BS-2782-3-METHOD-352F-1996 ISO-7765-2-1994.pdf
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1、BRITISH STANDARD BS 2782-3: Method 352F: 1996 ISO 7765-2: 1994 Methods of testing plastics Part 3: Mechanical properties Method 352F: Determination of impact resistance by the free-falling dart method (instrumented puncture test) ICS 83.080 Licensed Copy: London South Bank University, London South B
2、ank University, Tue Dec 12 08:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-3: Method 352F:1996 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 o
3、n 15 September 1996 BSI 10-1998 The following BSI references relate to the work on this standard: Committee reference PRI/75 Draft for comment 89/39133 DC ISBN 0 580 26301 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee
4、 PRI/75, Plastics and rubber films and sheets, upon which the following bodies were represented: British Plastics Federation Her Majestys Stationery Office Institute of Trading Standards Administration Ministry of Defence Packaging and Industrial Films Association PIRA International Amendments issue
5、d since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-3: Method 352F:1996 BSI 10-1998i Contents Page Committees responsible Inside front cover National foreword ii 1Sc
6、ope 1 2Normative references 1 3Definitions 1 4Principle 2 5Apparatus 2 6Test specimens 6 7Procedure 7 8Expression of results 7 9Precision 8 10Test report 8 Annex A (informative) General remarks 9 Annex B (informative) Bibliography 9 Figure 1 Force-deformation diagram for very tough materials (schema
7、tic) 2 Figure 2 Force-deformation diagram for tough materials (schematic) 3 Figure 3 Force-deformation diagram for brittle materials (schematic) 3 Figure 4 Test apparatus (schematic) 4 Figure 5 Clamping device 5 List of references Inside back cover Licensed Copy: London South Bank University, London
8、 South Bank University, Tue Dec 12 08:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-3: Method 352F:1996 ii BSI 10-1998 National foreword This British Standard has been prepared by Technical Committee PRI/75. It is identical with ISO 7765:1994 Plastics film and sheeting Determination of im
9、pact resistance by the free-falling dart method Part 2: Instrumented puncture test, published by the International Organization for Standardization (ISO). BS 2782: Method 352F, together with BS 2782: Method 352E, supersedes BS 2782: Method 352D:1979, which is withdrawn. The Technical Committee has r
10、eviewed the provisions of ISO 291:1977 to which normative reference is made in the text, and has decided that it is acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsi
11、ble for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publications referred toCorresponding British Standard BS 2782 Methods of testing plastics ISO 4593:1993Part 6 Dimensional properties Method 630A:1994 Det
12、ermination of thickness by mechanical scanning of flexible sheet (Identical) ISO 6603-2:1989Part 3 Determination of tensile properties Method 353B:1991 Determination of multi-axial impact behaviour by the instrumented puncture test (Identical) ISO 7765-1:1988Method 352E:1996 Determination of impact
13、resistance by the free-falling dart method (staircase method) (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendmen
14、ts incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-3: Method 352F:1996 BSI 10-19981 1 Scope 1.1 The impact-penetrat
15、ion test described in the two parts of this International Standard is used for the assessment of plastic films and thin sheets (herein-after referred to as films) under an impact stress applied at right angles to the plane of the film. 1.2 Part 1 of this International Standard can be used if it is s
16、ufficient to characterize the impact behaviour of the film by an impact-failure energy. Part 2 is used if a force-deformation or a force-time diagram, recorded at practically constant velocity of the striker, is necessary for characterization of the impact behaviour. This applies if: measured quanti
17、ties derivable only from this diagram are required or only a small number of test specimens are available. 1.3 The test method is applicable to films of up to 1 mm thickness and makes it possible to compare impact-penetration forces, biaxial deformabilities and energy-absorption capacities of films.
18、 Furthermore, if required, the transition region between brittle and tough behaviour of the film under the conditions of testing can be determined by varying the temperature or the penetration velocity or the relative humidity (see also annex B). NOTE 1For thicknesses greater than 1 mm, ISO 6603-2 s
19、hould be used. 1.4 The test results are comparable only if the conditions for preparation of specimens, their thickness and surfaces, and the test conditions are identical. Comprehensive evaluation of the reaction to impact stress requires that the determinations are made as functions of deformation
20、 rate and temperature for different material variables, such as crystallinity and moisture content. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 7765. At the time of publication, the editions indica
21、ted were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 7765 are encouraged 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 Internatio
22、nal Standards. ISO 291:1977, Plastics Standard atmospheres for conditioning and testing. ISO 4593:1993, Plastics Film and sheeting Determination of thickness by mechanical scanning. ISO 6603-2:1989, Plastics Determination of multiaxial impact behaviour of rigid plastics Part 2: Instrumented puncture
23、 test. ISO 7765-1:1988, Plastics film and sheeting Determination of impact resistance by the free-falling dart method Part 1: Staircase methods. 3 Definitions For the purposes of this part of ISO 7765, the following definitions apply. 3.1 peak force, FM the maximum force exerted by the striker in th
24、e direction of impact during the test (see Figure 1 to Figure 3) 3.2 deformation at peak force, sM the deformation in the direction of impact at the centre of the test specimen corresponding to the peak force. For materials exhibiting a peak-force plateau, the deformation is taken at the centre of t
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