Research Repository

See what's under the surface


A wave-based numerical scheme for damage detection and identification in two-dimensional composite structures (2019)
Journal Article
Apalowo, R., & Chronopoulos, D. (2019). A wave-based numerical scheme for damage detection and identification in two-dimensional composite structures. Composite Structures, doi:10.1016/j.compstruct.2019.01.098

Previous studies on wave inspection in different propagation directions have focussed on the analysis of wave propagation and wave scattering from various types of joints in two-dimensional monolayered structures. In this work, a Finite Element (FE)... Read More

A robust Bayesian methodology for damage localization in plate-like structures using ultrasonic guided-waves (2018)
Journal Article
Cantero-Chinchilla, S., Chiachío, M., Chiachío, J., Chronopoulos, D., & Jones, A. (2019). A robust Bayesian methodology for damage localization in plate-like structures using ultrasonic guided-waves. Mechanical Systems and Signal Processing, 122, 192-205. doi:10.1016/j.ymssp.2018.12.021

SHM methods for damage detection and localization in plate-like structures have typically relied on signal post-processing techniques applied to ultrasonic guided-waves. The time of flight is one of these signals features which has been extensively u... Read More

Mechanical vibration bandgaps in surface-based lattices (2018)
Journal Article
Elmadih, W., Syam, W. P., Maskery, I., Chronopoulos, D., & Leach, R. (2019). Mechanical vibration bandgaps in surface-based lattices. Additive Manufacturing, 25, 421-429. doi:10.1016/j.addma.2018.11.011

In this paper, the phonon dispersion curves of several surface-based lattices are examined, and their energy transmission spectra, along with the corresponding bandgaps are identified. We demonstrate that these bandgaps may be controlled, or tuned, t... Read More

Band gap behavior of optimal one-dimensional composite structures with an additive manufactured stiffener (2018)
Journal Article
Ampatzidis, T., Leach, R. K., Tuck, C., & Chronopoulos, D. (2018). Band gap behavior of optimal one-dimensional composite structures with an additive manufactured stiffener. Composites Part B: Engineering, 153, doi:10.1016/j.compositesb.2018.07.012. ISSN 1359-8368

In this work, the banded behaviour of composite one-dimensional structures with an additive manufactured stiffener is examined. A finite element method is used to calculate the stiffness, mass and damping matrices, and periodic structure theory is us... Read More

Electromagnetic shielding effectiveness of fiber-reinforced composites: a preliminary study (2018)
Conference Proceeding
Munalli, D., Chronopoulos, D., & Greedy, S. (2018). Electromagnetic shielding effectiveness of fiber-reinforced composites: a preliminary study

The use of Low power Radio Frequency (RF) based techniques as Non Destructive Testing (NDT) methods offers a potential solution for detecting defects and anomalies occurring in the structural integrity of composite based structures in real time, enab... Read More

Accurate structural identification for layered composite structures, through a wave and finite element scheme (2017)
Journal Article
Chronopoulos, D., Droz, C., Apalowo, R., Ichchou, M., & Yan, W. (2017). Accurate structural identification for layered composite structures, through a wave and finite element scheme. Composite Structures, 182, doi:10.1016/j.compstruct.2017.09.062. ISSN 0263-8223

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) approac... Read More

Examination of acoustic insulation of composite metamaterials with negative stiffness elements inclusions (2017)
Conference Proceeding
Ampatzidis, T., & Chronopoulos, D. (2017). Examination of acoustic insulation of composite metamaterials with negative stiffness elements inclusions

Damping is one of the most important properties of materials, being responsible for increased durability and conmfort of the structures. In this paper the damping enhancement of materials with internal oscillators is examined. Wave Finite Element (WF... Read More

Parametric study of control of frequency banded behaviour of periodic pressurised composite structures (2017)
Conference Proceeding
Ampatzidis, T., & Chronopoulos, D. (2017). Parametric study of control of frequency banded behaviour of periodic pressurised composite structures

Periodic structures are very common in engineering, such as airplane fuselages and train rails. This periodicity has been observed to be the cause of banded frequency response after mechanical excitation. This response can be engineered so that noise... Read More

Wave sensitivity analysis for periodic and arbitrarily complex composite structures (2017)
Journal Article
Chronopoulos, D., Collet, M., & Ichchou, M. (in press). Wave sensitivity analysis for periodic and arbitrarily complex composite structures. Engineering Computations, doi:10.1108/EC-06-2016-0200. ISSN 0264-4401

Purpose: This paper presents the development of a numerical continuum-discrete approach for computing the sensitivity of the waves propagating in periodic composite structures. The work can be directly employed for evaluating the sensitivity of the s... Read More

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions (2016)
Journal Article
Chronopoulos, D., Antoniadis, I., & Ampatzidis, T. (2017). Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions. Extreme Mechanics Letters, 12, doi:10.1016/j.eml.2016.10.012. ISSN 2352-4316

Despite the fact that the concept of incorporating Negative Stiffness (NS) elements within mechanical systems was formulated and validated more than 40 years ago, it has only recently received consistent attention. In this work, the design of a layer... Read More

Wave steering effects in anisotropic composite structures: direct calculation of the energy skew angle through a finite element scheme (2016)
Journal Article
Chronopoulos, D. (2017). Wave steering effects in anisotropic composite structures: direct calculation of the energy skew angle through a finite element scheme. Ultrasonics, 73, doi:10.1016/j.ultras.2016.08.020. ISSN 0041-624X

A systematic expression quantifying the wave energy skewing phenomenon as a function of the mechanical characteristics of a non-isotropic structure is derived in this study. A structure of arbitrary anisotropy, layering and geometric complexity is mo... Read More

Acoustic transmission properties of pressurised and pre-stressed composite structures (2016)
Journal Article
Ampatzidis, T., & Chronopoulos, D. (in press). Acoustic transmission properties of pressurised and pre-stressed composite structures. Composite Structures, doi:10.1016/j.compstruct.2016.06.027. ISSN 0263-8223

this work was focused on the examination of the effect of the pre-stress, namely tension and pressure, on the wave propagation and acoustic behaviour of composite laminates. The dispersion characteristics of two dimensional layered and sandwich struc... Read More

Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads (2016)
Journal Article
Polenta, V., Garvey, S. D., Chronopoulos, D., Long, A. C., & Morvan, H. (2016). Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads. Thin-Walled Structures, 105, doi:10.1016/j.tws.2016.04.002. ISSN 0263-8231

The paper proposes a novel type of stiffener designed to bear bending loads by exploiting internal pressure effects. The stiffener is made of two adjacent thin-walled pipes (r/t≥50) jointed with a connecting strip. Such a structure is shown to have h... Read More

Design optimization of composite structures operating in acoustic environments (2015)
Journal Article
Chronopoulos, D. (2015). Design optimization of composite structures operating in acoustic environments. Journal of Sound and Vibration, 355, doi:10.1016/j.jsv.2015.06.028. ISSN 0022-460X

The optimal mechanical and geometric characteristics for layered composite structures subject to vibroacoustic excitations are derived. A Finite Element description coupled to Periodic Structure Theory is employed for the considered layered panel. St... Read More

Enhancement of wave damping within metamaterials having embedded negative stiffness inclusions (2015)
Journal Article
Chronopoulos, D., Antoniadis, I., Collet, M., & Ichchou, M. (2015). Enhancement of wave damping within metamaterials having embedded negative stiffness inclusions. Wave Motion, 58, doi:10.1016/j.wavemoti.2015.05.005. ISSN 0165-2125

The wave dissipation properties of layered periodic structures are modelled by FE as well as analytical approaches. A linear oscillator incorporating a negative stiffness element and having exceptional energy dissipation properties is exhibited and i... Read More

Hyper-damping properties of a stiff and stable linear oscillator with a negative stiffness element (2015)
Journal Article
Antoniadis, I., Chronopoulos, D., Spitas, V., & Koulocheris, D. (2015). Hyper-damping properties of a stiff and stable linear oscillator with a negative stiffness element. Journal of Sound and Vibration, 346, doi:10.1016/j.jsv.2015.02.028. ISSN 0022-460X

A simple, stiff, statically and dynamically stable linear oscillator incorporating a negative stiffness element is used as a template to provide a generic theoretical basis for a novel vibration damping and isolation concept. This oscillator is desig... Read More

Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach (2013)
Journal Article
Chronopoulos, D., Ichchou, M., Troclet, B., & Bareille, O. (2014). Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach. Applied Acoustics, 77, doi:10.1016/j.apacoust.2013.10.002. ISSN 0003-682X

A robust procedure for the prediction of the dynamic response of layered panels within a SEA wave-context approach is proposed hereby. The dispersion characteristics of two dimensional composite orthotropic structures are predicted using a Wave Finit... Read More

Predicting the broadband response of a layered cone-cylinder-cone shell (2013)
Journal Article
Chronopoulos, D., Ichchou, M., Troclet, B., & Bareille, O. (2014). Predicting the broadband response of a layered cone-cylinder-cone shell. Composite Structures, 107, doi:10.1016/j.compstruct.2013.07.055. ISSN 0263-8223

The dynamic response of an aerospace layered structure composed of a combination of conical and cylindrical shells is hereby modelled. In the low and the mid-frequency ranges a WFEM derived ESL approach implemented within a FEM is used in order to pr... Read More

Low-frequency wide band-gap elastic/acoustic metamaterials using the K-damping concept
Journal Article
Antoniadis, I., Chatzi, E., Chronopoulos, D., Paradeisiotis, A., Sapountzakis, I., & Konstantopoulos, S. (in press). Low-frequency wide band-gap elastic/acoustic metamaterials using the K-damping concept

The terms “acoustic/elastic meta-materials” describe a class of periodic structures with unit cells exhibiting local resonance. This localized resonant structure has been shown to result in negative effective stiffness and/or mass at frequency ranges... Read More