Impact damage imaging and quantification in composite structures utilizing nonlinear ultrasonics measured by scanning laser Doppler vibrometry

Mingjing Cen; Yanfeng Shen; Zhaofei Shang

doi:10.1117/12.2582728

22 March 2021 Impact damage imaging and quantification in composite structures utilizing nonlinear ultrasonics measured by scanning laser Doppler vibrometry

Mingjing Cen, Yanfeng Shen, Zhaofei Shang

Author Affiliations +

Proceedings Volume 11593, Health Monitoring of Structural and Biological Systems XV; 115931R (2021) https://doi.org/10.1117/12.2582728
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

Composites are widely used in advanced mechanical and aerospace structures due to their outstanding material properties. As a major safety concern for composite structures, impact damage may cause severe mechanical property loss and load-bearing capacity decrease. Impact-induced delamination sites are usually hard to be detected. Thus, it is vital to develop a sensitive impact damage imaging and quantification methodology to facilitate the prompt repairmen and replacement of critical structural parts. This study presents a new nonlinear-ultrasonic-based damage detection technique called the phase mirroring technique. Such a technique utilizes the principles of vibro-acoustic modulation (VAM) and breakage of superposition. The paper starts with a 1D numerical model of the Contact Acoustic Nonlinearity (CAN) based on the Central Difference Method (CDF) to develop a solid understanding of the mechanism behind the ultrasonic nonlinearity. Thereafter, both harmonic and transient analyses are conducted on a 2D coupled-field finite element model with a simulated delamination area to explore the resonance spectrum of the specimen, providing the guidelines for the frequency choice of the pumping wave. Such selected pumping wave can fully vibrate the specimen and engage the nonlinearity to the maximum extend. Subsequently, the flow of the damage detection technique is presented using a 3D coupled-field transient dynamic finite element model. The impact damage is modeled taking a cone shape to better approximate a practical damage, in which the delamination area and stiffness loss vary with layers. This paper finishes with discussion, concluding remarks, and suggestions for future work.

Conference Presentation

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Mingjing Cen, Yanfeng Shen, and Zhaofei Shang "Impact damage imaging and quantification in composite structures utilizing nonlinear ultrasonics measured by scanning laser Doppler vibrometry", Proc. SPIE 11593, Health Monitoring of Structural and Biological Systems XV, 115931R (22 March 2021); https://doi.org/10.1117/12.2582728

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