ASTM C480 C480M-2008(2015) Standard Test Method for Flexure Creep of Sandwich Constructions《夹层结构挠曲蠕变的标准试验方法》.pdf
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1、Designation: C480/C480M 08 (Reapproved 2015)Standard Test Method forFlexure Creep of Sandwich Constructions1This standard is issued under the fixed designation C480/C480M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of
2、 last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the creepcharacteristics and creep rate of flat sandwich constructionslo
3、aded in flexure, at any desired temperature. Permissible corematerial forms include those with continuous bonding surfaces(such as balsa wood and foams) as well as those withdiscontinuous bonding surfaces (such as honeycomb).1.2 The values stated in either SI units or inch-pound unitsare to be regar
4、ded separately as standard. Within the text theinch-pound units are shown in brackets. The values stated ineither SI units or inch-pound units are to be regarded separatelyas standard. The values stated in each system may not be exactequivalents; therefore, each system shall be used independentlyof
5、the other. Combining values from the two systems mayresult in non-conformance with 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 p
6、ractices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C274 Terminology of Structural Sandwich ConstructionsC393/C393M Test Method for Core Shear Properties ofSandwich Constructions by Beam FlexureD883 Terminology Relating to Plast
7、icsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD7249/D7249M Test Method for Facing Properties of Sand-wich Constructions by Long Beam FlexureE6 Terminology Relating to Methods of
8、 Mechanical TestingE122 Practice for Calculating Sample Size to Estimate, WithSpecified Precision, the Average for a Characteristic of aLot or ProcessE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE1309 Guide for Identifica
9、tion of Fiber-ReinforcedPolymer-Matrix Composite Materials in DatabasesE1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases3. Terminology3.1 DefinitionsTerminology D3878 defines terms relatingto high-modulus fibers and their composites. TerminologyC274
10、defines terms relating to structural sandwich construc-tions. Terminology D883 defines terms relating to plastics.Terminology E6 defines terms relating to mechanical testing.Terminology E456 and Practice E177 define terms relating tostatistics. In the event of a conflict between terms, TerminologyD3
11、878 shall have precedence over the other terminologydocuments.3.2 Symbols:3.2.1 Adistance between pivot point and point of appliedforce on the specimen3.2.2 bspecimen width3.2.3 Bdistance from pivot point to center of gravity of theloading arm3.2.4 ccore thickness3.2.5 CRIcreep rate at time, ii3.2.6
12、 dsandwich total thickness3.2.7 dinitial static deflection under the same load and atthe same temperature3.2.8 Dtotal deflection at time, t3.2.9 Ffapplied facing stress3.2.10 Fsapplied core shear stress3.2.11 Mdistance between point and weight point3.2.12 nnumber of specimens3.2.13 pmass of loading
13、plate and rod3.2.14 Papplied force1This specification is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.09 onSandwich Construction.Current edition approved July 1, 2015. Published August 2015. Originallyapproved in 1961. Last p
14、revious edition approved in 2008 as C480/C480M 08.DOI: 10.1520/C0480_C0480M-08R15.2For 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 pag
15、e onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.15 Slength of support span3.2.16 wmass of lever arm3.2.17 Wmass of weight (including tray mass)4. Summary of Test Method4.1 This test method consists of subjecti
16、ng a beam ofsandwich construction to a sustained force normal to the planeof the sandwich, using either a 3-point or a 4-point loadingfixture. Deflection versus time measurements are recorded.4.2 For long beam specimens conforming to Test MethodD7249/D7249M, the only acceptable failure modes for san
17、d-wich facesheet strength are those which are internal to one ofthe facesheets. Failure of the sandwich core or the core-to-facesheet bond preceding failure of one of the facesheets is notan acceptable failure mode for this specimen configuration.4.3 For short-beam specimens conforming to Test Metho
18、dC393/C393M, the only acceptable failure modes are core shearor core-to-facing bond. Failure of the sandwich facing preced-ing failure of the core or core-to-facing bond is not anacceptable failure mode for this specimen configuration.4.4 Careful post-test inspection of the specimen is requiredas fa
19、cing failure occurring in proximity to the loading pointscan be caused by local through-thickness compression or shearfailure of the core that precedes failure of the facing.5. Significance and Use5.1 The determination of the creep rate provides informa-tion on the behavior of sandwich constructions
20、 under constantapplied force. Creep is defined as deflection under constantforce over a period of time beyond the initial deformation as aresult of the application of the force. Deflection data obtainedfrom this test method can be plotted against time, and a creeprate determined. By using standard s
21、pecimen constructions andconstant loading, the test method may also be used to evaluatecreep behavior of sandwich panel core-to-facing adhesives.5.2 This test method provides a standard method of obtain-ing flexure creep of sandwich constructions for quality control,acceptance specification testing,
22、 and research and develop-ment.5.3 Factors that influence the sandwich construction creepresponse and shall therefore be reported include the following:facing material, core material, adhesive material, methods ofmaterial fabrication, facing stacking sequence and overallthickness, core geometry (cel
23、l size), core density, corethickness, adhesive thickness, specimen geometry, specimenpreparation, specimen conditioning, environment of testing,specimen alignment, loading procedure, speed of testing,facing void content, adhesive void content, and facing volumepercent reinforcement. Further, facing
24、and core-to-facingstrength and creep response may be different betweenprecured/bonded and co-cured facesheets of the same material.6. Interferences6.1 The interferences listed in Test Methods C393/C393Mand D7249/D7249M are also applicable to this test method.7. Apparatus7.1 Micrometers and CalipersA
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