《ISO-1268-8-2004.pdf》由会员分享，可在线阅读，更多相关《ISO-1268-8-2004.pdf（16页珍藏版）》请在三一文库上搜索。
1、 Reference number ISO 1268-8:2004(E) ISO 2004 INTERNATIONAL STANDARD ISO 1268-8 First edition 2004-05-15 Fibre-reinforced plastics Methods of producing test plates Part 8: Compression moulding of SMC and BMC Plastiques renforcs de fibres Mthodes de fabrication de plaques dessai Partie 8: Moulage par
2、 compression des SMC et BMC ISO 1268-8:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer per
3、forming the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this
4、PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central
5、 Secretariat at the address given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at t
6、he address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reserved -,-,- ISO 1268-8:2004(E) ISO 2004
7、 All rights reserved iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Health and safety 1 5 Plate dimensions.2 6 Apparatus.2 7 Sampling and conditioning2 8 Procedure.3 9 Stabilization.4 10 Test plate preparation report.5 Annex A (informative)
8、 Applicable test methods6 Bibliography .8 ISO 1268-8:2004(E) iv ISO 2004 All rights reserved 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 carried
9、 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. ISO
10、 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 Internation
11、al 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 elem
12、ents 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 1268-8 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. Together with the other parts (see
13、below), this part of ISO 1268 cancels and replaces ISO 1268:1974, which has been technically revised. 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 moulding Part 3:
14、 Wet compression moulding Part 4: Moulding of prepegs 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 compounds General princi
15、ples and moulding of multipurpose test specimens Part 11: Injection moulding of BMC and other long-fibre moulding compounds Small plates ISO 1268-8:2004(E) ISO 2004 All rights reserved v Introduction Compression moulding of SMC and BMC differs from that of all other compression-mouldable reinforced
16、thermosetting materials. Because of the maturation process which typically takes place before moulding and the ability of the compound to flow during moulding, special procedures need to be used for the production of test plates from these compounds. Two different methods are given for preparing the
17、 mould charge: method A for moulding without the material flowing in the mould and method B for moulding so that the material flows in the mould. For engineers designing new moulds, knowledge of the anisotropy imparted to the moulding under defined moulding conditions is essential. It is therefore n
18、ecessary for the test plates from which test specimens will be cut to be manufactured under comparable conditions. -,-,- INTERNATIONAL STANDARD ISO 1268-8:2004(E) ISO 2004 All rights reserved 1 Fibre-reinforced plastics Methods of producing test plates Part 8: Compression moulding of SMC and BMC 1 S
19、cope This part of ISO 1268 specifies the general principles and procedures for the compression moulding of test plates from two types of fibre-reinforced thermosetting moulding compound: sheet moulding compound (SMC) and bulk moulding compound (BMC). The aim of this part of ISO 1268 is to ensure the
20、 preparation of flat test plates from which test specimens can be cut (for the relevant test methods, see Annex A). The plates are produced in such a way that specimens cut from them give representative results when used in these test methods. 2 Normative references The following referenced document
21、s are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 472, Plastics Vocabulary ISO 8604, Plastics Prepregs Definitions of terms and
22、symbols for designations ISO 12115:1997, Fibre-reinforced plastics Thermosetting moulding compounds and prepregs Determination of flowability, maturation and shelf life EN 1842, Plastics Thermoset moulding compounds (SMC - BMC) Determination of compression moulding shrinkage 3 Terms and definitions
23、For the purposes of this part of ISO 1268, the terms and definitions given in ISO 472 and ISO 8604, together with the the following, apply. 3.1 compression time time during which the required pressure is applied to the mould 4 Health and safety This part of ISO 1268 is limited to describing test pla
24、te preparation methods. The conditions under which the materials used are handled shall comply with the national regulations in force in each country and the staff shall be informed of the hazards involved and appropriate precautions taken. ISO 1268-8:2004(E) 2 ISO 2004 All rights reserved 5 Plate d
25、imensions The recommended moulded-plate size is 200 mm 590 mm (necessary for method II in ISO 12115:1997). If no suitable mould is available, use a mould with a minimum area of 300 cm2 to make plates by method A only, the dimensions of the mould being such that at least five test specimens measuring
26、 20 mm 250 mm can be cut from the plates. Most of the methods of test for SMC and BMC require a test specimen thickness of about 4 mm. In special cases, test plates of other thicknesses will have to be moulded. For particular test methods, the moulded plate specified in EN 1842 could be used. 6 Appa
27、ratus 6.1 Press Test plates may be moulded on any hydraulic moulding press which complies with the following requirements: it is capable of closing the mould and applying the specified moulding pressure within a maximum of 15 s; it is capable of maintaining the specified pressure to within 5 % durin
28、g the compression time. 6.2 Mould The mould used shall be able to withstand the specified temperature and pressure. The mould design shall ensure that the entire force is applied to the moulding material. The mould cavity shall be flat and have an area of at least 300 cm2 for method A or 200 mm 590
29、mm for method B. 6.3 Cooling rack A device or fixture shall be used to hold the test plates while they cool. A non-metallic cooling rack with slots to hold the plates in a vertical position spaced at least 20 mm apart is recommended. The ends of the plates should preferably be protected from damage.
30、 To ensure symmetrical cooling of all test plates, the outer plates shall be protected by additional protective plates. 7 Sampling and conditioning 7.1 With SMC, take the sample from the full width of the roll. Trim 5 cm off both sides of the sample to eliminate edge effects resulting from the manuf
31、acturing process. 7.2 With BMC, take a sample representative of the material from a production batch. 7.3 Immediately after sampling, protect the material by placing it in a suitable bag to avoid loss of volatile constituents and absorption of moisture. Condition samples to establish temperature equ
32、ilibrium before moulding by placing them in a room at a temperature of (23 2) C. -,-,- ISO 1268-8:2004(E) ISO 2004 All rights reserved 3 8 Procedure 8.1 Preparation of charge 8.1.1 Method A: For moulding without the material flowing in the mould With SMC, 100 % mould-surface coverage is recommended,
33、 but it shall not be less than 90 % of the total cavity area unless otherwise specified or agreed between the interested parties. Prepare the SMC required to charge the mould by stacking the necessary number of layers. Note the sequence and orientation of the layers. If a mould coverage of less than
34、 100 % is used, reduce both the length and the width of the layers proportionately in order to prevent flow during moulding altering the orientation of the fibres. With BMC, pre-shape the moulding material manually on a flat tray to give a flat layer with as even a thickness as possible and of the s
35、ame size as the mould cavity. 8.1.2 Method B: For moulding so that the material flows in the mould Prepare the charge as specified in method II of ISO 12115:1997 to give an initial mould-surface coverage of between 25 % and 30 % (see Figure 1). Dimensions in millimetres Key 1 charge Figure 1 Charge
36、covering 25 % to 30 % of total area of mould cavity 8.2 Moulding conditions The mould temperature shall be 140 C 2 C, unless otherwise specified or agreed. The moulding pressure and the compression time shall be as given in the relevant material specification. -,-,- ISO 1268-8:2004(E) 4 ISO 2004 All
37、 rights reserved 8.3 Moulding procedure 8.3.1 Set the moulding conditions to those to be used. 8.3.2 Prepare the charge as described in 8.1.1 or 8.1.2 to obtain the specified test plate thickness. 8.3.3 Weigh the charge. 8.3.4 Load the charge into the mould cavity taking care that it is in the centr
38、e of the mould cavity, if applicable and close the press immediately. As soon as the specified pressure is reached, start measuring the compression time. 8.3.5 When the compression time is complete, open the press, remove the moulded plate and place it in the cooling rack to cool to room temperature
39、. 8.3.6 Discard any defective plates. 8.3.7 Measure the thickness of each plate. 9 Stabilization It is recommended that, unless otherwise specified or agreed, the test plates are kept for 48 h at the ambient conditions in the laboratory before cutting the test specimens from them. When cutting test
40、specimens from plates produced using charges prepared by method B, cut them as shown in Figure 2. Key 1 direction of flow 2 specimens perpendicular to direction of flow 3 specimens parallel to direction of flow 4 discard NOTE There is an end effect perpendicular to the direction of flow, so the left
41、-hand end strip (4) has to be discarded. Any edge effect in the corresponding area at the right-hand end of the plate is confined to the tab area of the test specimens and thus does not affect the value of the property measured. The edges parallel to the direction of flow do not exhibit significant
42、edge effects, so do not need to be discarded. Figure 2 Areas of flow and directions in which specimens are cut from the moulded plate ISO 1268-8:2004(E) ISO 2004 All rights reserved 5 10 Test plate preparation report The test plate preparation report shall include the following information: a) a ref
43、erence to this part of ISO 1268; b) a full description of the moulding material used, including at least the type, the source of supply, the manufacturers name and the designation of the material; c) the date of manufacture of the material; d) the type and size of mould used; e) a description of the
44、 charge (length, width, mass and number of layers for SMC, mass of charge for BMC); f) the moulding conditions (temperature, pressure, compression time); g) identification of the plates, using a suitable numbering or code system; h) the thickness of the plates; i) details of any incidents or modific
45、ations to the procedure which might influence the properties of test specimens taken from the test plates. -,-,- ISO 1268-8:2004(E) 6 ISO 2004 All rights reserved Annex A (informative) Applicable test methods Test specimens cut from of test plates prepared in accordance with this part of ISO 1268 ca
46、n be used for the following test methods. This list is purely informative and will not be updated every time a test method is amended, revised or withdrawn. A.1 Mechanical properties ISO 179-1, Plastics Determination of Charpy impact properties Part 1: Non-instrumented impact test ISO 179-2, Plastic
47、s Determination of Charpy impact properties Part 2: Instrumented impact test ISO 180, Plastics Determination of Izod impact strength ISO 527-1, Plastics Determination of tensile properties Part 1: General principles ISO 527-2, Plastics Determination of tensile properties Part 2: Test conditions for
48、moulding and extrusion plastics ISO 527-4, Plastics Determination of tensile properties Part 4: Test conditions for isotropic and orthotropic fibre-reinforced plastic composites ISO 14125, Fibre-reinforced plastic composites Determination of flexural properties ISO 14126, Fibre-reinforced plastic composites Determination of compressive properties in the in-plane direction ISO 6603-1, Plastics Determination of puncture impact behaviour of rigid plastics Part 1: Non- instrumented impact testing ISO 6603-2, Pl