FprEN 16613

SLOVENSKI STANDARD
01-april-2024
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
viskoelastischen Eigenschaften von Zwischenschichten
Verre dans la construction - Verre feuilleté et verre feuilleté de sécurité - Détermination
des propriétés viscoélastiques des intercalaires
Ta slovenski standard je istoveten z: prEN 16613
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 16613
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2024
ICS 81.040.20 Will supersede EN 16613:2019
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
viscoélastiques des intercalaires viskoelastischen Eigenschaften von Zwischenschichten
This draft European Standard is submitted to CEN members for 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-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, Türkiye 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

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16613:2024 E
worldwide for CEN national Members.

prEN 16613:2024 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviations . 7
5 Test procedure . 10
5.1 General. 10
5.2 Test specimens . 11
5.3 Test method . 11
5.3.1 Glass transition temperature T (step 1) . 11
g
5.3.2 Determination of the temperature and time dependent shear modulus G (T, t) . 12
int
6 Evaluation of the shear transfer characteristics . 14
6.1 Determination of the temperature and time dependent shear modulus G (T,t) . 14
int
6.2 Load durations and temperature ranges . 15
7 Test report . 15
Annex A (normative) Bending creep method for the determination of the interlayer
properties . 17
Annex B (normative) Preparation of test specimens . 26
Annex C (informative) Time-temperature-superposition principle and Prony series . 27
Annex D (informative) Interlayer mechanical properties at different frequencies for a
chosen temperature . 30
Annex E (informative) Determination of the displacement of the point of contact between
the support rollers and the plate . 31
Bibliography . 33

prEN 16613:2024 (E)
European foreword
This document (prEN 16613:2024) has been prepared by Technical Committee CEN/TC 129 “Glass in
building”, the secretariat of which is held by NBN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 16613:2019.
prEN 16613:2024 includes the following significant technical changes with respect to EN 16613:2019:
a) The test procedure focuses on a parallel-plate oscillation rather than tensile vibration.
b) A more detailed description of the test procedure is provided comprising four subsequent steps.
c) Annex A has been reviewed and is used for non-isotropic and multilayer interlayer materials as well
as step four in the main test procedure. It provides the methods to calculate the effective thickness,
shear transfer coefficient 𝜔𝜔, the coupling factor 𝜂𝜂 and the interlayer shear modulus G .
int
d) Annex C details the procedure to obtain the master curve and the Prony parameters.
e) The new Annex D will help determine mechanical properties used for calculation of noise reduction.
f) Annex E provides guidance for a precise geometrical assessment of a deflected specimen.
prEN 16613:2024 (E)
Introduction
The purpose of this document is to provide viscoelastic properties of interlayer materials for structural
design of laminated glass.
In addition, it provides a method to calculate interlayer mechanical properties at different frequencies
that can be used for calculation of sound reduction indices.
prEN 16613:2024 (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 or laminated safety glass. The shear characteristics of interlayers are needed to design laminated
glass in accordance with EN 16612:2019 and CEN/TS 19100 series.
Parameters of the Prony series, widely used in numerical simulation, can be derived from the
measurements in Annex C.
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 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 6721-6, Plastics — Determination of dynamic mechanical properties — Part 6: Shear vibration — Non-
resonance method
ISO 6721-7, Plastics — Determination of dynamic mechanical properties — Part 7: Torsional vibration —
Non-resonance method
ISO 6721-10, Plastics — Determination of dynamic mechanical properties — Part 10: Complex shear
viscosity using a parallel-plate oscillatory rheometer
ISO 6721-11, Plastics — Determination of dynamic mechanical properties — Part 11: Glass transition
temperature
EN 16612:2019, Glass in building - Determination of the lateral load resistance of glass panes by calculation
ISO 18437-6, Mechanical vibration and shock — Characterization of the dynamic mechanical properties of
visco-elastic materials — Part 6: Time-temperature superposition
CEN/TS 19100-2:2021, Design of glass structures - Part 2: Design of out-of-plane loaded glass components
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 6721-1:2019 and
ISO 18437-6 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
prEN 16613:2024 (E)
3.1
glass transition temperature
T
g
interval of temperature in which a material changes from a rubbery state to a solid state or vice versa
3.2
interlayer shear transfer coefficient
ω
coefficient between 0 and 1 describing the ability of an interlayer material to transfer shear forces
between the glass plies of a laminated glass pane when submitted to bending
3.3
vitreous polymer
polymer presenting a glass transition temperature Tg in the range of building applications
3.4
relaxation modulus
G
int
ratio of the time-dependent stress to an imposed constant strain
3.5
complex modulus
ratio of dynamic stress and dynamic strain of a viscoelastic material that is subjected to a sinusoidal
vibration
3.6
storage modulus
real part of the complex modulus
3.7
loss modulus
imaginary part of the complex modulus
3.8
phase angle
phase difference between the dynamic stress and the dynamic strain in a viscoelastic material subjected
to a sinusoidal oscillation (δ)
Note 1 to entry: See Figure 2.
Note 2 to entry: The phase angle is expressed in radians (rad).
Note 3 to entry: In a dynamic experiment, it is the angle between the complex modulus G* and the projection of its
elastic part, the storage modulus part G’.
3.9
loss factor
tangent of the phase angle, also expressed as the ratio of the dynamic loss modulus G” over the dynamic
storage modulus G’
Note 1 to entry: See Figure 1.
Note 2 to entry: The loss factor is expressed as a dimensionless number.
prEN 16613:2024 (E)
3.10
shift factor
value (positive or negative) of the horizontal displacement of each DMA curve along the frequency axis
to form the master curve
3.11
master curve
curve obtained by shifting isothermal DMA curves measured at different frequencies and a selected
reference temperature
3.12
Time-Temperature-Superposition
principle which enables prediction of material behaviour outside the testable range
3.13
Prony series
formula that allows calculation of the shear modulus based on Prony parameters
3.14
Prony parameters
parameters to evaluate the shear relaxation modulus from the Prony series, including the normalized
moduli g , relaxation times τ and the initial shear modulus G
i i 0
4 Symbols and abbreviations
a(Τ) Temperature dependent, horizontal shift factor in the time-
temperature superposition principle
b Width of the test specimen
b Average width of the plate
ave
l Corrected distance between supporting rollers in case of bent
cor
glass plate
l Reduction of the span per each supporting roller
red
C , C Empirical constants of the WLF-TTS visco-elastic formula
1 2
d Distance of the mid-plane of the glass plies from the mid-plane of
the laminated glass composed of two plies of the same thickness
d Distance of the mid-plane of the glass ply 1 from the mid-plane of
the laminated glass
d Distance of the mid-plane of the glass ply 2 from the mid-plane of
the laminated glass
d Distance of the mid-plane of the glass ply 3 from the mid-plane of
the laminated glass
D Flexural stiffness at “no shear” condition
abs
D Flexural limit at “full shear” condition
full
D Flexural stiffness of the glass ply i
i
DMTA Dynamic Mechanical Thermal Analysis (-TS: temperature sweep, -
AS: amplitude sweep, -TFS: temperature-frequency sweep)
prEN 16613:2024 (E)
DSC Differential Scanning Calorimetry
e Deflection under self weight
dl
e Deflection under applied load
f
EET Enhanced Effective Thickness method
E Young’s modulus of glass
E Activation energy
a
E Young's modulus of the interlayer materi
...