通过数值模拟方法研究了零群速度特征导波(zero-group-velocity feature guided waves,ZGV-FGWs)在焊缝损伤检测中的应用.建立了焊缝结构的二维频域有限元模型,损伤程度用不同的杨氏模量表征,验证了焊缝结构中的共振现象并确定了能量集中在焊缝特征区附近时的共振频率.利用三维时域有限元方法确定了ZGV-FGWs共振模式的存在,并分析了不同杨氏模量焊缝的ZGV-FGWs传播特性.结果表明:随着材料杨氏模量的减小,ZGV-FGWs频谱信号幅值显著单调减小,且ZGV-FGWs频谱信号幅值的变化趋势与激励信号的频谱曲线吻合.基于此特性可以设置合适的激励信号,获得幅值变化更强的ZGV-FGWs频谱信号,进而准确评价焊缝的损伤状态.
The application of zero-group-velocity feature guided waves(ZGV-FGWs)in welded joints damage detection is investigated by numerical simulation.The two-dimensional(2D)frequency-domain finite element(FE)model of a welded joint is established with different levels of damage represented by varying its Young's modulus.The resonance phenomenon in the welded joint is verified and the resonance frequency is identified when the energy is concentrated near the feature region of the welded joint.The existence of ZGV-FGWs resonance is determined by three-dimensional(3D)time domain FE method,and the propagation characteristics of ZGV-FGWs in the welded joint with different Young's modulus are analyzed.The results show that the amplitude of the ZGV-FGWs spectrum signals significantly decreases monotonically with the decrease of Young's modulus,and the variation trend of spectrum amplitude at the ZGV-FGWs'frequencies with different Young's modulus coincides with the spectral curve of the excitation signal.Based on this characteristic,suitable excitation signals can be set to obtain ZGV-FGWs spectrum signals with more significant amplitude changes,thereby accurately evaluating the damage levels of welded joints.
任猛;孟祥迪;邓明晰
重庆大学航空航天学院,重庆 400044
物理学
零群速度;特征导波;焊缝结构;共振;材料损伤
zero-group-velocity;feature guided waves;welded joints;resonance;material damage
《陕西师范大学学报（自然科学版）》 2024 (002)
35-42 / 8
国家自然科学基金(12134002)
10.15983/j.cnki.jsnu.2024307
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