SIST EN 658-2:2004
(Main)Advanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Part 2: Determination of compression properties
Advanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Part 2: Determination of compression properties
This part of EN 658 specifies the conditions for determination of compression properties of ceramic matrix composite materials with continuous fibre reinforcement at ambient temperature. This standard applies to all ceramic matrix composites with a continuous fibre reinforcement, unidirectional (1D), bidirectional (2D), and tridirectional (xD, with 2< x < 3), loaded along one principal axis of reinforcement. Two cases are distinguished: - compression between platens; - compression using grips.
Hochleistungskeramik - Mechanische Eigenschaften von keramischen Verbundwerkstoffen bei Raumtemperatur - Teil 2: Bestimmung der Eigenschaften unter Druck
In diesem Teil von EN 658 sind die Bedingungen zur Bestimmung der Eigenschaften unter Druck von endlosfaserverstärkten Verbundwerkstoffen mit keramischer Matrix bei Raumtemperatur festgelegt, bidirektionaler (2D) und mehrdirektionaler (xD, mit 2 < x <3) Faserverstärkung, die parallel zu einer der Hauptverstärkungsachsen beansprucht werden. Man unterscheidet zwei Fälle: - Druckbeanspruchung zwischen Platten; - Druckbeanspruchung unter Verwendung von Einspannvorrichtungen.
Céramiques techniques avancées - Propriétés mécaniques des céramiques composites a température ambiante - Partie 2: Détermination des propriétés en compression
La présente partie de cette Norme européenne décrit une méthode permettant de déterminer les propriétés en compression des matériaux composites a matrice céramique et a renfort fibreux continu a la température ambiante. Cette méthode s'applique a tous les composites a matrice céramique a renfort fibreux continu, unidirectionnel (1D), bidirectionnels (2D) et tridirectionnels (xD, avec 2 < x 3), conformément a l'ENV 13233, sollicités suivant un axe principal de renfort.
On distingue deux cas :
compression entre plateaux ;
compression utilisant des mors de serrage.
Advanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Part 2: Determination of compression properties
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Advanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Part 2: Determination of compression propertiesHochleistungskeramik - Mechanische Eigenschaften von keramischen Verbundwerkstoffen bei Raumtemperatur - Teil 2: Bestimmung der Eigenschaften unter DruckCéramiques techniques avancées - Propriétés mécaniques des céramiques composites a température ambiante - Partie 2: Détermination des propriétés en compressionAdvanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Part 2: Determination of compression properties81.060.30Sodobna keramikaAdvanced ceramicsICS:Ta slovenski standard je istoveten z:EN 658-2:2002SIST EN 658-2:2004en01-januar-2004SIST EN 658-2:2004SLOVENSKI
STANDARDSIST ENV 658-2:20001DGRPHãþD
SIST EN 658-2:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 658-2December 2002ICS 81.060.30Supersedes ENV 658-2:1993English versionAdvanced technical ceramics - Mechanical properties of ceramiccomposites at room temperature - Part 2: Determination ofcompression propertiesCéramiques techniques avancées - Propriétés mécaniquesdes céramiques composites à température ambiante -Partie 2: Détermination des propriétés en compressionHochleistungskeramik - Mechanische Eigenschaften vonkeramischen Verbundwerkstoffen bei Raumtemperatur -Teil 2: Bestimmung der Eigenschaften unter DruckThis European Standard was approved by CEN on 16 October 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 658-2:2002 ESIST EN 658-2:2004
EN 658-2:2002 (E)2ContentspageForeword.31Scope.42Normative references.43Principle.44Terms, definitions and symbols.45Apparatus.65.1Test machine.65.2Load train.65.3Strain measurement.65.3.1Strain gauges.65.3.2Extensometry.75.4Data recording system.75.5Dimension measuring devices.76Test specimens.76.1Compression between platens.86.2Test specimen used with grips.107Test specimen preparation.137.1Machining and preparation.137.2Number of test specimens.138Test procedure.138.1Displacement rate.138.2Measurement of test specimen dimensions.148.3Buckling.148.4Testing technique.148.4.1Specimen mounting.148.4.2Extensometers.148.4.3Measurements.148.5Test validity.159Calculation of results.159.1Test specimen origin.159.2Compression strength.159.3Strain at maximum compression force.159.4Proportionality ratio or pseudo-elastic modulus, elastic modulus.1610Test report.17SIST EN 658-2:2004
EN 658-2:2002 (E)3ForewordThis document (EN 658-2:2002) has been prepared by Technical Committee CEN /TC 184, "Advanced technicalceramics", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2003, and conflicting national standards shall be withdrawn at the latest byJune 2003.This document supersedes ENV 658-2 :1993.EN 658 consists of the following parts, under the general title "Advanced technical ceramics – Mechanicalproperties of ceramic composites at room temperature"¾ Part 1 : Determination of tensile properties¾ Part 2 : Determination of compressive properties¾ Part 3 : Determination of flexural strength¾ Part 4 : Determination of interlaminar shear strength by compression loading of notched test specimens¾ Part 5 : Determination of interlaminar shear strength by short span bend test (three-points)¾ Part 6 : Determination of interlaminar shear strength by double-punch shearingAccording to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.SIST EN 658-2:2004
EN 658-2:2002 (E)41 ScopeThis part of this European Standard describes a method for determination of compression properties of ceramicmatrix composite materials with continuous fibre reinforcement at room temperature. This method applies to allceramic matrix composites with a continuous fibre reinforcement, unidirectional (1D), bidirectional (2D), andtridirectional (xD, with 2 < x £ 3) as defined in ENV 13233, loaded along one principal axis of reinforcement.Two cases are distinguished:¾ compression between platens;¾ compression using grips.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).ENV 13233:1998, Advanced technical ceramics - Ceramic composites - Notations and symbols.EN ISO 7500-1:1999, Metallic materials - Verification of static uniaxial testing machines - Part 1:Tension/compression testing machines (ISO 7500-1:1999).ISO 3611, Micrometer callipers for external measurements3 PrincipleA test specimen of specified dimensions is loaded in compression. The test is performed at a constant crossheaddisplacement rate or at a constant deformation rate.NOTE 1Constant loading rate is only allowed in the case of linear stress strain behaviour up to failure.NOTE 2When applied, it is recommended to use constant cross head displacement rate when the test is carried out up tofailure.The force and longitudinal deformation are measured and recorded simultaneously.4 Terms, definitions and symbolsFor the purposes of this European Standard, the following terms and definitions and the symbols given inENV 13233 apply.4.1calibrated length, lthe part of the test specimen which has uniform and minimum cross-section area4.2gauge length, Loinitial distance between reference points on the test specimen in the calibrated lengthSIST EN 658-2:2004
EN 658-2:2002 (E)54.3initial cross-section area, Aoinitial cross-section of the test specimen within calibrated length4.4longitudinal deformation, DLdecrease in the gauge length between reference points under a compression force. Its value corresponding to themaximum force shall be denoted DLc,m4.5compression strain, erelative change in the gauge length defined as the ratio DL/Lo. Its value corresponding to the maximum force shallbe denoted ec,m4.6compression stress, sthe compression force supported by the test specimen at any time in the test divided by the initial cross-sectionarea4.7maximum compression force, Fc,mhighest recorded compression force in a compression test on the test specimen when tested to failure4.8compression strength, sc,mratio of the maximum tensile force to the initial cross-section area4.9proportionality ratio or pseudo-elastic modulus Ep, elastic modulus Ethe slope of the linear section of the stress-strain curve, if any. Examination of the stress-strain curves for ceramicmatrix composites allows definition of the following cases:a) material with a linear section in the stress-strain curveFor ceramic matrix composites that have a mechanical behaviour characterised by a linear section, theproportionality ratio Ep is defined as:()121221,Ep--= (1)where(e1, s1) and (e2, s2)lie near the lower and the upper limits of the linear section of the stress-strain curve (seeFigures 1 and 2).The proportionality ratio or pseudo-elastic modulus is termed the elastic modulus, E, in the single case wherethe linearity starts near the origin (see Figure 2);b) material with non-linear section in the stress-strain curveIn this case only stress-strain couples can be fixed.4.10axial strainaverage of the longitudinal strain measured at the surface of the test specimen at specified locationsSIST EN 658-2:2004
EN 658-2:2002 (E)64.11bending strainthe difference between the longitudinal strain at a given location on the test specimen surface and the axial strain4.12percent bendingthe bending strain times 100 divided by the axial strain5 Apparatus5.1 Test machineThe machine shall be equiped with a system for measuring the force applied to the test specimen which shallconform to grade 1 or better according to EN ISO 7500-1:1999.5.2 Load trainThe load train is composed of the moveable and fixed crosshead, the loading rods and the grips or platens. Loadtrain couplers may additionally be used to connect the grips or platens to the loading rods.The load train shall align the specimen axis with the direction of load application without introducing bending ortorsion in the specimen.
The maximum percent bending shall not exceed 5 at an average strain of 610500-×.There are two alternative means of load application:a) compression platens are connected to
the load cell and on the moving cross head. The parallelism of theseplatens shall be better than 0,01 mm, in the loading area and they shall be perpendicular to the load direction.NOTE 1The use of platens is not recommended for compression testing of 1D and 2D materials with low thicknessesbecause of buckling.NOTE 2A compliant interlayer material between the test specimen and platens can be used for testing macroscopicallyinhomogeneous materials to ensure uniform contact pressure.When the dimensions of specimen are such that buckling may occur, it is recommended to use an antibucklingtool such as one of those which are described in EN ISO 14126. This tool should not induce parasitic stressesduring loading of the specimen;b) grips are used to clamp and load the test specimen.The grip design shall prevent the test
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