1、Designation:D806917aStandard Test Method forDetermining Flexural Modulus of Full Section PultrudedFiber Reinforced Polymer(FRP)Composite Members withDoubly Symmetric Cross Sections under Bending1This standard is issued under the fixed designation D8069;the number immediately following the designatio
2、n indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination
3、of FlexuralModulus of pultruded open and closed fiber reinforced polymer(FRP)composites of doubly symmetrical cross sections(sec-tions having geometric symmetry about both the major andminor axes)about their geometric centroid subjected to flexureand shear.This test method utilizes a three-point loa
4、dingsystem applied to a simply supported beam.1.2 The values stated in SI units are to be regarded as thestandard.The values provided in parentheses are for informa-tion only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibilit
5、y of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.NOTE1The is no known ISO equivalent to this standard.1.4 This international standard was developed in accor-dance with internatio
6、nally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D883 Terminolo
7、gy Relating to PlasticsD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD3878 Terminology for Composite MaterialsD4000 Classification System for Specifying Plastic Materi-alsD4762 Guide for Testing Polymer Matrix Composite Mate-rial
8、sE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1309 GuideforIdent
9、ificationofFiber-ReinforcedPolymer-Matrix Composite Materials in Databases(With-drawn 2015)3E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases(Withdrawn2015)3E2309/E2309M Practices for Verification of DisplacementMeasuring Systems and Devices Used in
10、Material TestingMachines3.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.In the event of a conflictbetween terms,Terminology D3
11、878 shall have precedenceover the other terminologies.3.2 Definitions of variables used in calculations as shown inSection 11 and 12 are as follows:P20%20%of estimated ultimate load,N(lbf)I=moment of inertia about the neutral axis,mm4(in.4)L=test span length,mm(in.)h=total height of test specimen,mm
12、(in.)P5%5%of estimated ultimate load,N(lbf)P=load value used to calculate E,N(lbf)=deflection value used to calculate E,mm(in.)20%deflection at 20%of estimated ultimate load,mm(in.)5%deflection at 5%of estimated ultimate load,mm(in.)1This test method is under the jurisdiction of ASTM Committee D20 o
13、n Plasticsand is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-ting Plastics.Current edition approved Dec.1,2017.Published January 2018.Originallyapproved in 2017.Last previous edition approved in 2017 as D806917.DOI:10.1520/D8069-17A.2For referenced ASTM standards,visit t
14、he 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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Change
15、s section appears at the end of this standardCopyright 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 o
16、n Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 E=Flexural modulus,MPa(psi)4.Summary of Test Method4.1 The full-scale specimen rests on two rounded solidmetal cylindrical supports or pivoted end supports and isloaded by means of a loading ram located midway between thesupports,as shown in Fig.1.The beam span-to-depth ratio(L/h)should be within the range of 20 L/h 32 to determi
