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Article

Enhancement of a New Methodology Based on the Impulse Excitation Technique for the Nondestructive Determination of Local Material Properties in Composite Laminates

1
Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
2
IMAST S.c.ar.l.—Technological District on Engineering of Polymeric and Composite Materials and Structures, 80133 Napoli, Italy
Appl. Sci. 2021, 11(1), 101; https://doi.org/10.3390/app11010101
Received: 30 October 2020 / Revised: 4 December 2020 / Accepted: 17 December 2020 / Published: 24 December 2020
(This article belongs to the Special Issue Nondestructive Testing (NDT): Volume II)
A new approach for the nondestructive determination of the elastic properties of composite laminates is presented. The approach represents an improvement of a recently published experimental methodology based on the Impulse Excitation Technique, which allows nondestructively assessing local elastic properties of composite laminates by isolating a region of interest through a proper clamping system. Different measures of the first resonant frequency are obtained by rotating the clamping system with respect to the material orientation. Here, in order to increase the robustness of the inverse problem, which determines the elastic properties from the measured resonant frequencies, information related to the modal shape is retained by considering the effect of an additional concentrated mass on the first resonant frequency. According to the modal shape and the position of the mass, different values of the first resonant frequency are obtained. Here, two positions of the additional mass, i.e., two values of the resonant frequency in addition to the unloaded frequency value, are considered for each material orientation. A Rayleigh–Ritz formulation based on higher order theory is adopted to compute the first resonant frequency of the clamped plate with concentrated mass. The elastic properties are finally determined through an optimization problem that minimizes the discrepancy on the frequency reference values. The proposed approach is validated on several materials taken from the literature. Finally, advantages and possible limitations are discussed. View Full-Text
Keywords: material properties determination; vibrational analysis; laminated composites; modal shape characterization; Rayleigh–Ritz method material properties determination; vibrational analysis; laminated composites; modal shape characterization; Rayleigh–Ritz method
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MDPI and ACS Style

Boursier Niutta, C. Enhancement of a New Methodology Based on the Impulse Excitation Technique for the Nondestructive Determination of Local Material Properties in Composite Laminates. Appl. Sci. 2021, 11, 101. https://doi.org/10.3390/app11010101

AMA Style

Boursier Niutta C. Enhancement of a New Methodology Based on the Impulse Excitation Technique for the Nondestructive Determination of Local Material Properties in Composite Laminates. Applied Sciences. 2021; 11(1):101. https://doi.org/10.3390/app11010101

Chicago/Turabian Style

Boursier Niutta, Carlo. 2021. "Enhancement of a New Methodology Based on the Impulse Excitation Technique for the Nondestructive Determination of Local Material Properties in Composite Laminates" Applied Sciences 11, no. 1: 101. https://doi.org/10.3390/app11010101

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