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BS EN 13234:2006

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Advanced technical ceramics. Mechanical properties of ceramic composites at ambient temperature. Evaluation of the resistance to crack propagation by notch sensitivity testing
Available format(s)

Hardcopy , PDF

Superseded date

10-31-2022

Language(s)

English

Published date

12-29-2006

Foreword
1 Scope
2 Normative references
3 Principle
4 Significance and use
5 Terms, definitions and symbols
6 Apparatus
   6.1 Test machine
   6.2 Load train
   6.3 Data recording system
   6.4 Micrometers
   6.5 Ligament size measuring device
7 Specimens
   7.1 Un-notched test specimens
   7.2 Notched test specimens
   7.3 Notches
8 Test specimen preparation
   8.1 Machining and preparation
   8.2 Number of test specimens
9 Test procedure
   9.1 Test on reference specimen
   9.2 Test on notched specimen
10 Calculation of results
   10.1 Test specimen origin
   10.2 Tensile strength of un-notched specimen
   10.3 Tensile strength of the notched specimen
   10.4 Plotting of notch sensitivity diagram
   10.5 Calculation of equivalent fracture toughness for
        the different classes of behaviour
11 Test report
Bibliography

Defines a method for the classification of ceramic matrix composite (CMC) materials with respect to their sensitivity to crack propagation using tensile tests on notched specimens with different notch depths. Two classes of ceramic matrix composite materials can be distinguished: materials whose strength is sensitive to the presence of notches and materials whose strength is not affected. For sensitive materials, this European Standard defines a method for determining equivalent fracture toughness.

This European Standard describes a method for the classification of ceramic matrix composite (CMC) materials with respect to their sensitivity to crack propagation using tensile tests on notched specimens with different notch depths. Two classes of ceramic matrix composite materials can be distinguished: materials whose strength is sensitive to the presence of notches and materials whose strength is not affected. For sensitive materials, this European Standard defines a method for determining equivalent fracture toughness. The parameter, Keq, is defined as the fracture toughness of a homogeneous material which presents the same sensitivity to crack propagation as the ceramic matrix composite material which is being considered. The definition of the Keq parameter offers the possibility to compare ceramic matrix composite materials with other materials with respect to sensitivity to crack propagation. For notch insensitive materials, the concept of Keq does not apply. This European Standard applies to all ceramic matrix composites with a continuous fibre reinforcement, unidirectional (1 D), bidirectional (2 D), and tridirectional (x D, where 2 < x ? 3), loaded along one principal axis of reinforcement.

Committee
RPI/13
DevelopmentNote
Supersedes DD ENV 13234. (12/2006)
DocumentType
Standard
Pages
18
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes
UnderRevision

Standards Relationship
NBN EN 13234 : 2006 Identical
SN EN 13234 : 2006 Identical
EN 13234:2006 Identical
DIN EN 13234:2007-01 Identical
UNI EN 13234 : 2007 Identical
NF EN 13234 : 2007 Identical
I.S. EN 13234:2006 Identical
NEN EN 13234 : 2006 Identical
NS EN 13234 : 1ED 2007 Identical

EN 658-1:1998 Advanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Part 1: Determination of tensile properties
ASTM E 1152 : 1995 Test Method for Determining J-R Curves (Withdrawn 1997)
ISO 3611:2010 Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for external measurements — Design and metrological characteristics
ISO 7500-1:2015 Metallic materials Calibration and verification of static uniaxial testing machines Part 1: Tension/compression testing machines Calibration and verification of the force-measuring system
ASTM E 813 : 1989 TEST METHOD FOR J1C, A MEASURE OF FRACTURE TOUGHNESS

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