微小疲労き裂伝ぱの支配力学パラメータに関する検討

概要

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Short fatigue crack growth tests under a large variety of stress amplitude values with 0.15 %C steel and Ti-6Al-4V alloy were carried out to study the validity of the previously proposed correlating mechanics parameters of the short crack growth. The cyclic .J integral range which correlated the growth of both short and long cracks under both small and large scale yielding conditions was the best parameter. The parameter σ^m_a・2b (σ_a; stress amplitude, n≅8, 2b; surface crack length) correlated the growth of short cracks under large scale yielding. Effective range of the stress intensity correlated the growth of shorter cracks under larger stress amplitude values than the stress intensity range. Stress intensity range for the effective crack length correlated the growth of both short and long cracks independent of the yielding conditons, when the crack growth rate was small.
宇部工業高等専門学校の論文