1、Designation:D3518/D3518M18Standard Test Method forIn-Plane Shear Response of Polymer Matrix CompositeMaterials by Tensile Test of a 645 Laminate1This standard is issued under the fixed designation D3518/D3518M;the number immediately following the designation indicates theyear of original adoption or
2、,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.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 T
3、his test method determines the in-plane shear responseof polymer matrix composite materials reinforced by high-modulus fibers.The composite material form is limited to acontinuous-fiber-reinforced composite 645 laminate capableof being tension tested in the laminate x direction.1.2 The values stated
4、 in either SI 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
5、text,the inch-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,health,and environmental practices and deter-mine the applicabil
6、ity of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the Wor
7、ld Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD3039/D3039M Test Method for Tensile Properties of Poly-mer Matrix Composite MaterialsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for Mo
8、istureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsE6 Terminology Relating to Methods of Mechanical TestingE111 Test Method for Youngs Modulus,Tangent Modulus,and Chord ModulusE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Ter
9、minology Relating to Quality and Statistics3.Terminology3.1 DefinitionsTerminology D3878 defines terms relatingto high-modulus fibers and their composites.TerminologyD883 defines terms relating to plastics.Terminology E6 definesterms relating to mechanical testing.Terminology E456 andPractice E177 d
10、efine terms relating to statistics.In the event ofa conflict between terms,Terminology D3878 shall haveprecedence over the other standards.3.2 Definitions of Terms Specific to This Standard:NOTE1If the term represents a physical quantity,its analyticaldimensions are stated immediately following the
11、term(or letter symbol)infundamental dimension form,using the following ASTM standard sym-bology for fundamental dimensions,shown within square brackets:Mfor mass,L for length,T for time,for thermodynamic temperature,and nd for nondimensional quantities.Use of these symbols is restrictedto analytical
12、 dimensions when used with square brackets,as the symbolsmay have other definitions when used without the brackets.3.2.1 645 laminatein laminated composites,a balanced,symmetric lay-up composed only of+45 plies and 45 plies.(See also ply orientation.)3.2.2 balanced,adjin laminated composites,having,
13、forevery off-axis ply oriented at+,another ply oriented at thatis of the same material system and form.3.2.3 lamina,npl.laminae,in laminated composites,asingle,thin,uniform layer that is the basic building block of alaminate.(Syn.ply).3.2.4 materialcoordinatesystem,ninlaminatedcomposites,a 123 Carte
14、sian coordinate system describing theprinciple material coordinate system for a laminated material,where the 1-axis is aligned with the ply principal axis,as1This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.04
15、 onLamina and Laminate Test Methods.Current edition approved Nov.1,2018.Published November 2018.Originallyapproved in 1976.Last previous edition approved in 2013 as D3518/D3518M 13.DOI:10.1520/D3518_D3518M-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer
16、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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the Wo
