摘要
基于Lamb波在各向异性材料的波动方程和频散原理,采用斜入射法激发A0模态兰姆波。针对板材的铺层角度、各接收点方向和频厚积等因素对衰减规律和传播速度规律有较大影响,采用有限元软件建立玻璃钢复合材料层合板模型,对各影响因素进行数值模拟研究。研究表明:Lamb波传播特性与纤维铺层方式有关,声速及衰减特性沿纤维方向和非纤维方向传播声速和衰减差异较大,并且呈对称现象,频厚积在0.6~1.8 MHz·mm,对传播声速和衰减影响为线性下降且趋于平稳。
Based on the wave equation and dispersion principle of Lamb wave in anisotropic materials,A0 mode Lamb wave is excited by oblique incidence method.The attenuation law and propagation velocity law are greatly affected by the factors such as the ply angle,the direction of each receiving point and the frequency-thickness product of the plate.The model of GFRP composite laminates is established by finite element software,and the influence factors are numerically simulated.The results show that the propagation characteristics of Lamb wave are related to the mode of fiber laying,and the sound velocity and attenuation characteristics vary greatly along the direction of fiber and non-fiber.The frequency-thickness product is between 0.6 MHz mm to 1.8 MHz mm.The influence of Lamb wave on the propagation speed and attenuation decreases linearly and tends to be stable.The most suitable frequency-thickness product range for experiment is obtained.
作者
齐添添
陈尧
何才厚
王海涛
黄丽霞
李秋锋
QI Tiantian;CHEN Yao;HE Caihou;WANG Haitao;HUANG Lixia;LI Qiufeng(Key Laboratory of NDT,Ministry of Education,Nanchang Hangkong University,Nanchang 330063,China;Yintan Branch of Special Equipment Inspection and Research Institute of Jiangxi,Yintan 335000,Jiangxi,China;The Second Architecture Co.,Ltd.,China Construction First Group Corporation,Beijing 100161,China)
出处
《实验室研究与探索》
CAS
北大核心
2020年第3期35-39,44,共6页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(11764030,51865033)
江西省优势科技创新团队建设专项计划项目(20171BCB24008)
江西省教育厅科技项目(GJJ14530,GJJ170577)
江西省质监局科技计划项目(GZJKE201810)。
关键词
玻璃钢复合材料
LAMB波
铺层角度
频厚积
声速
GFRP composites
Lamb wave
layer angle
frequency-thickness product
sound velocity
