Behavior of stress singularities near the free edge of CFC/TZM bond interface under transient high heat flux loading

A duplex divertor component composed of dissimilar materials experiences considerable thermal stresses under fusion operation conditions, due to the mismatch of the thermal expansion. The stress states near the free edge of the bond interface are very critical because stress intensification occurs and sometimes stress singularities exist. acture mechanical approach can be applied to characterize the behavior of these singular stress fields. A semi-analytical procedure is employed to describe the stress singularity in terms of the stress intensity factor. some of critical fusion operating situations are coupled with the transient thermal flow, it is important to assess the design requirements for transient thermal loads. The applicability of the current approach to a non-harmonic temperature field generated by a transient thermal load is discussed. ress intensity factors are calculated for various transient high heat flux loads. The effect of the temperature gradient at the interface on the stress singularity and on the interfacial stress is investigated quantitatively.