Modelling of Fast Crack Propagation and Arrest in Ship Steels

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概要

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• A fracture mechanics model for fast crack propagation and arrest is proposed based on the local fracture stress criterion. Dynamic fracture toughness (K_D) for a propagating crack is calculated as a function of crack velocity and temperature. The model is extended to incorporate the effect of unbroken ligament (UL) formed near the plate surfaces and crack-front-tunneling. The model simulates acceleration, deceleration and arrest of a crack in a ESSO or a double-tension test plate with temperature-gradient. Calculated arrested crack lengths compare well with experimental results. It is shown that the conventional crack arrest toughness calculated from applied stress and arrested crack length depends on temperature-gradient and the toughness is not a unique material property.

• 財団法人日本海事協会の論文

著者

• Machida Susumu

  Department Of Naval Architecture And Ocean Engineering University Of Tokyo

• Aihara Shuji

  Nagoya R & D Laboratories Nippon Steel Corpoartion

• Yoshinari Hitoshi

  Department of Naval Architecture and Ocean Engineering, University of Tokyo

• Yoshinari Hitoshi

  Department Of Naval Architecture And Ocean Engineering University Of Tokyo

関連論文

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• 16. Study on Brittle Crack Propagation and Arrest Behavior in Plate and Beam Structures
• Modelling of Fast Crack Propagation and Arrest in Ship Steels

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