Experimental determination of dispersion diagrams over large frequency ranges for guided ultrasonic waves in fiber metal laminates

Barth, Tilmann; Wiedemann, Johannes; Roloff, Thomas; Behrens, Timothy E.J.; Rauter, Natalie; Hühne, Christian; Sinapius, Michael; Lammering, Rolf

doi:10.1088/1361-665x/ace0ea

Cited by 4 publications

(5 citation statements)

References 57 publications

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“…This is done by comparing the phase velocity-frequency relations. Based on the results in [20,25] on the dispersion behavior and the displacement fields of the two modes considered here, these modes are referred to as the fundamental symmetric mode S 0 and fundamental antisymmetric mode A 0 . For the computation of the data from the analytical framework, it is refered to [25].…”

Section: Comparison Of Numerical and Experiamental Resultsmentioning

confidence: 99%

“…Based on the results in [20,25] on the dispersion behavior and the displacement fields of the two modes considered here, these modes are referred to as the fundamental symmetric mode S 0 and fundamental antisymmetric mode A 0 . For the computation of the data from the analytical framework, it is refered to [25]. As for the FEM solutions, the underlying material parameters for the analytic framework correspond to those provided in Tab.…”

Section: Comparison Of Numerical and Experiamental Resultsmentioning

confidence: 99%

“…1 contains the used material parameters of the CFRP prepreg, taken from Johnston [27]. The suitability of these material parameters has been shown in previous work by the authors [25]. Additional sources for material parameters can also be found e. g. in [28][29][30].…”

Section: Materials Definitionmentioning

confidence: 99%

“…Within the scope of this work, only a brief description of the measurement procedure used to generate the experimental data can be provided. A more detailed insight into the setup and procedure of the measurements is given in previous work of the authors [25]. Therein also the reproducibility of these measurements with reference to measuring equipment and specimen shape is presented.…”

Section: Experimental Investigationsmentioning

confidence: 99%

“…The focus is on comparisons over large frequency ranges with high accuracy. To do this, existing experimental data from the authors [25] will be extended and compared with numerical finite element data from a two-dimensional eigenvalue analysis. The previous work shows that for wave propagation in fiber direction, the obtained experimental data are comparable to a numerical solution of the analytical framework using the GMM.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on Guided Ultrasonic Wave Dispersion Behavior in Fiber Metal Laminates Using Finite Element Eigenvalue Analysis

Barth

Wiedemann

Roloff

et al. 2023

Proc Appl Math and Mech

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Composite materials such as fiber metal laminates combine the advantages of metallic materials and fiber-reinforced polymers. Hence, these materials are of great interest for thin-walled structures in lightweight engineering. Due to the structure of these materials, damage to fiber metal laminate components occur more frequently inside the structure than with conventional materials. Since the detection of interlaminar damage is more complicated compared to external damage, it is one of the biggest challenges in the use of fiber metal laminates. One approach to detect this kinds of damage, is the use of guided ultrasonic waves, for example Lamb waves. To be able to perform such damage detection, knowledge about the propagation behavior of this kind of waves in fiber metal laminates is fundamental. Abrupt stiffness variations across the thickness of fiber metal laminates, resulting from the different material layers, lead to the question whether the known approaches for the propagation of guided ultrasonic waves in isotropic and transversely isotropic materials are applicable here. Therefore, the objective of this work is to investigate the propagation behavior of these guided ultrasonic waves in fiber-metal laminates over large frequency ranges. For this purpose, dispersion relations from finite element simulations are compared with experimental data and numerical solutions based on the analytical framework. The investigations are carried out using a fiber metal laminate consisting of steel and carbon fiber-reinforced polymers. Due to the orthotropy of the laminate, wave propagation in the fiber direction and perpendicular to it is considered. For the finite element simulations a linear two dimensional eigenvalue analysis is used. This method is especially suitable because it offers a very efficient modeling approach for this kind of application. The experimental data are based on measurements contained in previous publications by the authors. The comparison of the finite element simulations with the experimental data and the data from the analytical framework show that they are in good agreement. The results shown in this work serve to validate the numerical approach presented and allow for further, more complex simulations.

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Section: Comparison Of Numerical and Experiamental Resultsmentioning

confidence: 99%

Section: Comparison Of Numerical and Experiamental Resultsmentioning

confidence: 99%

Section: Materials Definitionmentioning

confidence: 99%

Section: Experimental Investigationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigations on Guided Ultrasonic Wave Dispersion Behavior in Fiber Metal Laminates Using Finite Element Eigenvalue Analysis

Barth

Wiedemann

Roloff

et al. 2023

Proc Appl Math and Mech

Self Cite

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Optimising structural health monitoring systems: A 2D numerical investigation on impedance matching for FML with integrated sensors

Rottmann,

Mangalath,

Weber

2024

Proc Appl Math and Mech

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Fibre metal laminates (FML) represent an innovative class of advanced composite materials that integrate the mechanical properties of both metals and fibre‐reinforced composites (FRP). Combining the strength and ductility of metals with the lightweight and high stiffness of FRP and FMLs have emerged as new material compositions for applications in chemical, nuclear, automobile, and aerospace engineering disciplines. Structural health monitoring (SHM) using guided ultrasonic waves (GUW) is the state‐of‐the‐art for non‐destructive testing of thin‐walled structures. When applied to FML, SHM plays a crucial role in monitoring the integrity over time and detecting potential damage such as delamination, fibre breakage, or other structural anomalies. In SHM with GUW, a wave‐field is emitted by actuators. This wave‐field can be affected by damage in the structure, thereby changing its propagation characteristics. Sensors monitor the interaction between damage and GUW, which can be utilized to locate and classify the damage and ascertain the overall health state of the structure. In this study, an advanced integration of measurement hardware, that is, sensors and actuators, within the laminate structure is investigated. Sensor integration into FML allows for improved and more sophisticated monitoring capabilities in comparison to measuring techniques like laser vibrometers, which are limited to measuring displacements on the surface of the structure. However, the integration of sensors and actuators yields the technical difficulty of distorting the wave‐fields and may result in an over‐ or underestimation of the damage. Similar to damage, the distortion of the wave‐field is caused by the changes in acoustic impedance resulting from different material properties. In a previous study, incorporating a functionally graded artificial interphase through acoustic impedance matching between the sensor and host material showed notable and significant outcomes. The current contribution extends the prior graded artificial interphase for an isotropic homogeneous material to an FML structure. This paper presents a comprehensive numerical simulation study on a two‐dimensional model of FML with integrated sensors. The interphases are designed based on impedance matching, which improves signal transmission and reduces disturbing reflections. The conducted investigations hold for several interphase configurations for a wide frequency range. The optimised integration of sensors demonstrates promising results for enhancing the reliability and accuracy of SHM systems. This research serves as a foundation for further experimental validation and the development of advanced sensor‐integrated FML structures with improved monitoring capabilities.

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Mechanic-electric-thermal coupling simulation method of Lamb wave under variable temperature

Zhang,

Yang,

Wang

et al. 2024

Measurement

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Experimental determination of dispersion diagrams over large frequency ranges for guided ultrasonic waves in fiber metal laminates

Cited by 4 publications

References 57 publications

Investigations on Guided Ultrasonic Wave Dispersion Behavior in Fiber Metal Laminates Using Finite Element Eigenvalue Analysis

Investigations on Guided Ultrasonic Wave Dispersion Behavior in Fiber Metal Laminates Using Finite Element Eigenvalue Analysis

Optimising structural health monitoring systems: A 2D numerical investigation on impedance matching for FML with integrated sensors

Mechanic-electric-thermal coupling simulation method of Lamb wave under variable temperature

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