Glass in building - Laminated glass and laminated safety glass - Determination of interlayer viscoelastic properties

This document specifies a test method for determining the mechanical viscoelastic properties of interlayer materials. The interlayers under examination are those used in the production of laminated glass and/or laminated safety glass. The interlayer viscoelastic properties are needed in order to determine the load resistance of laminated glass.
From the tensile modulus in particular conditions of temperature and load duration, an interlayer can be placed into a family that relates to a specific interlayer shear transfer coefficient.  This value can be used in the simplified calculation method described in EN 16612.
Informative Annex D explains the background to the determination of families relating to a specific interlayer shear transfer coefficient.

Glas im Bauwesen - Verbundglas und Verbundsicherheitsglas - Bestimmung der viskoelastischen Eigenschaften von Zwischenschichten

Dieses Dokument legt ein Prüfverfahren zur Bestimmung der mechanischen viskoelastischen Eigenschaften von Materialien für Zwischenschichten fest. Zu prüfen sind Zwischenschichten, die bei der Herstellung von Verbundglas und/oder Verbundsicherheitsglas verwendet werden. Die viskoelastischen Eigenschaften der Zwischenschichten werden benötigt, um den Belastungswiderstand von Verbundglas zu bestimmen.
Anhand des Zugmoduls unter bestimmten Temperaturbedingungen und der Lastdauer kann eine Zwischenschicht einer Familie zugeordnet werden, die sich auf einen bestimmten Schubübertragungskoeffizienten ω der Zwischenschicht bezieht. Dieser Wert kann für die in der EN 16612 beschriebene vereinfachte Berechnungsmethode verwendet werden.
Der Hintergrund der Bestimmung der Familien, die sich auf einen bestimmten Schubübertragungskoeffizienten der Zwischenschicht beziehen, wird im informativen Anhang D erläutert.

Verre dans la construction - Verre feuilleté et verre feuilleté de sécurité - Détermination des propriétés viscoélastiques des intercalaires

La présente Norme européenne spécifie une méthode d’essai de détermination des propriétés viscoélastiques mécaniques des matériaux d’intercalaire. Les intercalaires examinés sont ceux utilisés dans la production de verre feuilleté et/ou de verre feuilleté de sécurité. Les propriétés viscoélastiques des intercalaires sont nécessaires afin de déterminer la résistance à une charge du verre feuilleté.
À partir de son module d’élasticité en traction dans des conditions particulières de température et de durée d’application de charge, un intercalaire peut être classé dans une famille associée à un coefficient de transfert de cisaillement d’intercalaire spécifique. Cette valeur peut être utilisée dans la méthode de calcul simplifiée décrite dans l’EN 16612.
L’Annexe D (informative) explique le contexte de la détermination des familles associées à un coefficient de transfert de cisaillement d’intercalaire spécifique.

Steklo v gradbeništvu - Lepljeno steklo in lepljeno varnostno steklo - Določevanje mehanskih lastnosti vmesnih slojev

General Information

Status
Published
Publication Date
15-Oct-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
16-Oct-2019
Completion Date
16-Oct-2019

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SLOVENSKI STANDARD
SIST EN 16613:2020
01-april-2020

Steklo v gradbeništvu - Lepljeno steklo in lepljeno varnostno steklo - Določevanje

mehanskih lastnosti vmesnih slojev

Glass in building - Laminated glass and laminated safety glass - Determination of

interlayer viscoelastic properties
Glas im Bauwesen - Verbundglas und Verbundsicherheitsglas - Bestimmung der
mechanischen Eigenschaften von Zwischenschichten

Verre dans la construction - Verre feuilleté et verre feuilleté de sécurité - Détermination

des propriétés mécaniques d’un intercalaire
Ta slovenski standard je istoveten z: EN 16613:2019
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
SIST EN 16613:2020 en,fr,de

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

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SIST EN 16613:2020
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SIST EN 16613:2020
EN 16613
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 81.040.20
English Version
Glass in building - Laminated glass and laminated safety
glass - Determination of interlayer viscoelastic properties

Verre dans la construction - Verre feuilleté et verre Glas im Bauwesen - Verbundglas und

feuilleté de sécurité - Détermination des propriétés Verbundsicherheitsglas - Bestimmung der

mécaniques d'un intercalaire mechanischen Eigenschaften von Zwischenschichten
This European Standard was approved by CEN on 21 July 2019.

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 CEN-CENELEC 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 CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16613:2019 E

worldwide for CEN national Members.
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SIST EN 16613:2020
EN 16613:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

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

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

3 Terms and definitions ................................................................................................................................... 5

4 Symbols and abbreviations ......................................................................................................................... 6

5 Selection of testing procedure .................................................................................................................... 7

5.1 Isotropic interlayer materials .................................................................................................................... 7

5.2 Non-isotropic interlayer materials ........................................................................................................... 7

5.3 Interlayers which cannot be formed into small test pieces ............................................................. 8

6 Test procedure ................................................................................................................................................. 8

6.1 General ................................................................................................................................................................ 8

6.2 Test specimens ................................................................................................................................................. 8

6.3 Test method ...................................................................................................................................................... 8

6.4 Determination of E (T ,f) ........................................................................................................................... 9

L ref

7 Evaluation of ω .............................................................................................................................................. 10

7.1 Determining E (Τ,f) ..................................................................................................................................... 10

7.2 Load durations and temperature ranges............................................................................................. 11

7.3 Determining the interlayer stiffness family ....................................................................................... 11

8 Test report ...................................................................................................................................................... 14

Annex A (normative) Alternative method for non-isotropic interlayers and interlayers

which cannot be formed into small test pieces ................................................................................. 15

Annex B (normative) Preparation of test specimens ................................................................................... 17

Annex C (normative) Interlayer stiffness family............................................................................................ 18

Annex D (normative) Determination of the interlayer shear transfer coefficient from the

interlayer modulus ...................................................................................................................................... 19

Bibliography ................................................................................................................................................................. 22

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SIST EN 16613:2020
EN 16613:2019 (E)
European foreword

This document (EN 16613:2019) has been prepared by Technical Committee CEN/TC 129 “Glass in

building”, the secretariat of which is held by NBN.

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 April 2020 and conflicting national standards shall be

withdrawn at the latest by April 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
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SIST EN 16613:2020
EN 16613:2019 (E)
Introduction

The purpose of this document is to provide the viscoelastic properties of interlayer materials in order

that calculations for the load resistance of laminated glass panes can be undertaken.

In addition, this document includes a procedure for categorizing the interlayer materials into families,

which can be associated with shear transfer coefficients which are used in a simplified calculation

method according to EN 16612.
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SIST EN 16613:2020
EN 16613:2019 (E)
1 Scope

This document specifies a test method for determining the mechanical viscoelastic properties of

interlayer materials. The interlayers under examination are those used in the production of laminated

glass and/or laminated safety glass. The interlayer viscoelastic properties are needed in order to

determine the load resistance of laminated glass.

From the tensile modulus in particular conditions of temperature and load duration, an interlayer can

be placed into a family that relates to a specific interlayer shear transfer coefficient, ω. This value can be

used in the simplified calculation method described in EN 16612.

Informative Annex D explains the background to the determination of families relating to a specific

interlayer shear transfer coefficient.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1288-3, Glass in building - Determination of the bending strength of glass - Part 3: Test with specimen

supported at two points (four point bending)

EN 16612, Glass in building – Determination of the lateral load resistance of glass panes by calculation

EN ISO 6721-1, Plastics — Determination of dynamic mechanical properties — Part 1: General principles

(ISO 6721-1)

ISO 6721-4, Plastics — Determination of dynamic mechanical properties — Part 4: Tensile vibration —

Non-resonance method

ISO 6721-11, Plastics — Determination of dynamic mechanical properties — Part 11: Glass transition

temperature
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
glass transition temperature

interval of temperature in which a material changes from a rubbery state to a glassy solid state

3.2
interlayer shear transfer coefficient

coefficient between 0 and 1 describing the ability of an interlayer material to transfer shear forces

between the glass plies of a laminated glass plate when submitted to bending
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SIST EN 16613:2020
EN 16613:2019 (E)
3.3
stiffness family

group of interlayers having similar properties for the temperature range and load durations considered

3.4
vitreous polymer

polymer presenting a glass transition temperature in the range of building applications

4 Symbols and abbreviations
b Width of the test specimen
C , C Parameters in the Williams–Landel–Ferry (WLF) viscoelastic formula
1 2
e Thickness of the test specimen
E Young’s Modulus of glass
Young’s Modulus of the interlayer material
f Frequency
F Four point bend test load
G Shear modulus of the interlayer material
h Nominal thickness of ply k of a laminated glass

h Distance of the mid-plane of the glass ply k from the mid-plane of the laminated glass

m;k

h Equivalent thickness of monolithic glass for a laminated glass deflecting under load

mono
H Height of the test specimen
L Distance between centre lines of the bending rollers
L Distance between centre lines of the supporting rollers
Q Self-weight area density of four point bend test specimen
t Load duration
T Temperature
T Glass transition temperature
Reference temperature
ref
w Measured deflection of four point bend test specimen

α(Τ) Temperature transformation parameter in the WLF viscoelastic formula (known as the

'shift factor')
μ Poisson’s number of the interlayer material
ω Interlayer shear transfer coefficient
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SIST EN 16613:2020
EN 16613:2019 (E)
5 Selection of testing procedure
5.1 Isotropic interlayer materials

A practical method for testing isotropic interlayer materials is to undertake a tensile test which can be

used to determine the shear modulus using the following relationship:
(1)
G =
2()1 + µ
where

μ is the Poisson’s number of the interlayer (μ can be taken as 0,49 for an isotropic interlayer).

This leads to the approximation.
E ≈ 3G (2)

A typical test piece for testing isotropic interlayers according to ISO 6721-4 is shown in Figure 1.

Figure 1 — Dimensions of the isotropic interlayer test piece used for tensile test

Typical dimensions of the test piece are:
▪ H = 10 mm
▪ b = 5 mm

▪ e approximately 2,3 mm (equivalent to stacking 6 plies of interlayer each with nominal thickness of

0,38 mm).
5.2 Non-isotropic interlayer materials

In the case of interlayers which are not isotropic materials (an example is the acoustic tri-layer PVB),

these cannot be assessed by the method shown in 5.1.

For these interlayer materials, the relevant interlayer properties can be determined by calculation from

the results of bending tests. A method for doing this is given in Annex A.
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EN 16613:2019 (E)
5.3 Interlayers which cannot be formed into small test pieces

There are some interlayers which cannot be formed into test pieces like those described in 5.1 or which

are not stable with exposed edges in such small sizes.

For these interlayer materials, the relevant interlayer properties can be determined by calculation from

the results of bending tests. A method for doing this is given in Annex A.
6 Test procedure
6.1 General

The method uses the tests described in ISO 6721-1, ISO 6721-4, and ISO 6721-11. ISO 6721-1 gives an

overview of the principles of these tests.

It shall be ensured that the testing regime (temperature, frequency) is within the linear-viscoelastic

region of behaviour, by undertaking amplitude sweeps.
6.2 Test specimens

The test specimens shall be manufactured from samples representative of normal interlayer material

production. The test specimens shall be processed under normal laminating conditions (see Annex B).

For the purposes of the test, the thickness, e, of the test specimens should be not less than 2,2 mm thick

and not more than 4,0 mm thick. The layering and stacking of the interlayer material to achieve an

appropriate thickness shall be representative of normal production processes.

The test specimen size and tolerances on dimensions shall be determined according to the

requirements of ISO 6721-4.

Two sets of test specimens are required. One set is used for determining the glass transition

temperature, T , (see 6.3.1). The other set is used for the evaluation of the E (T ,f) curve (see 6.3.2,

g L ref
6.4).
6.3 Test method
6.3.1 Glass transition temperature, T

Initial tests shall be conducted on at least three test specimens according to ISO 6721-11 to determine

the glass transition temperature of the interlayer material. This is used to refine the temperatures

assessed in 6.3.2.

NOTE If the interlayer material is not a vitreous polymer, it may not be possible to determine a glass

transition temperature.
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EN 16613:2019 (E)
6.3.2 Determination of E (Τ, f)

A series of tests shall be conducted according to ISO 6721-4 to evaluate E (Τ,f) for a range of

frequencies, f, and a range of temperatures, Τ, sufficient to define the interlayer modulus, E .

The test temperatures shall be selected as follows.
(a) If a glass transition temperature has been determined:

• One test temperature is the glass transition temperature, T , determined in 6.3.1

• One test temperature is (T –3) °C;
• One test temperature is (T +3) °C;
• One test temperature is 20 °C;

• Other test temperatures shall be selected to give coverage of the temperature range, −20 °C to

+60 °C;
• A minimum of 15 different test temperatures shall be used.
(b) If a glass transition temperature has not been determined:
• One test temperature is 20 °C;
• One test temperature is 17 °C;
• One test temperature is 23 °C;

• Other test temperatures shall be selected to give coverage of the temperature range, −20 °C to

+60 °C;
• A minimum of 15 different test temperatures shall be used.

The frequencies to be tested at each temperature should cover the range 0,1 Hz to at least 100 Hz,

testing at least 24 frequencies evenly spread through the range.
6.4 Determination of E (T ,f)
L ref

The results obtained from 6.3.2 are used to determine a master curve for E (T ,f) for the interlayer at

L ref
the reference temperature, T , at any frequency (see Fig
...

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