黏接界面脱黏损伤的缺陷局部内共振识别方法

Debonding damage recognition of bonding interface based on local internal resonance of defects

黏接结构的界面脱黏将导致结构完整性的破坏,对界面黏接状态进行有效的检测和评估具有重要意义。提出一种基于缺陷局部内共振的界面脱黏损伤识别方法,通过建立黏接界面局部缺陷的双自由度非线性模型,利用多尺度方法分析了界面脱黏缺陷局部内共振产生机理,确定内共振损伤识别方法需要特定的激励条件;以铝梁黏接结构为试验对象,基于表面粘贴的压电作动/传感晶片,产生不同频率和幅值的激励信号,对传感晶片响应信号进行频谱分析,通过缺陷局部2∶1内共振出现特有的饱和现象对黏接界面脱黏损伤进行有效识别。仿真与试验结果表明,内共振饱和现象需要特定的激励条件,能够有效放大结构局部缺陷的非线性信号特征,提高了噪声干扰下的黏接结构界面脱黏非线性损伤的检测能力。

Interface debonding of bonded structures cause destruction of structural integrity.It is of great significance to effectively detect and evaluate interface bonding state.Here,a method to identify interface debonding damage based on local internal resonance of defect was proposed.By establishing a 2-DOF nonlinear model of local defect of bonding interface,the mechanism of local internal resonance of interface debonding defect was analyzed using the multi-scale method to determine the internal resonance damage identification method requiring specific excitation conditions.Taking an aluminum beam bonding structure as the experimental object,based on its surface bonded piezoelectric actuator/sensor chips,excitation signals with different frequencies and amplitudes were generated with actuator chips,and spectral analyses were performed for response signals of sensor chips.Debonding damage of bonding interface was effectively identified using specific saturation phenomenon appearing in local 2∶1 internal resonance of defects.Simulation and experimental results showed that internal resonance saturation phenomenon requires specific excitation conditions;it can effectively amplify nonlinear signal characteristics of structure local defects,and improve the detection ability of nonlinear damage of bonded structure interface debonding under noise interference.