Non-linear ultrasonic technique to assess fatigue damage in structural steel
Non-linear ultrasonic technique to assess fatigue damage in structural steel
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DOI：
10.1016/j.scriptamat.2006.03.037
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发表时间：
2006-07
影响因子：
6
通讯作者：
S. P. Sagar;Das Saumya;N. Parida;D. Bhattacharya
中科院分区：
文献类型：
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作者：
S. P. Sagar;Das Saumya;N. Parida;D. Bhattacharya
采用非线性超声技术对低碳结构钢进行了疲劳损伤评价。本文引入了总谐波失真百分比，即二次谐波幅值与基波幅值之比作为测量参数。还观察到，在裂纹萌生之前，二次谐波振幅与基波相当。根据位错理论对材料降解过程中的谐波产生进行了分析。
A non-linear ultrasonic technique has been used to assess the fatigue damage in low carbon structural steel. The percentage of total harmonic distortion, which is the ratio of the amplitude of 2nd harmonic and the fundamental, has been introduced as the measurement parameter in this paper. It has also been observed that before crack initiation the 2nd harmonic amplitude is comparable to the fundamental. The results have been analysed in light of the dislocation theory for harmonic generation during material degradation.