1、Designation:C363/C363M16Standard Test Method forNode Tensile Strength of Honeycomb Core Materials1This standard is issued under the fixed designation C363/C363M;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.1.Scope1.1 This test method covers the determination of the tensile-node bond strength of honeycomb core materials.1.2 The values stated in eithe
3、r SI units or inch-pound unitsare to be regarded separately as standard.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 This standard doe
4、s 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 limitations prior to use.2.Referenced Documents2.1 ASTM Standard
5、s:2D883 Terminology Relating to PlasticsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of M
6、echanical TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and Statistics3.Terminology3.1 DefinitionsTe
7、rminology D3878 defines terms relatingto high-modulus fibers and their composites,as well as termsrelating to sandwich constructions.Terminology D883 definesterms relating to plastics.Terminology E6 defines termsrelating to mechanical testing.Terminology E456 and PracticeE177 define terms relating t
8、o statistics.In the event of aconflict between terms,Terminology D3878 shall have prece-dence over the other Terminologies.3.2 Symbols:3.2.1 tensile node strength,MPa psi.3.2.2 Pultimate tensile force,N lb.3.2.3 binitial width of specimen,mm in.3.2.4 tthickness of specimen,mm in.3.2.5xsample mean(av
9、erage).3.2.6 Sn 1sample standard deviation.3.2.7 CVsample coefficient of variation(in percent).3.2.8 nnumber of specimens.3.2.9 x1measured or derived property.4.Summary of Test Method4.1 This test method consists of subjecting a honeycombconstruction to a uniaxial tensile force parallel to the plane
10、 ofthe honeycomb.The force is transmitted to the honeycombthrough pins,which are placed in cell rows on the top andbottom portions of one specimen.4.2 The only acceptable failure mode for tensile-node bondstrength is the tensile failure of the node-to-node honeycombbond within the body of the honeyc
11、omb specimen.Failure ofthe honeycomb material at the loading pin location is not avalid failure mode.5.Significance and Use5.1 The honeycomb tensile-node bond strength is a funda-mental property than can be used in determining whetherhoneycomb cores can be handled during cutting,machiningand forming
12、 without the nodes breaking.The tensile-nodebond strength is the tensile stress that causes failure of thehoneycomb by rupture of the bond between the nodes.It isusually a peeling-type failure.5.2 This test method provides a standard method of obtain-ing tensile-node bond strength data for quality c
13、ontrol,accep-tance specification testing,and research and development.1This test method 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.Ori
14、ginallyapproved in 1955.Last previous edition approved in 2015 as C363 09(2015).DOI:10.1520/C0363_C0363M-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
15、 Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Interferences6.1 System AlignmentExcessive bending will cause pre-mature failure.Every effort should be made to eliminate excessbending from the t
16、est system.Bending may occur as a result ofmisaligned grips,poor specimen preparation,or poor align-ment of the loading fixture.6.2 GeometrySpecific geometric factors that affect thetensile-node bond strength include cell geometry,cell size,cellwall thickness and,specimen dimensions(length,width andthickness).6.3 EnvironmentResults are affected by the environmentalconditions under which the tests are conducted.Specimenstested in various environments can exhibit significant differ-ences in both s