Cure Monitoring of Adhesive for Composite/Metal Bonded Structure Based on Highly Nonlinear Solitary Waves

Wu Bin, Li Mingzhi, Liu Xiucheng, Wang Heying, He Cunfu, Liu Zongfa
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Abstract

In this paper, a nondestructive evaluation technique based on highly nonlinear solitary waves (HNSWs) is proposed to monitor the curing process of adhesive for composite/metal bonded structure. HNSWs are mechanical waves with high energy intensity and non-distortive nature which can form and propagate in a nonlinear system, such as a one-dimensional granular chain. In the present study, a finite element model of the one-dimensional granular chain is established with the commercial software Abaqus, to study the reflection behavior of HNSWs at the interface between the particle at the end of chain and the sample. The simulation results show that the time of flight (TOF) of the primary reflected solitary wave decreases with the stiffness of the sample increases, and the amplitude ratio (AR) between the primary reflected solitary wave and the incident solitary wave increases. An HNSWs transducer based on the one-dimensional granular chain is designed and fabricated. The relationship between the characteristic parameters of the primary reflected solitary wave (TOF and AR) and the curing time of adhesive for a composite/metal bonded structure is experimentally investigated. The experiment results suggest that the TOF decreases and the AR increases as the epoxy cures. The experimental results are in good agreement with the simulation results. This study provides a new characterization method for monitoring the curing process of adhesive for composite/metal bonded structure.
基于高度非线性孤立波的复合材料/金属粘结结构胶粘剂固化监测
本文提出了一种基于高度非线性孤立波(HNSWs)的复合材料/金属粘结结构胶粘剂固化过程无损检测技术。hnsw是一种具有高能量强度和无畸变性质的机械波,可以在一维颗粒链等非线性系统中形成和传播。本研究利用商业软件Abaqus建立一维颗粒链的有限元模型,研究链末端颗粒与样品界面处高分子量水颗粒的反射行为。仿真结果表明,随着试样刚度的增大,主反射孤立波的飞行时间(TOF)减小,主反射孤立波与入射孤立波的幅值比(AR)增大。设计并制作了一种基于一维颗粒链的HNSWs换能器。实验研究了复合材料/金属键合结构中主反射孤立波特征参数(TOF和AR)与胶粘剂固化时间的关系。实验结果表明,随着环氧树脂的固化,TOF减小,AR增大。实验结果与仿真结果吻合较好。本研究为监测复合材料/金属结合结构胶粘剂固化过程提供了一种新的表征方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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