Plastics - Determination of multiaxial impact behaviour of rigid plastics - Part 2: Instrumented puncture test (ISO 6603-2:1989)

Kunststoffe - Bestimmung des mehrachsigen Stoßverhaltens von festen Kunststoffen - Teil 2: Instrumentierter Durchstoßversuch (ISO 6603-2:1989)

Dieser Teil von ISO 6603 beschreibt eine Methode zur Bestimmung des mehrachsigenStoßverhaltens von steifen Kunststoffen in Form von flachen Probekörpern wie runden und quadratischen Platten. Diese können direkt gespritzt oder aus gröseren Platten entnommen werden. Die Methode dient zur Charakterisierung von Kunststoffplatten, die mittels eines rechtwinklig zu ihrer Oberfläche auftreffenden Stoßkörpers stoßartig beansprucht werden.

Plastiques - Détermination du comportement des plastiques rigides sous un choc multiaxial - Partie 2: Essai par perforation instrumentée (ISO 6603-2:1989)

Polimerni materiali - Ugotavljanje večosne udarne odpornosti togih polimernih materialov - 2. del: Instrumentalna metoda (ISO 6603-2:1989)

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kunststoffe - Bestimmung des mehrachsigen Stoßverhaltens von festen Kunststoffen - Teil 2: Instrumentierter Durchstoßversuch (ISO 6603-2:1989)Plastiques - Détermination du comportement des plastiques rigides sous un choc multiaxial - Partie 2: Essai par perforation instrumentée (ISO 6603-2:1989)Plastics - Determination of multiaxial impact behaviour of rigid plastics - Part 2: Instrumented puncture test (ISO 6603-2:1989)83.080.01Polimerni materiali na splošnoPlastics in generalICS:Ta slovenski standard je istoveten z:EN ISO 6603-2:1996SIST EN ISO 6603-2:2000en01-maj-2000SIST EN ISO 6603-2:2000SLOVENSKI

SIST EN ISO 6603-2:2000

SIST EN ISO 6603-2:2000

SIST EN ISO 6603-2:2000

INTERNATIONAL STANDARD First edition 1989-12-15 Plastics - Determination of multiaxial impact behaviour of rigid plastics - Part 2 : Instrumented puncture test Plastiques - Dbtermination du comportement des plasfiques rigides sous un choc multiaxial - Par-tie 2 : Essai par perforation instrumentee Reference number IS0 6603-2: 1989(E) SIST EN ISO 6603-2:2000

IS0 6603-2: 1989(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 6603-2 was prepared by Technical Committee ISO/TC 61, Plastics. IS0 6603 consists of the following parts, under the general title Plastics - Determination of multiaxial impact behaviour of rigid plastics: - Part I: Falling dart method - Part 2: Instrumented puncture test Annexes A and B and C and D of this part of IS0 6603 are for information only. 0 IS0 1989 All rights reserved. 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 the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 * Switzerland Printed in Switzerland ii SIST EN ISO 6603-2:2000

INTERNATIONAL STANDARD IS0 6603=2:1989(E) Plastics - Determination of multiaxial impact behaviour of rigid plastics - Part 2 : Instrumented puncture test 1 scope 1.1 This part of IS0 6603 specifies a method for the determination of the multiaxial impact behaviour of rigid plastics in the form of flat test specimens, such as discs and squares, moulded directly or cut from sheets. This test is used for the characterization of plastic sheeting or mouldings under the impact of a striker applied at a right angle to the plane of the sheet. Different test parameters are specified depending on the geometry of the striker. 1.2 IS0 6603-V) can be used if it is sufficient to characterize the impact behaviour of plastics by an impact-failure energy. This part of IS0 6603 is for use if a force-deformation or force-time diagram re- corded at practically constant striker velocity is necessary for characterization of the impact behav- iour. This applies if: - measured quantities derivable only from this di- agram are required; - only a small number of test specimens is avail- able. 1.3 The test method is applicable to test speci- mens with a thickness between 1 mm and 4 mm. NOTE 1 For thicknesses less than 1 mm, IS0 7765-2 should be used. Thicknesses greater than 4 mm may be tested if the equipment is suitable, but the test then falls outside the scope of this part of IS0 6603. 1.4 The test results are comparable only if the conditions of the preparation of the specimens, their dimensions and surfaces as well as the testing con- ditions are the same. In particular, results deter- mined on test specimens of different thicknesses cannot be compared with one another. Comprehen- sive evaluation of the reaction to impact stress re- quires that determinations be made as a function of deformation rate and temperature for different ma- terials variables, such as crystallinity and moisture content. The impact behaviour of finished products cannot be predicted directly from this test, but specimens may be taken from finished products for tests by this method. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 6603. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 6603 are encouraged to investi- gate the possibility of applying the most recent edi- tions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 291:1977, Plastics - Standard atmospheres for conditioning and testing. IS0 293:1986, Plastics - Compression moulding test specimens of thermoplastic materials. 1) IS0 6603-l :1985, Plastics - Determination of muitiaxiai impact behaviour of rigid plastics - Part I: Failing dart method. 1 SIST EN ISO 6603-2:2000

IS0 6603-2:1989(E) IS0 294:1975, Plastics - Injection moulding test NOTES specimens of thermoplastic materials. IS0 2557-2: 1986, Plastics - Amorphous thermoplas- tics - Preparation of test specimens with a specified 2 Examples of force-deformation diagrams for tough and brittle materials are given in figures 1 to 3, with more complex behaviour being described in annex A. reversion - Part 2: Plates. IS0 7765.2:-*), Plastics - Film and sheeting - De- termination of impact resistance by the free-falling- dart method - Part 2: Instrumented puncture test. 3 It is not the purpose of this part of IS0 6603 to give an interpretation of the mechanism occurring on every par- titular point of the force-deformation diagram. These in- terpretations are a task for scientific research. 3 Definitions 5 Apparatus For the purposes of this part of IS0 6603, the follow- ing definitions apply. 3.1 peak force, FP: The maximum force exerted by the striker in the direction of impact during the test (see figures 1, 2 and 3). The apparatus consists of a mechanical part for ap- plying the test force (test device), the instruments for measuring the force and distance, and a thickness gauge. 5.1 Test device 3.2 deformation at peak force, IP: The deformation 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 the plateau (see figures 1 and 2). The essential components of the test device are: the energy carrier (normally a falling mass, but a pneu- matically or hydraulically or spring-assisted driven mass or a pendulum-impact test device may also be used), the striker, and the test specimen support (with a clamping ring, where used). 3.3 energy to peak force, I$,: The area under the force-deformation diagram bounded by the origin, the peak force and the deformation at peak force (see figures 1, 2 and 3). 3.4 total penetration energy, I&: The total energy expended in penetrating the test specimen (see fig- ures 1, 2 and 3). 4 Principle The test device shall permit the test specimen to be punctured at the centre at a nominally constant ve- locity perpendicular to the specimen surface. The force exerted on the test specimen in the direction of impact and the deformation of the specimen in the direction of impact shall be derivable or measurable (see figure 4). Devices suitable for this test are falling-dart machines, pendulums with an arm long enough for the penetration path to be regarded as approximately linear, and high-speed tensile-testing machines with suitable auxiliary attachments. The test specimen is penetrated normal to the plane by a striker at a nominally uniform velocity. The re- sulting force-deformation or force-time diagram is electronically recorded. The test specimen may or may not be clamped in position during the test. The force-deformation diagram obtained in these tests records the behaviour under impact of the specimen from which several features of the behav- iour of the material may be inferred. For example, the fracture may be “brittle”, “ductile”, “tough” or characterized by initial dam- age or by crack initiation and propagation. In addi- tion, dynamic effects may be present such as load cell/indenter resonance, specimen resonance and initial contact/inertia peaks (see annex A). 5.1 .I Energy carrier It shall be ensured that the available impact energy (e.g. drop energy) is large in comparison with the absorbed penetration energy, F,,,. Because, over the range of velocities used in this test, the striker ve- locity has a relatively small influence on the viscoelastic behaviour of plastics, a decrease in striker velocity of 20 % is acceptable. This require- ment is met by falling-dart machines and pendulums .I 340, ma---- . d-0 where In all cases, care must be exercised in analysing these features because the operative mechanism and the trains of inference are not yet fully estab- lished and are the subject of continuing research. m c!T is the falling mass, in kilograms; is the acceleration due to gravity (9,81 m/s*); 2) To be published. 2 SIST EN ISO 6603-2:2000

IS0 6603=2:1989(E) ho is the height of fall, in metres; 4 ot is the total penetration energy, in joules. If a falling-dart system is used, it shall be capable of holding and releasing a weighted striker such that the striker falls constrained by guide(s). The fall shall be largely without friction or losses through windage. Any friction shall be considered in the cal- culations. NOTE 4 In many cases, a weighted striker with a total mass of 20 kg has been found to be sufficient for the larger striker and of 5 kg for the smaller striker (see 5.1.2). Velocity-measuring sensors shall be placed close to the point of impact to compensate for the effects of friction. With hydraulically driven high-speed tensile-testing machines, any deviation of the velocity during im- pact shall be proven, e.g. by recording the distance-time curve and checking its slope. 5.1.2 Striker The preferred striker has a polished hardened hemispherical striking surface of diameter 20 mm + 0,2 mm. Alternatively, a 10 mm zf: 0,l mm diam- eter striking surface may be used. The striker shall be constructed of steel. The load cell on the striker shall be mounted as close as possible to the tip to minimize all extrane- ous forces. An example is shown in figure 4. The resonant frequency of the combination of striker and load cell shall be higher than that specified in 5.2. 5.1.3 Test specimen support A hollow steel cylinder of internal diameter 40 mm & 2 mm and minimum height 12 mm shall be used. The support shall be placed on a solid base and shall be designed such that air cannot be trapped under the test specimen, thus avoiding a possible spring effect. Below the support, enough space shall be available as stopping distance for the striker after total penetration of the test specimen. 5.1.4 Clamping device (optional) A two-piece annular specimen clamp having an in- side diameter of 40 mm + 2 mm is recommended (see figure 5). Pneumatically operated clamps have been successfully employed. If a clamping device is used, ensure that no slippage occurs. NOTE 5 The results for clamped mens are likely to be different. and unclamped speci- 5.2 instruments for measuring force and distance The electronic devices for measuring force and dis- tance shall be chosen such that the force and dis- tance can be measured to within 5 %. EXAMPLE - If the resolution of an electronic device is 0,4 % of full-scale deflection (FSD) and the meas- ured value in a test is 20 % of FSD, then the resol- ution for the test is 2 %.’ Because of the very short time to failure (tr) of the test specimen during the test, only electronic load cells with a high natural frequency shall be used. The shortest failure time tfmin measurable by the apparatus shall be as given ‘by ffpin a 5 f dev where fdev is the natural frequency of the test device (striker plus load cell). For the bandwidth btot of the amplifier train (direct current or carrier frequency amplifier) with a lower bandwidth limit of 0 Hz, the following applies by analogy: where b tot = bj being the bandwidth of thejth component am- plifier. The deformation of the specimen in the direction of penetration can be determined directly with an electronic transducer, thus yielding a force- deformation diagram. It is also possible to use a force-time diagram and calculate the deformation in accordance with clause 8. NOTES 6 An ex ample of such a measurement tr ain is a piezo- load cell mounted between the striker and the shaft (see figure 4) and connected to a charge amplifier. 7 In the testing of very brittle products, elastic impact may cause resonant oscil ations in the load cell and make it difficult to interpret the force-deform ation curve. In this case it can be useful to insert a low-pass filter between the force signal amplifier and the recorder, although accuracy of the measurements is thereby reduced. the If a filter is used, the type of filter and its essential characteristics shall be reported in the test report [see clause 9 e)]. 3 SIST EN ISO 6603-2:2000

IS0 6603=2:1989(E) 5.3 Thickness gauge 6.4 Conditioning of test specimens This shall permit the thickness of test specimens to be measured to within + 0,Ol mm. - The test specimens shall be conditioned as req

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