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BSI PD IEC/TS 61244-2:2014

BSI PD IEC/TS 61244-2:2014

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Determination of long-term radiation ageing in polymers – Procedures for predicting ageing at low dose rates

Published By Publication Date Number of Pages
BSI 2014 34
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This part of IEC TS 61244, which is a technical specification, applies to procedures for predicting ageing of polymeric materials at low dose rates.

The object is to present three methods which can be used to extrapolate data obtained fromhigh dose rate experiments to the low dose rates typical of service conditions. These methods assume that homogeneous oxidation has been achieved under the test conditions. The techniques described in the following clauses are methods which have been found to be useful for a range of elastomeric, thermoplastic and thermoset materials. The procedures require a considerable number of test data to enable predictions to be made under low dose rate conditions.

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PDF Pages PDF Title
4 English

CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
3 General
9 4 Power law extrapolation method
4.1 Description
4.2 Test procedure
4.3 Determination of model parameters
10 4.4 Limitations
Figures

Figure 1 – Interpolation of the end-point dose (schematic), showing a plot of relative elongation at break plotted vs dose with interpolation of DED values at 0,75 and 0,5
Figure 2 – Extrapolation of end-point dose to lower dose rates (schematic) showing the plot of DED values vs dose rate
11 5 Superposition of time dependent data
5.1 Description
5.2 Test procedure
Figure 3 – Limitations – Extrapolation of DED near thermal ageing limit (schematic)
12 5.3 Determination of model parameters
Figure 4 – Determining shift factors a (T,0) for thermal ageing
13 Figure 5 – Superposition of data to yield master curve
Figure 6 – Determination of activation energy E
14 Figure 7 – Determination of shift factors a (T, D
) for combined thermal-radiation ageing, relative to the master curve in Figure 4
15 5.4 Limitations
Figure 8 – Fitting experimental values of a (T, D
) to the empirical model Equation (2)
Figure 9 – Calculated DED using Equation (5)
16 6 Superposition of DED data
6.1 Description
6.2 Test procedure
6.3 Evaluation
17 6.4 Limitations
Figure 10 – DED values under combined thermal-radiation conditions (schematic)
Figure 11 – Superposition of DED data (schematic)
19 Annex A (informative) Behaviour of polymeric materials in radiation environments
20 Figure A.1 – Schematic illustrating the types of dose rate effects which can occur in radiation aged polymeric materials
21 Annex B (informative) Examples of use of the power law method
B.1 General
B.2 Polypropylene filaments
B.3 Crosslinked polyethylene (XLPE)
Figure B.1 – Elongation at break of polypropylene irradiated in air (from [10])
22 Figure B.2 – Extrapolation of end-point dose from data in Figure B.1
Figure B.3 – Dose required to reach 100 % elongation at 20 °C for an XLPE cable insulation material [11]
23 Annex C (informative) Use of the superposition principle
Figure C.1 – Schematic – Superposition principle for thermal ageing
24 Figure C.2 – Schematic – Superposition principle for combined thermal-radiation ageing
25 Annex D (informative) Examples of use of the superposition of time dependent data
D.1 Ethylene propylene (EPDM) elastomer
D.2 Nitrile elastomer
D.3 Ethylene vinyl acetate (EVA) polymer
26 Figure D.1 – Experimental data for EPDM elastomer fitted to the superposition model
Figure D.2 – Calculated DED for 50 % compression set at 20 °C
27 Figure D.3 – Calculated DED for 50 % compression set at 40 °C
Figure D.4 – Calculated DED for e/e0 = 0,5
28 Annex E (informative) Examples of use of the superposition of dose to equivalent damage (DED) data
E.1 General
E.2 Neoprene cable jacket
E.3 Chlorosulphonated polyethylene (CSPE) cable jacket
E.4 Crosslinked polyolefin (XLPO) cable insulation
E.5 Poly vinyl chloride (PVC) cable jacket
29 Figure E.1 – Superposition of DED data at 50 °C for a neoprene cable jacket material [7]
30 Figure E.2 – Superposition of DED data for several different CSPE cable jacket materials
31 Figure E.3 – Superposition of DED data for a XLPO cable insulation material [7]
Figure E.4 – Superposition of DED data for PVC showing complex dose rate dependence – Homogeneous oxidation data only
32 Bibliography

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BSI PD IEC/TS 61244-2:2014
$167.15