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1、BRITISH STANDARD BS EN 1007-5:2003 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 The European Standard EN 1007
2、-5:2003 has the status of a British Standard ICS 81.060.30 ? Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/09/2004 18:50:37 MST Questions or comments about this message: please call
3、 the Document Policy Group at 303-397-2295. -,-,- BS EN 1007-5:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 9 May 2003 BSI 9 May 2003 ISBN 0 580 41793 X National foreword This British Standard is the official English language version
4、of EN 1007-5:2003. It supersedes DD ENV 1007-5:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request
5、to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “ International Standards Correspondence Index” , or by using the “ Search” facility of the BSI El
6、ectronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers t
7、o understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document c
8、omprises a front cover, an inside front cover, the EN title page, pages 2 to 20, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Copyright British Standards
9、 Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/09/2004 18:50:37 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EUROPEAN STANDARD NORME EUROPENNE EURO
10、PISCHE NORM EN 1007-5 April 2003 ICS 81.060.30Supersedes ENV 1007-5:1998 English 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 multifilam
11、ent tow at ambient temperature Cramiques techniques avances - Cramiques composites - Mthodes dessai pour les renforts - Partie 5: Dtermination des distributions des rsistances en traction et des dformations de traction rupture des filaments dans un fil temprature ambiante Hochleistungskeramik - Kera
12、mische Verbundwerkstoffe - Verfahren zur Prfung von Verstrkungen - Teil 5: Bestimmung der Verteilung von Zugfestigkeit und Zugdehnung von Fasern im Faserbndel bei Raumtemperatur This European Standard was approved by CEN on 14 February 2003. CEN members are bound to comply with the CEN/CENELEC Inter
13、nal 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 Management Centre or to any CEN member.
14、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 Management Centre has the same status as the official versions. CEN members are t
15、he national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROP
16、EN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1007-5:2003 E Copyright British Standards Institution Reproduced by IHS u
17、nder license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/09/2004 18:50:37 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EN 1007-5:2003 (E) 2 Contents page Foreword3 1Scope 4 2Normative refer
18、ences 4 3Principle4 4Significance and use .4 5Terms, definitions and symbols.5 6Apparatus .6 7Test specimen7 8Test specimen preparation.8 9Test procedure.9 10Calculation of results 12 11Test report 17 Annex A (informative) Abstract of the Handbook of Mathematical Functions18 Bibliography20 Copyright
19、 British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/09/2004 18:50:37 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 1007-5:2003 (E)
20、 3 Foreword This document (EN 1007-5:2003) 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 endorseme
21、nt, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latest by October 2003. This document supersedes ENV 1007-5:1998. EN 1007 has six parts: Part 1 : Determination of size content Part 2 : Determination of linear density Part 3 : Determination of filament
22、diameter Part 4 : Determination of tensile properties of filament 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 filament
23、 at high temperature Annex A is informative. This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, Fr
24、ance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licens
25、ee=Bureau Veritas/5959906001, 11/09/2004 18:50:37 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 1007-5:2003 (E) 4 1 Scope This European Standard specifies the conditions for the determination of the distribution of strength and ruptur
26、e strain of ceramic filaments within a multifilament tow at room temperature by performing a single tensile test on a multifilament tow. This European Standard applies to tows of continuous ceramic filaments which are assumed to act freely and independently under loading, and behave linearly elastic
27、 up to failure. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendm
28、ents to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). ENV 1007-2, Advanced technical ceramics - Ceramic composit
29、es - Methods of test for reinforcements - Part 2 : Determination of linear density. ENV 1007-4, Advanced technical ceramics - Ceramic composites - Methods of test for reinforcements - Part 4 : Determination of tensile properties of filament at ambient temperature. ENV 843-5, Advanced technical ceram
30、ics - Monolithic ceramics - Mechanical tests at room temperature Part 5 : Statistical analysis. EN ISO 7500-1, Metallic materials - Verification of static uniaxial testing machines - Part 1 : Tension/compression testing machines (ISO 7500-1:1999). ISO 10119, Carbon fibre - Determination of density.
31、3 Principle A multifilament tow is loaded in tension at a constant displacement rate up to rupture of all the filaments in the tow. The force and displacement are measured and recorded. From the force-displacement curve the two-parameter Weibull distribution of the rupture strain and of the strength
32、 of the filaments is 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 linear part of the force-displacement curve may be used to determine Youngs modulus of the filament. 4 Significance and us
33、e Because measurement of the displacement directly on the tow is difficult, it is usually obtained indirectly via a compliance measurement which includes contributions of the loading train, of the grips, of the tabbing materials, etc. These contributions have to be corrected for in the analysis. Whe
34、n 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
35、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. When the force-displacement curve does not show thes
36、e non linear parts the evaluation method of this standard cannot be applied. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/09/2004 18:50:37 MST Questions or comments about this mess
37、age: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 1007-5:2003 (E) 5 The distribution of filament rupture strain does not depend on the number of filaments in the tow and is hence not affected by the number of filaments which are broken before the test. The determination of the f
38、ilament strength distribution and of the elastic modulus requires 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 repre
39、sent lower bounds to these quantities. Also, the variation in filament diameter, which affects the strength values, is not accounted for. Because of the difference in the evaluation, the values of the Weibull modulus for the filament rupture strain and for the filament strength are slightly differen
40、t. The Weibull parameters determined by this test method and extrapolated to the respective gauge length cannot be compared directly with those obtained from tensile tests on monofilaments according to ENV 1007-4 because of the large difference in test conditions. 5 Terms, definitions and symbols Fo
41、r the purposes of this European Standard, the following terms, definitions and symbols apply. 5.1 gauge length, L0 initial distance between two reference points on the tow NOTEUsually the gauge length is taken as the distance between the gripped ends of the tow. 5.2 initial cross section area, A0 cr
42、oss section area of the tow 5.3 tow elongation, L increase of the gauge length between the two reference points during the tensile test 5.4 compliance 5.4.1 total compliance, Ct ratio of the measured displacement to the corresponding force during the tensile test 5.4.2 load train compliance, Cl rati
43、o of the load train elongation, excluding the specimen contribution, to the corresponding force during the tensile test 5.5 strain, ratio of the tow elongation L to the gauge length L0 5.6 filament rupture strain, r,j strain at step j in the non linear parts of the force-displacement curve 5.7 filam
44、ent strength, r,j ratio of the tensile force to the cross section area of all unbroken filaments at step jin the non linear parts of the force-displacement curve Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bur
45、eau Veritas/5959906001, 11/09/2004 18:50:37 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 1007-5:2003 (E) 6 5.8 average filament strength, r statistical average strength of the filaments in the tow for each test determined from the We
46、ibull strength distribution parameters of the filaments 5.9 mean filament strength, r arithmetic mean of the average strengths 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
47、the tow elongation. The machine shall conform to grade 1 or better in EN ISO 7500-1. The grips shall align the specimen with the direction of the force. Slipping of the specimen in the grips shall be prevented. NOTEThe use of a displacement transducer placed at the ends of the grips (see Figure 1) s
48、hould limit the contribution of different parts of the load train to the measured displacement, and hence should increase the accuracy. Key 1Displacement transducer 2Grip 3Test specimen Figure 1 6.2 Data recording A calibrated recorder shall be used to record force-displacement curves. The use of a digital data recording system combined with an analogue recorder is recommended. Copyright British St