混凝土材料声发射信号的频率特征及其与强度参量的相关性试验研究

Experimental studies on the frequency characteristics of acoustic emissions in concrete material and its dependences on strength parameters

混凝土材料声发射信号频率特征与强度指标的关系是混凝土材料声发射检测技术的重要基础。通过实验,对声发射信号频率特征与混凝土强度指标的相关关系进行了探讨。研究结果表明,在较低的应力水平上,不同强度等级混凝土声发射信号大都是低频信号。而在较高应力水平时,随着强度等级的增加,声发射信号的优势频率则逐渐升高。

The correlation between frequency characteristics of acoustic emission signals and strength parameters in concrete materials is important for acoustic emission testing techniques.Through experiments,we studied the correlations between frequency characteristics of acoustic emission signals and strength parameters.The results show that the acoustic emission signals in the concretes at different strength levels usually have low-frequency signal components at low stress levels,while at the higher stress levels,the dominant frequency components of the acoustic emission signals increase gradually with the stress strength level increasing.