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利用全波形声发射技术记录了30 CrMnSi高强度合金钢在三点弯曲载荷下整个破坏过程的声发射信号。在研究了声发射累计振铃计数随载荷变化的基础上,得出裂纹的发展过程大致可分为三个阶段。采用参数分析法和频谱分析法对裂纹发展的三个阶段声发射信号进行了统计和分析,得出声发射信号频率的升高和幅值的增加是构件逐渐破坏的特征。
The acoustic emission signals of 30 CrMnSi high strength alloy steel during the whole failure process under three-point bending load were recorded by full-wave acoustic emission technique. Based on the study of the accumulated ringing counts of acoustic emission with the change of load, it is concluded that the development of crack can be divided into three stages. The parametric analysis and spectrum analysis were used to analyze and analyze the acoustic emission signals in the three stages of crack development. It was found that the increase of the acoustic emission signal frequency and the increase of the amplitude were the characteristics of the gradual destruction of the components.