ISO INTERNATIONAL 20505 STANDARD Second edition 2023-10 Fine ceramics (advanced ceramics, advanced technical ceramics) - Mechanical properties of ceramic composites at room temperature - Determination of the interlaminar shear strength and shear modulus of continuous-fibre-reinforced composites by the compression of double-notched test pieces and by the Iosipescu test Céramiques techniques - Propriétés mécaniques des céramiques composites a température ambiante - Détermination de la résistance au cisaillement interlaminaire et du module de cisaillement des composites renforces par des fibres continues, par la compression d'éprouvettes a double entaille et par I'essai losipescu Reference number IS0 20505:2023(E) ISO @ IS0 2023 IS0 20505:2023(E) COPYRIGHT PROTECTED DOCUMENT @IS02023 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or ISo's member body in the country of the requester. ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii IS02023-Allrightsreserved IS0 20505:2023(E) Contents Page Foreword. ..iv 1 Scope. .1 2 Normative references .1 3 Terms and definitions. 4 Principle. 4.1 General .4 4.2 Double-notched test ..4 4.3 Iosipescu test 4 Apparatus. 5 .5 5.1 Test machine. .5 5.2 Load train. .5 5.2.1 .5 Generalities 5.2.2 Test fixtures. .6 5.3 Strain gauges for Iosipescu test specimen ..8 5.4 Data acquisition. .9 5.5 Dimension-measuring devices. .9 Test specimens .9 6 6.1 Double-notched test piece .9 6.2 Iosipescu test piece .11 7 Test specimen preparation .12 7.1 Machining and preparation. .12 7.2 Bonding of the gauges. .12 7.3 Number of test specimens ..12 Test procedures .12 8 ..12 8.1 Displacement rate. 8.2 Measurement oftest specimen dimensions .. 13 8.3 Testing technique. ..13 8.3.1 Specimen mounting ..13 Measurements. 8.3.2 .14 Test validity 8.4 .15 Calculation of results .16 9 9.1 Shear strength 16 9.1.1 Double-notched test piece .16 9.1.2 Iosipescutestpiece .16 9.2 Shear strain (losipescu test) 17 9.3 Shear-stress-shear-strain curves .. 17 9.4 Elastic shear modulus, pseudo-elastic shear modulus 17 9.5 Statistics. ..18 ..18 10 Report. Annex A (informative) New materials: verification of shear stress field in the Iosipescu test. ..20 Bibliography. .21 iii IS02023-Allrightsreserved