摘要
本文针对先进纤维增强复合材料结构特点及质量检测需求,基于弹性力学和热力耦合相关理论,采用有限元数值方法,在验证模型可靠性的基础上,采用完全热力耦合方法系统开展单层和多层碳纤复合材料板激光超声波传播特性及缺陷识别方法研究,考察了面内缺陷的几何尺寸、层间缺陷的相对位置和深度等因素对激光超声波传播特性及损伤识别结果的影响。结果表明:当复合材料存在面内或层间缺陷时,应力波会在缺陷处发生反射和衍射,具体可表现为出现缺陷反射波信号或透射波信号强度减弱,在已知材料中超声波速情况下结合缺陷异常反射波可实现对相应缺陷的定位。
Aiming at the structural characteristics and quality inspection requirement of advanced fiber-reinforced composite materials and structures, based on elastic mechanics and thermal-mechanical coupling related theories, this work uses finite element simulation to systematically investigate the laser ultrasonic propagation characteristics and defect detection methods of single-layered and multi-layered carbon fiber composite plates after verifying the reliability of the numerical complete thermal-mechanical coupling model. The effects of factors such as the geometric size of the in-plane defects, the relative position, the depth of inter-layer defects, and the interaction of multiple defects on the laser ultrasonic propagation characteristics and the damage identification results are investigated. Results show that the stress waves of the composite materials with in-plane or inter-layer defects will be reflected and diffracted at the defect location, manifesting as a defect-reflected wave appearing in the signal or the intensity of the transmitted wave decreased. The location of the corresponding defect can be identified by combining the abnormal reflection waves of defects when the ultrasonic velocity in materials is known.
作者
付兰凌
杨金水
刘志达
罗浩
FU Lanling;YANG Jinshui;LIU Zhida;LUO Hao(College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China;Qingdao Innovation and Development Base,Harbin Engineering University,Qingdao 266000,China;Center for Composite Materials,Harbin Institute of Technology,Harbin 150001,China;Luoyang Ship Material Research Institute,Luoyang 471023,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2022年第10期1454-1461,共8页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(11802070)
中国科协托举工程项目(2019QNRC001)
国防科工局创新项目(KY10200200040)
黑龙江省自然科学基金项目(YQ2020A001)
中国博士后科学基金特别资助项目(2020T130141)。
关键词
复合材料
损伤检测
无损检测
激光超声
激光激励
热力耦合
数值仿真
composite materials
damage detection
nondestructive examination
laser ultrasonic
laser excitation
thermal-mechanical coupling
numerical simulation
作者简介
通信作者:杨金水,男,副教授,博士生导师,E-mail:yangjinshui@hrbeu.edu.cn.
