A feasibility study on fatigue damage evaluation using nonlinear Lamb waves with group-velocity mismatching
A feasibility study on fatigue damage evaluation using nonlinear Lamb waves with group-velocity mismatching
复制标题
群速度失配非线性兰姆波疲劳损伤评估的可行性研究
DOI：
10.1016/j.ultras.2018.06.002
复制
发表时间：
2018-11-01
期刊：
影响因子：
4.2
通讯作者：
Xuan, Fu-Zhen
中科院分区：
文献类型：
--
作者：
Zhu, Wujun;Xiang, Yanxun;Xuan, Fu-Zhen
研究了基于群速失配的非线性兰姆波进行疲劳损伤评价的可行性。为了选择有效模态对，提出了基于正态模态分析的兰姆波累积二次谐波产生效率的量化参数。通过实验和仿真验证了所提出的参数，结果表明，无论是否满足群速度匹配条件，对于所研究的5种低阶Lamb波，累积SHG效率都随着Lamb模式的阶数增加而增加。然后，采用群速度失配的S3-s6模对来表征铝合金的疲劳损伤，从而实现高效的累积SHG。结果表明，S3-s6模态对疲劳损伤演化非常敏感，二次谐波的综合幅值随疲劳循环次数的增加而增加近300%。验证了群速度不匹配的非线性Lamb波是有效评估疲劳损伤的候选波。
The feasibility of fatigue damage evaluation has been investigated using nonlinear Lamb waves with group-velocity mismatching. To choose an efficient mode pair, a parameter is proposed to quantify the efficiency of cumulative second-harmonic generation (SHG) of Lamb waves based on the normal modal analysis. Experiments and simulations are performed to verify the proposed parameter, which demonstrates that whether the matching condition of group velocity is satisfied or not, the efficiency of cumulative SHG increases with the order of Lamb mode for the five low-order Lamb waves investigated. Then, S3-s6 mode pair with group-velocity mismatching is chosen to characterize the fatigue damage of an aluminium alloy for the high efficiency of cumulative SHG. Results show that S3-s6 mode pair is sensitive to fatigue damage evolution and the integrated amplitude of second harmonics increases by nearly 300% with fatigue cycles. Nonlinear Lamb waves with group-velocity mismatching are validated to be a candidate to efficiently evaluate the fatigue damage.