IS0 10345 PT*2 92 485190305052181 INTERNATIONAL ISO STANDARD 10345-2 First edition 1992-05-01 Glass -- Determination of stress-optical coefficient - Part 2: Bending test Verre -Determination du coefficient photo-élastique Partie2:Essaideflexion Reference number ISO 10345-2:1992(E) roduction or networking permitted without license from IHS Not for Resale 485190305052193 IS0 10345 PT*2 92 ISO 10345-2:1992(E) Foreword Iso (the Internationa! Organization for Standardization) is a worldwide federation of national standards bodies (lso 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, govern- mental 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard Iso 10345-2 was prepared by Technical Com- mittee iso/Tc 48, Laboratory glassware and related apparatus, Sub- Committee sc 5, Quality of glassware. Iso 10345 consists of the following parts, under the general title Glass --- Determination of stress-optical coefficient: Part 1: Tensile test Part 2: Bending test Annex A of this part of 1so 10345 is for information only ISO1992 All rights reserved, No part of this publicatlon may be reproduced or utHlized In any form or by any means, electronic or mechanical, including photocopying and microfitm, without permisslon inwritingfromthepublisher. InternationalOrganizationforStandardization CasePostaie56CH-1211Geneve20Switzerland Printed in Switzerland ense from IHS Not for Resale IS0 10345 PT*2 92 4851903 0505220 INTERNATIONAL STANDARD ISO 10345-2:1992(E) Glass -- Determination of stress-optical coefficient -- Part 2: Bending test Scope NOTE1 The stress-optical coefficient is a function of the 1 wavelength. It can be either positive or negative. This part of iso 10345 describes the bending test for determining the stress-optical coefficient of isotropic 3 Principle glass. The stress-opticai coefficient is a character- istic value of materials and it is necessary for de- Uniaxial loading of the test specimen in the bending terminingthestressfromresultsofmeasurement test and stress-optical measurement of the optical of stress birefringence. path difference in the range of the invariable trans verse moment at the point of maximum compressive stress and maximum tensile stress (edge of test 2Definition specimen) For the purposes of this part of IsO 10345, the fol- Apparatus lowing definition applies. 4.1 Devices for measuring the test specimen di- 2.1 stress-optical coefficient: Ratio of birefringence mensions, suitable for measuring the breadth b and effect to applied uniaxial stress on an optical ma- height h of the test specimen to the nearest terial. [Iso 9802[1]] 0,01 mm. As .1 K= ... (1) 4.2 Apparatus, consisting of stressing equipment and polarization measuring equipment. where The stressing equipment (see figure 1) consists es- K is the stress-optical coefficient: sentially of two specimen supports and two bending edges with loading pieces to be hung on gimbals As is the optical path difference; The ratio of the support span lsto the distance of the a is the light path in the test specimen bending edges la should be 5:1 (see figure2), for (which is identical with the breadth b of examplels---100mmand la = 20 mm. The four the test specimen): ediges shnaii be of a minimum length of 24 mm. The mass of the loading piece to be applied depends on a is the tensile or compressive stress. the loading bearing cap