SIST-TS CEN/TS 843-9:2010

Advanced technical ceramics - Mechanical properties of monolithic ceramics at room temperature - Part 9: Method of test for edge-chip resistance

This Technical Specification describes requirements and methods for undertaking tests to determine the resistance of the edges of brittle ceramic materials to be damaged by chipping or flaking. It is limited to homogeneous monolithic ceramics with flat surfaces and straight sharp or chamfered edges.

Hochleistungskeramik - Mechanische Eigenschaften monolithischer Keramik bei Raumtemperatur - Teil 9: Prüfverfahren zur Bestimmung der Kantenbeständigkeit gegen Abplatzung

Diese Technische Spezifikation beschreibt Anforderungen an und Verfahren für die Durchführung von Prüfun-gen zum Bestimmen der Kantenbeständigkeit von spröden Keramikwerkstoffen gegen Beschädigung durch Abplatzer oder Absplitterung. Sie beschränkt sich auf homogene monolithische Keramik mit ebenen Ober-flächen und geraden, scharfen oder gefasten Kanten.

Céramiques techniques avancées - Propriétés mécaniques des céramiques monolithiques à température ambiante - Partie 9: Méthode d'essai de résistance à l'écaillage des bords

La présente Spécification technique décrit les exigences et méthodes relatives aux essais destinés à déterminer la résistance des bords des céramiques fragiles à une détérioration par écaillage. Elle se limite aux céramiques monolithiques homogènes ayant des surfaces planes et des bords droits pointus ou chanfreinés.

Sodobna tehnična keramika - Mehanske lastnosti monolitske keramike pri sobni temperaturi - 9. del: Metoda preskušanja odpornosti proti krušenju robov

Ta tehnična specifikacija opisuje zahteve in metode za izvajanje preskusov za ugotavljanje odpornosti robov krhkih keramičnih materialov proti poškodbam zaradi krušenja ali luščenja. Omejena je na homogene monolitne keramike z ravnimi površinami in ravnimi ostrimi ali posnetimi robovi.

General Information

• Status: Published
• Publication Date: 13-Sep-2010
• ICS: 81.060.30 - Advanced ceramics
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2010
• Due Date: 06-Nov-2010
• Completion Date: 14-Sep-2010
• Ref Project: CEN/TS 843-9:2010 - Advanced technical ceramics - Mechanical properties of monolithic ceramics at room temperature - Part 9: Method of test for edge-chip resistance

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TS CEN/TS 843-9:2010
01-oktober-2010
6RGREQDWHKQLþQDNHUDPLND0HKDQVNHODVWQRVWLPRQROLWVNHNHUDPLNHSULVREQL
WHPSHUDWXULGHO0HWRGDSUHVNXãDQMDRGSRUQRVWLSURWLNUXãHQMXURERY
Advanced technical ceramics - Mechanical properties of monolithic ceramics at room
temperature - Part 9: Method of test for edge-chip resistance
Hochleistungskeramik - Mechanische Eigenschaften monolithischer Keramik bei
Raumtemperatur - Teil 9: Prüfverfahren zur Bestimmung der Kantenbeständigkeit gegen
Abplatzung
Céramiques techniques avancées - Propriétés mécaniques des céramiques
monolithiques à température ambiante - Partie 9: Méthode d'essai de résistance à
l'écaillage des bords
Ta slovenski standard je istoveten z: CEN/TS 843-9:2010
ICS:
81.060.30 Sodobna keramika Advanced ceramics
SIST-TS CEN/TS 843-9:2010 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CEN/TS 843-9:2010

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SIST-TS CEN/TS 843-9:2010


TECHNICAL SPECIFICATION
CEN/TS 843-9

SPÉCIFICATION TECHNIQUE

TECHNISCHE SPEZIFIKATION
August 2010
ICS 81.060.30
English Version
Advanced technical ceramics - Mechanical properties of
monolithic ceramics at room temperature - Part 9: Method of test
for edge-chip resistance
Céramiques techniques avancées - Propriétés mécaniques Hochleistungskeramik - Mechanische Eigenschaften
des céramiques monolithiques à température ambiante - monolithischer Keramik bei Raumtemperatur - Teil 9:
Partie 9: Méthode d'essai de résistance à l'écaillage des Prüfverfahren zur Bestimmung der Kantenbeständigkeit
bords gegen Abplatzung
This Technical Specification (CEN/TS) was approved by CEN on 25 April 2010 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.






EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 843-9:2010: E
worldwide for CEN national Members.

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SIST-TS CEN/TS 843-9:2010
CEN/TS 843-9:2010 (E)
Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Principle and use .4
5 Method A: Direct force application .5
5.1 Apparatus .5
5.2 Test piece .6
5.3 Test procedure .7
5.4 Calculation of results .7
6 Method B: Sliding force application .8
6.1 Apparatus .8
6.2 Test piece .9
6.3 Test procedure .9
6.4 Calculation of results .9
7 Interferences . 10
8 Report . 10
Bibliography . 12

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CEN/TS 843-9:2010 (E)
Foreword
This document (CEN/TS 843-9:2010) has been prepared by Technical Committee CEN/TC 184 “Advanced
technical ceramics”, the secretariat of which is held by BSI.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus,
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
3

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CEN/TS 843-9:2010 (E)

1 Scope
This Technical Specification describes requirements and methods for undertaking tests to determine the
resistance of the edges of brittle ceramic materials to be damaged by chipping or flaking. It is limited to
homogeneous monolithic ceramics with flat surfaces and straight sharp or chamfered edges.
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 623-4, Advanced technical ceramics — Monolithic ceramics - General and textural properties - Part 4:
Determination of surface roughness
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)
EN ISO 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC
17025:2005)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
chip or flake
detached piece of material from the edge of a component or test piece
3.2
edge chipping or edge flaking
process of producing a chip or flake from the edge of a component or test piece
3.3
edge chip resistance
measure of the resistance of the edge of a component or test piece to chipping or flaking determined by
dividing the force applied by the maximum thickness of the flake or the distance of the centre of the applied
force from the edge at which it is formed
NOTE The term ‘edge toughness’ has an equivalent meaning.
4 Principle and use
Localised loading near the edge of a ceramic component can lead to spalling of the edge, and hence to loss of
function of the component. The test methods in this standard provide means of quantifying the resistance of a
ceramic product to edge damage, either by applying a monotonically increasing force to an indenter
positioned a fixed distance from the edge (Method A), or by applying a predetermined force to an indenter
positioned remotely from the edge, and dragging it towards the edge (Method B). In the case of method A, the
force required to cause an edge flake to form at a pre-determined position is recorded; while in the case of
Method B, the distance from the edge at which the flake is formed under a pre-determined force is measured.
4

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CEN/TS 843-9:2010 (E)
In both cases (see Figure 1), the force applied, F, divided by the distance from the edge at which the flake is
formed, d, commonly known as the ‘edge toughness’, is then a measure of edge chip resistance.
This test can also be used to determine the effectiveness of chamfers placed on edges. A chamfer prevents
direct loading near the edge. The size of the chamfer required for the component to withstand a given near-
edge loading can be determined by this test.
FF
w
d

  (a)      (b)
Key:
F Indenter applying force normal to plane
d maximum flake depth into bulk
w maximum flake width on face
Figure 1 — Schematic of indentation near an edge using a hard indenter (a) cross-sectional view of a
flake formed at an edge, and (b) flake shape viewed from edge side
5 Method A: Direct force application
5.1 Apparatus
5.1.1 General
The force required shall be applied by any suitable mechanical testing machine which operates either in a
constant displacement rate mode or in a constant force increase rate mode. The machine shall drive an
indenter (5.1.4) into the surface of a component or test piece at a pre-determined location near the edge until
the flake forms.
NOTE The mechanism of flake formation is thought be the preferred extension of those radial cracks emanating from
the indentation which are roughly parallel with the edge. Owing to the lack of elastic constraint near the edge, these
propagate sideways and into the material to form a shell-shaped crack, which once past a certain size becomes unstable
and forms a detached flake.
5

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5.1.2 Test machine
A mechanical testing machine shall be used, which is capable of applying a force to the test jig at a constant
displacement rate. The test machine shall be equipped for recording the load applied to the test jig at any point in
time, and preferably of capturing the peak force applied. The accuracy of the test machine shall be in accordance
with EN ISO 7500-1, Grade 1 (1 % of indicated load), and shall be capable of recording to a sensitivity of better
than 1 % of the maximum load employed. The calibration shall have recently been checked.
5.1.3 Test piece holder
The test-piece shall be held in a clamping device which enables the component or test piece to be held in a
fixed position in the testing machine (Figure 2). Preferably the clamping device incorporates two orthogonal
means of adjusting position so that the location of the indenter (5.1.4) can be adjusted precisely, e.g. using an
X-Y micrometer screw table which can be locked when indenting.
NOTE It is convenient to be able to view the indentation position by sighting normal to the indentation surface using a
microscope or other suitable device, e.g. by moving the indenter out of the line of sight. Such an arrangement permits the
indenter to be positioned an exact distance from the edge of the test piece.

1
2
3
4

1 Load cell 2 Indenter 3 Test piece or test items 4 X-Y lockable table
Figure 2 — Schematic of indentation technique for method A
5.1.4 Indenter
A sharp or a blunt diamond indenter shall be used for this test, as appropriate to requirements.
NOTE It is recommended that for reliability, especially in high force tests, a Rockwell geometry diamond (see EN
843-4) with a tip radius or 0,2 mm and manufactured from polycrystalline diamond is employed. If a Vickers or Knoop
diamond is used, ensure that the diagonal length of the indentation is consistently aligned with the edge of the test piece.
5.2 Test piece
The principal requirement is that the component or test piece to be tested has a flat surface which is capable
of being rigidly mounted with its normal parallel
...