EN 17117-2:2021

SLOVENSKI STANDARD
01-oktober-2021
Gumirane ali plastificirane tekstilije - Mehanske preskusne metode v dvoosnih
napetostnih stanjih - 2. del: Določanje vrednosti kompenzacije vzorca
Rubber- or plastics-coated fabrics - Mechanical test methods under biaxial stress states -
Part 2: Determination of the pattern compensation values
Mit Kautschuk oder Kunststoff beschichtete Textilien - Mechanische Prüfverfahren unter
biaxialer Spannung - Teil 2: Bestimmung der Kompensationswerte
Supports textiles revêtus de caoutchouc - Méthodes d'essais mécaniques sous
contraintes biaxiales - Partie 2 : Détermination des valeurs de compensation des
modèles
Ta slovenski standard je istoveten z: EN 17117-2:2021
ICS:
59.080.40 Površinsko prevlečene Coated fabrics
tekstilije
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17117-2
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 59.080.40
English Version
Rubber- or plastics-coated fabrics - Mechanical test
methods under biaxial stress states - Part 2: Determination
of the pattern compensation values
Supports textiles revêtus de caoutchouc ou de Mit Kautschuk oder Kunststoff beschichtete Textilien -
plastique - Méthodes d'essais mécaniques sous Mechanische Prüfverfahren unter biaxialen
contraintes biaxiales - Partie 2: Détermination des Spannungszuständen - Teil 2: Bestimmung der
valeurs de compensation du patronnage Kompensationswerte
This European Standard was approved by CEN on 21 June 2021.

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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17117-2:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 8
5 Apparatus . 8
5.1 Biaxial test equipment . 8
5.2 Measurement of load . 8
5.3 Measurement of strain . 8
6 Sampling and preparation of test specimens . 8
6.1 Bulk sample (number of pieces from a shipment or lot) . 8
6.2 Number of laboratory samples . 8
6.3 Specimen geometry and preparation . 8
6.3.1 General . 8
6.3.2 Contact strain measurement . 8
6.3.3 Non-contact strain measurement. 8
7 Atmosphere for conditioning and testing . 8
8 Test procedure . 9
8.1 Mounting of the specimen . 9
8.2 Loading and selection of strain values . 9
8.3 Testing . 12
8.4 Recording . 12
9 Representation of test results and calculation of compensation values . 12
9.1 Representation. 12
9.2 Determination of compensation values . 13
9.3 Decompensation . 13
9.4 Comparable measures of extensibility . 13
10 Test report . 13
Annex A (informative) Load profiles and selected strain values (examples) . 14
A.1 Generality . 14
A.2 Load profiles – example I . 14
A.3 Load profiles – example II . 15
A.4 Load profiles – example III. 18
Annex B (informative) Example evaluation of project specific compensation values . 19
Annex C (normative) Load profile for comparative extensibility measures of coated fabrics . 22
Bibliography . 23

European foreword
This document (EN 17117-2:2021) has been prepared by Technical Committee CEN/TC 248 “Textiles
and textile products”, the secretariat of which is held by BSI.
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 2022, and conflicting national standards shall
be withdrawn at the latest by January 2022.
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
EN 17117 consists of the following parts, under the general title Rubber- or plastics-coated fabrics —
Mechanical test methods under biaxial stress states:
— Part 1: Tensile stiffness properties
— Part 2: Determination of the pattern compensation values
An additional part related to shear stiffness properties will be proposed after the publication of the
previous parts.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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.
Introduction
Compensation is the process of reducing the size of cutting patterns with the objective to introduce and
maintain the desired range of prestress specified in the structural design using coated fabrics such as
architectural tensioned envelopes. Elastic strain correspondent to the prestress and irreversible strain
of the coated fabrics induced by tensioning during installation and potential load incidents over the
lifetime of an architectural tensioned envelope, should be compensated to achieve the objective. Different
compensation values may be applied to different parts of the same architectural tensioned envelope.
Decompensation may also be applied if required.
1 Scope
This document describes methods for the determination of compensation values for orthotropic coated
fabrics (different properties along ideally perpendicular directions, such as the weft and warp yarns for
woven based coated fabrics, or along the courses and wales of knitted based coated fabrics) for
determining cutting patterns.
NOTE The final interpretation and the determination of the compensation values remains the responsibility of
the project engineer.
Annex C describes a method to determine comparable measures of extensibility along ideally
perpendicular directions of coated fabrics. The comparable measures of extensibility can be used by
design engineers to assess the extensibility of a coated fabric by comparison with other coated fabrics. In
this way, they can help to interpret results of compensation tests. Moreover, they can be used by material
suppliers to measure the consistency of extensibility along perpendicular directions of a coated fabric
from batch to batch.
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 17117-1, Rubber or plastics-coated fabrics - Mechanical test methods under biaxial stress states - Part
1: Tensile stiffness properties
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:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
biaxial
measurement or application along two axes simultaneously
[SOURCE: EN 17117-1:2018, 3.1]
3.2
compensation
reduction in size of a cutting pattern, so that during installation the panel elongates to achieve an initial
nominal prestress
3.3
compensation value
amount by which the dimensions of the pattern geometry is reduced by compensation
Note 1 to entry: The compensation value is expressed as a percentage of length in the direction to be
compensated.
3.4
cutting pattern
two-dimensional geometry developed from a pattern to be cut out of the individual piece of a coated
fabric
3.5
decompensation
partial or complete reduction of compensation
Note 1 to entry: Decompensation may be applied to ease the installation process, typically in the vicinity of
boundaries.
Note 2 to entry: Typical application of compensation and decompensation to a piece of a coated fabric is depicted
in Figure 1.
Key
1 final geometry when stressed with nominal prestress
2 geometry compensated, unstressed
3 geometry decompensated, unstressed
4 half of the pattern compensation measure in warp (wale, respectively)
5 half of the pattern compensation measure in fill (course, respectively)
Figure 1 — Typical application of compensation and decompensation to a piece of a coated
fabric
3.7
overstressing
stressing beyond the nominal prestress level during the installation of a panel
3.8
panel
final three-dimensional assembly of pieces of a coated fabric, cut according to the cutting pattern, ready
to be installed on site
Note 1 to entry: An architectural tensioned envelope may be made of more than one panel.
3.9
piece of a coated fabric
two-dimensional piece cut from a roll of coated fabric
3.10
nominal prestress
input data of prestress, prescribed during the form finding and structural analysis, and part of the
structural design
3.11
pattern
seam layout based subdivision of a three-dimensional surface into a piece of a coated fabric
3.12
seam layout
definition of location and direction of seams over the surface of an architectural tensioned envelope
3.13
W1,5
load applied in the warp (respectively wale) direction with a magnitude of 1,5 % of the ultimate tensile
strength (UTS) in the warp (respectively wale) direction
3.14
F1,5
load applied in the fill (respectively course) direction with a magnitude of 1,5 % of the ultimate tensile
strength (UTS) in the fill (respectively course) direction
3.15
W10
load applied in the warp (respectively wale) direction with a magnitude of 10 % of the ultimate tensile
strength (UTS) in the warp (respectively wale) direction
3.16
F10
load applied in the fill (respectively course) direction with a magnitude of 10 % of the ultimate tensile
strength (UTS) in the fill (respectively course) direction
3.17
MIN1,5
minimum of W1,5 and F1,5
3.18
MIN10
minimum of W10 and F10
4 Principle
Strains measured during the biaxial loading in warp and fill (respectively wale and course) directions of
the coated fabric are used to derive the compensation values.
5 Apparatus
5.1 Biaxial test equipment
Shall be according to EN 17117-1:2018, 5.1.
5.2 Measurement of load
Shall be according to EN 17117-1:2018, 5.2.
5.3 Measurement of strain
Shall be according to EN 17117-1:2018, 5.3.
6 Sampling and preparation of test specimens
6.1 Bulk sample (number of pieces from a shipment or lot)
Shall be according to EN 17117-1:2018, 6.1.
6.2 Number of laboratory samples
Shall be according to EN 17117-1:2018, 6.2.
6.3 Specimen geometry and preparation
6.3.1 General
Shall be according to EN 17117-1:2018, 6.3.1.
6.3.2 Contact strain measurement
Shall be according to EN 17117-1:2018, 6.3.2.
6.3.3 Non-contact strain measurement
Shall be according to EN 17117-1:2018, 6.3.3.
7 Atmosphere for conditioning and testing
Shall be according to EN 17117-1:2018, Clause 7.
8 Test procedure
8.1 Mounting of the specimen
Shall be according to EN 17117-1:2018, 8.1.
8.2 Loading and selection of strain values
In order to derive project specific compensation values from selected strain values, project specific load
profiles should be individually specified. The specimen is loaded by forces in the warp and fill
(respectively wale and course) directions with prescribed magnitudes and ratios.
Example of project specific load profiles are illustrated in Annex B.
Load ratios are used to define a load cycle with start, middle and end values.
The specification of the load profile should include consideration of:
— design nominal prestress;
— design biaxial stresses arising from characteristic external loads, for example wind, snow. Design
biaxial stresses should be representative (for example an average value) for the area over which the
compensation value is to be applied;
— type of external loads, for example wind, snow;
— design biaxial stress ratios;
— duration of design biaxial stresses;
— probability of design biaxial stresses;
— spatial representation of design biaxial stresses;
— area over which the compensation value is to be applied;
— overstressing anticipated during installation;
— installation process, for example order of prestressing of the yarn directions during installation.
Typically, two dominant load cases can be derived from the structural analysis: one with predominant
warp stress and one with predominant fill stress. The respective stresses in warp and fill direction
together with the corresponding stresses in the perpendicular direction should be used to specify the
load profile. The load profile should consist of the steps given in Table 1. In some cases, for example
pneumatic structures or plane frames, only one load case may exist. In these cases, steps 4 and 5 can be
neglected.
Table 1 — Steps for the individual specification of the load profile
Step Simulation of Remarks
o
N
Prestress/installation Nominal prestress held constant over a
specified period of time. Overstressing may be
considered. Prestress may be applied in
several cycles prior to holding it constant.
Load case with predominant warp stress Long-term nature of a load case may be
2 together with corresponding fill stress, considered by holding maximum stress
repeated several times constant over a specified period of time
3 Period of nominal prestress held constant -
Load case with predominant fill stress Long-term nature of a load case may be
4 together with corresponding warp stress, considered by holding maximum stress
repeated several times constant over a specified period of time
5 Period of nominal prestress held constant -
6 Repetition of steps 1 to 5 may be considered -
Example loading options in step 1 “Prestress/installation” are illustrated in Figure 2: Loading and
nominal prestress held constant (a), simulation of overstressing prior to prestress held constant (b),
prestress cycling prior to prestress h
...