SIST EN ISO 7500-2:2000
(Main)Metallic materials - Verification of static uniaxial testing machines - Part 2: Tension creep testing machines - Verification of the applied load (ISO 7500-2:1996)
Metallic materials - Verification of static uniaxial testing machines - Part 2: Tension creep testing machines - Verification of the applied load (ISO 7500-2:1996)
Verification of testing machines used for uniaxial creep testing in tension in accordance with ISO 204. This part applies to dead weight and lever type creep testing machines.
Metallische Werkstoffe - Prüfung von Prüfmaschinen für statische einachsige Beanspruchung - Teil 2: Zeitstandprüfmaschinen für Zugprüfbeanspruchung - Prüfung der Prüfkraft (ISO 7500-2:1996)
Dieser Teil von ISO 7500 gilt für die Prüfung von Prüfmaschinen, die für Zeitstand-Zugversuche mit einachsiger Beanspruchung nach ISO 204 verwendet werden. Die Prüfung besteht aus - einer allgemeinen Untersuchung der Prüfmaschine, - einer Prüfung der durch die Prüfmaschine erzeugten Kraft. Diese Norm gilt für die Zeitstandprüfmaschinen mit direkter Gewichtsbelastung und für solche mit Hebelübersetzung. Prüfmaschinen mit einem Kraftmeßsystem müssen nach ISO 7500-1 geprüft werden.
Matériaux métalliques - Vérification des machines pour essais statiques uniaxiaux - Partie 2: Machines d'essai de fluage en traction - Vérification de la charge appliquée (ISO 7500-2:1996)
Kovinski materiali - Preverjanje statičnih enoosnih preskuševalnih strojev - 2. del: Stroji za natezno preskušanje lezenja - Preverjanje uporabljenih obtežitev (ISO 7500-2:1996)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 7500-2:2000
01-februar-2000
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6WURML]DQDWH]QRSUHVNXãDQMHOH]HQMD3UHYHUMDQMHXSRUDEOMHQLKREWHåLWHY ,62
Metallic materials - Verification of static uniaxial testing machines - Part 2: Tension creep
testing machines - Verification of the applied load (ISO 7500-2:1996)
Metallische Werkstoffe - Prüfung von Prüfmaschinen für statische einachsige
Beanspruchung - Teil 2: Zeitstandprüfmaschinen für Zugprüfbeanspruchung - Prüfung
der Prüfkraft (ISO 7500-2:1996)
Matériaux métalliques - Vérification des machines pour essais statiques uniaxiaux -
Partie 2: Machines d'essai de fluage en traction - Vérification de la charge appliquée
(ISO 7500-2:1996)
Ta slovenski standard je istoveten z: EN ISO 7500-2:1999
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 7500-2:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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INTERNATIONAL
IS0
STANDARD
7500-2
First edition
1996-l O-01
Metallic materials - Verification of static
uniaxial testing machines -
Part 2:
Tension creep testing machines - Verification
of the applied load
Ma t&iaux m6 talliques - V&fica tion des machines pour essais s ta tiques
uniaxiaux -
Partie 2: Machines d ’essai de fluage en traction - I/&-ification de la charge
appliquke
Reference number
IS0 7500-2:1996(E)
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IS0 7500-2: 1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide fed-
eration of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) on all matters of electrotechnical standardization.
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.
International Standard IS0 7500-Z was prepared by Technical Committee
ISO/TC 164, Mechanica/ testing of metals, Subcommittee SC 1, Uniaxial
testing.
IS0 7500 consists of the following parts, under the general title Metallic
materials - Verification of static uniaxial testing machines:
- Part I: Tensile testing machines
machines - Verification of the applied
- Part 2: Tension creep testing
load
Annex A forms an integral part of this part of IS0 7500.
0 IS0 1996
no part of this publication may be
All rights reserved. Unless otherwise specified,
reproduced or utilized in any form or by any means, electronic or mechanical, including
photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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~~ -
INTERNATIONAL STANDARD 0 IS0 IS0 7500-2: 1996(E)
Metallic materials - Verification of static uniaxial testing
machines -
Part 2:
Verification of the applied load
Tension creep testing machines -
IS0 376:1987, Metallic materials - Calibration of
1 Scope
force proving instruments used for the verification of
uniaxial testing machines.
This part of IS0 7500 specifies the verification of
testing machines used for uniaxial creep testing in
IS0 7500-I :I 986, Metallic materials - Verification of
tension in accordance with IS0 204.
static uniaxial testing machines - Part 7: Tensile
testing machines.
The verification consists of
- a general inspection of the testing machine;
3 Symbols and their meanings
- a verification of the load applied by the testing
machine. For the purposes of this part of IS0 7500, the symbols
given in table 1 shall apply.
This part of IS0 7500 applies to dead weight and lever
type creep testing machines. The machines with a For the purposes of this part of IS0 7500 the follow-
1) shall be verified in accord- ing types of creep testing machines are recognized:
load measuring system
ance with IS0 7500-I.
- deadweight machines, with or without guides
(see figures 1 and 2);
- overslung or underslung lever machines (see
2 Normative references
figures 3, 4 and 5);
The following standards contain provisions which,
- jockey weight machines, either with overslung or
through reference in this text, constitute provisions of
underslung lever (see figures 6 and 7);
this part of IS0 7500. At the time of publication, the
- any combination of the types of machines men-
editions indicated were valid. All standards are subject
tioned above (see figure 8).
to revision, and parties to agreements based on this
part of IS0 7500 are encouraged to investigate the
possibility of applying the most recent editions of the
4 General-inspection of the testing
standards indicated below. Members of IEC and IS0
machine
maintain registers of currently valid International Stan-
dards.
The verification of the testing machine shall only be
carried out if the machine is in good working order.
IS0 204:- 21, Metallic materials - Uniaxial creep
For this purpose, a general inspection of the machine
tes tlng in tension.
shall be carried out before verification of the load ap-
plied by the machine (see annex A).
1) For the purposes of this part of IS0 7500, a force measuring system comprises load cell plus conditioning plus indicator.
2) To be published. (Revision of ISO/R 204:1961 and ISO/R 206:1961)
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@ IS0
IS0 7500-2: 1996(E)
- Symbols and their meanings
Table 1
Meaning
Symbol Unit
N Maximum capacity of the load range of the testing machine
F/d
Load applied by the testing machine to be verified
N
Fi
- for deadweight machines: Fi = mg 1)
- for lever-type machines: Fi = mgR 1)
- for jockey weight machines, the value of Fi is indicated on the scale of the machine
F N True load indicated by the force-proving instrument
N Arithmetic mean of several measurements of F for the same discrete load
F
F N Highest or lowest value of F for the same discrete load
maxl Fmin
N Force exerted by the masses on the scale pan of the machine
FM
N Lower limit of the verified load range
FV
Lever ratio used for the verification
R
b % Relative repeatability error of the testing machine
d N Discrimination threshold
Discrimination threshold corresponding to 20 % of the maximum force range (FN)
N
4
% Relative discrimination threshold
a
% Relative accuracy error of the testing machine
4
1) g = local acceleration due to gravity, in metres per second squared.
Self alignment
Self alignment
joint
joint
Specimen
Specimen
Figure 2 - Schematic representation of the
Figure 1 - Schematic representation of the
operating principle of a deadweight tensile creep
operating principle of a deadweight tensile creep
testing machine with guides (example)
testing machine (example)
2
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IS0 7500-2: 1996(E)
Self alignment
joint
Spec imen
Figure 3 - Schematic representation of the operating principle of an overslung lever tensile creep
testing machine (example)
Figure 4 - Schematic representation of the operating principle of an underslung lever tensile creep
testing machine (example)
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IS0 7500-2: 1996(E) @ IS0
Self alignment
joint
L Specimen
Figure 5 - Schematic representation of the operating principle of an overslung double lever tensile
creep testing machine (example)
J r
9
,
m
b
Self alignment
t
joint
-4s 1
Specimen
Figure 6 - Schematic representation of the operating principle of an overslung lever tensile creep
testing machine with jockey weight (example)
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IS0 7500-2:1996(E)
Self alignment
/ joint
fl Specimen
Figure 7 - Schematic representation of the operating principle of an underslung double lever tensile creep
testing machine with jockey weight (example)
0 l
Self alignment
joint
Spec imen
Figure 8 - Schematic representation of the operating principle of a tensile creep testing machine using
a combination of different loading systems (example)
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0 IS0
ISO 7500-2: 1996(E)
d
5 Verification of the load applied by the
--x100
a-F
testing machine
and shall re main wit hin the limit s given in table 2 for
5.1 General
considered.
the class of machine
This verification shall be carried out for each of the
The discrimination threshold d shall be expressed in
load ranges used. if the testing machine has several
newtons
31, shall be regarded as a sep-
load ranges, each range
arate testing machine.
This verification shall be carried out using tension
5.4 Determination of the lower limit of
force-proving instruments. These instruments shall be
verification
in accordance with IS0 376. The class of the force-
proving instrument shall be equal to or superior to the
The lower limit of verification Fv shall be specified ac-
class determined for the creep testing machine.
cording to table 2.
5.2 Masses
Table 2 - Lower limit of verification
The masses used to apply the forces during verifica-
Class
I
tion shall be the masses normally used during testing,
400d,
0,5
which can be either:
1 ZOOd,
a) known masses with an accuracy equal to or bet-
2 IOOd,
ter than t 0,l %; verified at least every IO years,
NOTE - d, is the discrimination threshold corresponding to 1
or; I
1 20 % of the force measuring range.
I
b) masses dedicated for use with a given creep
testing machine applied in the same sequence as
during the test. NOTE 1 The lower limit of verification of the machine may
be less than the permissible operating range of the equiva-
lent grade force-proving instrument used to determine the
5.3 Determination of the discrimination
discrimination threshold at the 60 % and maximum load
threshold conditions.
Consequently, if one wishes to accurately verify the testing
The discrimination threshold d of the machine is de-
machine load at the lower end of the range as well, it will
fined as the smallest increment of force that can be
be necessary to employ two measuring instruments, one
applied and detected during the verification procedure.
fo
...
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