BS EN ISO 14129-1998 Fibre-reinforced plastic composites - Determination of the in-plane shear stress shear strain response including the in-plane shear modulus and strength by the.pdf

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1、BRITISH STANDARD BS EN ISO 14129:1998 Fibre-reinforced plastic composites Determination of the in-plane shear stress/shear strain response, including the in-plane shear modulus and strength by the 45 tension test method The European Standard ENISO14129:1997 has the status of a British Standard ICS 8

2、3.120BSEN ISO 14129:1998 This British Standard, having been prepared under the direction of the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 April 1998 BSI 05-1999 ISBN 0 580 29468 4 National foreword This British Standard

3、 is the English language version of ENISO14129:1997. It is identical with ISO14129:1997. The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which has the responsibility to: aid enquirers to understand the text; p

4、resent to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee ca

5、n be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement int

6、ernational or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provi

7、sions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title

8、page, page 2, the ISO title page, pages ii to iv, pages 1 to 6, aninside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publica

9、tion Amd. No. Date CommentsBSENISO14129:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Foreword iii Text of ISO 14129 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14129 December 1997 ICS 83.120; 83.140.20 Descriptors: See ISO document English ve

10、rsion Fibre-reinforced plastic composites Determination of the in-plane shear stress/shear strain response, including the in-plane shear modulus and strength, by the +/45 tension test method (ISO 14129:1997) Composites plastiques renforcs de fibres Dtermination de la rponse contrainte-dformation en

11、cisaillement plan, module et rsistance compris, par essai de traction +/45 (ISO 14129:1997) Faserverstrkte Kunststoffe Zugversuch an45 - Laminaten zur Bestimmung der Schubspannungs/Schubverformungs-Kurve, des Schubmoduls und der Schubfestigkeit in der Lagenebene (ISO 14129:1997) This European Standa

12、rd was approved by CEN on 23 November 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning

13、such national standards may be obtained on 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 made by translation under the responsibility of a CEN member into its own langua

14、ge and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swi

15、tzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

16、 Ref. No. EN ISO 14129:1997 EENISO 14129:1997 BSI 05-1999 2 Foreword The text of the International Standard ISO14129:1997 has been prepared by Technical Committee ISO/TC61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN. This Europe

17、an Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 1998, and conflicting national standards shall be withdrawn at the latest by June 1998. According to the CEN/CENELEC Internal Regulations, the national st

18、andards organizations of the following countries are bound to implement, this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsem

19、ent notice The text of the International Standard ISO14129:1997 was approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative)EN ISO14129:1997 ii BSI 05-1999 Contents Page Foreword iii Introduction 1 1 Scope

20、 1 2 Normative references 1 3 Principle 1 4 Definitions 2 5 Apparatus 2 6 Test specimens 3 7 Number of test specimens 3 8 Conditioning 4 9 Procedure 4 10 Calculation and expression of results 4 11 Precision 5 12 Test report 5 Annex A (normative) Specimen preparation 6 Annex ZA (normative) Normative

21、references to international publications with their relevant European publications Inside back cover Figure 1 Fibre-reinforced plastic composite specimen showing fibre axes 2 Figure 2 Unidirectional reinforced composite plate element showing symmetryaxes 3 Figure 3 Shear stress/shear strain diagram

22、5 Figure A.1 Tabbed panel for specimen preparation 6 Descriptors: Plastics, reinforced plastics, tests, shear tests, determination, shear strength, shear modulus, test specimens.ENISO14129:1997 BSI 05-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federatio

23、n 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 that committee.

24、 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. Draft International Standards adopted by the technic

25、al committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO14129 was prepared by Technical Committee ISO/TC61, Plastics, Subcommittee SC13, Composites and reinf

26、orcement fibres. Annex A forms an integral part of this International Standard.iv blankENISO14129:1997 BSI 05-1999 1 Introduction This International Standard covers all current and future fibre-reinforced plastic composites which fail in the required manner. Harmonisation with the new tensile standa

27、rd, ISO527-5:1997, Plastics Determination of tensile properties Part 5: Test conditions for unidirectional fibre-reinforced plastic composites, has been achieved where relevant (e.g.document format, specimen size and related strains for modulus measurement). The test is acceptable for modulus but th

28、ere is concern over its use for the ultimate shear strength for high shear-elongation materials due to the high strain at failure with only a small further increase in load, fibre rotation and associated temperature rise. Therefore, the stress at a maximum shear strain of5% or less is used as the fa

29、ilure criterion. This failure criterion is also used in ASTM D3518 (1995). 1 Scope 1.1 This International Standard specifies a procedure for determining the in-plane shear stress/shear strain response, including the in-plane shear modulus and shear strength, of fibre-reinforced plastic composites by

30、 the 45 tension test method. 1.2 The method is suitable for use with thermoset and thermoplastic matrix laminates made from unidirectional layers and/or fabrics including unidirectional fabrics, with the fibres, oriented at 45 to the specimen axis, where the lay-up is symmetrical and balanced about

31、the specimen mid-plane. NOTEThe method is not suitable for coarse fabrics. 1.3 As the test has been shown to be sensitive to the number and distribution of layers, comparisons should be undertaken using the same number of layers, which must be well distributed. 2 Normative references The following s

32、tandards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged

33、 to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 291:1997, Plastics Standard atmospheres for conditioning and testing. ISO 1268:1974, Plastics Preparation o

34、f glass fibre reinforced, resin bonded, low-pressure laminated plates or panels for test purposes 1) . ISO 2602:1980, Statistical interpretation of test results Estimation of the mean Confidence interval. ISO 2818:1994, Plastics Preparation of test specimens by machining. ISO 5893:1993, Rubber and p

35、lastics test equipment Tensile, flexural and compression types (constant rate of traverse) Description. 3 Principle A test specimen consisting of a strip of rectangular cross-section with the fibres oriented at 45 to the specimen axis is loaded in tension. To determine the shear modulus the strains

36、parallel and perpendicular to the specimen axis are measured. The test is terminated at 12 =0,05 if failure (excluding premature failure at or within the grip) has not occurred. NOTEAlthough this test method can establish shear stress/shear strain response well into the nonlinear region, the ultimat

37、e stress and strain values so obtained should be evaluated with the following caution. The material in the gauge section of this specimen is not in a state of pure shear, as normal stress components are present, even in the rotated ply coordinate system. It has been established that when a 45 lamina

38、te is loaded in tension, normal stress components, though small, generally decrease the calculated ultimate stress and strain values of the material below the actual capability of the material, thus resulting in lower values of ultimate strength and strain than those obtained by more ideal methods,

39、such as the tube torsion test. 1) Under revision.EN ISO14129:1997 2 BSI 05-1999 4 Definitions For the purposes of this International Standard, the following definitions apply: 4.1 in-plane shear stress, 12 the shear stress obtained by dividing the instantaneous load by twice the specimen cross-secti

40、onal area it is expressed in megapascals (MPa) 4.2 in-plane shear strength, 12M the maximum in the shear stress prior to or at termination of the test at 12 =0,05 it is expressed in megapascals (MPa) 4.3 shear strain, 12 the sum total of strain in the direction parallel and perpendicular to the spec

41、imen axis, i.e. ( x y ) NOTE yhas an negative sign when xis positive. 4.4 in-plane shear (chord) modulus, G 12 the shear stress difference ( 12 12 ) divided by the corresponding shear strain difference ( 12 = 0,005 12 = 0,001) see 10.3, equation (3). it is expressed in megapascals (MPa) 4.5 specimen

42、 coordinate axes for the specimen shown in Figure 1, the direction parallel to the specimen longitudinal axis is the “x” direction and the direction perpendicular to it is the“y” direction. The fibres are oriented at 45 to these directions. The coordinate axes for a unidirectional reinforced composi

43、te material plate element are shown in Figure 2. 5 Apparatus 5.1 Test machine 5.1.1 General The machine shall conform to ISO5893 as appropriate to the requirements given in 5.1.2 and5.1.3. 5.1.2 Speed of testing The speed of testing v shall be kept constant in accordance with ISO5893. Figure 1 Fibre

44、-reinforced plastic composite specimen showing fibre axesENISO14129:1997 BSI 05-1999 3 5.1.3 Load indicator The load indicator shall be such that the error in the indicated force is less than 1% of the full-scale reading (see ISO5893). 5.2 Strain measurement The procedure requires the strain to be m

45、easured both parallel and perpendicular to the specimen axis. Strain gauges, applied as in Figure 2, or extensometers shall be accurate to 1% of the full scale. The gauges, surface preparation and bonding agents shall be chosen to give adequate performance on the subject materials, and suitable stra

46、in-recording equipment shall be employed. 5.3 Micrometer, or equivalent, capable of reading to0,01mm or less, and suitable for measuring the thickness h and width b of the test specimen. The micrometer shall have contact faces appropriate to the surface being measured (i.e.flat faces for flat, polis

47、hed surfaces and hemispherical faces for irregular surfaces). 6 Test specimens 6.1 Shape and dimensions The specimen shall have a width of25mm 0,5mm and a length of250mm. Unless otherwise specified, the thickness shall be2mm 0,2mm. The longitudinal edges of individual specimens shall be parallel to

48、within0,2mm. The dimensions of the specimen are shown in Figure 1. For materials made with layers thicker than0,125mm, the laminate shall consist of16layers. 6.2 Preparation of specimens 6.2.1 General A panel shall be prepared in accordance with ISO1268 or another specified/agreed procedure with the

49、 required balanced and symmetrical 45 fibre orientation. Cut individual specimens or groups of specimens to the required size. Some parameters for machining are specified in ISO2818. Further guidance on cutting specimens is given in Annex A. 6.2.2 End tab material Providing failure does not occur at or within the grip, unbonded tabs or no tabs may be used. If tabs are used, they shall be constructed from a cross-ply or fabric laminate made of glass-fibre/res