BS 7816-2:1997
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Determination of long-term radiation ageing in polymers Procedures for predicting ageing at low dose rates
Hardcopy , PDF
English
15-03-1997
31-08-2014
Committees responsible
National foreword
Introduction
1 General
2 Power law extrapolation method
3 Superposition of time dependent data
4 Superposition of DED data
5 Conclusions
Annex
A (informative) Bibliography
Figures
1 Schematic illustrating the types of dose rate effects
which can occur in radiation-aged polymeric materials
2 Interpolation of the end-point dose - Schematic
3 Extrapolation of end-point dose to lower dose rates -
Schematic
4a Limitations - Extrapolation of DED near thermal ageing
limit
4b Limitations - Extrapolation of DED in a polymer with
type III behaviour
5 Elongation at break of polypropylene irradiated in
air (from [7])
6 Extrapolation of end-point dose from data in figure 5
7 Extrapolation of end-point dose from XLPE (from [7])
8 Example where extrapolation of end-point dose is not
feasible
9 Schematic - Superposition principle for thermal ageing
and combined thermal-radiation ageing
10a Determining shift factors b(T) for thermal ageing
10b Superposition of data to yield master curve
11 Determination of activation energy E
12 Determination of shift factors a(T,D) for combined
thermal-radiation ageing
13 Fitting experimental values of a(T,D) to the empirical
model-equation (3)
14 Calculated DED using equation (3)
15 Experimental data for EPDM elastomer fitted to the
superposition model
16 Calculated DED for 50% compression set
17 Calculated DED for 50% compression set
18 Calculated DED for e/eo = 0,5
19 DED values under combined thermal-radiation conditions -
Schematic
20 Superposition of DED data - Schematic
21 Superposition of DED for Hypalon cable jacket material -
(O - heterogeneous oxidation, - homogeneous oxidation
22 Superposition of DED for Hypalon cable jacket material -
Homogeneous oxidation data only
23 Superposition of DED data for PVC showing type III
behaviour - Homogeneous oxidation data only
Three methods which have been used to extrapolate data obtained from high dose rate experiments to low dose rates typical of service conditions.
| Committee |
GEL/15
|
| DevelopmentNote |
Supersedes 94/212330 DC (10/2005)
|
| DocumentType |
Standard
|
| Pages |
28
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| IEC 60544-4:2003 | Electrical insulating materials - Determination of the effects of ionizing radiation - Part 4: Classification system for service in radiation environments |
| IEC 60544-1:2013 | Electrical insulating materials - Determination of the effects of ionizing radiation - Part 1: Radiation interaction and dosimetry |
| IEC 60544-2:2012 | Electrical insulating materials - Determination of the effects of ionizing radiation on insulating materials - Part 2: Procedures for irradiation and test |
| IEC TS 61244-1:2014 | Determination of long-term radiation ageing in polymers - Part 1: Techniques for monitoring diffusion-limited oxidation |
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