摘要
CFRP层板中不可见冲击损伤的线性超声响应特征很弱,由此提出CFRP层板中低能量冲击损伤的非线性超声Lamb波检测方法。首先搭建非线性超声Lamb波检测平台,提出Lamb波激发方法并分析其模态构成,其次判定各模态是否满足非线性超声Lamb波检测条件,最后分析线性及非线性超声检测特征对损伤的敏感程度,提出检测不可见冲击损伤的非线性特征参数。研究结果表明,相对非线性系数对3、5 J低能量不可见冲击损伤具有较高的检测灵敏度,能够用于该类损伤的无损检测。
As the characteristics of linear ultrasonic response to the invisible impact damage in carbon fiber reinforced polymer(CFRP)composite laminate are so weak,a nonlinear ultrasonic Lamb wave detection method for determining the low-energy impact damage in the CFRP laminate is proposed.First of all,build a platform for nonlinear ultrasonic Lamb wave detection,propose a means for Lamb wave excitation and analyze its modal composition.Secondly,determine whether each model meets the testing conditions required by the nonlinear ultrasonic Lamb wave detection method.Finally,analyze the sensitivity of linear and nonlinear ultrasonic detection characteristics to the damage,and propose the nonlinear feature parameters for detecting invisible impact damage..The research results show that the relatively nonlinear coefficient is highly sensitive to the low-energy(3 J and 5 J)invisible impact damage,which can be applied in non-destructive detection of this kind of damage.
作者
李承庚
陈振华
陈伟兵
卢超
LI Cheng-geng;CHEN Zhen-hua;CHEN Wei-bin;LU Chao(Key Laboratory of Nondestructive Testing(Nanchang Hangkong University),Ministry of Education,Nanchang 330063,China;State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;Gannan Normal University,Jiangxi Ganzhou 341000,China)
出处
《失效分析与预防》
2021年第2期83-88,97,共7页
Failure Analysis and Prevention
基金
国家自然科学基金项目(11664027)
声场声信息国家重点实验室开放课题(SKLA201811)。
