《BS-ISO-15024-2001.pdf》由会员分享，可在线阅读，更多相关《BS-ISO-15024-2001.pdf（32页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS ISO 15024:2001 Fibre-reinforced plastic composites Determination of mode I interlaminar fracture toughness, GIC, for unidirectionally reinforced materials ICS 83.120 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na,
2、 Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 15024:2001 This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 3
3、0 January 2002 BSI 30 January 2002 ISBN 0 580 38868 9 National foreword This British Standard reproduces verbatim ISO 15024:2001 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics
4、 and prepregs, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standa
5、rds 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 provisions of a contract. Users of British Standards are responsible fo
6、r their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK i
7、nterests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 24, an inside back cover and a back cover. The BSI copyright date di
8、splayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 15024:2001(E) INTERNATIONAL STANDARD ISO 150
9、24 First edition 2001-12-01 Fibre-reinforced plastic composites Determination of mode I interlaminar fracture toughness, GIC, for unidirectionally reinforced materials Composites plastiques renforcs de fibres Dtermination de la tnacit la rupture interlaminaire en mode I, GIC, de matriaux composites
10、matrice polymre renforcs de fibres unidirectionnelles Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E) lcsid FDParemi ihTs PDF file mac ytnoaie nmt deddebyfepca.se In ccaocnadre with Aebods licsneilop gnic,y this file mairp
11、eb yntiv ro deewb detu slahl ton ide ebtlnu desse tt ehyfepacse whice era hml era deddebicsnede to i dnanstlaled t noeh comtupfrep reomrign tide ehti.gn In wodnlidaogn this file, trapies ccatpe tiereht nsnopser ehibility fo ton infriignA gnebods licnesilop gnic.y I ehTStneC Oarl Secrteiraat cacepts
12、l oniibality in this .aera Ai ebods a tredamafo kr Aebod SystemI sncotaropr.de teDails fo ts ehoftwaorp ercudts ust deo crtaet ehis PDF file ceb na fi dnuon tlareneG eh Info leratit evo tf ehile; tP ehD-Fcrtaeiarap nomtesre were tpoimizf deoirp rnti.gn Evyre casah er t neebakt neo snet eruhat tf ehi
13、le is suitlbaf eosu rI yb eSO memidob rebse. In the lnuikletneve y ttah alborp emler ati gnto it is fnuo,dlp saee inform ttneC ehlar Secrteiraat at tsserdda ehig leb nevwo. ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E)
14、 iii Contents Page Foreword.iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Principle2 5 Apparatus.5 6 Test specimens7 7 Number of specimens.8 8 Conditioning.8 9 Test procedure.9 10 Calculation of GIC.10 11 Precision.15 12 Test report15 Annex A (normative) Preparation and bonding of
15、 the load blocks or piano hinges .17 Annex B (informative) Recommendations for testing.18 Annex C (informative) Recommended test result sheet .21 Bibliography24 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E) iv Foreword IS
16、O (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 co
17、mmittee 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 electro
18、technical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the me
19、mber 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 International Standard may be the subject of patent rights. ISO shall not be held responsib
20、le for identifying any or all such patent rights. ISO 15024 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. Annex A forms a normative part of this International Standard. Annexes B and C are for information only. Licensed Copy: sheffi
21、eldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 15024:2001(E) 1 Fibre-reinforced plastic composites Determination of mode I interlaminar fracture toughness, GIC, for unidirectionally reinforced materials 1 Scope 1.1 This International
22、Standard specifies a method for the determination of mode I interlaminar fracture toughness (critical energy release rate), GIC, of unidirectional fibre-reinforced plastic composites using a double cantilever beam (DCB) specimen. 1.2 It is applicable to carbon-fibre-reinforced and glass-fibre-reinfo
23、rced thermosets and thermoplastics. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do n
24、ot apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Membe
25、rs of ISO and IEC maintain registers of currently valid International Standards. ISO 291:1997, Plastics Standard atmospheres for conditioning and testing ISO 1268 (all parts), Fibre-reinforced plastics Methods of producing test plates ISO 4588:1995, Adhesives Guidelines for the surface preparation o
26、f metals ISO 5893:1), Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Description 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 mode I interlaminar fracture toughness crit
27、ical energy release rate GIC the resistance to the initiation and propagation of a delamination crack in unidirectional fibre-reinforced polymer matrix composite laminates under mode I opening load NOTE It is measured in joules per square metre. 1) To be published. (Revision of ISO 5893:1993) 1 Lice
28、nsed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E) 2 3.2 mode I crack opening the crack-opening mode due to a load applied perpendicular to the plane of delamination using the double cantilever beam specimen shown in Figure 1 3.3
29、NL point the point of deviation from linearity on the load versus displacement trace as shown in Figure 2 3.4 VIS point the point of the onset of delamination, as determined by visual observation, at the edge of the specimen, marked on the load-displacement trace as shown in Figure 2 3.5 5 % / MAX p
30、oint the point which occurs first on loading the specimen between: a) the point of 5 % increase in compliance (C5 %) from its initial value (C0) as shown in Figure 2; b) the maximum load point as shown in Figure 2 3.6 PROP points points of discrete delamination length increments beyond the tip of th
31、e insert or starter crack tip marked on the load-displacement trace in Figure 2, points where the crack has been arrested being excluded 3.7 delamination-resistance curve R-curve a cross-plot of GIC for initiation and subsequent propagation values for mode I crack opening as a function of delaminati
32、on length (see clause 10) 4 Principle A mode I double cantilever beam (DCB) specimen, as shown in Figure 1, is used to determine GIC, the critical energy release rate, or interlaminar fracture toughness, of fibre-reinforced plastic composites. The test method is limited to zero-degree unidirectional
33、 lay-ups only (see clause B.1). Data reduction yields initiation and subsequent propagation values of GIC for mode I opening fracture toughness. A delamination-resistance curve, or R-curve, is generated by plotting GIC on the ordinate as a function of delamination length plotted on the abscissa. The
34、 aim of the test method is to determine initiation values for the composite material tested. Delamination typically occurs between plies of dissimilar orientation in composite structures. However, in the DCB test the delamination cracks are grown between similar zero-degree unidirectional plies, res
35、ulting in fibre bridging after the delamination crack initiates. This fibre bridging is an artifact of the DCB test and is not representative of the composite material tested. Fibre bridging is considered to be the main cause for the observed shape of the R-curve, which typically rises before reachi
36、ng a roughly constant value of GIC for long delamination lengths. A crack-opening load is applied to the DCB specimen, perpendicular to the plane of delamination, through load blocks or piano hinges under displacement control at a constant rate. The DCB specimen contains a thin, non- adhesive starte
37、r film embedded at the midplane as shown in Figure 3, which is used to simulate an initial delamination. The specimen is precracked by unloading the DCB specimen immediately after the first increment of delamination growth from the insert, followed by re-loading. The onset of stable delamination gro
38、wth is monitored and the delamination initiation and propagation readings are recorded. The R-curve is plotted with the initiation values from both the insert and the mode I precrack, and with the propagation from the precrack. Under certain prescribed circumstances (see 9.2.7), an alternative wedge
39、 precracking procedure can be used but is not recommended. 2 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E) ISO 1002 Allir thgser sedevr 3 a) Starter delamination using load blocks b) Starter delamination using piano hinge
40、s Key b Specimen width 2h Specimen thickness a0 Initial delamination length a Total delamination length A Insert length l Specimen length l1 Distance from centre of loading pin (or piano hinge axis) to midplane of specimen l2 Distance from centre of loading pin (or piano hinge axis) to edge of load
41、block (or piano hinge) l3 Block length H Block thickness NOTE 1 Alternative loading arrangements are (a) load blocks and (b) piano hinges. NOTE 2 The fibre orientation is parallel to the length l. Figure 1 Geometry for the double cantilever beam (DCB) specimen with a starter delamination 3 Licensed
42、Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E) 4 ISO 1002 Allr ithgsr esedevr Key 1 Crack initiation followed by unloading 2 Crack propagation 3 Crack propagation markers NOTE Figure shows case where 5 % values follow maximum load,
43、 and reload curve has been offset 5 mm for clarity. Figure 2 Load-displacement curve for a DCB test showing (1) initiation from the insert followed by unloading and (2) re-initiation from the resulting mode I precrack followed by crack propagation and unloading 4 Licensed Copy: sheffieldun sheffield
44、un, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E) ISO 1002 Allir thgser sedevr 5 Key 1 Film insert 2 Fibre direction d Margin to allow for initial trimming Figure 3 An example of test plate preparation showing the laminate structure, the dimensions and the posi
45、tion of the film insert 5 Apparatus 5.1 Test machine 5.1.1 General The tensile-testing machine shall comply with ISO 5893 and the requirements given in 5.1.2 to 5.1.5. 5.1.2 Speed of testing The test machine shall be capable of maintaining the constant displacement rate required in 9.2.1 and 9.3.1,
46、as specified in ISO 5893. 5 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:15:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15024:2001(E) 6 ISO 1002 Allir thgser sedevr 5.1.3 Fixture The test machine shall be equipped with a fixture to introduce the load to the pins inserted into the
47、load blocks or with grips to hold the piano hinges. In each case, rotation of the specimen end shall be allowed. The axis of the load-introduction fixtures shall be aligned with the loading axis of the test machine. 5.1.4 Load and displacement measurements The load cell shall be calibrated and shall
48、 have a maximum permissible error of 1 % of the indicated value. The error in the displacement measurement, normally taken from cross-head movements corrected for any significant loading-train deflection, shall be no greater than 1 % of the indicated value. 5.1.5 Recorder The test machine shall allo
49、w the displacement and corresponding load to be measured and recorded, preferably on a continuous basis. 5.2 Load blocks or piano hinges Load blocks or piano hinges, as shown in Figure 1, may be used for introducing the load into the specimen. They shall be at least as wide as the specimen. For the load blocks in Figure 1 a), the maximum value of l3 shall be 15 mm. The hole to inset the loading pin shall be at the centre of l3. 5.3 Measuring apparatus 5.3.1 Micrometer, or equivalent, capable of reading to 0,02 mm or less, suita