BSISO 12986-2:2014 IS012986-2:2014(E) 8.2 Flexural strength,0b Theflexural strength, ob,inMPais calculated usingtheformula in3.1and Formula (2) Ise . Fmax Ob= (2) where z is the section modulus, in mm3 (seeFigure 2); Ise isthedistancebetweenthesupportandtheforce-bearingedge(leverageofforce, see Figure 1), in mm; Fmax is the maximum force, in N. In the case of test specimens with square cross-section and Ise=h,the flexural strengthob in MPa is calculated accordingtoFormula (3): (3) h? In the case of cylindrical test specimens and Ise =D,the flexural strength in MPa squared is calculated accordingtoFormula (4): (4) 元·D2 &D h D ad a) Square b) Rectangle c) Circle d) Ring h3 b.h? 元,(D4-d4) Z=元·D3 Z= Z= Z : 6 6 32 32 D Key Z sectionmoment,inmm3 height of a rectangular cross-section, in mm h breadth ofa rectangularcross-section, inmm b D external diameter ofa circular cross-section, in mm d internal diameter ofa ring cross-section,in mm Figure2-Calculationofsectionmomentsforcross-sectionsofthemostcommongeometries @ IS0 2014 - All rights reserved 5 BSISO12986-2:2014 IS012986-2:2014(E) 9Precision The uncertainty of measurement when testing with this method of testing is approximately5 % foraconfidencelevelof95%underrepeatabilityconditionsfortestpieceswithdimensions of 30mm×110mm. 10 Test report Thetestreportshallcontainthefollowinginformation: a: areferencetothis partofISo12986; b) type,positionand orientation oftestspecimens duringthesamplingprocedure; c) designation ofthe test specimens; d) number oftest specimens; e lineardimensions oftestspecimens,inmillimetres; f) flexural strength, ob,inMPa,rounded tothe nearest O,1MPa, individual values and mean value; g) additionallyagreedconditionsdeviatingfromthis International Standard; h) test date. 6 @ IS0 2014 - All rights reserved BS ISO 12986-2:2014 IS012986-2:2014(E) Bibliography [1] ISO13385-1,Geometrical productspecifications(GPS)—Dimensional measuringequipment Part1:Callipers;Designandmetrologicalcharacteristics [2] DIN51944,Testingof carbonaceousmaterials-Determination offlexural strengthbyfourpoint method-Solidmaterials ISo2014-All rights reserved 7 BSISO12986-2:2014 IS012986-2:2014(E) ICS71.100.10 Price based on 7 pages IS0 2014 - All rights reserved This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSl is the national body responsible for preparing British Standards and other standards-related publications, information and services BSi is incorporated by Royal Charter. British Standards and other standardization products are published by BSi Standards Limited About us Revisions We bring together business, industry, government, consumers, innovators Our British Standards and other publications are updated by amendment or revision. and others to shape their combined experience and expertise into standards We continually improve the quality of our products and services to benefit your -based solutions. business. If you find an inaccuracy or ambiguity within a British Standard or other The knowledge embodied in our standards has been carefully assembled in BSI publication please inform the Knowledge Centre. a dependable format and refined through our open consultation process. Copyright Organizations of all sizes and across all sectors choose standards to help them achieve their goals. All the data, software and documentation set out in all British Standards and other BSI publications are the property of and copyrighted by BSl, or some person Information on standards or entity that owns copyright in the information used (such as the international We can provide you with the knowledge that your organization needs standardization bodies) and has formally licensed such information to BSI for to succeed. Find out more about British Standards by visiting our website at commercial publication and use. Except as permitted under the Copyright, Designs bsigroup.com/standards or contacting our Cu