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Numerical study on fatigue damage properties of cavitation erosion for rigid metal materials
作者单位:Guogang Wang~(1,2)) Guang Mal~(1)) Dongbai Sun~(1)) Hongying Yu~(1)) Huimin Meng~(1)) 1)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Power Station Technology Division,China Electric Power Research Institute,Beijing 100070,China
基金项目:国家高技术研究发展计划(863计划),北京市科技攻关项目
摘    要:Cavitation erosion is an especially destructive and complex phenomenon. To understand its basic mechanism, the fatigue process of materials during cavitation erosion was investigated by numerical simulation technology. The loading spectrum used was generated by a spark-discharged electrode. Initiation crack life and true stress amplitude was used to explain the cavitation failure period and damage mechanism. The computational results indicated that the components of different materials exhibited various fatigue lives under the same external conditions. When the groove depth was extended, the initiation crack life decreased rapidly, while the true stress amplitude was increased simultaneously. This gave an important explanation to the accelerating material loss rate during cavitation erosion. However, when the groove depth was fixed and the length varied, the fatigue life became complex, more fluctuant than that happened in depth. The results also indicate that the fatigue effect of cavitation plays an important role in contributing to the formation and propagation of characteristic pits.

关 键 词:疲劳损伤  气蚀  金属材料  强度测试  数字模拟技术
收稿时间:26 June 2007

Numerical study on fatigue damage properties of cavitation erosion for rigid metal materials
Authors:Guogang Wang  Guang Ma  Dongbai Sun  Hongying Yu  Huimin Meng
Affiliation:1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;Power Station Technology Division, China Electric Power Research Institute, Beijing 100070, China
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract:Cavitation erosion is an especially destructive and complex phenomenon. To understand its basic mechanism, the fatigue process of materials during cavitation erosion was investigated by numerical simulation technology. The loading spectrum used was generated by a spark-discharged electrode. Initiation crack life and true stress amplitude was used to explain the cavitation failure period and damage mechanism. The computational results indicated that the components of different materials exhibited various fatigue lives under the same external conditions. When the groove depth was extended, the initiation crack life decreased rapidly, while the true stress amplitude was increased simultaneously. This gave an important explanation to the accelerating material loss rate during cavitation erosion. However, when the groove depth was fixed and the length varied, the fatigue life became complex, more fluctuant than that happened in depth. The results also indicate that the fatigue effect of cavitation plays an important role in contributing to the formation and propagation of characteristic pits.
Keywords:cavitation erosion  microjet  numerical simulation  fatigue analysis  crack initiation  loading spectrum
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