工程科学学报2015，Vol.37Issue(12)：1588-1593,6.DOI:10.13374/j.issn2095-9389.2015.12.009
Q345R疲劳裂纹扩展过程的声发射研究
Acoustic emission study of fatigue crack propagation in Q345R
摘要
Abstract
The acoustic emission signals of fatigue crack propagation in Q345R, which is the typical representative of common steel for pressure vessels, were investigated in detail to construct a relationship between fatigue and acoustic emission. The results show that there are three distinct stages of acoustic emission during fatigue crack propagation in Q345R. Cumulative count and cumula-tive energy can characterize the whole fatigue crack propagation well. The transition from the 2nd stage to the 3rd stage of acoustic e-mission advances that of linear elastic fracture mechanics, indicating that acoustic emission is more sensitive to the unstable fracture stage of fatigue crack propagation. The relations of count rate and energy rate to fatigue crack propagation rate of Q345R are estab-lished respectively for predicting the remaining life of Q345R.关键词
低合金钢/疲劳裂纹扩展/声发射/压力容器/监测Key words
low alloyed steel/fatigue crack propagation/acoustic emission/pressure vessels/monitoring分类
金属材料引用本文复制引用
柴孟瑜,段权,张早校..Q345R疲劳裂纹扩展过程的声发射研究[J].工程科学学报,2015,37(12):1588-1593,6.基金项目
国家科技重大专项课题资助项目(2011ZX06004-009) （2011ZX06004-009）
