|
oSIST prEN ISO 1288-2:2007
01-november-2007
6WHNORYJUDGEHQLãWYX8JRWDYOMDQMHXSRJLEQHWUGQRVWLVWHNODGHO 0HWRGD
VRRVQHJDGYRMQHJDREURþDQDUDYQHPVWHNOX]YHOLNLPLSRYUãLQDPL ,62',6
Glazing in building - Determination of the bending strength of glass - Part 2: Coaxial
double-ring test on flat specimens with large test surface areas (ISO/DIS 1288-2:2007)
Glas im Bauwesen - Bestimmung der Biegefestigkeit von Glas - Teil 2: Doppelring -
Biegeversuch an plattenförmigen Proben mit großen Prüfflächen (ISO/DIS 1288-2:2005)
Verre dans la construction - Détermination de la résistance du verre a la flexion - Partie
2: Essais avec doubles anneaux concentriques sur éprouvettes planes, avec de grandes
surfaces de sollicitation (ISO/DIS 1288-2:2007)
Ta slovenski standard je istoveten z: prEN ISO 1288-2
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
oSIST prEN ISO 1288-2:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
DRAFT
prEN ISO 1288-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2007
ICS 81.040.20 Will supersede EN 1288-2:2000
English Version
Glazing in building - Determination of the bending strength of
glass - Part 2: Coaxial double-ring test on flat specimens with
large test surface areas (ISO/DIS 1288-2:2007)
Verre dans la construction - Détermination de la résistance
du verre à la flexion - Partie 2: Essais avec doubles
anneaux concentriques sur éprouvettes planes, avec de
grandes surfaces de sollicitation (ISO/DIS 1288-2:2007)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 129.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 CEN Management Centre has the
same status as the official versions.
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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
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 Ref. No. prEN ISO 1288-2:2007: E
worldwide for CEN national Members.
---------------------- Page: 2 ----------------------
prEN ISO 1288-2:2007 (E)
Contents Page
Foreword.3
2
---------------------- Page: 3 ----------------------
prEN ISO 1288-2:2007 (E)
Foreword
This document (prEN ISO 1288-2:2007) has been prepared by Technical Committee ISO/TC 160 "Glass in
building" in collaboration with Technical Committee CEN/TC 129 “Glass in building” the secretariat of which is
held by NBN.
This document is currently submitted to the parallel Enquiry.
This document will supersede EN 1288-2:2000.
Endorsement notice
The text of ISO/DIS 1288-2:2007 has been approved by CEN as a prEN ISO 1288-2:2007 without any
modification.
3
---------------------- Page: 4 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 1288-2.2
ISO/TC 160/SC 2 Secretariat: ANSI
Voting begins on Voting terminates on
2007-08-02 2008-01-02
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Glazing in building — Determination of the bending strength of
glass —
Part 2:
Coaxial double-ring test on flat specimens with large test surface
areas
Verre dans la construction — Détermination de la résistance du verre à la flexion —
Partie 2: Essais avec doubles anneaux concentriques sur éprouvettes planes, avec de grandes surfaces de
sollicitation
ICS 81.040.20
ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a
subject of interest to European standardization. In accordance with the ISO-lead mode of
collaboration as defined in the Vienna Agreement, consultation on this ISO/DIS has the same
effect for CEN members as would a CEN enquiry on a draft European Standard. Should this draft
be accepted, a final draft, established on the basis of comments received, will be submitted to a
parallel two-month FDIS vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated
in the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est
distribué en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO
AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH
REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY
ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2007
---------------------- Page: 5 ----------------------
ISO/DIS 1288-2.2
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading
this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in
this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the
unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be reproduced,
stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying, recording or
otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s member
body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [email protected]
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2007 – All rights reserved
---------------------- Page: 6 ----------------------
prEN/ISO 1288-2
Contents
Foreword
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Symbols (and abbreviated terms).2
5 Principle of test method.3
6 Apparatus .3
6.1 Testing machine .3
6.2 Loading device.6
6.3 Measuring instruments .6
7 Sample.6
7.1 Shape and dimensions of the specimens.6
7.2 Sampling and preparation of specimens .7
7.3 Number of specimens .7
8 Procedure.7
8.1 Temperature .7
8.2 Humidity.7
8.3 Thickness measurement.7
8.4 Base plate.8
8.5 Positioning of specimen and loading ring.8
8.6 Load application .8
8.7 Loading rate .8
8.8 Location of the origin.9
8.9 Assessment of residual stresses.9
9 Evaluation.9
9.1 Limitation of the evaluation.9
9.2 Calculation of bending strength .9
10 Test report.11
Annex A (informative) Example of a device for keeping the gas pressure, p, in line with the piston
force, F.13
Bibliography.16
© ISO 1999 – All rights reserved iii
DRAFT 2007
---------------------- Page: 7 ----------------------
prEN/ISO 1288-2
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 3.
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 part of EN ISO 1288 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard EN ISO 1288-2 was prepared by Technical Committee ISO/TC 160, Glass in building,
Subcommittee SC 2, Use considerations in conjunction with Technical Committee CEN/TC 129, Glass in building.
EN ISO 1288 consists of the following parts, under the general title Glass in building — Determination of the
bending strength of glass:
⎯ Part 1: Fundamentals of testing glass
⎯ Part 2: Coaxial double ring test on flat specimens with large test surface areas
⎯ Part 3: Test with specimen supported at two points (four point bending)
⎯ Part 4: Testing of channel shaped glass
⎯ Part 5: Coaxial double ring test on flat specimens with small test surface areas
This Standard has been based on EN 1288-2 Glass in building - Determination of the bending strength of glass" -
Part 2 : Coaxial double ring test on flat specimens with large test surface areas prepared by Technical Committee
CEN/TC 129 "Glass in building"/WG8 "Mechanical Strength".
According to the CEN/CENELEC Internal Regulations, the national standards organisations 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.
iv © ISO 1999 – All rights reserved
DRAFT 2007
---------------------- Page: 8 ----------------------
prEN/ISO 1288-2
Introduction
A paragraph.
The introduction is an optional preliminary element used, if required, to give specific information or commentary
about the technical content of the standard, and about the reasons prompting its preparation. It shall not contain
requirements.
The introduction shall not be numbered unless there is a need to create numbered subdivisions. In this case, it
shall be numbered 0 with subclauses being numbered 0.1, 0.2, etc. Any numbered figure, table, displayed formula
or footnote shall be numbered normally beginning with 1.
© ISO 1999 – All rights reserved v
DRAFT 2007
---------------------- Page: 9 ----------------------
WORKING DRAFT prEN/ISO 1288-2
Glazing in building — Determination of the bending strength of
glass —
Part 2:
Coaxial double-ring test on flat specimens with large test surface
areas
1 Scope
This International Standard specifies a method for determining the bending strength of glass for use in buildings,
excluding the effects of the edges.
The limitations of this part of this International Standard are described in EN ISO 1288-1.
EN ISO 1288-1 should be read in conjunction with this part of this International Standard.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of EN ISO 1288. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this part of EN ISO 1288 are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
EN ISO 1288-1, Glass in building - Determination of the bending strength of glass - Part 1 : Fundamentals of
testing glass
EN 572-1, Glass in building - Basic soda lime silicate glass products - Part 1 : Definitions and general physical and
mechanical properties
ISO 48, Rubber, vulcanised or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100
IRHD)
3 Terms and definitions
For the purposes of this part of EN ISO 1288, the following terms and definitions apply.
3.1
bending stress
the tensile bending stress induced in the surface of a specimen
NOTE For testing purposes, the bending stress should be uniform over a specified part of the surface.
3.2
effective bending stress
a weighted average of the tensile bending stresses, calculated by applying a factor to take into account
non-uniformity of the stress field
3.3
bending strength
the tensile bending stress or effective bending stress which leads to breakage of the specimen
© ISO 1999 – All rights reserved 1
DRAFT 2007
---------------------- Page: 10 ----------------------
prEN/ISO 1288-2
3.4
equivalent bending strength
the apparent bending strength of patterned glass, for which the irregularities in the thickness do not allow precise
calculation of the bending stress
4 Symbols (and abbreviated terms)
2
A Effective surface area of quasi-uniform stress m
E Modulus of elasticity (Young's modulus) of the specimen. Pa
NOTE for soda lime silicate glass (see EN 572-1) a value of 70 GPa is used.
F Piston force N
F Piston force upon breakage, "breaking force" N
max
F Force transmitted by the loading ring to the specimen, "ring load" N
ring
h Thickness or average thickness of specimen m
L Side length of the square specimens m
Poisson number of specimen
µ
NOTE for soda lime silicate glass (see EN 572-1) a value of 0,23 is used.
p Gas pressure on the surface area defined by the loading ring Pa
p(F) Nominal gas pressure as a function of the piston force Pa
p (F ) Nominal gas pressure upon breakage Pa
max max
r Location co-ordinate m
Radius of loading ring m
r
1
r Radius of supporting ring m
2
r Average specimen radius (for evaluation) m
3m
Stress Pa
σ
Bending strength Pa
σ
bB
Equivalent bending strength Pa
σ
beqB
t Time s
Rate at which piston force rises N/s
∆F/∆t
F*,p*,σ* Non-dimensional quantities corresponding to F, p and σ (see equations (1) to (5))
2 © ISO 1999 – All rights reserved
DRAFT 2007
---------------------- Page: 11 ----------------------
prEN/ISO 1288-2
5 Principle of test method
The square specimen, of side length, L, and having virtually plain parallel surfaces, is placed loosely on a
supporting ring (a circular ring with a radius r ). The specimen is subjected to a load, F , by means of a loading
2 ring
ring (radius r ), which is arranged concentrically to the supporting ring. In addition, the area, A, defined by the
1
loading ring 0 < r < r is placed under gas pressure, p, which has a specific relationship with the ring load, F
1 ring
(see figure 1).
When the specimen is subjected to the ring load and the associated gas pressure, depending upon the dimensions
r , r , L, and h, a radial tensile stress field, which is sufficiently homogeneous for the test purpose, is developed on
1 2
the convexly bent surface over the area defined by the loading ring (see [1], [2], [3] of annex B). The tangential
tensile stress is equal to the radial tensile stress at the central point (r=0) of the specimen, but decreases as the
radius, r, increases.
Outside the loading ring, the radial and tangential stresses fall sharply towards the edge of the specimen, so that
the risk of breakage outside the loading ring is low. On the edge of the specimen itself, the radial stress is zero and
the tangential stress is a compressive stress, this being the case on both the concavely and the convexly bent
sides of the specimen.
...