ASTM_E_1922_-_04_2015.pdf

Designation:E192204(Reapproved 2015)Standard Test Method forTranslaminar Fracture Toughness of Laminated andPultruded Polymer Matrix Composite Materials1This standard is issued under the fixed designation E1922;the number immediately following the designation 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.Scope1.1 This test method covers the determination of translami-nar fracture toughness,KTL,for laminated and pultrudedpolymer matrix composite materials of various ply orientationsusing test results from monotonically loaded notched speci-mens.1.2 This test method is applicable to room temperaturelaboratory air environments.1.3 Composite materials that can be tested by this testmethod are not limited by thickness or by type of polymermatrix or fiber,provided that the specimen sizes and the testresults meet the requirements of this test method.This testmethod was developed primarily from test results of variouscarbon fiber epoxy matrix laminates and from additionalresults of glass fiber epoxy matrix,glass fiber-polyestermatrix pultrusions and carbon fiber bismaleimide matrixlaminates(1-4,5,6).21.4 A range of eccentrically loaded,single-edge-notchtension,ESE(T),specimen sizes with proportional planardimensions is provided,but planar size may be variable andadjusted,with associated changes in the applied test load.Specimen thickness is a variable,independent of planar size.1.5 Specimen configurations other than those contained inthis test method may be used,provided that stress intensitycalibrations are available and that the test results meet therequirements of this test method.It is particularly importantthat the requirements discussed in 5.1 and 5.4 regardingcontained notch-tip damage be met when using alternativespecimen configurations.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 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 to determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D883 Terminology Relating to PlasticsD3039/D3039M Test Method for Tensile Properties of Poly-mer Matrix Composite MaterialsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD5528 Test Method for Mode I Interlaminar Fracture Tough-ness of Unidirectional Fiber-Reinforced Polymer MatrixCompositesE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE83 Practice for Verification and Classification of Exten-someter SystemsE399 Test Method for Linear-Elastic Plane-Strain FractureToughness KIcof Metallic MaterialsE1823 Terminology Relating to Fatigue and Fracture Testing3.Terminology3.1 Definitions:3.1.1 Terminology E6,E1823,and D3878 are applicable tothis test method.3.2 Definitions of Terms Specific to This Standard:3.2.1 notch-mouth displacement,VnLthe Mode I(alsocalled opening mode)component of crack or notch displace-ment due to elastic and permanent deformation.The displace-ment is measured across the mouth of the notch on thespecimen edge(see Fig.1).3.2.2 notch length,anLthe distance from a referenceplane to the front of the machined notch.The reference plane1This test method is under the jurisdiction of ASTM Committee E08 on Fatigueand Fracture and is the direct responsibility of Subcommittee E08.05 on CyclicDeformation and Fatigue Crack Formation.Current edition approved May 1,2015.Published August 2015.Originallyapproved in 1997.Last previous edition approved in 2010 as E192204(2010)1.DOI:10.1520/E1922-04R15.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For 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 Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 depends on the specimen form,and normally is taken to beeither the boundary,or a plane containing either the load line orthe centerline of a specimen or plate.The reference plane isdefined prior to specimen deformation(see Fig.2).3.2.3 normalized notch size,an/W ndthe ratio of notchlength,an,to specimen width,W.3.2.4 For additional information,see Terminology D883and Test Methods D3039/D3039M,D5229/D5229M,andD5528.4.Summary of Test Method4.1 This test method involves tension testing of eccentri-cally loaded,single-edge-notch,ESE(T)