ISO INTERNATIONAL STANDARD 11566 First edition 1996-08-15 Carbon fibre -- Determination of the tensile properties of single-filament specimens Fibres de carbone Détermination des proprietés en traction sur éprouvette monofilament ISO Reference number ISO 11566:1996(E) ISO11566:1996(E) Foreword ISO (the International Organization for Standardization) is a worldwide fed- eration of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through sO technical committees.E 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 ISsO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (lEC) on all matters of electrotechnical standardization. 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. International Standard ISO 11566 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. Annex A forms an integral part of this International Standard. @ISO1996 reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 . CH-1211 Geneve 20 . Switzerland Printed in Switzerland 1i INTERNATIONAL STANDARD ISO ISO 11566:1996(E) Carbon fibre - Determination of the tensile properties of single-filament specimens 1 Scope 3 Definitions ThisInternational Standardspecifiesamethodoftest For the purposes of this International Standard, the for the determination of the tensile properties of a definitions given in ISO 527-1 apply. together with the following. single-filament specimen. The method is applicable to single filaments of carbon 3.1 system compliance: That portion of the indi- fibres, taken from multifilament yarns, strands, tows, cated extension contributed by the load train system staple fibres, staple yarns, woven fabrics, braids and and the specimen-gripping system. knits. 3.2 specimen mounting: A thin sheet made of pa- per, metal or plastic with a slot whose length corre- 2 Normative references sponds to the gauge length of a test specimen. The following standards contain provisions which, 4 Principle throughreferenceinthistext,constituteprovisionsof this International Standard. At the time of publication, the editions indicated were valid. All standards are A single-filament specimen is loaded in tension at a subject to revision, and parties to agreements based constant speed by a suitable mechanical testing ma- on this International Standard are encouraged to in chine until failure and the force-extension curve re- vestigate the possibility of applying the most recent corded. editionsofthestandardsindicatedbelow.Members of IEC and ISO maintain registers of currently valid In- The tensile strength and tensile modulus of elasticity ternational Standards. are calculated from the force-extension relationship and the specimen cross-sectional area. Iso 291:1977, Plastics - Standard atmospheres for conditioning and testing. The tensile modulus of elasticity is calculated by divid- ing the difference in stress at two defined points by ISO 527-1:1993, Plastics - Determination of tensile the corresponding difference in strain at these points properties Part 1: General principles. which may be two stress levels (method A) or two strainlevels(methodB).Thedifferenceinstrainis ISO10548:1994.Carbon fibre- Determination of corrected for the system compliance. The cross- size content. sectional area is determined independently ISO 10618:_1), Carbon fibre -— Determination of The relati