Study for the prediction of the long-term durability of seismic isolators
- Univ. of Tokyo (Japan)
The application of seismic rubber isolators is considered as one of the steps in assuring the reliability and safe operation of the Fast Breeder Reactor Plant. In order to propose a precise test method for estimating the durability of seismic isolators, we examined the depth-dependent profiles of tensile properties in thick natural rubber blocks after thermal aging at 60-100[degrees]C. The results of this study established the following conclusions: After thermal aging, the rubber blocks exhibited heterogeneous degradation behavior. These rubber blocks could be divided into two areas, the oxidative degraded area near the surface showing large changes in the properties, and the thermal degraded area in the interior showing small property changes. It was established that the depth of oxidation showed temperature dependence, with greater depth of oxidation at lower temperatures. There was also found to be a linear relationship between the logarithm of the depth of oxidation and the reciprocal of the absolute temperature. As a result, the depths of oxidation at normal temperature may be estimated to depths of 6-10 cm. Having calculated the activation energy at depths of 2 mm each from the surface in the oxidative degraded area, it was found that the activation energy held a fixed value independent of depth. 7 refs., 6 figs., 2 tabs.
- OSTI ID:
- 6614800
- Journal Information:
- Rubber World; (United States), Vol. 211:3; ISSN 0035-9572
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
42 ENGINEERING
36 MATERIALS SCIENCE
FBR TYPE REACTORS
RELIABILITY
SEISMIC EFFECTS
NATURAL RUBBER
ELONGATION
OXIDATION
TENSILE PROPERTIES
THERMAL DEGRADATION
ACTIVATION ENERGY
DEPTH
EXPERIMENTAL DATA
MATERIALS TESTING
BREEDER REACTORS
CHEMICAL REACTIONS
DATA
DIMENSIONS
ELASTOMERS
ENERGY
EPITHERMAL REACTORS
FAST REACTORS
INFORMATION
MECHANICAL PROPERTIES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
REACTORS
RUBBERS
TESTING
220900* - Nuclear Reactor Technology- Reactor Safety
210500 - Power Reactors
Breeding
420500 - Engineering- Materials Testing
360603 - Materials- Properties
360604 - Materials- Corrosion
Erosion
& Degradation