ASTM D6641 D6641M-2001e1 Standard Test Method for Determining the Compressive Properties of Polymer Matrix Composite Laminates Using a Combined Loading Compression (CLC) Test Fixtu.pdf
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1、Designation: D 6641/D 6641M 01e1Standard Test Method forDetermining the Compressive Properties of Polymer MatrixComposite Laminates Using a Combined LoadingCompression (CLC) Test Fixture1This standard is issued under the fixed designation D 6641/D 6641M; the number immediately following the designat
2、ion 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 (e) indicates an editorial change since the last revision or reapproval.e1NOTEThe designation, D 6641/D 6641M, was ed
3、itorially corrected to be a dual standard in December 2001.1. Scope1.1 This test method establishes a procedure for determiningthe compressive strength and stiffness properties of polymermatrix composite materials using a combined loading compres-sion (CLC) (1)2or comparable test fixture. This test
4、method isapplicable to general flat laminates that are balanced andsymmetric and contain at least one 0 ply. The standardspecimen is untabbed, and, thus, for strength determination, thelaminate is limited to a maximum of 50 % 0 plies, orequivalent (see 6.4).1.2 The compressive force is introduced in
5、to the specimenby combined end- and shear-loading. In comparison, TestMethod D 3410/D 3410M is a pure shear-loading compressiontest method and Test Method D 695 is a pure end-loading testmethod.1.3 Unidirectional (0 ply orientation) composites can betested to determine unidirectional composite modul
6、us andPoissons ratio, but not compressive strength.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 b
7、e used independently of the other. Combining valuesfrom the two systems may result in nonconformance with thestandard.NOTE 1Additional procedures for determining the compressive prop-erties of polymer matrix composites may be found in Test MethodsD 3410/D 3410M, D 5467, and D 695.1.5 This standard d
8、oes 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.2. Referenced Documents2.1 ASTM St
9、andards:D 695 Test Method for Compressive Properties of RigidPlastics3D 883 Terminology Relating to Plastics3D 3410/D 3410M Test Method for Compressive Propertiesof Polymer Matrix Composite Materials with UnsupportedGage Section by Shear Loading4D 3878 Terminology for Composite Materials4D 5467 Test
10、 Method for Compressive Properties of Unidi-rectional Polymer Matrix Composites Using a SandwichBeam4D 5687/D 5687M Guide for Preparation of Flat CompositePanels with Processing Guidelines for Specimen Prepara-tion4E4 Practices for Force Verification of Testing Machines5E6 Terminology Relating to Me
11、thods of Mechanical Test-ing5E 122 Practice for Calculating Sample Size to Estimate,with a Specified Tolerable Error, the Average for a Char-acteristic of a Lot or Process6E 132 Test Method for Poissons Ratio at Room Tempera-ture5E 177 Practice for Use of the Terms Precision and Bias inASTM Test Met
12、hods6E 456 Terminology Relating to Quality and Statistics6E 1309 Guide for Identification of Fiber-Reinforced Poly-mer Matrix Composite Materials in Databases4E 1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases41This test method is under the jurisdict
13、ion of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.04 onLamina and Laminate Test Methods.Current edition approved March 10, 2001. Published May 2001.2Boldface numbers in parentheses refer to the list of references at the end of thistest method.3Annua
14、l Book of ASTM Standards, Vol 08.01.4Annual Book of ASTM Standards, Vol 15.03.5Annual Book of ASTM Standards, Vol 03.01.6Annual Book of ASTM Standards, Vol 14.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.E 1471 Guide for Identi
15、fication of Fibers, Fillers, and CoreMaterials in Computerized Material Property Databases42.2 ASTM Adjunct:Combined Loading Compression (CLC) Test Fix-ture, D 664172.3 Other Documents:8ANSI Y14.5-1999, “Dimensioning and TolerancingIncludes Inch and Metric”ANSI B46.1-1995, “Surface Texture (Surface
16、Roughness,Waviness and Lay)”3. Terminology3.1 DefinitionsTerminology D 3878 defines terms relatingto high-modulus fibers and their composites. TerminologyD 883 defines terms relating to plastics. Terminology E6defines terms relating to mechanical testing. TerminologyE 456 and Practice E 177 define t
17、erms relating to statistics. Inthe event of a conflict between terms, Terminology D 3878shall have precedence over the other Terminology standards.3.2 Symbols:Across-sectional area of specimen in gage sectionByface-to-face percent bending in specimenBFback-out factorCVsample coefficient of variation
18、, in percentEclaminate compressive modulusFculaminate ultimate compressive strengthFcu0pliescompressive stress in 0 plies at laminate failureFcrEuler buckling stressGxzthrough-thickness shear modulus of laminateG12in-plane shear modulus of the 0 pliesG13,G23through-thickness shear moduli of the 0 pl
19、ieshspecimen thicknessImoment of inertia of specimen cross sectionlgspecimen gage lengthnnumber of specimensPload carried by test specimenPfload carried by test specimen at failuresas used in a lay-up code, denotes that the preceding plydescription for the laminate is repeated symmetrically aboutits
20、 midplanesn-1sample standard deviationV0volume fraction of 0 plies in laminateV90volume fraction of 90 plies in laminatewspecimen gage widthxsample mean (average)ximeasured or derived propertyeindicated normal strain from strain transducerexlaminate axial straineylaminate in-plane transverse straine
21、1,e2strain gage readingsvxyccompressive Poissons ratio4. Summary of Test Method4.1 A test fixture such as that shown in Figs. 1 and 2,oranycomparable fixture, can be used to test the untabbed, straight-sided composite specimen of rectangular cross section shownschematically in Fig. 3. A typical spec
22、imen is 140 mm 5.5 in.long and 12 mm 0.5 in. wide, having an unsupported (gage)length of 12 mm 0.5 in. when installed in the fixture. A gagelength between 12 mm and 25 mm 1.0 in. is acceptable,subject to specimen buckling considerations (see 8.2). This12-mm gage length provides sufficient space to i
23、nstall bondedstrain gages when they are required. The fixture, whichsubjects the specimen to combined end- and shear-loading, isitself loaded in compression between flat platens in a universaltesting machine. Load-strain data are collected until failureoccurs (or until a specified strain level is ac
24、hieved if onlycompressive modulus or Poissons ratio, or both, is to bedetermined, and not the complete stress-strain curve to failure).7A detailed drawing for the fabrication of the test fixture shown in Figs. 1 and2 is available from ASTM Headquarters. Order Adjunct No. ADJD6641.8Available from Ame
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