Growth behavior ofbridged cracks at creep regime

摘要

In this study, the growth behavior ofbridged cracks in the creep regime is investigated numerically. In the analysis, crack growths resulting from the growth of prenucleated creep cavities with diffusionaland dislocation assisted mechanisms are fully accounted for. The bridging elements are assumed to be elastic. The results indicate that the bridging tractions significantly relax even with the creep deformation of the composite alone. A much weaker stress singularity than the ones described by K or C~* occurs ahead of the bridged cracks in the creep regime. In this weak singularity region the cavities grow at comparably high rates to each other.