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一、前言近年来线弹性断裂力学方法得到了很快的发展,开始广泛应用于工程上,成为一种保证结构可靠性的有效工程方法。在我国亦开始用于发电设备中,如发电机转子、汽轮机转子、汽轮机叶轮、燃气轮机叶轮、发电机护环等等。它们都是重数十吨的高速旋转机械,如果发生断裂,其后果是非常严重的:除了直接造成的损失以外,还影响发电量。但是我国当前社会主义建设又急需大量电能,并要求节约钢材,因此必须最大限度利用每一个发电设备,利
I. INTRODUCTION In recent years, the linear elastic fracture mechanics method has been rapidly developed and started to be widely used in engineering as an effective engineering method to ensure the structural reliability. In our country also started to be used in power generation equipment, such as generator rotor, steam turbine rotor, turbine impeller, gas turbine impeller, generator retaining ring and so on. They are all high-speed rotating machines weighing tens of tons. In the event of a fracture, the consequences are very serious: In addition to the direct losses, they also affect the amount of power generated. However, the current socialist construction in our country urgently needs a lot of power and requires steel saving. Therefore, it is necessary to make maximum use of every power generation equipment,