrength are those which are internal to the sandwich construc-tion.Failure of the loading block-to-sandwich bond is not anacceptable failure mode.5.Significance and Use5.1 In a sandwich panel,core-to-facing bond integrity isnecessary to maintain facing stability and permit load transferbetween the facings and core.This test method can be used toprovide information on the strength and qu