Methods of test for refractory products - Part 1: Determination of dynamic Young's modulus (MOE) by impulse excitation of vibration (ISO 12680-1:2005)

ISO 12680-1:2005 specifies a method for determining the dynamic Young's modulus of rectangular cross-section bars and circular cross-section specimens of refractories by impulse excitation of vibration. The dynamic Young's modulus is determined using the resonant frequency of the specimen in its flexural mode of vibration.

Verfahren zur Prüfung von feuerfesten Erzeugnissen - Teil 1: Bestimmung des dynamischen E-Moduls durch Schwingungs-Impulsanregung (ISO 12680-1:2005)

Méthodes d'essai pour produits réfractaires - Partie 1: Détermination du module de Young dynamique (MOE) par excitation de vibration par impulsion (ISO 12680-1:2005)

L'ISO 12680-1:2005 spécifie une méthode permettant de déterminer le module de Young dynamique de barres de section rectangulaire ou d'éprouvettes cylindriques de matériaux réfractaires par excitation de vibration par impulsion. Le module de Young dynamique est déterminé à l'aide de la fréquence de résonance de l'éprouvette dans son mode de vibration en flexion.

Metode za preskušanje ognjevzdržnih izdelkov - 1. del: Ugotavljanje dinamičnega Youngovega modula (MOE) z impulzi, vzbujenimi z vibracijo (ISO 12680-1:2005)

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Status
Published
Publication Date
20-Feb-2007
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
21-Feb-2007
Completion Date
21-Feb-2007

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Methods of test for refractory products - Part 1: Determination of dynamic Young's modulus (MOE) by impulse excitation of vibration (ISO 12680-1:2005)Méthodes d'essai pour produits réfractaires - Partie 1: Détermination du module de Young dynamique (MOE) par excitation de vibration par impulsion (ISO 12680-1:2005)Verfahren zur Prüfung von feuerfesten Erzeugnissen - Teil 1: Bestimmung des dynamischen E-Moduls durch Schwingungs-Impulsanregung (ISO 12680-1:2005)Ta slovenski standard je istoveten z:EN ISO 12680-1:2007SIST EN ISO 12680-1:2007en;fr;de81.080Ognjevzdržni materialiRefractoriesICS:SLOVENSKI

STANDARDSIST EN ISO 12680-1:200701-julij-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 12680-1February 2007ICS 81.080 English VersionMethods of test for refractory products - Part 1: Determination ofdynamic Young's modulus (MOE) by impulse excitation ofvibration (ISO 12680-1:2005)Méthodes d'essai pour produits réfractaires - Partie 1:Détermination du module de Young dynamique (MOE) parexcitation de vibration par impulsion (ISO 12680-1:2005)Verfahren zur Prüfung von feuerfesten Erzeugnissen - Teil1: Bestimmung des dynamischen E-Moduls durchSchwingungs-Impulsanregung (ISO 12680-1:2005)This European Standard was approved by CEN on 4 February 2007.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 CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 12680-1:2007: E

EN ISO 12680-1:2007 (E)
Foreword

The text of ISO 12680-1:2005 has been prepared by Technical Committee ISO/TC 33 "Refractories” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 12680-1:2007 by Technical Committee CEN/TC 187 "Refractory products and materials", 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 August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, 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.

Endorsement notice

The text of ISO 12680-1:2005 has been approved by CEN as EN ISO 12680-1:2007 without any modifications.

Reference numberISO 12680-1:2005(E)© ISO 2005

INTERNATIONAL STANDARD ISO12680-1First edition2005-06-15Methods of test for refractory products —Part 1: Determination of dynamic Young's modulus (MOE) by impulse excitation of vibration Méthodes d'essai pour produits réfractaires — Partie 1: Détermination du module de Young dynamique (MOE) par excitation de vibration par impulsion

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ISO 12680-1:2005(E) © ISO 2005 – All rights reserved iiiContents Page Foreword............................................................................................................................................................iv 1 Scope.....................................................................................................................................................1 2 Normative references...........................................................................................................................1 3 Terms and definitions...........................................................................................................................1 4 Principle.................................................................................................................................................2 5 Significance and use............................................................................................................................3 6 Apparatus..............................................................................................................................................3 7 Sampling................................................................................................................................................5 8 Test specimens.....................................................................................................................................5 9 Procedure..............................................................................................................................................5 10 Calculations...........................................................................................................................................7 11 Test report...........................................................................................................................................10 Annex A (informative)

Factors affecting accuracy of determinations........................................................11

ISO 12680-1:2005(E) iv © ISO 2005 – All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12680-1 was prepared by Technical Committee ISO/TC 33, Refractories. ISO 12680 consists of the following parts, under the general title Methods of test for refractory products: =Part 1: Determination of dynamic Young's modulus (MOE) by impulse excitation of vibration The following part is under preparation: =Part 2: Determination of static modulus of elasticity

INTERNATIONAL STANDARD ISO 12680-1:2005(E) © ISO 2005 – All rights reserved 1Methods of test for refractory products — Part 1: Determination of dynamic Young's modulus (MOE) by impulse excitation of vibration 1 Scope This part of ISO 12680 specifies a method for determining the dynamic Young's modulus of rectangular cross-section bars and circular cross-section specimens of refractories by impulse excitation of vibration. The dynamic Young's modulus is determined using the resonant frequency of the specimen in its flexural mode of vibration. NOTE Although not specifically described in this part of ISO 12680, this method can also be used at high temperatures with suitable equipment modification. This part of ISO 12680 does not address the safety issues associated with its use. It is the responsibility of the users of this standard to establish appropriate safety and health practices. 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. ISO 5022:1979, Shaped refractory products — Sampling and acceptance testing ISO 8656-1:1988, Refractory products — Sampling of raw materials and unshaped products — Part 1: Sampling scheme 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 modulus of elasticity MOE ratio of stress to strain below the proportional limit 3.2 proportional limit greatest stress which a material is capable of sustaining without deviation from proportionality of stress to strain (Hooke's Law) 3.3 anti-nodes locations, generally two or more, of local maximum displacement in an unconstrained slender bar or rod in resonance NOTE For the fundamental flexural resonance, the anti-nodes are located at the two ends and the centre of the specimen.

ISO 12680-1:2005(E) 2 © ISO 2005 – All rights reserved 3.4 flexural vibrations displacements in a slender rod or bar in the plane normal to its length 3.5 homogeneous uniform composition, density and texture NOTE A result of homogeneity is that any smaller specimen taken from the original is representative of the whole. In refractory practice, as long as the geometrical dimensions of the specimen are large with respect to the size of individual grains, crystals, components, pores and microcracks, the body can be considered homogeneous. 3.6 in-plane flexure, noun flexural mode for rectangular parallelepiped geometry specimens in which the direction of the displacement is in the major plane of the specimen 3.7 isotropic, adj. condition of a specimen such that the values of the elastic properties are the same in all directions in the specimen 3.8 nodes location on a slender rod or bar in resonance having a constant zero displacement NOTE For the fundamental flexural resonance of such a rod or bar, the nodes are located at 0,224 L from each end, where L is the length of the specimen. 3.9 out-of-plane flexure flexural mode for rectangular parallelepiped geometry specimens in which the direction of the displacement is perpendicular to the major plane of the specimen 3.10 resonant frequency natural frequencies of vibration of a body driven into flexural vibration NOTE Resonant frequencies are determined by the elastic modulus, mass and dimensions of the specimen. The lowest resonant frequency in a vibrational mode is the fundamental resonant frequency of that mode. 3.11 slender rod slender bar specimen whose ratio of length to minimum cross-section thickness or diameter is at least 5 NOTE This applies to dynamic elastic property testing. 4 Principle A test specimen of suitable geometry is excited mechanically with a single elastic strike of an impulse tool, called a hammer, and its fundamental resonant frequency is determined. A transducer (e.g. contact accelerometer or non-contacting microphone) senses the mechanical vibrations in the specimen resulting from the excitation and transforms the vibrations into electrical signals. Specimen supports, impulse locations and signal pick-up points are selected to induce and measure a specific mode of transient vibrations, i.e. the flexural mode. The signals are analysed and a signal analyser that provides data about the frequency and/or the period of the specimen's vibration determines the fundamental resonant frequency. The appropriate fundamental resonant frequency, dimensions and mass of the specimen are used to calculate the dynamic Young's modulus.

ISO 12680-1:2005(E) © ISO 2005 – All rights reserved 35 Significance and use This test method may be used for refractory characterization, development and quality control purposes. This test method is appropriate for determining the modulus of elasticity of refractory bodies that are homogeneous in nature. This method addresses the determination of the dynamic moduli of elasticity of slender rectangular bars and cylindrical rods. This test method is non-destructive in use so it may be used on specimens prepared for other tests. The specimens are subjected to only minute strains; hence the moduli are measured at or near the origin of the stress-strain curve with a minimum possibility of specimen fracture. The test provides options for variations in test specimen sizes and procedure to accommodate most refractory compositions and textures. The impulse excitation test method utilizes an impact tool (hammer) and simple supports for the test specimen. This test method is not suitable for specimens with major cracks or voids. This test method is limited to determining moduli of specimens with regular geometries, such as rectangular parallelepipeds and cylinders, for which analytical equations are available to relate geometry, mass and modulus to the resonant vibration frequency. The analytical equations assume parallel or concentric dimensions for the geometry of the specimens. Deviations in the dimensions of the specimens will introduce errors in the calculations and in the results of the tests. Uneven or excessively rough surfaces of as-formed specimens can have a significant effect on the accuracy of the determinati

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