223 離散転位動力学法による疲労き裂先端近傍での繰返し塑性変形域における転位運動シミュレーション

概要

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The discrete dislocation dynamics (DDD) method is known as a mesoscopic computer simulation procedure which can represent each dislocation movement. In this paper, the 2-dimension DDD simulation was carried out in order to investigate dislocation movement near a fatigue crack tip in bcc iron. Cyclic plastic strain at the crack tip, including compressive one due to the reverse slip during unloading, was obtained and the shape of plastic region was similar to that observed in the grain-oriented 3% silicon iron by an atomic force micro scope. Since cyclic plastic strain is considered to be a primary factor of fatigue damage, DDD approach is valuable method to simulate the fatigue crack propagation.
一般社団法人日本機械学会の論文
2000-07-31