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A Unique Method to Describe the Bonding Strength in a Bonded Solid-S-olid Interface by contact acoustic nonlinearity

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Chinese Physics Letters 2009年第1期26卷 157-160页

作者：陈建军章德毛一葳程建春 Institute of acoustics Key Laboratory of Modern Acoustics Nanjing University Nanjing 210093

We present a unique method to describe the bonding strength at a bonded solid-solid interface in a multilayered composite material by contact acoustic nonlinearity （CAN） parameter. A CAN model on the bonded solid-solid interface is depicted. It can be seen from the model that CAN parameter is very sensitive to the bonding strength at the interface. When an incident focusing acoustic longitudinal wave scans the interface in two dimensions, the transmitted wave can be used to extract CAN parameter. The contour of the bonding strength for a sample is obtained by CAN parameter. The results show that the region with weak bonding strength can be easily distinguished from the contour.

关键词： PROPAGATION Bonded Solid-Solid contact acoustic nonlinearity

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Microcrack localization using a collinear Lamb wave frequency-mixing technique in a thin plate

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Chinese Physics B 2022年第1期31卷 364-373页

作者： Ji-Shuo Wang Cai-Bin Xu You-Xuan Zhao Ning Hu Ming-Xi Deng College of Aerospace Engineering Chongqing UniversityChongqing400044China School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China

A novel Lamb wave frequency-mixing technique is proposed for locating microcracks in a thin plate,which does not require the resonance condition of Lamb wave mixing and can accurately locate the microcracks through only one-time *** on the bilinear stress-strain constitutive model,a two-dimensional finite element(FE)model is built to investigate the frequency-mixing response induced by the interaction between two primary Lamb waves and a *** two primary Lamb waves of A0 and S0 modes with different frequencies excited on the same side of the plate simultaneously impinge on the examined microcrack,under the modulation of the contact acoustic nonlinearity,the microcrack itself can be deemed as the secondary sound source and it will radiate the Lamb waves of new combined *** on the time of flight of the generated A0 mode at difference frequency,an indicator named normalized amplitude index(NAI)is defined to directly locate the multi-microcracks in the given *** is found that the number and location of the microcracks can be intuitively visualized by using the NAI based frequency-mixing *** is also demonstrated that the proposed frequency mixing technique is a promising approach for the microcrack localization.

关键词： frequency-mixing of Lamb waves contact acoustic nonlinearity bilinear stress-strain constitutive model microcrack localization

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A CAN METHOD TO IMAGE THE QUANTITATIVE BONDING STRENGTH AT THE BONDED SOLID-SOLID INTERFACE

A CAN METHOD TO IMAGE THE QUANTITATIVE BONDING STRENGTH AT T...

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2012全国压电和声波理论及器件技术研讨会

作者： Jian-jun CHEN De ZHANG Yi-wei MAO Institute of acoustics Key Laboratory of Modern AcousticsNanjing University

As well known,when a longitudinal wave propagates through an interface with micro-cracks and micro-defects between solids,the contact acoustic nonlinearity（CAN） will be generated dramatically and the nonlinear parameter can be used to contour the bonding state of the *** the contour can only show the relative state of bonding strength and can not be used to judge weather the multilayered composite materials in use is safe because the safe judgment is not by the relative state while by the absolute value of the bonding *** characterization of quantitative bonding strength at the interface is very important for judging a multilayered material in safe *** this paper,how to get the quantitative bonding strength from the CAN parameter is *** the vibration amplitude of incident focusing wave at the bonded interface was calculated,the standard bonding strength with complete bonding state was established by tension test and CAN parameter is calibrated,the quantitative imaging of the bonding strength is obtained by CAN microscope in *** the imaging,the positions with weak bonding strength could be easily located,which can be used to decide whether the material could be employed continuously.

关键词： Bonding strength Quantitative imaging contact acoustic nonlinearity

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