ASTM_D_5934_-_02.pdf

Designation:D 5934 02Standard Test Method forDetermination of Modulus of Elasticity for Rigid and Semi-Rigid Plastic Specimens by Controlled Rate of LoadingUsing Three-Point Bending1This standard is issued under the fixed designation D 5934;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the use of controlled rate ofloading mechanical instrumentation for gathering and reportingthe modulus of elasticity of thermoplastic and thermosettingresins and composite systems in the form of rectangular barsmolded directly or cut from sheets,plates,or molded shapes.The data generated,using three-point bending techniques,maybe used to identify the thermomechanical properties of aplastics material or composition using a controlled rate ofloading mechanical instrument.2Results obtained from this testmethod may or may not be comparable to results obtainedusing D 790.1.2 This test method is intended to provide a means fordetermining the modulus of elasticity within the linear regionof the stress-strain curve(see Fig.1).This test is conducted atstandard temperature and pressure.1.3 Apparent discrepancies may arise in results obtainedunder differing experimental conditions.These apparent differ-ences from results observed in another study can usually bereconciled,without changing the observed data,by reporting infull(as described in this test method)the conditions underwhich the data were obtained.1.4 The values stated in SI units are to be regarded as thestandard.The values stated in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1There is no similar or equivalent ISO standard.2.Referenced Documents2.1 ASTM Standards:D 618 Practice for Conditioning Plastics for Testing3D 638 Test Method for Tensile Properties of Plastics3D 883 Terminology Relating to Plastics3D 1999 Guide for the Selection of Specimens and TestParameters from ISO/IEC Standards4D 4092 Terminology for Plastics:Dynamic MechanicalProperties5E 177 Practice for the Use of the Terms Precision and Biasin ASTM Test Methods63.Terminology3.1 Definitions:Definitions of terms applying to these testmethods appear in Terminologies D 883 and D 4092,andAnnex A1 and Annex A2 of Test Method D 638.4.Summary of Test Method4.1 A specimen of rectangular cross section is tested inflexure as a beam.The bar rests on two supports and is loadedby means of a loading nose midway between the supports.Thetest specimen of known geometry is placed under mechanicallinear displacement at isothermal conditions by using a con-trolled rate of loading.The modulus of elasticity is measuredusing three-point bending.5.Significance and Use5.1 This test method provides a simple means of character-izing the mechanical behavior of plastics materials using verysmall amounts of material.The data obtained may be used forquality control,research and development,and establishmentof optimum processing conditions.5.2 Mechanical testing provides a sensitive test method fordetermining mechanical characteristics by measuring themodulus of elasticity.1This test method is under the jurisdiction ofASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.Current edition approved April 10,2002.Published June 2002.Originallypublished as D 5934 96.Last previous edition D 5934 96.2This apparatus is available from the Perkin-Elmer Corporation,761 MainAvenue,Norwalk,CT 06859-0256.3Annual Book of ASTM Standards,Vol 08.01.4Discontinued;see 1999 Annual Book of ASTM Standards,Vol 08.01.5Annual Book of ASTM Standards,Vol 08.02.6Annual Book of ASTM Standards,Vol 14.02.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTE2Materials that are suspected to be too anisotropic may not besuitable for this test method.5.3 This test method can be used to assess:5.3.1 The effects of processing treatment,5.3.2 Relative resin behavioral properties,including cure,5.3.3 The effects of substrate types and orientation(fabri-cation)on modulus,and5.3.4 The effects of formulation additives that might affectprocessability or performance.6.Interferences6.1 Since small test specimen geometries are used,it isessential that the specimens be representative of the polymericmaterial being tested.7.Apparatus7.1 The function of the apparatus is to hold a rectangulartest specimen of a polymeric material system so that thematerial acts as the elastic and dissipative element in amechanically driven linea