疲労破壊じん性と疲労き裂伝ぱ速度表示式

概要

論文の詳細を見る
Fatigue crack growth rate of several high strength steels has been examined in laboratory air at different stress ratio, covering almost entire range of stress intensity, from nearly threshold stress intensity to fatigue fracture toughness K_<fc>. It is cleared that this crack propagation behaviour can be well expressed by four parameter Weibull function. The fatigue characteristic stress intensities, K_e and K_v, are proposed to define the transition behaviour of fatigue crack growth rate, from so called region I to II, and from region II to III, indicating that the maximum stress intensity, K_<max>, is reached to the constant values, K_e and K_v respectively. The correlation between K_<fc>, which is one of the four parameters in the Weibull function, and the other three parameters is also analysed and, hence, the stress ratio dependency of the fatigue crack propagation curve can be predicted successfully.
一般社団法人日本機械学会の論文
1986-08-25