Small Punch Test Method for Metallic Materials

This Code of Practice gives guidance on the procedure to be followed when carrying out
Small Punch Creep tests. The objectives of such tests are to evaluate the creep behaviour of
materials exposed in operating plant components in order to provide data needed for plant
life and integrity assessment. The Code of Practice primarily addresses metallic materials
tested under creep loading but can also be used for other materials. Determination of tensile
test data at elevated temperature can also be realised using the proposed methodology. But
the methodology applied in Part B of this document should be applied.
The scope of the Code of Practice covers the following:
Test Piece
Test pieces are discs of specified dimensions procured from components or any other
source. They may be homogeneous or contain manufacturing features such as for example
joints, weldments, defects or coatings
Load
The load may be applied to the disc from a pneumatic, hydraulic or any other mechanical
source. The Code of Practice particularly addresses the usual situation where the load is
maintained constant throughout the test, but the general principles apply also to tests where
the load is cycled, with dwell periods.
Temperature
The test temperature will usually be within the creep range for the materials under test. The
Code of Practice specifically addresses the usual situation where the temperature is
maintained constant throughout the test, but the general principles also apply to thermal
cycling with or without dwell periods.
Environment
The test pieces will usually be tested in an inert gas environment. However, the general
principles should also apply when other environments are used. Although special
precautions will be necessary where hazardous or corrosive environments are used, these
are not detailed in this document.

Preskusna metoda za kovinske materiale z uporabo majhnega bata (Small Punch Test)

General Information

Status
Withdrawn
Publication Date
18-Dec-2007
Withdrawal Date
21-Nov-2017
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
22-Nov-2017

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SLOVENSKI STANDARD
SIST CWA 15627:2008
01-marec-2008
Preskusna metoda za kovinske materiale z uporabo majhnega bata (Small Punch
Test)
Small Punch Test Method for Metallic Materials
Ta slovenski standard je istoveten z: CWA 15627:2007
ICS:
77.040.10
SIST CWA 15627:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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CEN
CWA 15627

WORKSHOP
December 2007


AGREEMENT

ICS 77.040.10     Supersedes CWA 15627:2006
English version


Small Punch Test Method for Metallic Materials
This CEN Workshop Agreement has been drafted and approved by a Workshop of representatives of interested parties, the constitution of
which is indicated in the foreword of this Workshop Agreement.

The formal process followed by the Workshop in the development of this Workshop Agreement has been endorsed by the National
Members of CEN but neither the National Members of CEN nor the CEN Management Centre can be held accountable for the technical
content of this CEN Workshop Agreement or possible conflicts with standards or legislation.

This CEN Workshop Agreement can in no way be held as being an official standard developed by CEN and its Members.

This CEN Workshop Agreement is publicly available as a reference document from the CEN Members National Standard Bodies.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.


Ref. No.:CWA 15627:2007 D/E/F

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CWA 15627:2007 (E)


CONTENTS

FOREWORD 4

PART A: A Code of Practice for Small Punch Creep Testing

0. INTRODUCTION 7

1. SCOPE 8

2. DEFINITIONS 8

3. APPARATUS 10
3.1 Test Rig 10
3.2 Loading System 10
3.3 Strain Measurement System 10
3.4 Heating System 11
3.5 Test Environment 11
3.6 Additional Measurements 11
3.7 Data Recording 11

4. TEST PIECES 11
4.1 Design 11
4.2 Manufacture and Metrology 12
4.3 Identification and Documentation 12

5 TEST PROCEDURE 12
5.1 Test Piece Installation 12
5.2 Determination Of Test Load 12
5.3 Application Of Load And Temperature 14
5.4 Monitoring and maintaining test conditions 14
5.5 Test interruption and termination 14
5.6 Post test examination 14
5.7 Data records 14

6 REPORT 15
6.1 Minimum requirements 15
6.2 Additional information

7 REFERENCES 16

ANNEX A1: Relationship to uniaxial creep test properties 20

ANNEX A2: Guidance on relevant technological issues: specimen sampling from
components 25
2

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CWA 15627:2007 (E)

Part B: A Code of Practice for Small Punch Testing for Tensile and Fracture
Behaviour
0. INTRODUCTION 39

1. SCOPE 40

2. DEFINITIONS 40

3. APPARATUS 42
3.1 Test Rig 42
3.2 Loading System 43
3.3 Displacement Measurement System 43
3.4 Deflection Measurement System 43
3.5 Heating or Cooling System 43
3.6 Test Environment 44
3.7 Additional Measurements 44
3.8 Data Recording 44

4. TEST SPECIMEN PREPARATION 44
4.1 Specimen for Small Punch Bulge Test 44
4.2 Specimen for Small Punch Drawing Test 45
4.3 Identification and Documentation 45

5 TEST TEMPERATURE CONSIDERATIONS 45

6 TEST PROCEDURE 45
6.1 Installation of the Test Specimen 45
6.2 Test Speed 46
6.3 Test Record 46

7 POST TEST EXAMINATION 47
7.1 Determination of the elastic plastic transition load 47
7.2 Determination of the SP Fracture Energy 48
7.3 Determination of the Effective Fracture Strain 48

8 TEST REPORT 49
8.1 Minimum Requirements 49
8.2 Additional Information 49

9 REFERENCES 50

ANNEX B1: Derivation of tensile and fracture material properties 52

ANNEX B2: Guidance on relevant technological issues: specimens sampling from
components      57

3

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CWA 15627:2007 (E)

Foreword

This CEN Workshop 21 on “Small Punch Test Method for Metallic Materials” has been established
and a Business Plan approved by a Workshop of representatives of interested parties on 2004-09-24
[1], the constitution of which was supported by CEN following the public call for participation made on
2004-09-08.
Following a decision from the Workshop, it has been decided to re-publish CWA 15627:2006 in order
to correct a typing error in a formula. This version corrects and supersedes the CWA pub
...

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