SIST EN 1007-5:2010
(Main)Advanced technical ceramics - Ceramic composites - Methods of test for reinforcements - Part 5: Determination of distribution of tensile strength and of tensile strain to failure of filaments within a multifilament tow at ambient temperature
Advanced technical ceramics - Ceramic composites - Methods of test for reinforcements - Part 5: Determination of distribution of tensile strength and of tensile strain to failure of filaments within a multifilament tow at ambient temperature
This European Standard specifies the conditions, apparatus and procedure for determining the distribution of tensile strength and tensile strain to failure of ceramic filaments in multifilament tows at ambient temperature. This European Standard applies to tows of continuous ceramic filaments, which are assumed to act freely and independently under loading, and behave linearly elastic up to failure.
Hochleistungskeramik - Keramische Verbundwerkstoffe - Verfahren zur Prüfung der Faserverstärkungen - Teil 5: Bestimmung der Verteilung von Zugfestigkeit und Zugdehnung von Fasern im Faserbündel bei Raumtemperatur
Diese Europäische Norm legt die Bedingungen, Geräte und Verfahren zur Bestimmung der Verteilung der Zugfestigkeit und der Bruchdehnung von keramischen Fasern innerhalb eines Faserbündels bei Raum¬temperatur fest.
Diese Europäische Norm gilt für Bündel keramischer Endlosfasern, von denen angenommen wird, dass sie unter Beanspruchung frei und unabhängig sind und sich bis zum Bruch linear-elastisch verhalten.
Céramiques techniques avancées - Céramiques composites - Méthodes d'essais pour renforts - Partie 5: Détermination de la distribution de la résistance en traction et de la déformation de traction à la rupture des filaments dans un fil à température ambiante
La présente Norme européenne spécifie les conditions, appareillages et méthodes de détermination de la distribution de la résistance à la traction et de la déformation en traction à la rupture des filaments céramiques dans un fil multifilaments à température ambiante.
Elle s’applique aux fils constitués de filaments continus de céramique qui sont supposés agir librement et indépendamment les uns des autres lorsqu’ils sont soumis à une charge, et présenter un comportement élastique linéaire jusqu’à la rupture.
Sodobna tehnična keramika - Keramični kompoziti - Preskusne metode za ojačitve - 5. del: Ugotavljanje porazdelitve natezne trdnosti in deformacij/obremenitev vlaken v svežnjih pri visoki temperaturi
Ta evropski standard določa pogoje, aparat in postopek za ugotavljanje porazdelitve natezne trdnosti in deformacij/obremenitve vlaken v svežnjih
pri visoki temperaturi. Ta evropski standard velja za svežnje neprekinjenih keramičnih vlaken, za katere se predpostavlja, da pod obremenitvijo delujejo prosto in neodvisno ter so do deformacije linearno elastične.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.MREUHPHQLWHYHochleistungskeramik - Keramische Verbundwerkstoffe - Verfahren zur Prüfung der Faserverstärkungen - Teil 5: Bestimmung der Verteilung von Zugfestigkeit und Zugdehnung von Fasern im Faserbündel bei RaumtemperaturCéramiques techniques avancées - Céramiques composites - Méthodes d'essais pour renforts - Partie 5: Détermination de la distribution de la résistance en traction et de la déformation de traction à la rupture des filaments dans un fil à température ambianteAdvanced technical ceramics - Ceramic composites - Methods of test for reinforcements - Part 5: Determination of distribution of tensile strength and of tensile strain to failure of filaments within a multifilament tow at ambient temperature81.060.30Sodobna keramikaAdvanced ceramicsICS:Ta slovenski standard je istoveten z:EN 1007-5:2010SIST EN 1007-5:2010en,fr,de01-maj-2010SIST EN 1007-5:2010SLOVENSKI
STANDARDSIST EN 1007-5:20041DGRPHãþD
SIST EN 1007-5:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1007-5
March 2010 ICS 81.060.30 Supersedes EN 1007-5:2003English Version
Advanced technical ceramics - Ceramic composites - Methods of test for reinforcements - Part 5: Determination of distribution of tensile strength and of tensile strain to failure of filaments within a multifilament tow at ambient temperature
Céramiques techniques avancées - Céramiques composites - Méthodes d'essais pour renforts - Partie 5: Détermination de la distribution de la résistance en traction et de la déformation de traction à la rupture des filaments dans un fil à température ambiante
Hochleistungskeramik - Keramische Verbundwerkstoffe - Verfahren zur Prüfung der Faserverstärkungen - Teil 5: Bestimmung der Verteilung von Zugfestigkeit und Zugdehnung von Fasern im Faserbündel bei Raumtemperatur This European Standard was approved by CEN on 13 February 2010.
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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1007-5:2010: ESIST EN 1007-5:2010
EN 1007-5:2010 (E) 2 Contents page Foreword . 31Scope . 42Normative references . 43Terms and definitions . 44Principle . 65Significance and use . 66Apparatus . 66.1Tensile testing equipment . 66.2Load train . 66.3Data recording . 77Test specimens . 77.1General . 77.2Window type specimen . 77.3
Cylindrical end type specimen . 88Test specimen preparation . 88.1General . 88.2Window type specimen . 88.3Cylindrical end type specimen . 98.4Number of test specimens . 98.5Determination of the initial cross sectional area . 98.6Determination of the gauge length . 109Testing technique . 109.1Test specimen mounting . 109.2Selection of strain rate . 109.3Measurement . 119.4Determination of load train compliance . 119.5Test validity . 1110Calculation of results . 1110.1Calculation of the parasitic load train compliances . 1110.2Determination of true origin . 1210.3Construction of envelope curve and determination of instantaneous compliance Ct,j. 1210.4Probability of filament rupture . 1310.5Distribution of filament strain . 1310.5.1Calculation of filament strain . 1310.5.2Distribution of filament strain . 1310.6Distribution of filament strength . 1410.6.1Initial cross sectional area . 1410.6.2Elastic modulus (Young’s modulus) of the tow . 1410.6.3Calculation of filament strength and filament strength distribution . 1510.7Average filament rupture strain and average filament rupture strength . 1510.8Overall average filament rupture strain and overall average filament rupture strength . 1510.9Calculation of tow strength . 1611Test report . 16Bibliography . 18 SIST EN 1007-5:2010
EN 1007-5:2010 (E) 3 Foreword This document (EN 1007-5:2010) has been prepared by Technical Committee CEN/TC 184 “Advanced technical ceramics”, 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 September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. 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. This document supersedes EN 1007-5:2003. EN 1007 Advanced technical ceramics — Ceramic composites — Methods of test for reinforcements has 7 parts: Part 1: Determination of size content Part 2: Determination of linear density Part 3: Determination of filament diameter and cross-section area Part 4: Determination of tensile properties of filaments at ambient temperature Part 5: Determination of distribution of tensile strength and of tensile strain to failure of filaments within a multifilament tow at ambient temperature Part 6: Determination of tensile properties of filaments at high temperature Part 7: Determination of the distribution of tensile strength and of tensile strain to failure of filaments within a multifilament tow at high temperature 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, Croatia, 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 the United Kingdom.
SIST EN 1007-5:2010
EN 1007-5:2010 (E) 4
1 Scope This European Standard specifies the conditions, apparatus and procedure for determining the distribution of tensile strength and tensile strain to failure of ceramic filaments in multifilament tows at ambient temperature.
This European Standard applies to tows of continuous ceramic filaments, which are assumed to act freely and independently under loading, and behave linearly elastic up to failure. 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 1007-2, Advanced technical ceramics — Ceramic composites — Methods of test for reinforcement — Part 2: Determination of linear density CEN/TR 13233:2007, Advanced technical ceramics — Notations and symbols ISO 10119, Carbon fibre — Determination of density 3 Terms and definitions
For the purposes of this document, the terms and definitions given in CEN/TR 13233:2007 and the following apply. 3.1 gauge length
L0 initial distance between two reference points on the tow NOTE Usually the gauge length is taken as the distance between the gripped ends of the tow. 3.2 initial cross sectional area
A0 sum of the cross sectional areas of all the filaments in the tow 3.3 tow elongation
∆∆∆∆L increase of the gauge length between the two reference points on the tow
3.4 tow strain 0 ratio of the tow elongation ûL to the gauge length Lo 3.5 tow maximum tensile force Ftow highest recorded tensile force on the test specimen when tested to failure SIST EN 1007-5:2010
EN 1007-5:2010 (E) 5 3.6 tow strength 1tow ratio of the tow maximum tensile force to the cross sectional area of all unbroken filaments at maximum tensile force, Ftow 3.7 force at step j Fj force applied on the test specimen at step j 3.8 filament strain 0j strain at step j in the non-linear parts of the force-displacement graph 3.9 filament stress
1j ratio of the tensile force to the cross sectional area of all unbroken filaments at step j in the non-linear parts of the force-displacement curve 3.10 average filament rupture strain rε statistical average rupture strain of the filaments in the tow for each test determined from the Weibull strain distribution parameters of the filaments 3.11 overall average filament rupture strain rε arithmetic mean of the average filament rupture strains 3.12 average filament strength rσ statistical average strength of the filaments in the tow for each test determined from the Weibull strength distribution parameters of the filaments 3.13 overall average filament strength rσ arithmetic mean of the average filament strengths 3.14 compliances
3.14.1 initial total compliance Ct inverse slope of the linear part of the force-displacement curve 3.14.2 instantaneous total compliance Ct,j inverse slope of the secant at any point j in the non-linear part of the force-displacement curve SIST EN 1007-5:2010
EN 1007-5:2010 (E) 6 NOTE The slope is taken from a line through any point of the force-displacement curve and the intersection point of the line of the initial total compliance with the abscissa (true origin). 3.14.3 load train compliance Cl ratio of the cross head displacement to the force, excluding any contribution of the test specimen to the displacement during the tensile test 3.14.4 compliance of the tow Ctow instantaneous total compliance of the tow at maximum tensile force 4 Principle A multifilament tow is loaded in tension. The test is performed at a constant displacement rate up to failure of all fibres. Force and cross-head displacement are measured and recorded simultaneously. When required, the longitudinal deformation is derived from the cross-head displacement using a compliance correction. From the force-displacement curve, the two-parameter Weibull distribution of the rupture strain and the distribution of the rupture strength of the filaments are obtained by sampling the non-linear parts of the curve at discrete intervals j, which correspond to an increasing number of failed filaments in the tow. The test duration is limited to reduce time dependent effects. 5 Significance and use The measurement of strain directly on the tow is difficult, so it is usually achieved indirectly via a compliance measurement that includes contributions of the loading train, grips, tab materials, etc. When it is possible to measure the tow elongation directly (by using a suitable extensometer system) this correction is not needed. The calculation of the results in Clause 10 also applies in this case by setting the load train compliance equal to zero. The evaluation method is based on an analysis of the non-linear increasing and decreasing parts of the force-displacement curve, which are caused by progressive filament failure during the test. The occurrence of these stages is promoted by a higher stiffness of the loading and gripping system. This method of evaluation is only applicable when the force-displacement curve shows these non-linear parts. The distribution of filament rupture strains does not depend on the number of filaments in the tow and is hence not affected by the number of filaments that are broken before the test. The determination of the filament strength distribution and of the elastic modulus necessitates knowledge of the initial cross sectional area of the tow. Because the number of unbroken filaments within the tow prior to the test is usually unknown, the values for the filament strength and for the elastic modulus necessarily represent lower bounds to these quantities. Also, the variation in filament diameter, which affects the strength values, is not accounted for. 6 Apparatus 6.1 Tensile testing equipment The test machine shall be equipped with a system for measuring the force applied to the specimen and the displacement, or directly the tow elongation. Additionally, the machine shall be equipped with a system for measuring the crosshea
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