EN 12291:2003
(Main)Advanced technical ceramics - Mechanical properties of ceramic composites at high temperature in air at atmospheric pressure - Determination of compression properties
Advanced technical ceramics - Mechanical properties of ceramic composites at high temperature in air at atmospheric pressure - Determination of compression properties
This European Standard EN 12291 specifies the conditions for determination of compression properties of ceramic matrix composite materials with continuous fibre reinforcement for temperatures up to 1 700 °C in air at atmospheric pressure.
This European 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.
NOTE 1 In most cases, ceramic matrix composites to be used at high temperature in air are coated with an anti oxidation coating.
NOTE 2 The purpose of this European standard is to determine the compression properties of a material when it is placed under an oxidizing environment but not to measure material oxidation.
Two cases are distinguished:
a) compression between platens;
b) compression using grips.
Hochleistungskeramik - Mechanische Eigenschaften von Keramischen Verbundwerkstoffen bei hoher Temperatur an Luft bei Atmosphärendruck - Bestimmung der Eigenschaften unter Druck
Diese Europäische Norm EN 12291 legt die Bedingungen zur Bestimmung der Eigenschaften von endlosfaserverstärkten keramischen Verbundwerkstoffen unter Druckbeanspruchung bei Temperaturen bis zu 1700 °C in Luft bei Atmoshpärendruck fest.
Diese Europäische Norm gilt für alle endlosfaserverstärkten Verbundwerkstoffe mit keramischer Matrix mit unidirektionaler (1D), bidirektionaler (2D) und mehrdirektionaler (xD, mit 2 < x 3) Verstärkung mit der Beanspruchung parallel zu einer der Hauptverstärkungsachsen.
ANMERKUNG 1 In den meisten Fällen sind die bei hoher Temperatur in Luft eingesetzten Verbundwerkstoffe mit keramischer Matrix mit einer Deckschicht gegen Oxidation beschichtet.
ANMERKUNG 2 Der Zweck dieser Europäischen Norm besteht darin, die Druckeigenschaften eines Materials in oxidierender Umgebung, nicht aber die Oxidation des Materials, zu bestimmen.
Zwei Fälle werden unterschieden:
a) Druckbeanspruchung zwischen Platten;
b) Druckbeanspruchung mit Einspanneinrichtungen.
Céramiques techniques avancées - Propriétés mécaniques des céramiques composites à haute température sous air à la pression atmosphérique - Détermination des caractéristiques en compression
La présente Norme européenne EN 12291 spécifie les conditions de détermination des propriétés en compression des matériaux composites à matrice céramique et à renfort fibreux continu pour des températures allant jusqu'à 1 700 °C sous air à la pression atmosphérique.
La présente Norme européenne s'applique à tous les composites à matrice céramique à renfort fibreux continu, unidirectionnels (1D), bidirectionnels (2D) et tridirectionnels (xD, avec 2 < ´ £ 3), sollicités suivant un axe principal de renfort.
NOTE 1 Dans la plupart des cas, les composites à matrice céramique destinés à un usage à haute température sous air sont protégés par un revêtement anti-oxydation.
NOTE 2 L'objet de la présente Norme européenne est de déterminer les propriétés en compression d'un matériau quand il est placé en ambiance oxydante et non pas de quantifier l'oxydation.
Deux cas sont distingués :
a) compression entre plateaux ;
compression entre mors.
Advanced technical ceramics - Mechanical properties of ceramic composites at high temperature in air at atmospheric pressure - Determination of compression properties
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Advanced technical ceramics - Mechanical properties of ceramic composites at high temperature in air at atmospheric pressure - Determination of compression propertiesHochleistungskeramik - Mechanische Eigenschaften von Keramischen Verbundwerkstoffen bei hoher Temperatur an Luft bei Atmosphärendruck - Bestimmung der Eigenschaften unter DruckCéramiques techniques avancées - Propriétés mécaniques des céramiques composites a haute température sous air a la pression atmosphérique - Détermination des caractéristiques en compressionAdvanced technical ceramics - Mechanical properties of ceramic composites at high temperature in air at atmospheric pressure - Determination of compression properties81.060.30Sodobna keramikaAdvanced ceramicsICS:Ta slovenski standard je istoveten z:EN 12291:2003SIST EN 12291:2004en01-januar-2004SIST EN 12291:2004SLOVENSKI
STANDARDSIST ENV 12291:20001DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12291July 2003ICS 81.060.30Supersedes ENV 12291:1996English versionAdvanced technical ceramics - Mechanical properties of ceramiccomposites at high temperature in air at atmospheric pressure -Determination of compression propertiesCéramiques techniques avancées - Propriétés mécaniquesdes céramiques composites à haute température sous air àla pression atmosphérique - Détermination descaractéristiques en compressionHochleistungskeramik - Mechanische Eigenschaften vonKeramischen Verbundwerkstoffen bei hoher Temperatur anLuft bei Atmosphärendruck - Bestimmung derEigenschaften unter DruckThis European Standard was approved by CEN on 23 May 2003.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,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12291:2003 ESIST EN 12291:2004
Buckling: How to proceed when buckling is suspected.19Bibliography.20SIST EN 12291:2004
the test specimen in the calibrated length. The temperature variation inthe gauge length shall be within 20 °C at test temperature3.4 controlled temperature zonepart of the calibrated length including the gauge length where the temperature is in a range of ± 50 °C of the testtemperature3.5 initial cross section area, Aoinitial cross section area of the test specimen within the calibrated length, at test temperaturetwo initial cross section areas of the test specimen can be defined: apparent cross section area: This is the total area of the cross section, Ao,a; effective cross section area: This is the total area corrected by a factor, to account for the presence of anantioxidant protection, Ao,e3.6 longitudinal deformation, Ldecrease in the gauge length between reference points under a compression force. It’s value corresponding to themaximum force shall be denoted as Lc,m3.7 compression strain, relative change in the gauge length defined as the ratio L/Lo.Its value corresponding to the maximum force shallbe denoted as c,m3.8 compression stress, compression force supported by the test specimen at any time in the test divided by the initial cross section areatwo compression stresses can be distinguished: apparent compression stress, a, when the apparent cross section area (or total cross section area) is used effective compression stress, e, when the effective cross section area is used3.9 maximum compression force, Fmhighest recorded compression force in a compression test on the test specimen when tested to failureSIST EN 12291:2004
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