ASTM_D_6641_-_D_6641M_-_16e2.pdf

Designation:D6641/D6641M162Standard Test Method forCompressive Properties of Polymer Matrix CompositeMaterials Using a Combined Loading Compression(CLC)Test Fixture1This standard is issued under the fixed designation D6641/D6641M;the number immediately following the designation indicates theyear of original adoption or,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.1NOTEA label in Figure 3 was corrected editorially in March 2017.2NOTEEditorial corrections were made to the adjunct information in March 2021.1.Scope1.1 This test method determines the compressive strengthand stiffness properties of polymer matrix composite materialsusing a combined loading compression(CLC)(1)2test fixture.This test method is applicable to general composites that arebalanced and symmetric.The specimen may be untabbed(Procedure A)or tabbed(Procedure B),as required.Onerequirement for a successful test is that the specimen ends donot crush during the test.Untabbed specimens are usuallysuitable for use with materials of low orthotropy,for example,fabrics,chopped fiber composites,and laminates with a maxi-mum of 50%0 plies,or equivalent(see 6.4).Materials ofhigher orthotropy,including unidirectional composites,typi-cally require tabs.1.2 The compressive force is introduced into the specimenby combined end-and shear-loading.In comparison,TestMethod D3410/D3410M is a pure shear-loading compressiontest method and Test Method D695 is a pure end-loading testmethod.1.3 Unidirectional(0 ply orientation)composites as well asmulti-directional composite laminates,fabric composites,chopped fiber composites,and similar materials can be tested.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.Within the test theinch-pound units are shown in brackets.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.NOTE1Additional procedures for determining the compressive prop-erties of polymer matrix composites may be found in Test MethodsD3410/D3410M,D5467/D5467M,and D695.1.5 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 applicability of regulatory limitations prior to use.1.6 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 World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D695 Test Method for Compressive Properties of RigidPlasticsD883 Terminology Relating to PlasticsD3410/D3410M Test Method for Compressive Properties ofPolymer Matrix Composite Materials with UnsupportedGage Section by Shear LoadingD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD5379/D5379M Test Method for Shear Properties of Com-posite Materials by the V-Notched Beam MethodD5467/D5467M Test Method for Compressive Properties ofUnidirectional Polymer Matrix Composite Materials Us-ing a Sandwich BeamD5687/D5687M Guide for Preparation of Flat CompositePanels with Processing Guidelines for Specimen Prepara-tion1This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.04 onLamina and Laminate Test Methods.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 2001.Last previous edition approved in 2014 as D6641/D6641M-14.DOI:10.1520/D6641_D6641M-16E02.2Boldface numbers in parentheses refer to the list of references at the end of thistest method.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 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 World Trade Organization Technical Barriers to Trade(TBT)Committee.1E4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,th