Metallic materials — Fatigue testing — Variable amplitude fatigue testing — Part 2: Cycle counting and related data reduction methods

ISO 12110-2:2013 presents cycle counting techniques and data reduction methods which are used in variable amplitude fatigue testing. For each test or test series, cycle counting is mandatory whereas data reduction methods are optional. ISO 12110-2:2013 supports ISO 12110-1 which contains the general principles and describes the common requirements about variable amplitude fatigue testing. ISO 12110-2:2013, the term "loading" refers either to force, stress, or strain since the methods presented here are valid for all. The following issues are not within the scope of this document and therefore are not addressed: constant amplitude tests with isolated overloads or underloads; large components or structures; environmental effects like corrosion, creep, etc. linked to temperature/time interactions leading to frequency and waveform effects; multiaxial loading.

Matériaux métalliques — Essais de fatigue — Essais sous amplitude variable — Partie 2: Méthodes de comptage des cycles et méthodes associées de réduction des données

General Information

Status
Published
Publication Date
24-Jun-2013
Current Stage
9060 - Close of review
Start Date
04-Mar-2029
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ISO 12110-2:2013 - Metallic materials -- Fatigue testing -- Variable amplitude fatigue testing
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INTERNATIONAL ISO
STANDARD 12110-2
First edition
2013-07-01
Metallic materials — Fatigue testing —
Variable amplitude fatigue testing —
Part 2:
Cycle counting and related data
reduction methods
Matériaux métalliques — Essais de fatigue — Essais sous
amplitude variable —
Partie 2: Méthodes de comptage des cycles et méthodes associées de
réduction des données
Reference number
ISO 12110-2:2013(E)
©
ISO 2013

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ISO 12110-2:2013(E)

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© ISO 2013
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ii © ISO 2013 – All rights reserved

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ISO 12110-2:2013(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Cycle counting techniques . 2
4.1 General . 2
4.2 Cycle counting methods . 3
5 Counting technique selection . 7
Annex A (informative) Rainflow counting . 8
Annex B (informative) Examples of quantification, cycle extraction, and open cycle sequence
composition of cycles .21
Annex C (informative) Example of result presentation for the Rainflow counting method .26
Bibliography .32
© ISO 2013 – All rights reserved iii

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ISO 12110-2:2013(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
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may
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