scholarly journals Transient ultrasonic guided wave simulation in layered composite structures using a hybrid wave and finite element scheme

2020 ◽  
Vol 246 ◽  
pp. 112376
Author(s):  
Muhammad Khalid Malik ◽  
Dimitrios Chronopoulos ◽  
Gregor Tanner
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Layered Composite ◽  
Guided Wave ◽  
Hybrid Wave ◽  
Finite Element Scheme ◽  
Element Scheme ◽  
Wave Simulation ◽  
Ultrasonic Guided Wave ◽  
Layered Composite Structures

scholarly journals A wave and finite element methodology for structural identification in layered composite structures

2018 ◽  
Vol 211 ◽  
pp. 19004 ◽  
Author(s):  
Rilwan Kayode Apalowo ◽  
Dimitrios Chronopoulos ◽  
Muhammed Malik
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Excitation Frequency ◽  
Correlation Method ◽  
Layered Composite ◽  
Single Shot ◽  
Transition Range ◽  
Frequency Spectra ◽  
Periodic Composite ◽  
Layered Composite Structures

In this work we present for the first time an approach for identifying the geometric and material characteristics of layered composite structures through an inverse wave and finite element approach. More specifically, this Non-Destructive Evaluation (NDE) approach is able to recover the thickness, density, as well as all independent mechanical characteristics such as the tensile and shear moduli for each layer of the composite structure under investigation. This is achieved through multi-frequency single shot measurements. It is emphasized that the success of the approach is independent of the employed excitation frequency regime, meaning that both structural dynamics and ultrasound frequency spectra can be employed. It is demonstrated that more efficient convergence of the identification process is attained closer to the bending-to-shear transition range of the layered structure. Since a full FE description is employed for the periodic composite, the presented approach is able to account for structures of arbitrary complexity. The procedure is applied to a sandwich panel with composite facesheets and results are compared with two wave-based characterization techniques: the Inhomogeneous Wave Correlation method and the Transition Frequency Characterization method. Numerical simulations and experimental results are presented to verify the robustness of the proposed method.

scholarly journals Ultrasonic Guided Wave Testing on Cross-Ply Composite Laminate: An Empirical Study

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5291
Author(s):  
Gerardo Aranguren ◽  
Josu Etxaniz ◽  
Sergio Cantero-Chinchilla ◽  
Jose M. Gil-Garcia ◽  
Muhammad Khalid Malik
Keyword(s):  
Composite Structures ◽  
Composite Laminate ◽  
Guided Waves ◽  
Layered Composite ◽  
Guided Wave ◽  
High Signal ◽  
Active Sensors ◽  
Ultrasonic Guided Wave ◽  
Nominal Voltage ◽  
The Waves

Structural health monitoring comprises a set of techniques to detect defects appearing in structures. One of the most viable techniques is based on the guided ultrasonic wave test (UGWT), which consists of emitting waves throughout the structure, acquiring the emitted waves with various sensors, and processing the waves to detect changes in the structure. The UGWT of layered composite structures is challenging due to the anisotropic wave propagation characteristics of such structures and to the high signal attenuation that the waves experience. Hence, very low amplitude signals that are hard to distinguish from noise are typically recovered. This paper analyzes the propagation of guided waves along a cross-ply composite laminate following an empirical methodology. The research compares several implementations for UGWT with piezoelectric wafer active sensors. The reference for comparison is set on a basic mode, which considers the application of nominal voltage to a single sensor. The attenuation and spreading of the waves in several directions are compared when more energy is applied to the monitored structure. In addition, delayed multiple emission is also considered in multisensor tests. The goal of all the UGWT configurations is to transmit more energy to the structure such that the echoes of the emission are of greater amplitude and they ease the signal processing. The study is focused on the realization of viable monitoring systems for aeronautical composite made structures.

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