EN 10002-1:2001

Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature

This European Standard specifies the method for tensile testing of metallic materials and defines the mechanical properties which can be determined at ambient temperature.
NOTE   Informative annex A indicates complementary recommendations for computer controlled testing machines. It is the intention, based on further developments by manufacturers and users that annex A will become normative in the next revision of this standard.

Metallische Werkstoffe - Zugversuch - Teil 1: Prüfverfahren bei Raumtemperatur

Anwendungsbereich
Diese Europäische Norm legt den Zugversuch für metallische Werkstoffe fest. Es sind die mechanischen
Eigenschaftswerte, die mit dem Versuch bei Raumtemperatur bestimmt werden können, definiert.
ANMERKUNG Der informative Anhang A enthält zusätzliche Empfehlungen für die Anwendung rechnergestützter
Zugprüfmaschinen. Es ist vorgesehen, dass nach weiterer Entwicklung von Prüfmaschinenherstellern und Erfahrungen
von Anwendern der Anhang A bei der nächsten Überarbeitung dieser Norm normativ wird.

Matériaux métalliques - Essai de traction - Partie 1: Méthode d'essai à température ambiante

La présente Norme européenne spécifie la méthode d'essai de traction des matériaux métalliques et définit les caractéristiques mécaniques qu'elle permet de déterminer à la température ambiante.
NOTE   L'annexe informative A donne des recommandations complémentaires applicables aux machines d'essai de traction assistées par ordinateur. Il est envisagé, sur la base des développements futurs apportés par les producteurs et les utilisateurs, que l'annexe A devienne normative dans la prochaine révision de la présente norme.

Kovinski materiali - Natezni preskus - 1. del: Metoda preskušanja pri temperaturi okolice

General Information

• Status: Withdrawn
• Publication Date: 24-Jul-2001
• Withdrawal Date: 14-Aug-2009
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Drafting Committee: ECISS/TC 1 - Steel - Mechanical testing
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 15-Aug-2009
• Completion Date: 15-Aug-2009
• Mandate: M/BC/CEN/86/1 - ECISS - 1st programme
• Ref Project: SIST EN 10002-1:2002 - Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature

Relations

• Replaces: EN 10002-1:1990/AC1:1990 - Metallic materials - Tensile testing - Part 1: Method of test (at ambient temperature)
• Effective Date: 22-Dec-2008
• Replaced By: EN ISO 6892-1:2009 - Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-1:2009)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 10002-1:2002
01-junij-2002

Kovinski materiali - Natezni preskus - 1. del: Metoda preskušanja pri temperaturi

okolice

Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature

Metallische Werkstoffe - Zugversuch - Teil 1: Prüfverfahren bei Raumtemperatur

Matériaux métalliques - Essai de traction - Partie 1: Méthode d'essai a température

ambiante
Ta slovenski standard je istoveten z: EN 10002-1:2001
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN 10002-1:2002 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 10002-1:2002
---------------------- Page: 2 ----------------------
SIST EN 10002-1:2002
EUROPEAN STANDARD
EN 10002-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2001
ICS 77.040.10 Supersedes EN 10002-1:1990
English version
Metallic materials - Tensile testing - Part 1: Method of test at
ambient temperature

Matériaux métalliques - Essai de traction - Partie 1: Metallische Werkstoffe - Zugversuch - Teil 1: Prüfverfahren

Méthode d'essai à température ambiante bei Raumtemperatur
This European Standard was approved by CEN on 12 May 2001.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,

Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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

© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10002-1:2001 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
Contents
page

Foreword......................................................................................................................................................................4

1 Scope ..............................................................................................................................................................5

2 Normative references ....................................................................................................................................5

3 Principle..........................................................................................................................................................5

4 Definitions.......................................................................................................................................................5

5 Symbols and designations ...........................................................................................................................8

6 Test piece......................................................................................................................................................10

6.1 Shape and dimensions................................................................................................................................10

6.2 Types.............................................................................................................................................................11

6.3 Preparation of test pieces...........................................................................................................................11

7 Determination of original cross-sectional area (S ).................................................................................11

8 Marking the original gauge length (L )......................................................................................................12

9 Accuracy of testing apparatus ...................................................................................................................12

10 Conditions of testing ...................................................................................................................................12

10.1 Method of gripping ......................................................................................................................................12

10.2 Test rate ........................................................................................................................................................12

11 Determination of percentage elongation after fracture (A) .....................................................................13

12 Determination of the percentage total elongation at maximum force (A )...........................................14

13 Determination of proof strength, non proportional extension (R )........................................................14

14 Determination of proof strength, total extension (R ) ..............................................................................15

15 Method of verification of permanent set strength (R ).............................................................................15

16 Determination of percentage reduction of area (Z) ..................................................................................15

17 Test report ....................................................................................................................................................15

Annex A (informative) Recommendations concerning the use of computer controlled tensile testing

machines.......................................................................................................................................................28

Annex B (normative) Types of test pieces to be used for thin products : sheets, strips and flats

between 0,1 mm and 3 mm thick................................................................................................................33

Annex C (normative) Types of test pieces to be used for wire, bars and sections with a diameter or

thickness of less than 4 mm.......................................................................................................................35

Annex D (normative) Types of test pieces to be used for sheets and flats of thickness equal to or

greater than 3 mm, and wire, bars and sections of diameter or thickness equal to or greater

than 4 mm .....................................................................................................................................................36

---------------------- Page: 4 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)

Annex E (normative) Types of test pieces to be used for tubes...........................................................................39

Annex F (informative) Measuring the percentage elongation after fracture if the specified value is less

than 5 % ........................................................................................................................................................41

Annex G (informative) Measurement of percentage elongation after fracture based on subdivision of

the original gauge length ............................................................................................................................42

Annex H (informative) Manual method of determination of the percentage total elongation at maximum

force for long products such as bars, wire, rods .....................................................................................44

Annex J (informative) Precision of tensile testing and estimation of the uncertainty of measurement...........45

Bibliography ..............................................................................................................................................................56

---------------------- Page: 5 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
Foreword

This European Standard has been prepared by Technical Committee ECISS/TC 1 "Steel - Mechanical testing", the

secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical text or

by endorsement, at the latest by January 2002, and conflicting national standards shall be withdrawn at the latest

by January 2002.
This European Standard supersedes EN 10002-1:1990.

The European Standard EN 10002-1 "Metallic materials - Tensile testing - Part 1: Method of test (at ambient

temperature)" was approved by CEN on 27 November 1989.
After a first 5 years lifetime, ECISS decided to revise this standard.

The revised prEN 10002-1 was discussed during two meetings of ECISS/TC1/SC1 with the participation of 4 CEN

member countries (Belgium, France, Germany, United Kingdom).
EN 10002 was composed of five parts :
Part 1 : Method of test (at ambient temperature)

Part 2 : Verification of the force measuring system of the tensile testing machines

Part 3 : Calibration of force proving instruments used for the verification of uniaxial testing machines

Part 4 : Verification of extensometers used in uniaxial testing
Part 5 : Method of testing at elevated temperature

NOTE Part 2 has been already replaced by EN ISO 7500-1. Parts 3 and 4 will be replaced by corresponding ISO

standards.

The annexes B, C, D and E are normative. The annexes A, F, G, H and J are informative.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,

France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,

Switzerland and the United Kingdom.
---------------------- Page: 6 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
1 Scope

This European Standard specifies the method for tensile testing of metallic materials and defines the mechanical

properties which can be determined at ambient temperature.

NOTE Informative annex A indicates complementary recommendations for computer controlled testing machines. It is the

intention, based on further developments by manufacturers and users that annex A will become normative in the next revision of

this standard.
2 Normative references

This European Standard incorporates by dated or undated reference, provisions from other publications. These

normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For

dated references, subsequent amendments to or revisions of any of these publications apply to this European

Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the

publication referred to applies (including amendments).

EN 10002-4, Metallic materials - Tensile testing - Part 4: Verification of extensometers used in uniaxial testing.

EN 20286-2, ISO system of limits and fits - Part 2 : Tables of standard tolerances grades and limits deviations for

holes and shafts (ISO 286-2:1988).

EN ISO 377, Steel and steel products - Location of samples and test pieces for mechanical testing (ISO 377:1997).

EN ISO 2566-1, Steel conversion of elongation values - Part 1 : Carbon and alloy steels (ISO 2566-1:1984).

EN ISO 2566-2, Steel conversion of elongation values - Part 2 : Austenitic steels (ISO 2566-2:1984).

EN ISO 7500-1, Metallic materials - Verification of static uniaxial testing machines – Part 1: Tension/compression

testing machines – Verification and calibration of force measuring (ISO 7500-1:1999).

3 Principle

The test involves straining a test piece in tension, generally to fracture, for the purpose of determining one or more

of the mechanical properties defined in clause 4.

The test is carried out at ambient temperature between 10 °C and 35 °C, unless otherwise specified. Tests carried

out under controlled conditions shall be made at a temperature of 23 °C ± 5 °C.
4 Terms and definitions

For the purpose of this European Standard, the following terms and definitions apply :

4.1
gauge length (L)

length of the cylindrical or prismatic portion of the test piece on which elongation is measured. In particular, a

distinction is made between :
4.1.1
original gauge length (L )
gauge length before application of force
4.1.2
final gauge length (L )
gauge length after rupture of the test piece (see 11.1)
4.2
parallel length (L )
parallel portion of the reduced section of the test piece
---------------------- Page: 7 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)

NOTE The concept of parallel length is replaced by the concept of distance between grips for non-machined test pieces.

4.3
elongation
increase in the original gauge length (L ) at any moment during the test
4.4
percentage elongation
elongation expressed as a percentage of the original gauge length (L )
4.4.1
percentage permanent elongation

increase in the original gauge length of a test piece after removal of a specified stress (see 4.9), expressed as a

percentage of the original gauge length (L )
4.4.2
percentage elongation after fracture (A)

permanent elongation of the gauge length after fracture (L - L ), expressed as a percentage of the original gauge

u o
length (L )

NOTE In the case of proportional test pieces, only if the original gauge length is other than 5,65 S where S is the

o o

original cross-sectional area of the parallel length, the symbol A should be supplemented by an index indicating the coefficient

of proportionality used, for example :
A = percentage elongation of a gauge length (L ) of 11,3 S .
11,3 o o

In the case of non-proportional test pieces, the symbol A should be supplemented by an index indicating the original gauge

length used, expressed in millimetres, for example :
A = percentage elongation of a gauge length (L ) of 80 mm.
80 mm o
4.4.3
percentage total elongation at fracture (A )

total elongation (elastic elongation plus plastic elongation) of the gauge length at the moment of fracture expressed

as a percentage of the original gauge length (L )
4.4.4
percentage elongation at maximum force

increase in the gauge length of the test piece at maximum force, expressed as a percentage of the original gauge

L )
length (

NOTE A distinction is made between the percentage total elongation at maximum force (A ) and the percentage non-

gt
proportional elongation at maximum force (A ) (see Figure 1).
4.5
extensometer gauge length (L )

length of the parallel portion of the test piece used for the measurement of extension by means of an extensometer

NOTE It is recommended that for measurement of yield and proof strength parameters L
L /2. It is further

e o

recommended that for measurement of parameters "at" or "after" maximum force, L is approximately equal to L .

e o
4.6
extension
increase in the extensometer gauge length (L ) at a given moment of the test
5,65 S = 5 .
---------------------- Page: 8 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
4.6.1
percentage permanent extension

increase in the extensometer gauge length, after removal from the test piece of a specified stress, expressed as a

percentage of the extensometer gauge length (L )
4.6.2
percentage yield point extension (A )

in discontinuous yielding materials, the extension between the start of yielding and the start of uniform work

hardening
NOTE It is expressed as a percentage of the extensometer gauge length (L ).
4.7
percentage reduction of area (Z)

maximum change in cross-sectional area which has occurred during the test (S - S ) expressed as a percentage

o u
of the original cross-sectional area (S )
4.8
maximum force (F )

the greatest force which the test piece withstands during the test once the yield point has been passed

For materials, without yield point, it is the maximum value during the test.
4.9
stress

force at any moment during the test divided by the original cross-sectional area (S ) of the test piece

4.9.1
tensile strength (R )
stress corresponding to the maximum force (F )
4.9.2
yield strength

when the metallic material exhibits a yield phenomenon, stress corresponding to the point reached during the test

at which plastic deformation occurs without any increase in the force. A distinction is made between :

4.9.2.1
upper yield strength ( )

value of stress at the moment when the first decrease in force is observed (see Figure 2)

4.9.2.2
lower yield strength (R )

lowest value of stress during plastic yielding, ignoring any initial transient effects (see Figure 2)

4.9.3
proof strength, non-proportional extension (R )

stress at which a non-proportional extension is equal to a specified percentage of the extensometer gauge length

(L ) (see Figure 3)

NOTE The symbol used is followed by a suffix giving the prescribed percentage, for example : R

p0,2.
4.9.4
proof strength, total extension (R )

stress at which total extension (elastic extension plus plastic extension) is equal to a specified percentage of the

extensometer gauge length (L ) (see Figure 4)

NOTE The symbol used is followed by a suffix giving the prescribed percentage for example : R

t0,5.
---------------------- Page: 9 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
4.9.5
permanent set strength (R )

stress at which, after removal of force, a specified permanent elongation or extension expressed respectively as a

percentage of the original gauge length (L ) or extensometer gauge length (L ) has not been exceeded (see

o e
Figure 5)

NOTE The symbol used is followed by a suffix giving the specified percentage of the original gauge length (L ) or of the

extensometer gauge length (L ), for example : R
e r0,2.
4.10
fracture

phenomena which is deemed to occur when total separation of the test piece occurs or force decreases to become

nominally zero
5 Symbols and designations
Symbols and corresponding designations are given in Table 1.
---------------------- Page: 10 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
Table 1 — Symbols and designations
Reference Symbol Unit Designation
number
Test piece
1 b mm Thickness of a flat test piece or wall thickness of a tube

2 b mm Width of the parallel length of a flat test piece or average width of the longitudinal strip

taken from a tube or width of flat wire

3 d mm Diameter of the parallel length of a circular test piece, or diameter of round wire or

internal diameter of a tube
4 D mm External diameter of a tube
5 mm Original gauge length
L A
- ' mm Initial gauge length for determination of (see annex H)
o g
6 L mm Parallel length
- mm Extensometer gauge length
7 L mm Total length of test piece
8 mm Final gauge length after fracture
L' Final gauge length after fracture for determination of A (see annex H)
- mm
u g
9 S mm Original cross-sectional area of the parallel length
10 S mm Minimum cross-sectional area after fracture
- k - Coefficient of proportionality
11 Z %
S  S
o u
Percentage reduction of area : 100
12 - - Gripped ends
Elongation
13 - mm Elongation after fracture :
L – L
u o
14 % Percentage elongation after fracture :
LL
× 100
15 A % Percentage yield point extension
- L mm Extension at maximum force
16 A % Percentage non-proportional elongation at maximum force (F
g m)
17 A % Percentage total elongation at maximum force (F
gt m)
18 A % Percentage total elongation at fracture
19 - % Specified percentage non-proportional extension
20 - % Percentage total extension (see R )
21 - % Specified percentage permanent set extension or elongation
"continued"
---------------------- Page: 11 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
Table 1 (concluded)
Reference Symbol Unit Designation
number
Force
22 F N Maximum force
Yield strength - Proof strength - Tensile strength
R d
23 Upper yield strength
eH MPa
24 MPa Lower yield strength
25 R MPa Tensile strength
26 R MPa Proof strength, non-proportional extension
27 R MPa Permanent set strength
R MPa
28 Proof strength, total extension
- E MPa Modulus of elasticity
See Figures 1 to 13.
b The symbol T is also used in steel tube product standards.
c See 4.4.2.
d 1 MPa = 1 N/mm .
6 Test piece
6.1 Shape and dimensions
6.1.1 General

The shape and dimensions of the test pieces depend on the shape and dimensions of the metallic product from

which the test pieces are taken.

The test piece is usually obtained by machining a sample from the product or a pressed blank or casting. However

products of constant cross-section (sections, bars, wires, etc.) and also as cast test pieces (i.e. for cast irons and

non-ferrous alloys) may be tested without being machined.

The cross-section of the test pieces may be circular, square, rectangular, annular or, in special cases, of some

other shape.

Test pieces, the original gauge length of which is related to the original cross-sectional area by the equation

L k S are called proportional test pieces. The internationally adopted value for k is 5,65. The original gauge

o = o

length shall be not less than 20 mm. When the cross-sectional area of the test piece is too small for this

requirement to be met with the coefficient k value of 5,65, a higher value (preferably 11,3) or a non-proportional test

piece may be used.

In the case of non-proportional test pieces, the original gauge length (L ) is taken independently of the original

cross-sectional area (S ).

The dimensional tolerances of the test pieces shall be in accordance with the appropriate annexes (see 6.2).

6.1.2 Machined test pieces

Machined test pieces shall incorporate a transition curve between the gripped ends and the parallel length if these

have different dimensions. The dimensions of this transition radius may be important and it is recommended that

they be defined in the material specification if they are not given in the appropriate annex (see 6.2).

---------------------- Page: 12 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)

The gripped ends may be of any shape to suit the grips of the testing machine. The parallel length (L ) or, in the

case where the test piece has no transition curve, the free length between the grips, shall always be greater than

the original gauge length (L ).
6.1.3 Non-machined test pieces

If the test piece consists of an unmachined length of the product or of an unmachined test bar, the free length

between the grips shall be sufficient for gauge marks to be at a reasonable distance from the grips (see annexes B

to E).

As-cast test pieces shall incorporate a transition radius between the gripped ends and the parallel length. The

dimensions of this transition radius are important and it is recommended that they be defined in the product

standard. The gripped ends may be of any shape to suit the grips of the testing machine. The parallel length (L )

shall always be greater than the original gauge length (L ).
6.2 Types

The main types of test pieces are defined in annexes B to E according to the shape and type of product, as shown

in Table 2. Other types of test pieces can be specified in product standards.
Table 2 — Main types of test piece according to the product type
Type of product
Sheets – Plates – Wire - Bars – Sections
Flats
Corresponding
annex
With a thickness in with a diameter or side in millimetres of
millimetres of
0,1  thickness < 3
-< 4 C
> 3 D

4
Tubes E
6.3 Preparation of test pieces

The test pieces shall be taken and prepared in accordance with the requirements of the relevant European

Standards for the different materials (e.g. EN ISO 377, etc.).
7 Determination of original cross-sectional area (S )

The original cross-sectional area shall be calculated from the measurements of the appropriate dimensions. The

accuracy of this calculation depends on the nature and type of the test piece. It is indicated in annexes B to E for

the different types of test pieces.
---------------------- Page: 13 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
8 Marking the original gauge length (L )

Each end of the original gauge length shall be marked by means of fine marks or scribed lines, but not by notches

which could result in premature fracture.

For proportional test pieces, the calculated value of the original gauge length may be rounded off to the nearest

multiple of 5 mm, provided that the difference between the calculated and marked gauge length is less than

10 % of L . The original gauge length shall be marked to an accuracy of ± 1 %.

If the parallel length (L ) is much greater than the original gauge length, as, for instance, with unmachined test

pieces, a series of overlapping gauge lengths may be marked.

In some cases, it may be helpful to draw, on the surface of the test piece, a line parallel to the longitudinal axis,

along which the gauge lengths are marked.
9 Accuracy of testing apparatus

The force-measuring system of the testing machine shall be calibrated in accordance with EN ISO 7500-1 and shall

be at least of class 1.

When an extensometer is used it shall be at least of class 1 (according to EN 10002-4) for the determination proof

strength (non-proportional extension) ; for other properties (with higher extension) a class 2 extensometer

(according to EN 10002-4) can be used.

NOTE For the determination of upper and lower yield strengths, the use of an extensometer is not necessary.

10 Conditions of testing
10.1 Method of gripping

The test pieces shall be held by suitable means such as wedges, screwed grips, parallel jaw faces, shouldered

holders, etc.

Every endeavour should be made to ensure that test pieces are held in such a way that the tension is applied as

axially as possible, in order to minimize bending. This is of particular importance when testing brittle materials or

when determining proof strength (non-proportional extension) or proof strength (total extension) or yield strength.

NOTE In order to obtain a straight test piece and assure the alignment of the test piece and grip arrangement, a

preliminary force may be applied provided it does not exceed a value corresponding to 5 % of the specified or expected yield

strength. A correction of the extension should only be carried out to take into account the effect of the preliminary force.

10.2 Test rate
10.2.1 General

Unless otherwise specified in the product standard, the test rate shall conform to the following requirements

depending on the nature of the material.

NOTE The stress rates in Table 3 and the strain rates referred to throughout 10.2 do not imply specific modes of control by

the testing machine.
10.2.2 Yield and proof strengths
10.2.2.1 Upper yield strength (R )

Within the elastic range and up to the upper yield strength, the rate of separation of the crossheads of the machine

shall be kept as constant as possible and within the limits corresponding to the stress rates in Table 3.

---------------------- Page: 14 ----------------------
SIST EN 10002-1:2002
EN 10002-1:2001 (E)
Table 3 — Stress rate
Modulus of elasticity of Stress rate
the material (E)
MPa
MPa s
min max
< 150 000 2 20
660

150 000
10.2.2.2 Lower yield strength (R )

If only the lower yield strength is being determined, the strain rate during yield of the parallel length of the test piece

-1 -1

shall be between 0,000 25 s and 0,002 5 s . The strain rate within the parallel length shall be kept as constant as

possible. If this rate cannot be regulated directly, it shall be fixed by regulating the stress rate just before yield

begins, the controls of the machine not being further adjusted until completion of yield.

In no case, the stress rate in the elastic range shall exceed the maximum rates given in Table 3.

10.2.2.3 Upper and lower yield strengths (R and R )
eH eL

If the two yield strengths are determined during the same test, the conditions for determining the lower yield

strength shall be complied with (see 10.2.2.2).

10.2.2.4 Proof strength (non-proportional extension) and proof strength (total extension) (R and R )

p t
The stress rate shall be within the limits given in Table 3.

Within the plastic range and up to the proof strength (non-proportional extension or total extension) the strain rate

shall not exceed 0,002 5 s .

10.2.2.5 If the testing machine is not capable of measuring or controlling the strain rate, a cross head

separation speed equivalent to the stress rate given in Table 3 shall be used until completion of yield.

10.2.3 Tensile strength (R )

After determination of the required yield/proof strength properties the test rate may be increased to a strain rate (or

equivalent crosshead separation rate) to no greater than 0,008 s .

If only the tensile strength of the material is required to be measured, the test rate shall not exceed 0,008 s

throughout the test.
11 Determination of percentage elongation after fracture (A)

11.1 Percentage elongation after fracture shall be determined in accordance with the definition given in 4.4.2.

For this purpose, the two broken pieces of the test piece are carefully fitted back together so that their axes lie in a

straight line.
Special precautions shall be
...