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1、BRITISH STANDARD BS ISO 1268-4:2005 Fibre-reinforced plastics Methods of producing test plates Part 4: Moulding of prepregs ICS 83.120 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 1268-4:2005 This British Standard was published u
2、nder the authority of the Standards Policy and Strategy Committee on 11 January 2006 BSI 11 January 2006 ISBN 0 580 46207 2 National foreword This British Standard reproduces verbatim ISO 1268-4:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted
3、 to Technical Committee PRI/42, Fibre reinforced thermosetting plastics 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 publications
4、referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary p
5、rovisions of a contract. Users are responsible for its 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 interpretat
6、ion, or proposals for change, and keep UK interests 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 14, an inside back cover
7、and a back cover. The BSI copyright notice displayed 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 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO
8、 1268-4:2005(E) INTERNATIONAL STANDARD ISO 1268-4 First edition 2005-03-15 Fibre-reinforced plastics Methods of producing test plates Part 4: Moulding of prepregs Plastiques renforcs de fibres Mthodes de fabrication de plaques dessai Partie 4: Moulage des primprgns BS ISO 1268-4:2005 Licensed Copy:
9、sheffieldun sheffieldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 1268-4:2005 iii Contents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Health and
10、 safety 1 4 Principle . 2 5 Apparatus. 2 6 Procedure. 4 7 Determination of the quality of the test plates. 8 8 Precision 8 9 Test plate preparation report . 8 Annex A (normative) Stacking designation system . 10 Annex B (informative) Precision . 13 Bibliography . 14 Licensed Copy: sheffieldun sheffi
11、eldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 1268-4:2005 iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carr
12、ied 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. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
13、ISO collaborates closely with the International Electrotechnical Commission (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 Internat
14、ional Standards. 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. Attention is drawn to the possibility that some of the e
15、lements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1268-4 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. This first edition cancels and r
16、eplaces ISO 9353:1991, which has been technically revised. It considers input from prEN 2565, EN 2374 and ASTM D 5687. ISO 1268 consists of the following parts, under the general title Fibre-reinforced plastics Methods of producing test plates: Part 1: General conditions Part 2: Contact and spray-up
17、 moulding Part 3: Wet compression moulding Part 4: Moulding of prepregs Part 5: Filament winding Part 6: Pultrusion moulding Part 7: Resin transfer moulding Part 8: Compression moulding of SMC and BMC Part 9: Moulding of GMT/STC Part 10: Injection moulding of BMC and other long-fibre moulding compou
18、nds General principles and moulding of multipurpose test specimens Part 11: Injection moulding of BMC and other long-fibre moulding compounds Small plates Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Fibre-reinforced plastics Methods of
19、 producing test plates Part 4: Moulding of prepregs 1 Scope This part of ISO 1268 describes the preparation of test plates from layers of preimpregnated unidirectional fibre or fabric (prepregs) under pressure and temperature in various types of equipment (for example, autoclave, bladder press, hydr
20、aulic press or vacuum bag equipment). It applies to all reinforcements and resins. This method is applicable to reinforcements preimpregnated either with a partially cured thermosetting resin or with a thermoplastic resin. The test plate is formed by stacking layers of the preimpregnated material in
21、 the required sequence and orientation, followed by compaction and final consolidation under pressure/vacuum at a temperature above ambient. The prepared test plates are subsequently machined into the required test specimens. Standard plates prepared in this manner may be used either for evaluating
22、the components, i.e. the reinforcement, finish, resin, etc., or for verifying the overall quality of the finished product. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undat
23、ed references, the latest edition of the referenced document (including any amendments) applies. ISO 291, Plastics Standard atmospheres for conditioning and testing ISO 1172, Textile-glass-reinforced plastics Prepregs, moulding compounds and laminates Determination of the textile-glass and mineral-f
24、iller content Calcination methods ISO 1183 (all parts), Plastics Methods for determining the density of non-cellular plastics ISO 1268-1, Fibre-reinforced plastics Methods of producing test plates Part 1: General conditions ISO 2818, Plastics Preparation of test specimens by machining ISO 7822, Text
25、ile glass reinforced plastics Determination of void content Loss on ignition, mechanical disintegration and statistical counting methods 3 Health and safety See ISO 1268-1. BS ISO 1268-4:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2
26、 4 Principle Standard plates, intended for the preparation of test specimens, are produced from fibre-reinforced prepregs by cutting the required number of layers to size and stacking them in the required sequence and orientation. The stack of prepregs is initially consolidated and trapped air remov
27、ed using mechanical compaction and/or an applied vacuum. The assembled stack, normally sealed in an evacuated vacuum bag, is then finally consolidated using one of several possible combinations of heat and pressure depending on the equipment used and the material suppliers processing instructions. S
28、uitable processing routes include using an autoclave, a pressclave, an applied vacuum only or a hydraulic press. Plates with flat surfaces are prepared unless the effect of surface finish is being studied. They have to be of sufficient size to cover the maximum specimen size required in subsequent t
29、esting. 5 Apparatus 5.1 Processing equipment 5.1.1 Press, of any type, with the components specified in 5.1.1.1 to 5.1.1.4. 5.1.1.1 The press itself (see Figure 1), consisting of a frame, ram and base. The height of the frame shall be large enough to provide a moulding chamber where the mould contai
30、ning the prepreg stack can be inserted in one operation. A gap between the ram and the frame of at least 0,20 mm shall be ensured by means of appropriately constructed guides. Dimensions in millimetres Key 1 base 2 upper frame 3 columns 4 ram a 1 draft all round. b All-around pinch-off. Figure 1 Mou
31、lding press BS ISO 1268-4:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 5.1.1.2 Open-sided mould (see Figure 2), consisting of two flat metal plates (a base plate and a cover plate) with spacers at the four corners controlling the t
32、hickness of the moulded plate. The dimensions of the plates shall be such that test specimens of the required size can be cut from the test plates produced using the mould. The surfaces of the mould plates facing the mould cavity shall be flat to within 0,05 mm and shall be polished or hard chrome p
33、lated. Suitable mould plate thicknesses are 5 mm for steel and 6 mm for aluminium alloy. NOTE 1 A test plate of specific thickness can be obtained by placing suitably sized spacers between the mould plates at the corners of the mould. NOTE 2 To aid recognition of the zero-degree direction of the tes
34、t plate, an “arrow” can be engraved in the surface of the baseplate. Care is necessary, however, that the “arrow” moulded into each test plate does not affect the properties of the test specimens prepared from the plate. Alternatively, non-square test plates can be moulded (e.g. 350 mm long 300 mm w
35、ide) with the zero-degree direction parallel to the longer side of the plate. Key 1 cover plate 2 base plate 3 guidepieces 4 spacers of suitable thickness Figure 2 Mould 5.1.1.3 Means of applying the required moulding pressure, or executing the required force-time profile, with an accuracy of 5 %, o
36、ver the required period of time. 5.1.1.4 Temperature measurement and control equipment, capable of ensuring a heat-up rate of at least 3 C/min and maintaining the required curing temperature between the specified limits, or executing the required temperature-time profile. 5.1.2 Autoclave, of any dry
37、-heat type, meeting the requirements of 5.1.1.3 and 5.1.1.4. BS ISO 1268-4:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 5.1.3 Ventilated oven, meeting the requirements of 5.1.1.4. 5.1.4 Ruler, for measuring the length and width of
38、the test plate to the nearest 0,5 mm. 5.1.5 Micrometer screw gauge, for measuring the thickness of the test plate to the nearest 0,01 mm. 5.1.6 Balance, capable of weighing to the nearest 0,01 g. 5.1.7 Cutting device, such as a knife, with a sharp blade. 5.18 Vacuum pump, capable of producing a vacu
39、um of 0,08 MPa or better. 5.1.9 Supply of compressed air, capable of applying a pressure of 0,7 MPa 2 %. 5.2 Auxiliary apparatus and materials, as required 5.2.1 Rubber seals, of a shape and size such that they can be placed round the test plate in the mould, and resistant to a temperature at least
40、20 C higher than the curing temperature. 5.2.2 Release film, resistant to a temperature at least 20 C higher than the curing temperature, made of a material such as poly(vinyl fluoride) (PVF), polytetrafluoroethylene (PTFE) or PTFE-coated fabric. 5.2.3 Perforated release film, resistant to a tempera
41、ture at least 20 C higher than the curing temperature, made of a material such as PVF, PTFE or PTFE-coated fabric. 5.2.4 Flexible pressure blanket, resistant to polymerization products and resistant to a temperature at least 20 C higher than the curing temperature, made of a material such as PVF, PT
42、FE or PTFE-coated fabric. 5.2.5 Breather material, such as aluminium gauze or glass-fibre fabric. 5.2.6 Absorbent material, for absorption of excess resin, e.g. woven glass-fibre fabric. NOTE Woven glass-fibre fabrics having a mass per unit area of 100 g/m2 and 300 g/m2 are capable of absorbing appr
43、oximately 60 g and 115 g of resin, respectively, per square metre. Polyamide-fibre fabric having a mass per unit area of 60 g/m2 is capable of absorbing approximately 40 g of resin per square metre. 5.2.7 Metal edge strips, of a suitable length and a width of 15 mm, for placing round the test plate
44、in the mould. The thickness of the strips will depend on the thickness of the test plate to be produced. 5.2.8 Sealing tape, resistant to a temperature at least 20 C higher than the curing temperature. 6 Procedure 6.1 Condition the materials to be used for preparing the test plates, including suffic
45、ient prepreg material, for at least 2 h in one of the standard atmospheres specified in ISO 291. Carry out subsequent preparation of the laminate stack (see 6.4) in the same atmosphere. 6.2 If the material has been stored at a temperature lower than the conditioning temperature, keep it in an airtig
46、ht bag to prevent moisture pick-up until it reaches the conditioning temperature. 6.3 After conditioning, cure thermoset-based material within 6 h, unless otherwise specified. 6.4 From the conditioned prepreg material, cut the number of layers needed to produce a cured test plate of the required len
47、gth, width and thickness, cutting each layer at the orientation required by the lay-up sequence given in the specification or test method (see Annex A). Stack the cut layers of prepreg on the base plate of the mould in the required sequence. BS ISO 1268-4:2005 Licensed Copy: sheffieldun sheffieldun,
48、 na, Mon Nov 27 08:16:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 Insert a thermocouple into the edge of the stack for temperature control of the moulding process. The disposition of the laminate stack and auxiliary materials typically used for autoclave processing is shown in Figure 3 for the p
49、referred test plate with flat faces. If the effect of surface finish is being studied, replace the upper layer of perforated release film by the material relevant to the effect under study. Figure 4 shows the disposition of the laminate stack and auxiliary materials used in various types of bladder press. NOTE 1 The number of layers of absorbent material (5.2.5) used to absorb excess resin will depend on the resin content required f