111 熱活性破壊における平均寿命とバーストサイズ(OS1.固体物理/流体物理のマルチフィジックス/マルチスケール解析(3),オーガナイズドセッション)

概要

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Subcritical rupture is one of the fracture phenomena, which occurs under a constant load below the fracture strength of materials. This fracture is of fundamental importance in a wide range of physical, biological, and geological systems, and has an enormous technological impact. We study subcritical fracture driven by thermally activated damage accumulation in the framework of fiber bundle models. We show that, in the presence of stress inhomogeneities, thermally activated cracking results in an anomalous size effect. We propose a modified form of the Arrhenius law which provides a comprehensive description of thermally activated breakdown. Thermal fluctuation triggers bursts of breakings which have a power law size distribution.
2009-10-10