我国在飞机寿命问题上,有按疲劳处理的,也有按断裂力学处理的,办法不一。在贯彻中共中央关于召开全国科学大会通知的精神,抓紧搞好规划的时刻,弄清疲劳和断裂的关系以及安全寿命和损伤容限的概念是很有必要的。本文中提出用断裂控制设计来代替疲劳寿命的设想,是否适合我国当前情况,能否“多快好省”,请同志们讨论指正。一、疲劳和断裂的意义 China’s life on the plane, there are according to the fatigue treatment, but also according to the mechanics of fracture treatment, different approaches. In carrying out the spirit of the CPC Central Committee’s circular on convening a National Science Conference, it is necessary to grasp the moment when planning well and understand the relationship between fatigue and fracture as well as the concept of safety life and damage tolerance. In this paper, we put forward the idea of ​​replacing the fatigue life with the design of the fracture control, which is suitable for the current situation in our country and whether we can “make the province more prosperous and better”, and ask the comrades to discuss and correct it. First, the meaning of fatigue and fracture