ASTM_D_2291_-_09.pdf

Designation:D229109Standard Practice forFabrication of Ring Test Specimens for Glass-ResinComposites1This standard is issued under the fixed designation D2291;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This practice is intended for use in the fabrication ofring-type test specimens to be used in the evaluation of themechanical properties of reinforcement and resins in a com-posite structure.The practice outlines the steps in the prepara-tion of the test specimens,including the final specimenmachining where applicable.Four final ring configurations areincluded.1.2 The values stated in either SI units of 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 nonconformancewith the standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this practice.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD2290 Test Method for Apparent Hoop Tensile Strength ofPlastic or Reinforced Plastic PipeD2344/D2344M Test Method for Short-Beam Strength ofPolymer Matrix Composite Materials and Their Laminates3.Terminology3.1 For definitions of terms which apply to this practice,seeTerminology D883.4.Significance and Use4.1 This practice provides a uniform procedure for fabricat-ing glass fiber/thermoset resin ring samples for use as testspecimens.Specimens so prepared can be used in Test MethodsD2290 and D2344/D2344M.5.Apparatus5.1 Winding MachineThe winding machine may consistof any adequate superstructure for mounting impregnatedreinforcement or components for application of resin to thereinforcement,tensioning the reinforcement,and collecting thewetted,tensioned material on a mold or mandrel of the desiredsize.5.2 Tension Measuring SystemAny device suitable formeasurement of the tension applied to the wetted reinforce-ment.The device shall be capable of measuring the tensionaccurately to within 65%.5.3 The single-ring fabrication mold on which the wettedreinforcement is collected shall be constructed as shown in Fig.1.For cylinder fabrication from which rings are to be cut,amandrel with the proper diameter fitted to a suitable windingmachine shall be used to collect the wetted reinforcement.Thesurfaces of the mold or mandrel that contact the ring specimensshall be coated or otherwise treated to prevent sticking of thering or cylinder in the mold or on the mandrel.5.4 Curing OvensOvens having adequate range in tem-perature to produce a fully cured specimen shall be availablefor use.Control of the curing-postcuring temperatures towithin 69F(65C)is required.6.Storage and Conditioning of Components6.1 Glass rovings and yarns for use in fabrication of ring testspecimens shall be stored in a dry place,not subject totemperature extremes,or as specified by the glass producer.Prior to use,the rovings shall be conditioned in accordance1This practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.18 on Reinforced ThermosettingPlastics.Current edition approved Sept.1,2009.Published September 2009.Originallyapproved in 1964.Last previous edition approved in 2003 as D2291-03.DOI:10.1520/D2291-09.2For 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 Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 with Procedure A of Practice D618,which requires 40 hours at23C 6 2C and a 50%relative humidity 610%.6.2 Resins to be used in the fabrication of ring test speci-mens shall be stored in closed containers at a temperaturespecified by the supplier.In addition,no resin shall be used thathas been stored for a period in excess of the shelf liferecommended by the supplier.Prior to fabrication of the testspecimen,the resin shall be heated as necessary to providesufficient lowering of the viscosity to produce good wetting ofthe reinforcement strand.6.3 Preimpregnated materials received for the preparation ofring test specimens shal