EN 12289:2005

SLOVENSKI STANDARD
01-november-2005
1DGRPHãþD
SIST ENV 12289:2000
Advanced technical ceramics - Mechanical properties of ceramic composites at
ambient temperature - Determination of in-plane shear properties
Advanced technical ceramics - Mechanical properties of ceramic composites at ambient
temperature - Determination of in-plane shear properties
Hochleistungskeramik - Mechanische Eigenschaften von keramischen
Verbundwerkstoffen bei Raumtemperatur - Bestimmung der Schereigenschaften in der
Ebene
Céramiques techniques avancées - Propriétés mécaniques des céramiques composites
a température ambiante - Détermination des caractéristiques en cisaillements plan
Ta slovenski standard je istoveten z: EN 12289:2005
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 12289
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2005
ICS 81.060.30 Supersedes ENV 12289:1996
English version
Advanced technical ceramics - Mechanical properties of ceramic
composites at ambient temperature - Determination of in-plane
shear properties
Céramiques techniques avancées - Propriétés mécaniques Hochleistungskeramik - Mechanische Eigenschaften von
des céramiques composites à température ambiante - keramischen Verbundwerkstoffen bei Raumtemperatur -
Détermination des caractéristiques en cisaillements plan Bestimmung der Schereigenschaften in der Ebene
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 12289:2005: 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.5
5 Apparatus .5
5.1 Test machine .5
5.2 Test jig .5
5.3 Strain gauges .6
5.4 Data recording system .6
5.5 Micrometers.6
6 Test specimens .6
7 Test specimen preparation.7

7.1 Machining .7
7.2 Bonding of the gauges .7
7.3 Number of test specimens .7
8 Test procedure .8
8.1 Measurement of test specimens dimensions .8
8.2 Testing technique .8
8.3 Test validity .9
9 Calculation of results.9
9.1 Test specimen origin .9
9.2 Use of the stress strain curves .9
9.3 Proportionality ratio or pseudo-elastic shear modulus, elastic shear modulus .10
10 Test report .10
Annex A (normative) Figures.12
Annex B (informative) Examples of figures.15
Bibliography.17

Foreword
This document (EN 12289:2005) 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 12289:1996.
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 the determination of the in-plane shear properties at
ambient temperature of ceramic matrix composite materials with continuous fibre reinforcement.
This European Standard applies to ceramic matrix composites with a continuous fibre reinforcement, bi-
directional (2D) and tri-directional (xD, with 2 < x < 3).
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 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 document, the following terms and definitions apply.
3.1
initial cross-section area, A
o
area of the test piece cross section in the 2,3 plane between the two notches (see Figure A.1)
3.2
measurement zone
part of the test piece, in the 1,2 plane, between the notches, in which a uniform shear field is assumed (see
Figure A.1)
NOTE For practical purposes, it is generally assumed to be ± 2 mm on the longitudinal axis of the test piece, on each
side of the cross section area.
3.3
in-plane shear strain, γ
change in angle of an originally orthogonal set of lines parallel to the directions 1 and 2 as a consequence of
load application
3.4
in-plane shear, τ
ratio of applied force to the cross section area
3.5
in-plane shear strength, τ
12,m
ratio of the maximum force applied, to the cross section area
3.6
proportionality ratio or pseudo-elastic shear modulus, Gp elastic shear modulus G
12 12
slope of the linear section of the shear stress-shear strain curve, if any
NOTE Examination of the shear stress-shear strain curves for ceramic matrix composites allows definition of the
following cases:
a) Material with a linear section in the shear stress-shear strain curve;
for ceramic matrix composites that have a mechanical behaviour characterized by a linear section, the proportionality ratio
is defined as:
τ12,2 −τ12,1
Gp()τ ,τ = (1)
12 12,1 12,2
γ −γ
12,2 12,1
where
(γ ,τ ) and (γ ,τ ) lie on the linear section of the shear stress-shear strain curve.
12,1 12,1 12,2 12,2
b) proportionality ratio or pseudo elastic shear modulus is termed the elastic shear modulus, G , in the single case
where the linearity starts from the origin.
c) material with non linear shear stress-strain behaviour.
In this case, only stress strain couples can be fixed.
4 Principle
NOTE 1 Figures pertaining to test specimens and equipment are given in Annexes A and B.
A test specimen with two centrally located V notches (see Figure A.1) is submitted to a translation of its part B
parallel to the plane 1,2 along the direction 2 while its part A is kept still.
The directions 1 and 2 correspond to the principal reinforcement directions of the material. The displacement
of part B with respect to part A results in a pure shear zone in the section between the notches subjecting the
material to an in-plane shear.
Force and shear strain along the principal directions in the plane 1,2 are measured and recorded
simultaneously, from which shear modulus and shear strength can be determined.
NOTE 2 The test is performed at constant displacement rate, up to failure.
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.
5.2 Test jig
The test jig shall be designed so that the force is applied in the 1,2 plane, normal to the longitudinal axis of the
test piece. It shall allow the displacement of part B, relatively to part A.
The jig shall allow accurate mounting of the specimen, so that the notches are midway between the loading
points.
NOTE 1 This is usually achieved with an alignment pin or similar tool.
The jig shall prevent out-of-plane loading of the specimen. This shall be verified using a dummy specimen
made of an homogenous isotropic material equipped with strain gauges on the front and back faces located
as specified in 5.3.
The dummy test piece shall be loaded to at least 50 % of the expected failure load of the material to be tested,
and readings taken from all four strain gauges. The average strain gauge reading shall be calculated.
Individual strain gauge readings at any load shall not differ by more than 5 % from the average of that load.
The dummy test piece shall remain linear elastic during this verification.
NOTE 2 An example of a jig is shown in Figure B.1.
5.3 Strain gauges
At least one face of the specimen shall be equipped with two strain gauges in the measurement zone,
orientated at ± 45° with respect to the longitudinal axis of the specimen (see example in Figure B.2).
The gauge length shall be at least equal to the length of the representative volume element of the material
structure in the direction of the gauge and compatible with the size of the measurement zone.
5.4 Data recording system
NOTE A calibrated recorder may be used to record force-deformation curves. The use of a digital data recording
system combined with an analogue recorder is recommended.
5.5 Micrometers
Micrometers used for the measurement of the cross-sectional dimensions of the test specimen shall conform
to ISO 3611 and shall be accurate to ± 0,01 mm.
6 Test specimens
Test piece sides used to apply the forces shall be flat and parallel (see Figure A.2). Recommended
dimensions are given in Table 1.
Table 1 — Recommended dimensions for test specimens
2D and xD Tolerance
l , total length 50 mm to 100 mm
± 0,5 mm
t
b, width >12 mm
± 0,2 mm
h, thickness (indicative) >3 mm
± 0,2 mm
Notch angle 90° to 120° ± 2°
W, depth of each notch 20 % of b ± 0,2 mm
r, notch radius 1,0 mm < r < 1,5 mm ± 0,2 mm
Parallelism between machined parts and 0,05 mm
notch root
Perpendicu
...