1、BRITISH STANDARDBS EN ISO 14125:1998Incorporating Fibre-reinforced plastic composites Determination of flexural propertiesICS 83.120g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50
2、g51g60g53g44g42g43g55g3g47g36g58corrigendum July 2002+A1:2011 National forewordThis British Standard is the UK implementation of EN ISO 14125:1998+A1:2011, incorporating corrigendum July 2002. It is identical with ISO 14125:1998, incorporating amendment 1:2011 and corrigendum July 2001. It supersede
3、s BS EN ISO 14215:1998, which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to ISO text carry the number of the ISO amendment. For example, text altered by ISO amendment 1 is indicated by !“.The UK participation
4、 in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to inclide all the necessary provisions of a contr
5、act. Users of British Standards are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN ISO 14125:1998+A1:2011Amendments/corrigenda issued since publicationAmd. No. Date Comments 14168Corrigendum No. 124 February 2003 Revisio
6、n of 1.331 July 2011 Implementation of ISO amendment 1:2011, with CEN endorsement A1:2011.This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on15 June 1998 BSI
7、 2011ISBN 978 0 580 71271 5EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 14125:1998+A1ICS 83.120Incorporating Corrigendum July 2002Descriptors: See ISO documentEnglish versionFibre-reinforced plastic composites Determination of flexural properties (ISO 14125:1998)Composites plastiques renfor
8、cs de fibres Dtermination des proprits de flexion(ISO 14125:1998)This European Standard was approved by CEN on 15 February 1998.CEN members are bound to comply with the CEN/CENELEC InternalRegulations which stipulate the conditions for giving this European Standardthe status of a national standard w
9、ithout any alteration. Up-to-date lists andbibliographical references concerning such national standards may be obtainedon application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French,German). A version in any other language ma
10、de by translation under theresponsibility of a CEN member into its own language and notified to theCentral Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium,Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ir
11、eland,Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and United Kingdom.CENEuropean Committee for StandardizationComit Europen de NormalisationEuropisches Komitee fr NormungCentral Secretariat: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any
12、form and by any means reserved worldwide for CEN national Members.Ref. No. EN ISO 14125:1998 EFebruary 2011 BSI 2011ForewordThe text of the International Standard ISO 14125:1998 has been prepared by Technical Committee ISO/TC 61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plasti
13、cs”, the Secretariat of which is held by IBN.This European Standard supersedes EN 63:1977.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 1998, and conflicting national standards shall b
14、e withdrawn at the latest by September 1998.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland,
15、 Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Endorsement noticeThe text of the International Standard ISO 14125:1998 was approved by CEN as a European Standard without any modification.Endorsement noticeThe text of ISO 14125:1998/Cor.1:2001 has
16、 been approved by CEN as a European Corrigendum without any modifications.Foreword to amendment A1This document (EN ISO 14125:1998/A1:2011) has been prepared by Technical Committee ISO/TC 61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held b
17、y NBN.This Amendment to the European Standard EN ISO 14125:1998 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011.Attention i
18、s drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the fo
19、llowing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Sl
20、ovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.The text of ISO 14125:1998/Amd 1:2011 has been approved by CEN as a EN ISO 14125:1998/A1:2011 without any modification.Endorsement noticeBS EN ISO 14125:1998+A1:2011EN ISO 14125:1998+A1:2011 (E)Incorporating Technical Corrigendum No
21、. 12001-07-15iiContentsPageForeword iiiIntroduction iv1Scope 12 Normative references 13 Principle 24 Definitions 25 Apparatus 36 Test specimens 47 Number of test specimens 68 Conditioning 69 Procedure 610 Calculation and expression of results 711 Precision 912 Test report 10Annex A (normative) Other
22、 test specimens 11Annex B (normative) Large-deflection corrections Calculation and expression of results 11Descriptors: Plastics, reinforced plastics, tests, bend tests, determination, flexural strength, test specimens.BS EN ISO 14125:1998+A1:2011EN ISO 14125:1998+A1:2011 (E) BSI 2011iiiForewordISO
23、(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 a subject for which a technical comm
24、ittee 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 Commission (IEC) on all matters of electrote
25、chnical standardization.Draft International Standards adopted by the technical committees 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.International Standard ISO 14125 was prepared by T
26、echnical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres.Annex A and Annex B form an integral part of this International Standard.BS EN ISO 14125:1998+A1:2011EN ISO 14125:1998+A1:2011 (E)iv BSI 2011IntroductionThis standard is based on ISO 178 but deals with fi
27、bre-reinforced plastic composites. As such it retains the test conditions relevant for glass-fibre-reinforced systems. The test conditions are extended from ISO 178 to include both three-point (Method A) and four-point (Method B) loading geometries, and to include conditions for composites based on
28、newer fibres such as carbon and aramid fibres.Other source documents consulted include ASTM D 790 (four-point loading), prEN 2562 (test conditions), CRAG 200 and JIS K 7074 (use of shims for four-point loading, Figure 6). The overall specimen length for four-point loading is the same as for three-po
29、int loading.The scope of ISO 178 will be revised and limited to unreinforced and filled plastics.EN 63:1977, Glass-reinforced plastics Determination of flexural properties Three-point test, will be withdrawn.BS EN ISO 14125:1998+A1:2011EN ISO 14125:1998+A1:2011 (E) BSI 201111 Scope1.1 This Internati
30、onal Standard specifies a method for determining the flexural properties of fibre-reinforced plastic composites under three-point (Method A) and four-point (Method B) loading. Standard test specimens are defined but parameters included for alternative specimen sizes for use where appropriate. A rang
31、e of test speeds is included.1.2 The method is not suitable for the determination of design parameters, but may be used for screening materials, or as a quality-control test.NOTE For example, the flexural modulus is only an appropriate value of the tensile Youngs modulus of elasticity as the test is
32、 not for the additional deflection due to the shear stress which leads to a lower value of the flexural modulus but uses test span/specimen thickness ratios that minimise this effect. Differences between tensile and flexural properties are also caused by the material structure/lay-up.1.3 The method
33、is suitable for fibre-reinforced thermoplastic and thermosetting plastic composites.ISO 178, Plastics Determination of flexural properties, applies to bulk compounds having fibres shorter than 7,5 mm. This is generally the case with materials intended for injection moulding.1.4 The method is perform
34、ed using specimens which may be moulded to the chosen dimensions, machined from the central portion of the standard multi-purpose test specimen (see ISO 3167) or machined from semi-finished or finished products such as mouldings or laminates.1.5 The method specifies preferred dimensions for the spec
35、imen. Tests which are carried out on specimens of other dimensions, or on specimens which are prepared under different conditions, may produce results which are not comparable. Other factors, such as the speed of testing and the conditioning of the specimens can influence the results. For materials
36、which are not homogeneous through the section, or above the linear-elastic response region, the result applies only to the thickness and structure tested. Consequently, when comparative data are required, these factors must be carefully controlled and recorded.2 Normative referencesISO 178, ISO 291,
37、 ISO 293, ISO 294-1, ISO 295, ISO 1268 (all parts), ISO 2602, ISO 2818, ISO 3167, ISO 5893, The following referenced documents are essential indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the ref
38、erenced document (including any amendments) applies. Plastics Determination of flexural propertiesPlastics Standard atmospheres for conditioning and testingPlastics Compression moulding of test specimens of thermoplastic materialsPlastics Injection moulding of test specimens of thermoplastic materia
39、ls Part 1: General principles, and moulding of multipurpose and bar test specimensPlastics Compression moulding of test specimens of thermosetting materialsFibre-reinforced plastics Methods of producing test platesStatistical interpretation of test results Estimation of the mean Confidence intervalP
40、lastics Preparation of test specimens by machiningPlastics Multipurpose test specimensRubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification!“BS EN ISO 14125:1998+A1:2011EN ISO 14125:1998+A1:2011 (E)2 BSI 20113 PrincipleThe test specimen,
41、 supported as a beam, is deflected at a constant rate until the specimen fractures or until the deformation reaches some pre-determined value. During this procedure, the force applied to the specimen and the deflection are measured.The method is used to investigate the flexural behaviour of the test
42、 specimens and for determining the flexural strength, flexural modulus and other aspects of the flexural stress/strain relationship under the conditions defined. It applies to a freely supported beam, loaded in three- or four-point flexure. The test geometry is chosen to limit shear deformation and
43、to avoid an interlaminar shear failure.NOTE The four-point loading geometry provides a constant bending moment between the central loading members. The compressive contact stresses due to the two central loading members are lower in comparison with the stresses induced under the single loading membe
44、r of the three-point test. The four-point geometry is chosen so that the centre span equals one-third of the outer span. The distance between the outer support points is the same as in the equivalent three-point loading case, therefore the same specimen can be used.4 DefinitionsFor the purpose of th
45、is International Standard, the following definitions apply.4.1 speed of testing, vthe rate of relative movement between the supports and the loading member(s), expressed in millimetres per minute (mm/min)4.2 flexural stress, g214fthe nominal stress in the outer surface of the test specimen at mid-sp
46、an. It is calculated according to the relationship given in Clause 10, equation (3) or (8), and is expressed in megapascals (MPa)4.3 flexural stress at break (rupture), g214fBthe flexural stress at break (or rupture) of the test specimen (see Figure 1, curves A and B). It is expressed in megapascals
47、 (MPa)4.4 flexural strength, g214fMthe flexural stress sustained by the test specimen at the maximum load (see Figure 1) for acceptable failure modes (see subclause 9.9 and Figure 6). It is expressed in megapascals (MPa)4.5 deflection, sthe distance through which the top or bottom surface of the tes
48、t specimen at mid-span has deflected during flexure from its original position. It is expressed in millimetres (mm)4.6 deflection at break, sBthe deflection at break of the test specimen (see Figure 1, curves A and B). It is expressed in millimetres (mm)4.7 deflection at flexural strength, sMthe def
49、lection at the load equal to the flexural strength (4.4) (see Figure 1, curves A and B). It is expressed in millimetres (mm)4.8 flexural strain, g40fthe nominal fractional change in length of an element in the outer surface of the test specimen at mid-span. It is used for calculating the flexural modulus (4.9) and is expressed as a dimensionless ratioBS EN ISO 14125:1998+A1:2011EN ISO 14125:1998+A1:2011 (E) BSI 201134.9 modulus of elasticity in flexure; flexural modulus; chord modulus, Erthe ratio of t
