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为开展声发射技术应用于铸铁承压设备检测的应用研究,首先应研究铸铁材料拉伸过程的声发射特征,然后获取铸铁构件上典型裂纹扩展的声发射信号,找到铸铁构件开裂所特有的声发射信号特征,为活性缺陷的正确检测和识别奠定基础。因此,本文首先研究了灰口铸铁HT200材料拉伸试件的声发射特性,然后在报废的造纸烘缸上预制了表面裂纹,采用水压循环加载的方式,用声发射监测其加载试验过程的声发射现象,获取缸体表面裂纹扩展的声学信号样本,确定了随载荷变化,裂纹缺陷扩展的声发射参数特征和定位特征,其结果为后续波形信号的特征提取和模式识别研究提供了典型声发射源信号数据,也为铸铁类构件的声发射检测提供了参考。
In order to study the application of acoustic emission technology in the testing of cast iron pressure equipment, the acoustic emission characteristics of cast iron material during tensioning process should be researched. Then, the acoustic emission signals of typical crack propagation on cast iron components should be obtained. Launch the signal characteristic, lay the foundation for the correct detection and identification of active defects. Therefore, in this paper, the acoustic emission characteristics of gray cast iron HT200 tensile specimens were studied firstly, then the surface cracks were prefabricated on the scrapped paper-making dryers, and the cyclic loading was used to monitor the loading process by acoustic emission Acoustic emission was obtained to obtain the acoustic signal samples of the crack propagation on the cylinder surface. The acoustic emission parameters and the localization characteristics were determined with the changes of the load and the propagation of the crack defects. The results provided typical acoustic characteristics for subsequent waveform signal extraction and pattern recognition Emission source signal data, but also for the cast iron components of acoustic emission detection provides a reference.