摘要
针对复合材料加筋结构脱粘损伤问题,提出基于亚谐波共振的加筋板脱粘非线性损伤识别方法。采用界面接触力模型,建立了损伤界面单自由度非线性振动方程,利用多尺度法分析了亚谐波共振的激励条件。以复合材料加筋板结构为实验对象,利用原位压电晶片作动/传感的频响函数,有效确定了非线性损伤的亚谐波激励频率条件,通过响应信号频谱中的亚谐波成分对加筋脱粘损伤进行识别。理论和实验结果表明,利用亚谐波共振方法能够有效地在线检测出复合材料加筋结构的脱粘损伤。
A nonlinear detection method based on subharmonic resonance is proposed in order to solve the debonding damage problem of composite stiffened structures. The single degree of freedom nonlinear vibration equation of the structure with debonding damage is modeled using the interface contact theory, and the multi-scale method has been employed to analyze the excitation conditions of subharmonic resonance. Based on the frequency response function characteristics of in-situ piezoelectric actuator/sensor, the subharmonic excitation frequency condition of nonlinear damage is effectively determined, and the debonding damage of stiffeners is identified by the subharmonic component in the response signal spectrum. It is shown, both theoretically and experimentally, that the subharmonic resonance method can effectively detect the interfacial debonding damage of composite stiffened structures online.
作者
吕鑫豪
叶子航
屈文忠
肖黎
LV Xin-hao;YE Zi-hang;QU Wen-zhong;XIAO Li(Department of Engineering Mechanics,Wuhan University,Wuhan 430072,China)
出处
《强度与环境》
CSCD
2021年第5期8-14,共7页
Structure & Environment Engineering
基金
国家自然科学基金(51975581)。
关键词
复合材料加筋结构
损伤识别
亚谐波共振
多尺度法
频响函数
Composite stiffened structure
Damage detection
Subharmonic resonance
Multi-scale method
Frequency response function
