EN 10319-2:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Metallic materials - Tensile stress relaxation testing - Part 2: Procedure for bolted joint modelsMatériaux métalliques - Essai de relaxation en traction - Partie 2: Mode opératoire pour modeles d'assemblages boulonnésMetallische Werkstoffe - Relaxationsversuch unter Zugbeanspruchung - Teil 2: Prüfverfahren mit SchraubenverbindungsmodellenTa slovenski standard je istoveten z:EN 10319-2:2006SIST EN 10319-2:2007en77.040.10Mehansko preskušanje kovinMechanical testing of metalsICS:SLOVENSKI
STANDARDSIST EN 10319-2:200701-marec-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10319-2October 2006ICS 77.040.10 English VersionMetallic materials - Tensile stress relaxation testing - Part 2:Procedure for bolted joint modelsMatériaux métalliques - Essai de relaxation en traction -Partie 2: Mode opératoire pour modèles d'assemblagesboulonnésMetallische Werkstoffe - Relaxationsversuch unterZugbeanspruchung - Teil 2: Prüfverfahren mitSchraubenverbindungsmodellenThis European Standard was approved by CEN on 6 August 2006.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, Romania,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© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10319-2:2006: E

Information concerning different types of thermocouples.21 Annex B (informative)
Information concerning methods of calibration of thermocouples.22 Bibliography.23

3.8.1 specified initial elastic strain (εεεεeo) initial elastic strain of the bolt at the beginning of the test
NOTE The specified initial elastic strain is calculated from the extension during tensioning ∆Lo (reo/LLo∆=ε) or is measured directly on the cylindrical length of the bolt with strain gauges. 3.8.2 residual elastic strain (εεεεer) strain calculated from the reverse extension ∆Lt (rterLL∆ε=) or directly measured in the cylindrical length of the bolt with strain gauges during unloading of the bolt at the end of the test 3.9 stress at any time during the test, force divided by the original cross-sectional area (So) of the bolt between: A distinction is made between: 3.9.1 initial stress (σσσσοοοο) stress at the start of the test, expressed as a product of the static elastic modulus ET at the test temperature and the specific initial elastic strain εeo eoTεσ×=Eo
(1) 3.9.2 residual stress (σσσσrt) value to which the stress of the bolt has relaxed at the specified time t, after the test, expressed as the product of the elastic modulus ET or ETd and the residual elastic strain erTrtεσ×=E
(2) NOTE The dynamic modulus of elasticity ETd should be taken, if the static modulus of elasticity ET at test temperature is not available. 4 Symbols and designations The symbols and corresponding designations are given in Table 1.

Specified initial elastic strain εer
Residual elastic strain ET GPa Static modulus of elasticity at test temperature ETd GPa Dynamic modulus of elasticity at test temperature σo MPaa Initial stress σrt MPa Residual stress at time t t h Test duration T °C Specified temperature Ti °C Indicated temperature a 1 MPa=1 N/mm2. 5 Principle The test consists of tensioning a test piece in the form of a bolt in a bolted joint model device to a specified initial elastic strain, subjecting the bolt to that strain for specific temperature and time and determining the residual stress in the bolt by unloading at the end of the test. The constant tensile strain and residual stress are derived from an extension measurement referring to the overall length of the bolt (bolted joint model A) or from strain gauge measurements at the cylindrical length of the bolt (bolted joint model B), all measurements being performed at room temperature. 6 Apparatus 6.1 Bolted joint model device 6.1.1 General In the bolted joint model, a bolt with a cylindrical length and threaded ends is tensioned by two nuts against a flange (Figure 1). Bolts, flanges and nuts shall be of the same material.
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