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1、 Reference number ISO 11093-6:2005(E) ISO 2005 INTERNATIONAL STANDARD ISO 11093-6 Second edition 2005-05-01 Paper and board Testing of cores Part 6: Determination of bending strength by the three-point method Papier et carton Essais des mandrins Partie 6: Dtermination de la rsistance la flexion par
2、la mthode des trois points Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 11093-6:2005(E)
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6、05 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the cou
7、ntry of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reserved Copyright International Organization for Standardization Provided by IHS under l
8、icense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 11093-6:2005(E) ISO 2005 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a wor
9、ldwide federation of national standards bodies (ISO 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
10、 that committee. International organizations, governmental 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. International Standards are drafted
11、in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standar
12、d requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 11093-6 was prepared by
13、 Technical Committee ISO/TC 6, Paper, board and pulps. This second edition cancels and replaces the first edition (ISO 11093-6:1996), which has been technically revised. ISO 11093 consists of the following parts, under the general title Paper and board Testing of cores: Part 1: Sampling Part 2: Cond
14、itioning of test samples Part 3: Determination of moisture content using the oven drying method Part 4: Measurement of dimensions Part 5: Determination of characteristics of concentric rotation Part 6: Determination of bending strength by the three-point method Part 7: Determination of flexural modu
15、lus by the three-point method Part 8: Determination of natural frequency and flexural modulus by experimental modal analysis Part 9: Determination of flat crush resistance Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standard
16、s 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19
17、:51 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 11093-6:2005(E) ISO 2005 All rights reserved 1 Paper and board Testing of cores Part 6: Determination of bending strength by the three-point method 1 Scope This part of ISO 11093 specifies a thre
18、e-point method for the determination of the bending strength of cylindrical board cores which meet the following criteria: internal diameter: 50 mm to 300 mm; minimum wall thickness: 5 mm; minimum test length of core (span): 1 100 mm. 2 Normative references The following referenced documents are ind
19、ispensable 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. ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Ten
20、sion/compression testing machines Verification and calibration of the force-measuring system ISO 11093-1, Paper and board Testing of cores Part 1: Sampling ISO 11093-2, Paper and board Testing of cores Part 2: Conditioning of test samples 3 Terms and definitions For the purposes of this document, th
21、e following terms and definitions apply. 3.1 bending strength maximum resistance of a test piece of given dimensions against bending until breakage under specified conditions 4 Principle The core test piece is considered as a “beam“ in the mechanics of material approach. During the test, the test pi
22、ece is stressed by a vertical force (F) at the midpoint of its length while being supported at each end only (see Figure 1). For the determination of the bending strength, stress is applied until the test piece breaks. Copyright International Organization for Standardization Provided by IHS under li
23、cense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 11093-6:2005(E) 2 ISO 2005 All rights reserved F applied force L test length of the core (span) Figure 1 Three-point method
24、of beam loading 5 Apparatus The following apparatus shall be used. 5.1 Load-testing machine The load-testing machine shall be capable of applying a load at a constant relative speed of (25 2,5) mm/min and shall be calibrated and verified to conform to the requirements of ISO 7500-1. The switch-off l
25、imit for the breaking force F for a testing machine with an automatic break detection is defined by 30 N, or 3 % from the true value. The direction of the load application is perpendicular to the test piece axis and shall be adjusted with an accuracy of 1. 5.2 Two prism supports The two prism suppor
26、ts (see Figure 2), shall each have an angle between the two faces supporting the core test piece of 120 2. The length (l), parallel to the core length, shall be (50 1) mm. The width (b) shall be large enough to allow the core test piece to rest on the supporting faces and not on the outer edges of t
27、he prism. The support edges shall be rounded to a radius (r) of (0,5 0,1) mm. The prism support shall be positioned on pivots on each side of the prism, so as to ensure uniform contact of the test piece on the prism and a constant measuring length during the test. Copyright International Organizatio
28、n for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 11093-6:2005(E) ISO 2005 All rights reserved 3 Figure 2 Schematic drawing of p
29、rism support 5.3 Load prism The load prism is used to apply the load to the core surface and is of the same basic shape and dimensions as the prism supports (5.2), except that its length l (see Figure 2) parallel to the core length L (see Figure 1), shall be (100 1) mm. 6 Sampling and preparation En
30、sure that the test pieces used are representative of the sample received. If the determination is to represent a lot, the sampling procedure shall be carried out in accordance with ISO 11093-1. Prepare at least three test pieces such that their lengths are 100 mm greater than the test length of the
31、core, L (see Figure 1). Condition the test pieces in accordance with ISO 11093-2. 7 Procedure Carry out the test under the same atmospheric conditions as those used to condition the test pieces. Arrange the test assembly such that the test piece is located centrally on the prism supports to within 5
32、 mm, and the load prism is positioned centrally between the support prisms to within 2 mm and diametrically opposed to them. The distance between the two axes of the support prisms is the test length of the core, L (see Figure 1). The test length of the core shall be in accordance with Clause 6 and
33、shall be known to an accuracy of 2 mm. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 1109
34、3-6:2005(E) 4 ISO 2005 All rights reserved Apply the load at a constant rate of (25 2,5) mm/min until the test piece breaks. Record the maximum load value, in kilonewtons, as the bending strength. Repeat the test procedure for the remaining test pieces. Calculate the mean bending strength. 8 Test re
35、port The test report shall include the following information a) a reference to this part of ISO 11093; b) complete identification of the samples tested and the sampling method used; c) date and place of sampling; d) date and place of testing, name and signature of tester; e) number of test pieces; f
36、) core dimensions, i.e. length, internal diameter, external diameter; g) test length of core (L); h) individual and average values, expressed in kilonewtons, for bending strength; i) any departure from the procedure specified in this part of ISO 11093 and any circumstances that may have affected the
37、 results. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization
38、for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 11093-6:2005(E) ICS 85.060 Price based on 4 pages ISO 2005 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:19:51 MDTNo reproduction or networking permitted without license from IHS -,-,-