SIST EN 14869-2:2004
(Main)Structural adhesives - Determination of shear behaviour of structural bonds - Part 2: Thick adherends shear test (ISO 11003-2:2001, modified)
Structural adhesives - Determination of shear behaviour of structural bonds - Part 2: Thick adherends shear test (ISO 11003-2:2001, modified)
This part of EN 14869 specifies a test method for determining the shear behaviour of an adhesive in a single lap joint bonded assembly when subjected to a tensile force.
The test is performed on specimens consisting of thick, rigid adherends, with a short length of overlap, in order to obtain the most uniform distribution of shear stresses possible and to minimize other stress states which initiate failure.
This test method may be used to determine:
-shear-stress against shear-strain curve to failure of the adhesive;
-shear modulus of the adhesive;
-other adhesive properties that can be derived from the stress/strain curve such as the maximum shear stress and shear strain;
-effect of temperature, environment, test speed, etc., on these properties.
Strukturklebstoffe - Bestimmung des Scherverhaltens struktureller Klebungen - Teil 2: Scherprüfung für dicke Fügeteile (ISO 11003-2:2001, modifiziert)
Dieser Teil der ISO 11003 legt ein Prüfverfahren zur Bestimmung des Scherver- haltens eines Klebstoffe in einer einfach überlappten Klebverbindung fest, die einer Zugkraft unterworfen wird. Um eine möglichst gleichmässige Schubspan- nungsverteilung zu erhalten und unerwünschte Spannungen zu minimieren, wird diePrüfung mit Proben durchgeführt, die aus dicken, starren Fügeteilen mit kur- zer Überlappungslänge bestehen.
Adhésifs structuraux - Détermination du comportement en cisaillement - Partie 2: Essai de cisaillement par traction sur éprouvette a simple recouvrement avec supports épais (ISO 11003-2:2001, modifié)
La présente partie de l'EN 14869 spécifie une méthode d'essai pour la détermination des caractéristiques en cisaillement d'un adhésif dans un assemblage collé a recouvrement simple lorsqu'il est soumis a un effort de traction.
L'essai est effectué sur des éprouvettes constituées de supports épais et rigides, la longueur de recouvrement étant faible, afin d'obtenir une répartition des contraintes de cisaillement la plus uniforme possible et de limiter d'autres états de contraintes qui initient la rupture.
Cette méthode d'essai peut etre utilisée pour déterminer :
- les courbes de résistance en cisaillement en fonction de la déformation jusqu'a la rupture de l'adhésif ;
- le module d'élasticité en cisaillement de l'adhésif ;
- toutes autres caractéristiques susceptibles d'etre dérivées de la courbe contrainte/déformation, telles la contrainte de cisaillement ainsi que la résistance au cisaillement maximales ;
l'effet de la température, de l'environnement, de la vitesse d'essai, etc., sur ces caractéristiques.
Konstrukcijska lepila - Določanje strižnih lastnosti konstrukcijskih spojev – 2. del: Strižno preskušanje debelih lepljencev (ISO 11003-2:2001, spremenjen)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.MHQStrukturklebstoffe - Bestimmung des Scherverhaltens struktureller Klebungen - Teil 2: Scherprüfung für dicke Fügeteile (ISO 11003-2:2001, modifiziert)Adhésifs structuraux - Détermination du comportement en cisaillement - Partie 2: Essai de cisaillement par traction sur éprouvette a simple recouvrement avec supports épais (ISO 11003-2:2001, modifié)Structural adhesives - Determination of shear behaviour of structural bonds - Part 2: Thick adherends shear test (ISO 11003-2:2001, modified)83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 14869-2:2004SIST EN 14869-2:2004en,fr,de01-oktober-2004SIST EN 14869-2:2004SLOVENSKI
STANDARD
SIST EN 14869-2:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14869-2July 2004ICS 83.180English versionStructural adhesives - Determination of shear behaviour ofstructural bonds - Part 2: Thick adherends shear test (ISO11003-2:2001, modified)Adhésifs structuraux - Détermination du comportement encisaillement d'adhésifs structuraux - Partie 2: Méthoded'essai en traction sur éprouvette épaisse (ISO 11003-2:2001, modifiée)Strukturklebstoffe - Bestimmung des Scherverhaltens vonstrukturellen Klebungen - Teil 2: Zugprüfverfahren für dickeFügeteile (ISO 11003-2:2001, modifiziert)This European Standard was approved by CEN on 16 April 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14869-2:2004: ESIST EN 14869-2:2004
EN 14869-2:2004 (E) 2 Contents Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Principle.4 5 Safety clause.5 6 Apparatus.6 7 Specimen.6 7.1 Specimen dimensions and configurations.6 7.2 Adherends.7 7.3 Preparation of surfaces before bonding.7 8 Test specimen.9 8.1 Preparation.9 8.1.1 Specimens with flat-ended adherends.9 8.1.2 Specimens with stepped adherends.9 8.2 Number of specimens.10 9 Procedure.12 10 Calculations.15 10.1 Symbols used.15 10.2 Average shear stress ττττ in the adhesive.15 10.3 Shear strain γγγγ in the adhesive.16 10.4 Stress strain curve.17 10.5 Shear modulus of the adhesive.18 11 Precision.18 12 Test report.18 Annex A (informative)
Suitable extensometer design.20
SIST EN 14869-2:2004
EN 14869-2:2004 (E) 3 Foreword The text of the International Standard from Technical Committee ISO/TC 61 “Plastics” of the International Organization for Standardization (ISO) has been taken over as a European Standard (EN 14869-2:2004) by Technical Committee CEN/TC 193, "Adhesives", the secretariat of which is held by AENOR. 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 2005, and conflicting national standards shall be withdrawn at the latest by January 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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. Endorsement notice The text of ISO 11003-2:2001 has been approved by CEN as a European Standard with agreed common modifications as given below: The title has been modified The scope has been modified Clause 2 "Normative references" has been updated Clause 3 "Terms and definitions" is new Clause 5 "Safety clause" is new Subclauses 7.1 Specimen dimensions and configurations, 10.3 Shear strain γ in the adhesive, Note under 10.4 Stress/strain curve and clause 12 Test report have been changed SIST EN 14869-2:2004
EN 14869-2:2004 (E) 4
1 Scope This part of EN 14869 specifies a test method for determining the shear behaviour of an adhesive in a single lap joint bonded assembly when subjected to a tensile force. The test is performed on specimens consisting of thick, rigid adherends, with a short length of overlap, in order to obtain the most uniform distribution of shear stresses possible and to minimize other stress states which initiate failure. This test method may be used to determine: shear-stress against shear-strain curve to failure of the adhesive; shear modulus of the adhesive; other adhesive properties that can be derived from the stress/strain curve such as the maximum shear stress and shear strain; effect of temperature, environment, test speed, etc., on these properties. 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 923:1998, Adhesives – Terms and definitions. EN 13887, Structural adhesives – Guidelines for surface preparation of metals and plastics prior to adhesive bonding. EN ISO 291, Plastics — Standard atmospheres for conditioning and testing. EN ISO 10365, Adhesives - Designation of main failure patterns (ISO 10365:1992). ISO 683-11, Heat-treatable steels, alloy steels and free-cutting steels — Part 11: Wrought case-hardening steels. ISO 1052, Steels for general engineering purposes. ISO 4995, Hot-rolled steel sheet of structural quality.
3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:1998 apply. 4 Principle An adhesively bonded test specimen (see Figure 1) is subjected to a tensile force so that the adhesive is stressed in shear. SIST EN 14869-2:2004
EN 14869-2:2004 (E) 5 The relative displacement of the adherends is measured using a purpose-built transducer located in the central region of the specimen. Force and displacement are measured from the start of application of the load until fracture of the specimen. The shear stresses and strains are then calculated from the bond dimensions.
Dimensions in millimetres
Key 1 Adhesive bond Figure 1 — Specimen dimensions and configuration: a) Bonded adherends; b) Machined adherends 5 Safety clause The users of this document shall be familiar with normal laboratory practice. This document does not purport to address all safety problems, if any, associated with its use. It is the responsibility of the user to establish safety and health practices and to ensure compliance with any European and national regulatory conditions. SIST EN 14869-2:2004
EN 14869-2:2004 (E) 6 6 Apparatus 6.1 Tensile-testing machine, capable of producing fracture in the specimen at a tensile force between 10 % and 80 % of the full-scale range of the force transducer. 6.2 Device for introducing a force into the specimen, so that negligible torque develops when force is applied to the specimen. For this purpose, the simple universal-joint design shown in Figure 2 is satisfactory. 6.3 Force transducer, capable of measuring the force in the specimen with an accuracy of 1% of the force at a shear strain of 0,01. 6.4 One or two extensometers (see note 2), for measuring the shear displacement between points of known separation on each adherend in the central region of the bond (see Figure 3 and Annex A). The points of contact with the adherends shall be within a distance of 2 mm from the bonded faces. The device(s) shall be capable of measuring the shear displacement to an accuracy of 1 µm. NOTE1 During loading, each adherend will bend slightly, leading to a small rotation of the central (bonded) region of the test specimen. In order to achieve high accuracy in displacement measurements, it is necessary for the extensometer(s) to rotate with the specimen. This has been achieved in the design shown in Figure 3 by double-pin contact with one of the adherends. NOTE 2 The use of two extensometers on opposing faces of the specimen is recommended to minimize, by averaging the extensometer readings, any contribution to measurements from a twisting moment applied to the specimen. The use of two extensometers will also serve to indicate any malfunctioning of one of the extensometers as revealed by significantly different readings from the two devices. 6.5 Data-logging equipment, to continuously record the relative displacement of the adherends and the applied load, from the start of application of the load until the specimen breaks. 6.6 Micrometer, having an accuracy of better than 0,002 mm, to measure the dimensions of the adherends. 6.7 Optical microscope, having an accuracy of better than 0,002 mm, to measure the thickness of the adhesive bond when the specimen configuration shown in Figure 1 a) is used. 7 Specimen 7.1 Specimen dimensions and configurations Specimens shall be prepared either by bonding metal plates or strips together to produce the configuration shown in Figure 1 a) or by bonding adherends that have been machined to the shape shown in Figure 1 b). Th
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