BS ISO 14603-2012 Fine ceramics (advanced ceramics advanced technical ceramics) Test method for open-hole tension of continuous fibre-reinforced ceramic matrix composites at room t.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 14603:2012Fine ceramics (advancedceramics, advanced technicalceramics) Test methodfor open-hole tension ofcontinuous fibre-reinforcedceramic matrix composites atroom tempe

2、ratureBS ISO 14603:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 14603:2012. The UK participation in its preparation was entrusted to TechnicalCommittee RPI/13, Advanced technical ceramics.A list of organizations represented on this committee can be obta

3、ined on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012ISBN 978 0 580 70807 7 ICS 81.060.30 Compliance

4、with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 14603:2012 ISO 2012Fine ceramics (adv

5、anced ceramics, advanced technical ceramics) Test method for open-hole tension of continuous fibre-reinforced ceramic matrix composites at room temperatureCramiques techniques Mthode dessai de traction dprouvette troue de composites matrice cramique renforcs de fibres continues temprature ambianteIN

6、TERNATIONAL STANDARDISO 14603First edition2012-11-01Reference number ISO 14603:2012(E)BS ISO 14603:2012ISO 14603:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in an

7、y 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 country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09

8、 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 14603:2012ISO 14603:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Terms and definitions . 14 Principle . 25 Apparatus 25.1 Test machine . 25.2 Load train and grip 25.3 Strai

9、n measurement . 25.4 Data recording system . 35.5 Dimension-measuring devices 36 Test specimens 37 Test specimen preparation . 57.1 Machining and preparation . 57.2 Number of test specimens 58 Test condition . 59 Test procedure . 59.1 Displacement or loading rate . 59.2 Measurement of test specimen

10、dimensions 59.3 Strain gauges . 69.4 Bending load . 69.5 Test specimen mounting . 69.6 Measurement 69.7 Test validity . 610 Calculation of results . 710.1 Open-hole tensile strength . 710.2 Average value, standard deviation and coefficient of variation . 711 Test report . 7Bibliography . 9BS ISO 146

11、03:2012ISO 14603:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide 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

12、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 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commissi

13、on (IEC) on all matters of electrotechnical standardization.International Standards are drafted 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 com

14、mittees 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.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not

15、be held responsible for identifying any or all such patent rights.ISO 14603 was prepared by Technical Committee ISO/TC 206, Fine ceramics.iv ISO 2012 All rights reservedBS ISO 14603:2012INTERNATIONAL STANDARD ISO 14603:2012(E)Fine ceramics (advanced ceramics, advanced technical ceramics) Test method

16、 for open-hole tension of continuous fibre-reinforced ceramic matrix composites at room temperature1 ScopeThis International Standard describes a test method for the determination of open-hole tensile strengths of ceramic matrix composite materials with continuous fibre reinforcement at room tempera

17、ture. This method applies to all ceramic matrix composites with a continuous fibre reinforcement, bi-directional (2D), and tri-directional (xD, with 2 x 3), tested along an arbitrary axis of reinforcement.This test method is useful for two different objectives. One is material characterizations incl

18、uding material selections, and the other is determination of the stress allowable for designing a component with holes.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only

19、 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: Tension/compression testing machines Verification and calibration of the force-

20、measuring systemISO 3611, Geometrical product specifications (GPS) Dimensional measuring equipment: Micrometers for external measurements Design and metrological characteristics3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1gauge lengthGLlength

21、 calculated by subtracting the grip lengths (both sides) from the specimen overall length3.2initial cross-section areaAoinitial cross-section of the test specimen (disregarding hole)3.3tensile strainstrain measured by a strain gauge at a given location on the test specimen surface3.4maximum tensile

22、forceFmhighest recorded tensile force in a tension test on the test specimen when tested to failure3.5open-hole tensile strengthSmratio of the maximum tensile force to the initial cross-section area ISO 2012 All rights reserved 1BS ISO 14603:2012ISO 14603:2012(E)3.6minimum distance between holesTmin

23、imum distance between holes in a structural component with aligned holes4 PrincipleA test specimen with a circular hole of specified dimensions is loaded in tension. The test is performed at a constant crosshead displacement rate or at a constant loading rate. The force and longitudinal deformation

24、are measured and recorded simultaneously.5 Apparatus5.1 Test machineThe machine shall be equipped with a system for measuring the force applied to the test specimen which shall conform to grade 1 or better according to ISO 7500-1.5.2 Load train and gripThe load train is composed of the moveable and

25、fixed crosshead, the loading rods and the grips. A direct-type hydraulic or mechanical grip can be used as shown in Figure 1. Load-train couplers may additionally be used to connect the grips to the loading rods to prevent bending and/or torsion.The load train shall align the test specimen axis with

26、 the direction of force application without introducing bending or torsion in the test specimen. The grips shall apply sufficient lateral pressure to prevent slippage between the grip face and the specimen.Grips are used to clamp and load the test specimen. The grip design shall prevent the test spe

27、cimen from slipping. The grips must align the test specimen axis with that of the applied force.The misalignment of the specimen, as well as the load train, might be checked according to CEN/TS 15867.5.3 Strain measurementFor continuous measurement of the longitudinal deformation as a function of th

28、e applied force strain gauges should be used. If the misalignment of the specimen, as well as the load train, is checked according to CEN/TS 15867 before testing, the strain measurement for each specimen can be omitted.Strain gauges are used for the verification of the alignment on the test specimen

29、. They may also be used for measuring longitudinal deformation during testing. In both cases, the length of the strain gauges shall be such that the readings are not affected by local features on the surface of the specimen such as fibre crossovers. Care shall be taken to ensure that the strain gaug

30、e readings are not influenced by the surface preparation and the adhesive used. In principle, the length of strain gauge is more than twice the length of unit-cell size for 2D and xD composites.2 ISO 2012 All rights reservedBS ISO 14603:2012ISO 14603:2012(E)1234Key1 specimen2 wedge grip face3 grip b

31、ody4 grip mechanismFigure 1 Example of indirect wedge-type grip faces5.4 Data recording systemA calibrated recorder may be used to record force-deformation curves.5.5 Dimension-measuring devicesDevices used for measuring linear dimensions of the test specimen shall be accurate to 0,01 mm. Micrometer

32、s shall be in accordance with ISO 3611.6 Test specimensThe test specimen geometry of a plate-shaped specimen is represented in Figure 2, and recommended dimensions are given in Table 1. There are two types of test specimen geometries for the different purposes. For material characterization purposes

33、 including materials selections, the specimen width (b) shall be 6 d. For stress that is allowable for determination purposes to design a component with aligned holes as shown in Figure 3, two cases should be considered depending on the minimum distance (T) between holes in the structural component.

34、 If T 6d, the specimen width (b) shall be 6 d. If T 6d, the specimen width (b) shall be T/2.For the surface finish condition, two types of test specimens can be distinguished: As-fabricated test specimens, where only the length and the width are machined to the specified size. In this case, the two

35、faces of the test specimen may present irregular surfaces while the two edges present regular machined surfaces. Machined test specimens, where the length and the width, as well as the two faces of the test specimen, have been machined and present regular machined surfaces.Tolerance on the thickness

36、 dimension only applies to machined test specimens. ISO 2012 All rights reserved 3BS ISO 14603:2012ISO 14603:2012(E)L hLgGL LgdbFigure 2 Open-hole tension test specimenTable 1 Recommended dimensions for open-hole tension test specimenDimensions in millimetres1D, 2D, xD Toleranced, hole diameter 10 d

37、 4 0,05L, total length 20 d GL, gauge length 10 d 2h, specimen thickness 6 h 1,5 (as-fabricated test specimens)0,05 (machined test specimens)b, specimen width 6 d or T/2 a0,1Lg, gripping length 5 d 2Parallelism of specimen width 0,05 Parallelism of specimen thickness (only for machined test specimen

38、s)0,05 aT; minimum distance between holes in a structural component with aligned holes (see Figure 3).4 ISO 2012 All rights reservedBS ISO 14603:2012ISO 14603:2012(E)bTTFigure 3 Schematic drawing illustrating the definition of the minimum distance between holes in a structural component with aligned

39、 holes7 Test specimen preparation7.1 Machining and preparationWhen extracting test specimens from as-fabricated plates of material, care shall be taken to align the test specimen axis with the desired fibre-related loading axis.Machining parameters which avoid damage to the material shall be establi

40、shed and documented. These parameters shall be adhered to during test specimen preparation.7.2 Number of test specimensAt least five valid test results (9.6) are required.8 Test conditionThe temperature and relative humidity of the room shall be 23 C 2 C, and 50 % 10 %, respectively.9 Test procedure

41、9.1 Displacement or loading rateThe test shall be carried out under constant displacement or loading rate. Use a displacement or loading rate which allows test specimen failure between 10 and 60 s. The displacement or loading rate shall be reported.9.2 Measurement of test specimen dimensionsThe cros

42、s-section area shall be determined at the centre of the test specimen and at the two portions 15 mm from the centre. The arithmetic means of the measurements shall be used for calculations.Necessary dimensions shall be measured with an accuracy of 0,01 mm. ISO 2012 All rights reserved 5BS ISO 14603:

43、2012ISO 14603:2012(E)9.3 Strain gaugesDouble strain gauges shall be located on both sides of the specimen centreline 15 mm from the centre of the circular hole, in order to ascertain the bending load.9.4 Bending loadDuring a tensile test, the test specimen may be subjected to bending. To be sure of

44、the validity of the test, it is necessary to verify that no bending occurs under the conditions of the test. This verification shall be carried out every time. If the misalignment of the specimen as well as the load train is checked according to CEN/TS 15867 before testing, this process can be skipp

45、ed.The degree of bending is acceptable if the differences between the back-to-back strain measurements appears for the values of linear stress/strain domain remains such that:“,+ 02 (1)where is the tensile strain measured on the front face; is the tensile strain measured on the back face in the same

46、 cross-section.A system showing excessive bending for the given application should be readjusted or modified.9.5 Test specimen mountingInstall the test specimen in the gripping system or loading system with its longitudinal axis coinciding with that of the test machine. Care shall be taken not to in

47、duce flexural or torsional loads.Tabs made of aluminium, copper, glass fibre reinforced polymer composites (GFRP), cardboards, and others can be bonded on the specimen grip areas. These tabs are effective for axis alignment, and for preventing fracture in the grips.9.6 MeasurementThe test procedure

48、is as follows; zero the force transducer; zero the strain gauges; initiate recording the force versus longitudinal deformation (or strain); initiate loading the test specimen and terminate loading of the test specimen at the end of test; terminate recording the force versus longitudinal deformation

49、(or strain); note the maximum tensile force and the position of fracture location.9.7 Test validityThe following circumstances invalidate a test: failure to specify and record test conditions; failure to meet specified test conditions; failure to meet bending criteria according to 9.4;6 ISO 2012 All rights reservedBS ISO 14603:2012ISO 14603:2012(E) test specimen slippage in the grips; fracture in the grips; fracture in an area without a