摘要
针对碳纤维复合材料板低能量冲击损伤的线性超声响应特征很弱、难以用于检测该类损伤的问题,提出碳纤维复合材料层板低能量冲击损伤的非线性兰姆波成像检测技术。搭建检测平台并制备冲击损伤程度各异的检测试样;分析碳纤维增强树脂基复合材料层板中兰姆波的各向异性传播特性和模态结构,激发满足非线性超声检测要求的兰姆波模态,并分析相对非线性系数对低能冲击损伤的表征能力;提出基于损伤因子的非线性超声兰姆波成像算法和成像扫描方法,并通过优化成像算法提高成像效果。研究结果表明,相对非线性系数对低能量冲击损伤有很高的检测灵敏度,基于损伤因子的非线性Lamb波成像方法可实现对复合材料低能冲击损伤的直观成像检测。
A nonlinear Lamb wave imaging detection method is proposed to solve the problem that the linear ultrasonic response characteristics of low-energy impact damage of carbon fiber reinforced polymer(CFRP)laminates are very weak and difficult to be used for damage’s detection.The testing platform is constructed,and the test samples with different impact damage are prepared.The anisotropic propagation characteristics and modal structure of the Lamb wave in the CFRP laminates are analyzed to excite the mode that meets the detection requirements,moreover,the characterization ability of relatively nonlinear coefficients on low-energy impact damage are investigated.The scanning method for imagery is proposed,and the imaging algorithm based on the damage index is optimized to enhance the imaging effect.The research results indicated that the relative non-linear coefficient has high detection sensitivity for low-energy impact damage in CFRP laminates,and the intuitive imaging detection of low-energy impact damage of CFRP laminates can be achieved by the nonlinear Lamb wave imaging method based on damage index.
作者
许国琛
陈振华
李承庚
卢超
XU Guochen;CHEN Zhenhua;LI Chenggeng;LU Chao(Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330063;State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;School of Physics and Electronic Information,Gannan Normal University,Ganzhou 341000)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2023年第10期40-47,共8页
Journal of Mechanical Engineering
基金
江西省自然科学基金(20202BABL201023)
场声信息国家重点实验室开放课题(SKLA201811)资助项目。
