陕西师范大学学报（自然科学版）2024，Vol.52Issue(2)：35-42,8.DOI:10.15983/j.cnki.jsnu.2024307
零群速度特征导波在焊缝损伤评估中的应用
Application of zero-group-velocity feature guided waves in welded joints damage assessment
摘要
Abstract
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.关键词
零群速度/特征导波/焊缝结构/共振/材料损伤Key words
zero-group-velocity/feature guided waves/welded joints/resonance/material damage分类
数理科学引用本文复制引用
任猛,孟祥迪,邓明晰..零群速度特征导波在焊缝损伤评估中的应用[J].陕西师范大学学报（自然科学版）,2024,52(2):35-42,8.基金项目
国家自然科学基金(12134002) （12134002）
