Abstract
In this study, we researched rubber O-rings about the relationships between stress relaxation and compression ratio. A prediction method of compression set of O-ring in packages containing radioactive materials using by numerical simulation was investigated in past study. In the lid of the MOX fuel transport packages, the EPDM (Ethylene Propylene Diene Monomer) O-ring was applied to confine the radioactive subset. In order to examine mechanical thermal stress relaxation tests were conducted. The numerical simulation was conducted by the Maxwell type viscoelastic models, elements of which were composed by hyperelastic springs and linear dumpers. As a result, we suggested the stress relaxation model for rubber. And the nonlinear viscoelastic model was applicable to the prediction of the compression sets of EPDM O-ring for the MOX fuel transport packages.
