EN 12290:2005
(Main)Advanced technical ceramics - Mechanical properties of ceramic composites at high temperature under inert atmosphere - Determination of compression properties
Advanced technical ceramics - Mechanical properties of ceramic composites at high temperature under inert atmosphere - Determination of compression properties
This European Standard specifies the conditions for determination of compression properties of ceramic matrix composite materials with continuous fibre reinforcement for temperatures up to 2 000 °C under vacuum or a gas atmosphere which is inert to the material under test.
NOTE The use of these environments is aimed at avoiding changes of the material to be tested due to chemical reaction with its environment during the test.
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.
Two types of compression are distinguished:
a) compression between platens;
b) compression using grips.
Hochleistungskeramik - Mechanische Eigenschaften von keramischen Verbundwerkstoffen bei hoher Temperatur in inerter Atmosphäre - Bestimmung der Eigenschaften unter Druck
4
Diese Europaische Norm legt die Bedingungen zur Bestimmung der Eigenschaften von endlosfaser-verstarkten
Verbundwerkstoffen mit keramischer Matrix unter Druckbeanspruchung bei Temperaturen bis zu
2 000 ¡ÆC im Vakuum oder in einer gegenuber dem zu prufenden Werkstoff inerten Atmosphare fest.
ANMERKUNG Die Anwendung dieser Atmospharen hat den Zweck, Veranderungen des zu prufenden Werkstoffes
aufgrund einer chemischen Reaktion mit der umgebenden Atmosphare wahrend der Prufung zu vermeiden.
Diese Europaische Norm ist auf alle endlosfaserverstarkten Verbundwerkstoffe mit keramischer Matrix mit
unidirektionaler (1D), bidirektionaler (2D) und mehrdirektionaler (xD, mit 2 < x ¡Âparallel zu einer der Hauptverstarkungsachsen anwendbar.
Zwei Arten der Druckbelastung werden unterschieden:
a) Druckbelastung zwischen Platten;
b) Druckbelastung mit Einspanneinrichtungen.
Céramiques techniques avancées - Propriétés mécaniques des céramiques composites à haute température en atmosphère neutre - Détermination des caractéristiques en compression
La présente Norme européenne a pour objet de fixer 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 2 000 °C sous vide ou sous une atmosphère gazeuse neutre vis-à-vis du matériau
essayé.
NOTE L'utilisation de ces environnements permet d'éviter au matériau à tester, des changements dus à une réaction
chimique avec l'environnement pendant l'essai.
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 < x £ 3) sollicités suivant un
axe principal de renfort.
Deux cas de compression sont distingués :
a) la compression entre plateaux ;
b) la compression entre mors.
Advanced technical ceramics - Mechanical properties of ceramic composites at high temperature under inert atmosphere - Determination of compression properties
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2005
1DGRPHãþD
SIST ENV 12290:2000
Advanced technical ceramics - Mechanical properties of ceramic composites at
high temperature under inert atmosphere - Determination of compression
properties
Advanced technical ceramics - Mechanical properties of ceramic composites at high
temperature under inert atmosphere - Determination of compression properties
Hochleistungskeramik - Mechanische Eigenschaften von keramischen
Verbundwerkstoffen bei hoher Temperatur in inerter Atmosphäre - Bestimmung der
Eigenschaften unter Druck
Céramiques techniques avancées - Propriétés mécaniques des céramiques composites
a haute température en atmosphere neutre - Détermination des caractéristiques en
compression
Ta slovenski standard je istoveten z: EN 12290:2005
ICS:
81.060.30 Sodobna keramika Advanced ceramics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 12290
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2005
ICS 81.060.30 Supersedes ENV 12290:1996
English version
Advanced technical ceramics - Mechanical properties of ceramic
composites at high temperature under inert atmosphere -
Determination of compression properties
Céramiques techniques avancées - Propriétés mécaniques Hochleistungskeramik - Mechanische Eigenschaften von
des céramiques composites à haute température en keramischen Verbundwerkstoffen bei hoher Temperatur in
atmosphère neutre - Détermination des caractéristiques en inerter Atmosphäre - Bestimmung der Eigenschaften unter
compression Druck
This European Standard was approved by CEN on 12 May 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12290:2005: E
worldwide for CEN national Members.
Contents page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms, definitions and symbols.4
4 Principle.6
5 Apparatus .6
5.1 Test machine.6
5.2 Load train.6
5.3 Gastight test chamber.7
5.4 Set-up for heating .7
5.5 Extensometer .7
5.6 Temperature measurement devices .7
5.7 Data recording system .8
5.8 Micrometers.8
6 Test specimens.8
6.1 General.8
6.2 Compression between platens.8
6.3 Test specimen used with grips .9
7 Test specimen preparation.12
7.1 Machining and preparation.12
7.2 Number of test specimens.12
8 Test procedures.12
8.1 Test set-up: Temperature considerations.12
8.2 Test set-up: other considerations.13
8.3 Testing technique .14
8.4 Test validity .15
9 Calculation of results .15
9.1 Test specimen origin.15
9.2 Compression strength .15
9.3 Strain at maximum compression force .16
9.4 Proportionality ratio or pseudo-elastic modulus, elastic modulus .16
10 Test report .17
Annex A (normative) Buckling: How to proceed when buckling is suspected.18
A.1 Preliminary room temperature test.18
A.2 Test with two different specimens.18
Bibliography .19
Foreword
This document (EN 12290:2005) has been prepared by Technical Committee CEN/TC 184 “Advanced
technical ceramics”, 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 or by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn
at the latest by December 2005.
This document supersedes ENV 12290:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
1 Scope
This European Standard specifies the conditions for determination of compression properties of ceramic
matrix composite materials with continuous fibre reinforcement for temperatures up to 2 000 °C under vacuum
or a gas atmosphere which is inert to the material under test.
NOTE The use of these environments is aimed at avoiding changes of the material to be tested due to chemical
reaction with its environment during the test.
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.
Two types of compression are distinguished:
a) compression between platens;
b) compression using grips.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 10002-4, Metallic materials - Tensile test - Part 4: Verification of extensometers used in uniaxial testing.
EN 60584-1, Thermocouples - Part 1: Reference tables (IEC 60584-1:1995).
EN 60584-2, Thermocouples — Part 2: Tolerances (IEC 60584-2:1982 + A1:1989).
EN ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force measuring system (ISO
7500-1:2004).
ISO 3611, Micrometer callipers for external measurement.
3 Terms, definitions and symbols
For the purposes of this European Standard, the following terms and definitions apply.
3.1
test temperature, T
temperature of the test piece at the centre of the gauge length
3.2
calibrated length, l
part of the test specimen that has uniform and minimum cross-section area
3.3
gauge length, L
o
initial distance between reference points on the test specimen in the calibrated length
3.4
controlled temperature zone
part of the calibrated length including the gauge length where the temperature is within a range of 50 °C of the
test temperature
3.5
initial cross-section area, A
o
initial cross-section area of the test specimen within the calibrated length, at test temperature
3.6
longitudinal deformation, ∆∆∆∆ L
decrease in the gauge length L between reference points under a compression force
NOTE Its value at maximum force is denoted ∆ L .
c,m
3.7
compression strain, ∈∈∈∈
relative change in the gauge length defined as the ratio ∆ L/L
o
NOTE Its value at maximum force is denoted as ∈ .
c,m
3.8
compression stress, σσσσ
compression force supported by the test specimen at any time in the test divided by the initial cross-section
area (A )
o
3.9
maximum compression force, F
m
highest recorded compression force in a compression test on the test specimen when tested to failure
3.10
compression strength, σσσσ
c,m
ratio of the maximum compression force (F ) to the initial cross-section area (A )
m o
3.11
proportionality ratio or pseudo-elastic modulus, E
p
slope of the linear section of the stress-strain curve, if any
NOTE Examination of the stress-strain curves for ceramic matrix composites allows definition of the following cases:
a) Material with a linear section in the stress-strain curve.
For ceramic matrix composites that have a mechanical behaviour characterized by a linear section, the proportionality
ratio is defined as:
σ − σ
2 1
Ep (σ , σ ) = (1)
1 2
ε − ε
2 1
where
(∈ , σ ) and (∈ , σ ) lie near the lower and upper limits of the linear section of the stress-strain curve.
1 2 2 2
The proportionality ratio or pseudo-elastic modulus is termed the elastic modulus, E, in the single case where the material
has a linear behaviour from the origin.
b) Material with no-linear section in the stress-strain curve.
In this case only stress-strain couples can be fixed.
4 Principle
A test specimen of specified dimensions is heated to the test temperature, and loaded in compression. The
test is performed at constant crosshead displacement rate, or constant deformation rate. Force and
longitudinal deformation are measured and recorded simultaneously.
NOTE 1 The test duration is limited to reduce creep effects.
NOTE 2 Constant loading rate is only allowed in the case of linear stress-strain behaviour up to failure.
NOTE 3 In order to protect fixtures, it is recommended to use constant crosshead displacement rate when the test is
carried out until rupture.
5 Apparatus
5.1 Test machine
The machine shall be equipped with a system for measuring the force applied to the test specimen which shall
conform to grade 1 or better according to EN ISO 7500-1.
NOTE This should prevail during actual test conditions of, e.g. gas pressure and temperature.
5.2 Load train
The load train configuration shall ensure that the load indicated by the load cell and the load experienced by
the test spec
...
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