多晶体金属疲劳寿命随晶粒尺寸变化的理论研究  

The relationship between fatigue life and grain size of polycrystalline metals

作　　者：李眉娟[1] 胡海云[1] 邢修三[1] 

机构地区：[1]北京理工大学应用物理系,北京100081

出　　处：《物理学报》2003年第8期2092-2095,共4页Acta Physica Sinica

摘　　要：在疲劳断裂非平衡统计理论框架的基础上 ,根据界面能模型 ,推导出了多晶体金属的疲劳寿命随晶粒尺寸、应变振幅的变化公式 .还与有关实验结果进行了比较 ,发现理论与实验较为相符 .In order to explore the effect of grain size on fatigue life, a formula of fatigue life for polycrystalline metals I which depends on the grain size and cyclic strain amplitude, is derived based on the non-equilibrium statistical theory of fatigue fracture and the model of interface energy. Subsequently, the fatigue lifes of pure copper and 70-30 brass with different grain sizes are calculated according to the formula which is achieved in this paper, and the results are in agreement with the experimental results.

关 键 词：多晶体金属 疲劳寿命 晶粒尺寸 疲劳断裂 非平衡统计理论 界面能模型 应变振幅 

分 类 号：TG113.255[金属学及工艺—物理冶金]