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Eleftheroglou, N. (author), Zarouchas, D. (author), Benedictus, R. (author)Data driven probabilistic methodologies have found increasing use the last decade and provide a platform for the remaining useful life (RUL) prediction of composite structures utilizing health-monitoring data. Of particular interest is the RUL prediction of composite structures that either underperform or outperform due to unexpected...journal article 2020
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Influence of geometrical parameters on the strength of Hybrid CFRP-aluminium tubular adhesive jointsLavalette, N. (author), Bergsma, O.K. (author), Zarouchas, D. (author), Benedictus, R. (author)Tubular adhesive joints, used in truss structures to join pultruded carbon fibre-reinforced polymer members to aluminium nodes, are modelled with varying dimensions. The numerical model uses a Cohesive Zone Modelling formulation with a trapezoidal traction-separation law for the adhesive layer, and experimental tests are carried to validate...journal article 2020
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Saeedifar, M. (author), Saleh, M. (author), El-Dessouky, Hassan M. (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)This study is devoted to the damage characterization of Non-Crimp Fabric (NCF), 2D plain-woven (2D-PW) and 3D orthogonal plain-woven (ORT-PW) carbon/epoxy laminates, subjected to compression after multiple-impact loading, using Acoustic Emission (AE). The ultrasonic C-scan images showed that the interlaminar damage area induced by the single and...journal article 2020
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Saleh, M. (author), Saeedifar, M. (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)Mechanics of double-lap Steel-to-CFRP adhesively-bonded joints loaded in tension are investigated experimentally using Digital Image Correlation (DIC) and Acoustic Emission (AE), analytically using a one-dimensional closed-form solution and numerically with Finite Element analysis. The double-lap bi-material joints are fabricated of a steel core...journal article 2020
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Saeedifar, M. (author), Zarouchas, D. (author)Damage characterization of laminated composites has been thoroughly studied the last decades where researchers developed several damage models, and in combination with experimental evidence, contributed to better understanding of the structural behavior of these structures. Experimental techniques played an essential role on this progress and...review 2020
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Broer, Agnes A.R. (author), Zarouchas, D. (author), Benedictus, R. (author)Experimental campaign to develop a multi-sensing structural health monitoring (SHM) framework in order to diagnose impact damage in stiffened composite aircraft structures on all four SHM levels, namely 1) detection, 2) localisation, 3) type, and 4) severity.poster 2020
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Kupski, J.A. (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)The aim of this study is to evaluate the enhanced off-axis properties of thin plies to improve the performance of adhesively bonded carbon fiber reinforced polymers. Single lap bonded joints with three different ply thicknesses of 200 μm, 100 μm and 50 μm were tested under quasi-static tensile loading. Acoustic Emission and Digital Image...journal article 2020
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A cycle-by-cycle fatigue damage analysis of biaxial composite structures utilizing acoustic emissionZarouchas, D. (author), Pascoe, J.A. (author), Alderliesten, R.C. (author)In the present work, a fatigue damage analysis of biaxial Carbon Fibre Reinforced Polymer (CFRP) specimens loaded at two different stress levels and a fatigue ratio, R=0.1, was performed. A cycle-by-cycle approach was used, utilizing results from Acoustic Emission (AE) measurements. The aim was to investigate the influence of the applied...conference paper 2020
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Wang, W. (author), Poulis, J.A. (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)Adhesive bonding is a highly desirable joining technique to join composites to metals. The surfaces of both composite and metal substrates have to be carefully treated before bonding them together, in order to avoid interface failure between the adherend's surface and adhesive. This paper describes the surface pretreatments on carbon fiber...conference paper 2020
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Saeedifar, M. (author), Mansvelder, Jasmijn (author), Mohammadi, R. (author), Zarouchas, D. (author)This study aims to use the passive and active acoustic-based health monitoring methods for impact damage assessment of composite structures. To this aim, a Carbon Fiber Reinforced Polymer (CFRP) composite plate was fabricated and subjected to a simulated low-velocity impact by performing repeated quasi-static indentation tests where a loading...journal article 2019
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Broer, Agnes A.R. (author), Zarouchas, D. (author)A new constant life diagram (CLD) model is proposed to predict the fatigue life of carbon fibre-reinforced epoxy laminates under constant amplitude (CA) loading. The CLD is asymmetric and non-linear, and it is built upon the anisomorphic CLD model. It consists of two sub-models; one sub-model is applicable to laminates with lay-ups...journal article 2019
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Saleh, M. (author), El-Dessouky, Hassan M. (author), Saeedifar, M. (author), Teixeira De Freitas, S. (author), Scaife, Richard J. (author), Zarouchas, D. (author)This paper investigates the effect of the fabric architecture and the z-binding yarns on the compression after multiple impacts behavior of composites. Four fiber architectures are investigated: non-crimp fabric (NCF), 2D plain weave (2D-PW), 3D orthogonal plain (ORT-PW) and twill (ORT-TW) weave. The specimens were subjected to single and...journal article 2019
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Saeedifar, M. (author), Saleh, M. (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)The aim of the present study is to characterize the damage in bi-material steel-to-composite double-lap adhesively-bonded joints using Acoustic Emission (AE). Two different structural adhesives, a ductile (Methacrylate-based) and brittle (Epoxy-based), were used to bond CFRP skins to a steel core. The fabricated joints were loaded in tension...journal article 2019
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Eleftheroglou, N. (author), Zarouchas, D. (author), Loutas, Theodoros (author), Mansouri, Sina Sharif (author), Georgoulas, George (author), Karvelis, Petros (author), Nikolakopoulos, George (author), Benedictus, R. (author)This paper examines diagnostics and prognostics of Lithium-Polymer (Li-Po) batteries for unmanned aerial vehicles (UAVs). Several discharge voltage histories obtained during actual indoor flights constitute the training data for a data-driven approach, utilizing the Non-Homogenous Hidden Semi Markov model (NHHSMM). NHHSMM is a suitable candidate...conference paper 2019
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Eleftheroglou, N. (author), Zarouchas, D. (author), Benedictus, R. (author)The procedure of fatigue damage accumulation in composite structures is still unknown and depends on several parameters such as type and frequency of loading, stacking sequence and material properties. Additionally, the nonhomogeneous and anisotropic nature of composites result to a stochastic activation of the different failure mechanisms and...conference paper 2019
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Tapeinos, I. (author), Rajabzadeh, Aydin (author), Zarouchas, D. (author), Stief, Malte (author), Groves, R.M. (author), Koussios, S. (author), Benedictus, R. (author)This study focuses on the understanding of the thermal and structural behavior of an innovative Type IV multi-spherical composite-overwrapped pressure vessel through an experimental assessment that consists of hydrostatic testing at ambient conditions and pressure cycling with a cryogenic medium (LN<sub>2</sub>). During hydro-burst testing at...journal article 2019
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Maleki, Abdullah (author), Saeedifar, M. (author), Ahmadi Najafabadi, Mehdi (author), Zarouchas, D. (author)The aim of this study is to investigate the failure of cracked aluminum plates repaired by one-side composite patches under fatigue loading using Acoustic Emission (AE) and fractography images. Rectangular specimens made of 6061 aluminum alloy with central through thickness pre-cracks were repaired using glass/epoxy laminated patches. The...journal article 2019
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Saeedifar, M. (author), Saleh, M.M.A.H. (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)The increasing use of Adhesively-bonded joints in industrial applications resulted in more attention to damage assessment in these joints. The aim of the present study is to characterize the damage in bi-material double-lap adhesively-bonded joints by Acoustic Emission (A E). Two different structural adhesives, representing a ductile ...conference paper 2019
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Daneshjoo, Z. (author), Shokrieh, Mahmood M. (author), Fakoor, Mahdi (author), Alderliesten, R.C. (author), Zarouchas, D. (author)In order to understand the physics of the delamination onset in laminated composites, an experimental investigation of delamination growth is presented. The main objective of this paper is to demonstrate that delamination onset occurs at lower values than Gc defined by the ASTM standards, and that the strain energy release rate level at which...journal article 2019
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Kupski, J.A. (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author), Benedictus, R. (author)The goal of this study is to investigate new designs of composite bonded joints in order to improve their strength under tensile loading. Multiple stacked overlaps are compared with single overlap designs. The concept of multiple stacking is well known as ply-interleaving technique for co-curing dissimilar materials. For a secondary bonding...conference paper 2019