论文部分内容阅读
一、声发射技术的原理声发射检测过程可归纳为:从声发射源发出的信号经介质传播后到达换能器,由换能器接收、转换并输出电信号,然后进行放大、滤波、计数、记录,最后根据得到的信息对声发射源(被测试件)作出解释。声发射的产生是材料中局部区域快速卸载使弹性能得到释放的结果。当材料受力后,由于在内部各种结构缺陷附近区域和结构不均匀区域产生应力集中,使这些局部区域贮存较高的弹性应变能,而系统总是自动趋于
First, the principle of acoustic emission technology Acoustic emission detection process can be summarized as follows: the signal emitted by the acoustic emission source reaches the transducer after propagation through the medium, the transducer receives, converts and outputs the electrical signal, and then performs amplification, filtering, counting , recording, and finally based on the information obtained to explain the acoustic emission source (tested). The generation of acoustic emissions is the result of the rapid unloading of local areas of the material to release the elastic energy. When the material is stressed, due to the stress concentration in the areas near the internal structural defects and the structural non-uniform areas, these local areas store high elastic strain energy, and the system always tends to automatically