1、Designation:D502415Standard Test Method forPlastics:Dynamic Mechanical Properties:In Compression1This standard is issued under the fixed designation D5024;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber 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 outlines the use of dynamic mechanicalinstrumentation for determining and reporting the viscoelasticproperties of thermopla
3、stic and thermosetting resins as well ascomposite systems in the form of cylindrical specimensmolded directly or cut from sheets,plates,or molded shapes.The compression data generated may be used to identify thethermomechanical properties of a plastics material or compo-sition using a variety of dyn
4、amic mechanical instruments.1.2 This test method is intended to provide a means fordetermining the thermomechanical properties(as a function ofa number of viscoelastic variables)for a wide variety of plasticmaterials using nonresonant,forced-vibration techniques asoutlined in Practice D4065.Plots of
5、 the elastic(storage)modulus,loss(viscous)modulus,complex modulus,and tandelta as a function of frequency,time,or temperature areindicative of significant transitions in the thermomechanicalperformance of the polymeric material system.1.3 This test method is valid for a wide range of frequencies,typ
6、ically from 0.01 to 100 Hz.1.4 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 meth
7、od)the conditions underwhich the data were obtained.1.5 Due to possible instrumentation compliance,the datagenerated are intended to indicate relative and not necessarilyabsolute property values.1.6 Test data obtained by this test method are relevant andappropriate for use in engineering design.1.7
8、The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.8 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-priat
9、e safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD4000 Classification System for Specifying Plastic
10、 Materi-alsD4065 Practice for Plastics:Dynamic Mechanical Proper-ties:Determination and Report of ProceduresD4092 Terminology for Plastics:Dynamic MechanicalProperties3.Terminology3.1 DefinitionsFor definitions applicable to this testmethod refer to Terminology Standard D4092.4.Summary of Test Metho
11、d4.1 This test method covers the determination of the com-pressive modulus of both solid and cellular plastics usingdynamic mechanical techniques.A test specimen of cylindricalcross section is tested in dynamic compression.The specimenmay be secured using appropriate grip fixtures or simplypositione
12、d between two parallel,flat plates or disks.Thespecimen of known geometry is placed in mechanical,lineardisplacement at fixed frequencies with a linear temperaturevariation or at variable frequencies at isothermal conditions.The elastic moduli or loss moduli,or both,of the polymericmaterial system a
13、re measured in compression.NOTE2The particular method for measurement of the elastic and lossmoduli and tan delta depends upon the individual instruments operatingprinciples.5.Significance and Use5.1 This test method provides a simple means of character-izing the thermomechanical behavior of plastic
14、 compositionsusing very small amounts of material.The data obtained can be1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.Current edition approved July 1,2015.Published July 2015.Originally
15、approvedin 1989.Last previous edition approved in 2007 as D5024-07.DOI:10.1520/D5024-15.2For 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 pa
16、ge 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 used for quality control and/or research and developmentpurposes.For some classes of materials,such as thermosets,itcan also be used to establish optimum processing conditions.5.2 Dynamic mechanical testing provides a sensitivemethod for determining thermomechanical characteristics bymeasuring the elas
