给出了交变加载（疲劳）断裂韧性指标K_（IF）和断裂的疲劳次数（疲劳寿命）N_f的表达式。

The results are analyzed and on equation between fatigue fracture toughness K_(IF) and fatigue life N_f is formulated in this paper.

youdao

给出了交变加载（疲劳）断裂韧性指标K_（IF）和断裂的疲劳次数（疲劳寿命）N_f的表达式。

The results are analyzed and on equation between fatigue fracture toughness K_(IF) and fatigue life N_f is formulated in this paper.

youdao