Wood-based panels - Small scale indicative test methods for certain mechanical properties

This Technical Specification specifies small-scale test methods for estimating the following mechanical properties of wood-based panels:
-   indicative planar shear strength (sometimes referred to as block shear);
-   indicative panel shear strength;
-   indicative strength and modulus of elasticity in tension in the plane of the panel;
-   indicative strength in compression in the plane of the panel.
Reference should be made to EN 310 for bending properties. For plywood, EN 314 1 may also be used as an indicator of planar shear strength.
These test methods are intended for indicative purposes only and should not be used as a means of determining structural design values. They may not be suitable for all panel types. They may be used as a means of supporting quality control procedures for structural panels, if correlations with EN 789 test results can be established (CEN Technical Report in preparation).

Holzwerkstoffe - Orientierende Prüfverfahren an kleinen Prüfkörpern für einige mechanische Eigenschaften

Diese Technische Spezifikation legt orientierende Prüfverfahren an kleinen Prüfkörpern zur Abschätzung
folgender mechanischer Eigenschaften von Holzwerkstoffen fest:
.Schubfestigkeit in Plattenebene (auch als Blockscherung bezeichnet);
.Schubfestigkeit quer zur Plattenebene;
.Zugfestigkeit und Zug-Elastizitätsmodul in Plattenebene;
.Druckfestigkeit in Plattenebene.
Zur Bestimmung der Biegeeigenschaften gilt EN 310. Bei Sperrholz kann auch EN 314-1 als Hinweis auf die
Schubfestigkeit in Plattenebene dienen.
Diese Prüfverfahren dienen nur zur Orientierung und sollten nicht zur Bestimmung von Werten zur Berech-nung
und Bemessung von Bauwerken verwendet werden. Bei einigen Plattentypen können sie nicht geeignet
sein. Sie können als Hilfsmittel bei der Qualitätskontrolle von Platten zur tragenden Verwendung dienen, wenn
Korrelationen mit EN 789 nachgewiesen werden können (ein CEN Technical Report hierzu ist in 4

Panneaux à base de bois - Méthodes d'essais indicatives sur éprouvettes de petites dimensions pour certaines propriétés mécaniques

La présente Spécification technique définit les méthodes d'essais sur petites éprouvettes permettant d'estimer
les caractéristiques mécaniques des panneaux à base de bois suivantes :
.résistance indicative du cisaillement roulant (parfois appelé cisaillement dans le plan) ;
.résistance indicative du cisaillement de voile ;
.résistance et module d'élasticité en traction indicatifs, dans le plan du panneau ;
.résistance indicative en compression dans le plan du panneau.
Pour les caractéristiques en flexion, il est recommandé de se référer à EN 310. En ce qui concerne le
contreplaqué, on peut également utiliser EN 314-1, comme indicateur de la résistance au cisaillement roulant.
Ces méthodes d'essais sont prévues dans des buts uniquement indicatifs et ne devraient pas être utilisées
comme moyens de détermination de valeurs pour la conception en structure. Elles peuvent ne pas être
adaptées pour tous les types de panneaux. Si des corrélations avec les résultats d'essai selon EN 789
peuvent être établies, elles peuvent être utilisées comme "supports" dans le cadre des procédures de contrôle
qualité pour les panneaux à usage structurel (Rapport technique en préparation).

Lesne plošče – Indikativne preskusne metode na majhnih preskušancih za nekatere mehanske lastnosti

General Information

Status
Published
Publication Date
24-May-2005
Current Stage
9093 - Decision to confirm - Review Enquiry
Due Date
21-Jan-2009
Completion Date
21-Jan-2009

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SLOVENSKI STANDARD
SIST-TS CEN/TS 14966:2006
01-december-2006
/HVQHSORãþH±,QGLNDWLYQHSUHVNXVQHPHWRGHQDPDMKQLKSUHVNXãDQFLK]D
QHNDWHUHPHKDQVNHODVWQRVWL
Wood-based panels - Small scale indicative test methods for certain mechanical
properties
Holzwerkstoffe - Orientierende Prüfverfahren an kleinen Prüfkörpern für einige
mechanische Eigenschaften

Panneaux a base de bois - Méthodes d'essais indicatives sur éprouvettes de petites

dimensions pour certaines propriétés mécaniques
Ta slovenski standard je istoveten z: CEN/TS 14966:2005
ICS:
79.060.01 /HVQHSORãþHQDVSORãQR Wood-based panels in
general
SIST-TS CEN/TS 14966:2006 en

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

---------------------- Page: 1 ----------------------
TECHNICAL SPECIFICATION
CEN/TS 14966
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
May 2005
ICS 79.060.01
English version
Wood-based panels - Small scale indicative test methods for
certain mechanical properties

Panneaux à base de bois - Méthodes d'essais indicatives Holzwerkstoffe - Orientierende Prüfverfahren an kleinen

sur éprouvettes de petites dimensions pour certaines Prüfkörpern für einige mechanische Eigenschaften

propriétés mécaniques

This Technical Specification (CEN/TS) was approved by CEN on 25 October 2004 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their

comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available

promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)

until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 14966:2005: E

worldwide for CEN national Members.
---------------------- Page: 2 ----------------------
CEN/TS 14966:2005 (E)
Contents
Page

Foreword ..........................................................................................................................................................3

1 Scope ...................................................................................................................................................4

2 Normative references .........................................................................................................................4

3 Terms and definitions.........................................................................................................................4

4 Indicative planar shear strength ........................................................................................................4

4.1 Principle...............................................................................................................................................4

4.2 Apparatus ............................................................................................................................................5

4.3 Test pieces ..........................................................................................................................................5

4.4 Procedure ............................................................................................................................................6

4.5 Expression of results..........................................................................................................................6

5 Indicative panel shear strength .........................................................................................................6

5.1 Principle...............................................................................................................................................6

5.2 Apparatus ............................................................................................................................................7

5.3 Test pieces ..........................................................................................................................................7

5.4 Procedure ............................................................................................................................................8

5.5 Expression of results..........................................................................................................................9

6 Indicative modulus of elasticity in tension and tension strength ...................................................9

6.1 Principle...............................................................................................................................................9

6.2 Apparatus ............................................................................................................................................9

6.3 Test pieces ..........................................................................................................................................9

6.4 Procedure ..........................................................................................................................................10

6.5 Expression of results........................................................................................................................11

7 Indicative compression strength .....................................................................................................11

7.1 Principle.............................................................................................................................................11

7.2 Apparatus ..........................................................................................................................................11

7.3 Test pieces ........................................................................................................................................12

7.4 Procedure ..........................................................................................................................................12

7.5 Expression of results........................................................................................................................12

8 Test report .........................................................................................................................................13

Bibliography...................................................................................................................................................14

---------------------- Page: 3 ----------------------
CEN/TS 14966:2005 (E)
Foreword

This document (CEN/TS 14966:2005) has been prepared by Technical Committee CEN/TC 112 “Wood-based

panels”, the secretariat of which is held by DIN.

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

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to announce this Technical Specification: Austria, Belgium, Cyprus, Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland

and the United Kingdom.
---------------------- Page: 4 ----------------------
CEN/TS 14966:2005 (E)
1 Scope

This Technical Specification specifies small-scale test methods for estimating the following mechanical

properties of wood-based panels:
 indicative planar shear strength (sometimes referred to as block shear);
 indicative panel shear strength;

 indicative strength and modulus of elasticity in tension in the plane of the panel;

 indicative strength in compression in the plane of the panel.

Reference should be made to EN 310 for bending properties. For plywood, EN 314-1 may also be used as an

indicator of planar shear strength.

These test methods are intended for indicative purposes only and should not be used as a means of

determining structural design values. They may not be suitable for all panel types. They may be used as a

means of supporting quality control procedures for structural panels, if correlations with EN 789 test results

can be established (CEN Technical Report in preparation).
2 Normative references

The following referenced documents are indispensable for the application 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 325, Wood-based panels — Determination of dimensions of test pieces.

EN 326-1, Wood-based panels — Sampling, cutting and inspection — Part 1: Sampling and cutting of test

pieces and expression of test results.
3 Terms and definitions
For the purposes of this document, the following terms and definition apply.
3.1
indicative test

test intended to give an estimate of a particular property for guidance purposes only. It may be used as a tool

for the estimation of additional properties where a reliable correlation can be demonstrated

4 Indicative planar shear strength
4.1 Principle

The shear strength parallel to the surface of the test piece is determined by applying a uniform compressive

force until rupture occurs. The compression load required to obtain failure is measured.

NOTE This test procedure is not appropriate to plywood made from mixed species.
---------------------- Page: 5 ----------------------
CEN/TS 14966:2005 (E)
4.2 Apparatus
4.2.1 Measuring instruments, as specified in EN 325.

Shear test apparatus for applying a shear load through the central plane of the test piece, as shown in

4.2.2

Figure 1. The shearing apparatus provides support to one half of the lower edge of the test pieces, whilst

applying a load to the opposite half of the upper edge of the test piece. The edges of the support and loading

blocks shall form a vertical plane passing through the centre of the test piece.

4.2.3 Testing machine, capable of applying a compressive force parallel to the surface of the test piece, and

measuring this force to an accuracy of 1 % of the maximum applied load.
Key
1 spherical seated
2 test piece
Figure 1 — Arrangement of the shear test apparatus
4.3 Test pieces
4.3.1 Sampling and cutting

Sampling and cutting of the test pieces shall be carried out according to EN 326-1.

A minimum of 8 test pieces shall be taken from each board to be tested.
4.3.2 Dimensions

The test piece shall be (50 ± 0,1) mm × (50 ± 0,1) mm with a thickness equal to the thickness of the board. If

the thickness of the panel is ≥ 15 mm, the thickness of the test piece shall be a single panel thickness. For

panels with a thickness < 15 mm, a sufficient odd number of specimens shall be laminated by gluing, with a

suitable glue type, to give a test piece with a minimum thickness of 15 mm.
---------------------- Page: 6 ----------------------
CEN/TS 14966:2005 (E)
4.3.3 Conditioning

The test pieces shall be conditioned to constant mass in an atmosphere with a relative humidity of (65 ± 5) %

and a temperature of (20 ± 1) °C. Constant mass is considered to be reached when the results of two

successive weighing operations, carried out at an interval of 24 h, do not differ more than 0,1 % of the mass of

the test piece.

In some cases, for instance in a cyclic test in humid conditions or in an immersion-in-water or boil test,

alternative conditioning procedures may be specified. In this case the appropriate standard shall be consulted

and followed. In the case of laminated test pieces, the lamination shall be carried out after the cyclic

conditioning.
4.3.4 Determination of dimensions

After conditioning, measure the length and width of each test piece to an accuracy of ± 0,1 mm according to

EN 325.
4.4 Procedure

The shear test apparatus shall be mounted in a compression testing machine. The test piece shall be centrally

positioned in the apparatus.

The load shall be applied at a constant rate of cross-head movement throughout the test. The rate of loading

shall be adjusted so that the maximum load is reached within (60 ± 30) s. The maximum load for each test

piece shall be recorded.
4.5 Expression of results

The shear strength parallel to the surface (indicative planar shear strength) f (N/mm ) of the test piece shall

be calculated from the following equation to three significant figures:
max
f =
where
F is the maximum load, in Newtons;
max
...

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