ISO 28704:2011

Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for cyclic bending fatigue of porous ceramics at room temperature

ISO 28704:2011 spedifies a test method for determining the cyclic four-point bending fatigue of porous ceramics in air at room temperature.

Céramiques techniques — Méthode d'essai de fatigue par flexion cyclique des céramiques poreuses à température ambiante

General Information

• Status: Published
• Publication Date: 04-Aug-2011
• ICS: 81.060.30 - Advanced ceramics
• Technical Committee: ISO/TC 206 - Fine ceramics
• Drafting Committee: ISO/TC 206 - Fine ceramics
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 17-Mar-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 28704
First edition
2011-08-15
Fine ceramics (advanced ceramics,
advanced technical ceramics) — Test
method for cyclic bending fatigue of
porous ceramics at room temperature
Céramiques techniques — Méthode d’essai de fatigue par flexion
cyclique des céramiques poreuses à température ambiante
Reference number
ISO 28704:2011(E)
©
ISO 2011

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ISO 28704:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2011
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ii © ISO 2011 – All rights reserved

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ISO 28704:2011(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Testing machine and equipment . 3
4.1 Testing machine . 3
4.2 Loading precision . 3
4.3 Test fixture . 4
4.4 Micrometer callipers for measurement of external dimensions . 4
4.5 Dial gauge . 4
4.6 Vernier callipers . 4
5 Test piece . 5
5.1 Test piece size . 5
5.2 Test piece preparation . 5
6 Test method . 5
6.1 Waveform of loading stress . 5
6.2 Loading method . 5
6.3 Number of cycles for interruption . 6
6.4 Reuse of test piece . 6
6.5 Recommended test procedure in fatigue test . 6
6.6 Test environment . 6
7 Treatment of test result . 6
7.1 Maximum stress . 6
7.2 Number of cycles to failure . 7
7.3 S-N plot . 7
8 Test report . 7
© ISO 2011 – All rights reserved iii

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ISO 28704:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 28704 was prepared by Technical Committee ISO/TC 206, Fine ceramics.
iv © ISO 2011 – All rights reserved

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INTERNATIONAL STANDARD ISO 28704:2011(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Test method for cyclic bending fatigue of porous
ceramics at room temperature
1 Scope
This International Standard spedifies a test method for determining the cyclic four-point bending fatigue of
porous ceramics in air at room temperature.
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.
ISO 463, Geometrical Product Specifications (GPS) — Dimensional measuring equipment — Design and
metrological characteristics of mechanical dial gauges
ISO 1101, Geometrical Product Specifications (GPS) — Geometrical tolerancing — Tolerancing of form,
orientation, location and run-out
ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for
external measurements — Design and metrological characteristics
ISO 3599, Vernier callipers reading to 0,1 and 0,05 mm
ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions
and surface texture parameters
ISO 14704, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for flexural
strength of monolithic ceramics at room temperature
ISO 20507, Fine ceramics (advanced ceramics, advanced technical ceramics) — Vocabulary
ISO 22214, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for cyclic bending
fatigue of monolithic ceramics at room temperature
ISO 80000-1, Quantities and units — Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 20507 and the following apply.
3.1
porous fine ceramics
ceramics with a porosity of typically 30 % to 60 % and a pore diameter of 1 µm to 100 µm, for applications such as
filters, catalyst carriers, humidity sensors or molecular sieves, excluding structured honeycomb cellular channels
3.2
fatigue test
test wherein a test piece is subjected to repeated stressing to a set stress level, and the number of cycles to
fracture is determined
© ISO 2011 – All rights reserved 1

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ISO 28704:2011(E)
3.3
four-point bending stress
maximum value of stress generated in flexure in a bar-shaped test piece when supported at two support points
near its ends and loaded symmetrically by two loading points between them
3.4
cyclic stress
stress which is simply and cyclically loaded between a specific maximum value and a specific minimum value
(see Figure 1)
3.5
maximum stress
s
max
maximum value of cyclic stress (see Figure 1)
3.6
minimum stress
s
min
minimum value of cyclic stress (see Figure 1)
Y
σ
max
2
σ
min
1
X
Key
X time
Y stress
1 s
min
2 s
max
Figure 1 — Cyclic stress
3.7
minimum to maximum stress ratio
R
ratio of minimum stress to maximum stress
σ
min
R = (1)
σ
max
3.8
number of cycles
n
number of cycles of stress in the fatigue test
3.9
number of cycles to failure
N
number of cycles of stress until fatigue failure occurs
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ISO 28704:2011(E)
3.10
failure time
loading time until fatigue failure occurs
3.11
S-N plot
diagram wherein the maximum stress, S, is taken as an ordinate and the fracture number of cycles, N, is taken
as an abscissa
NOTE An example is given in Figure 2, where the number attached to the data point indicates the number of test
pieces and the data with a right-pointing arrow indicates a “run-out”.
Y
-1 0 1 2 3 4 5 6
10 10 10 10 10 10 10 10 X2
50
40 2
2
30
2
20
10
0 1 2 3 4 5 6 7 8
X1
10 10 10 10 10 10 10 10 10
Key
X1 number of cycles to failure, N
X2 time to failure (s)
Y maximum stress (MPa)
2 number of superimposed points
Figure 2 — Example of S-N plot
4 Testing machine and equipment
4.1 Testing machine
A testing machine shall be so constructed that a cyclic bending stress can be applied to a test piece, and a
force or m
...