1、 IEC TR 61244-4 Edition 1.0 2019-09 TECHNICAL REPORT Determination of long-term radiation ageing in polymers Part 4:Effects of different temperatures and dose rates under radiation conditions IEC TR 61244-4:2019-09(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2019 IEC,Geneva,Switzerland All
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9、 clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC TR 61244-4 Edition 1.0 2019-09 TECHNICAL REPORT Determination of long-term radiation ageing in polymers Part 4:Effects of different temperatures and dose rates un
10、der radiation conditions INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 17.240;29.035.01 ISBN 978-2-8322-7429-3 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC TR 61244-4:2019 IEC 2019 CONT
11、ENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms,definitions and abbreviated terms.6 3.1 Terms and definitions.6 3.2 Abbreviated terms.7 4 Radiation induced degradation mechanisms at standard ambient conditions.8 4.1 General conventions.8 4.2 Effect of presence of oxygen.9 4
12、.3 Effect of dose-rate effect-1:Physical aspects.9 4.4 Effect of dose-rate-2:Chemical aspects.10 4.5 Research on degradation mechanism.10 4.6 Experiences and acceleration factors.11 4.7 Low dose-rate tests and LOCA survivability.11 4.8 Effect of LOCA test environment.11 4.9 Order effects,synergistic
13、 effects,and antagonistic effects.12 4.10 Sequential test conditions equivalent to simultaneous methods.12 4.11 Studies after TMI and later.13 4.12 Arrhenius law and limitations.13 4.13 Slow degradation behaviour observed in service-aged cables.16 4.14 Inverse temperature effects.17 4.15 Role of ant
14、ioxidants.17 4.16 Other thermal and radiation environment degradation characteristics.18 5 Accelerated ageing test methods.18 5.1 Sequential ageing test.18 5.1.1 General.18 5.1.2 Sequence of testing and synergistic effects.19 5.1.3 Guidance on test sequences.20 5.1.4 Assessment of accelerated ageing
15、.20 5.2 Simultaneous ageing test.21 6 Conclusion.22 Bibliography.23 Table 1 Dose rate conditions which do not cause inhomogeneous degradation.10 Table 2 Ea value according to materials,manufacturers,and grades.14 Table 3 Changes in various properties due to inverse temperature and annealing recovery
16、 effects,investigated by several instrumental analyses 111.17 Table 4 Typical standard acceleration ageing sequence for qualification.19 Table 5 More recent standard acceleration ageing sequence for qualification.19 IEC TR 61244-4:2019 IEC 2019 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DETERMINATION OF LONG-TERM RADIATION AGEING IN POLYMERS Part 4:Effects of different temperatures and dose rates under radiation conditions FOREWORD 1)The International Electrotechnical Commission(IEC)is a worl
