Experimental study on dynamic observation of acoustic emission source for mesoscopic damage of Q235 steel
Received:July 22, 2018  Revised:September 25, 2018
中文关键词:  声发射源  动态观测  图像分析  细观损伤
英文关键词:acoustic emission source  dynamic observation  image analysis  mesoscopic damage
Author NameAffiliation
ZHANG Ying* Changzhou University, Changzhou 213164, China 
LI Yue Northeast Petroleum University, Daqing 163318, China 
ZHOU Jun-peng Daqing Oilfield Engineering Construction Co.Ltd, Daqing 163318, China 
CHEN Xiao-long Northeast Petroleum University, Daqing 163318, China 
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      The mesoscopic damage process of metal materials is accompanied with the release of transient stress waves, which can be collected by acoustic emission testing technology. However, due to the lack of directly visual means, it is difficult to evaluate the mesoscopic damage of metal materials quantitatively by acoustic emission information. In this work, the SEMtester1000 in-situ tensile testing machine, MZ1000 microscope and PCI-2 acoustic emission detection system are combined to build up an experimental system for acoustic source dynamic observation. Taking the Q235 steel as an example, two typical acoustic emission sources including the slip of the crystals and the fracture of the inclusions are obtained, and the corresponding acoustic emission information is collected. The experimental results show that the slip of the crystals is a continuous process, and the complex slip activity produces multiple types of acoustic emission signals. The fracture of the inclusions is a transient process, which produces typical sudden acoustic emission signals. The comparison between the two sources reveals that the signal energy generated by the fracture of the inclusions is higher. Based on the results of acoustic emission signal analysis and image analysis, a model is established to describe the mesoscopic damage mechanism of the tensile process of Q235 steel.
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