Searched for: author:"Benedictus, R."
(1 - 20 of 56)

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Eleftheroglou, N. (author), Zarouchas, D. (author), Loutas, Theodoros (author), Alderliesten, R.C. (author), Benedictus, R. (author)
A novel framework to fuse structural health monitoring (SHM) data from different in-situ monitoring techniques is proposed aiming to develop a hyper-feature towards more effective prognostics. A state-of-the-art Non-Homogenous Hidden Semi Markov Model (NHHSMM) is utilized to model the damage accumulation of composite structures, subjected to...
journal article 2018
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Wang, W. (author), Rans, C.D. (author), Benedictus, R. (author)
Mechanically fastened joints are susceptible to the presence of multiple-site damage (MSD) cracks in the critical fastener row. Different from the MSD growth in joints consisting of metallic substrates, the two coupled metal crack growth and interfacial delamination propagation failure mechanisms in Fibre Metal Laminates (FMLs) make the...
journal article 2018
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Zhao, T. (author), Broek, C.A. (author), Palardy, G. (author), Fernandez Villegas, I. (author), Benedictus, R. (author)
The research in this paper is an essential part of a bigger effort on developing robust sequential ultrasonic welding of multi-spot welded joints in thermoplastic composites. It mainly focused on assessing the impact of the changes in boundary conditions on the welding process and whether it could be circumvented by using an appropriate...
journal article 2018
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van Kuijk, J.J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)
This paper discusses the appropriateness of crack length as a reference dimension for fatigue damage. Current discussion on short crack versus long crack data is still divided between various approaches to model small crack growth. A proper physical explanation of the probable cause of the apparent differences between short crack and long...
journal article 2018
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Quan, H. (author), Alderliesten, R.C. (author), Benedictus, R. (author)
Plastic energy dissipation is inevitable during fatigue crack growth. There have been previous attempts reported in literature to correlate the plastic dissipated energy (dW/dN) to fatigue crack growth rate (da/dN). However, at a given dW/dN, the da/dN changes with the ratio of minimum and maximum loads, known as the stress ratio. This paper...
journal article 2018
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Viegas Ochoa de Carvalho, Pedro (author), Fernandez Villegas, I. (author), Groves, R.M. (author), Benedictus, R. (author)
One of the advantages of thermoplastic composites relative to their thermoset counterparts is the possibility of assembling components through welding. Ultrasonic welding in particular is very promising for industrialization. However, uncertainty in the fatigue and fracture behaviour of composites is still an obstacle to the full utilisation...
journal article 2018
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Usman, M. (author), Pascoe, J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)
The effect of temperature on fatigue crack growth in epoxy adhesive bonds was investigated for a range of temperatures from -55 to 80[U+202F]°C. The fatigue crack growth behaviour was characterised using both strain energy release rate (SERR) and by measurements of energy dissipation. It was found that for a given maximum SERR, or a given...
journal article 2018
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Ewald, V.A. (author), Groves, R.M. (author), Benedictus, R. (author)
In this paper, we investigated transducer placement strategies for detecting cracks in primary aircraft structures using ultrasonic Structural Health Monitoring (SHM). The approach developed is for an expected damage location based on fracture mechanics, for example fatigue crack growth in a high stress location. To assess the performance of the...
journal article 2018
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Lavalette, N.P. (author), Bergsma, O.K. (author), Zarouchas, D. (author), Benedictus, R. (author)
In the context of lightweight structure design for the transportation and robotics industries, new types of composite structures are being developed, in the form of trusses made of fiber-reinforced polymer composite members of small diameter (a few millimeters thick at most). Some concepts of wound trusses can be found in the literature, but...
journal article 2017
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Wang, W. (author), Rans, C.D. (author), Benedictus, R. (author)
This paper proposes an analytical model for predicting the non-symmetric crack growth and accompanying delamination growth in FMLs. The general approach of this model applies Linear Elastic Fracture Mechanics, the principle of superposition, and displacement compatibility based on the understanding of deformation behaviour in eccentrically...
journal article 2017
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Amaral, L. (author), Alderliesten, R.C. (author), Benedictus, R. (author)
Due to the lack of fundamental knowledge of the physics behind delamination growth, certification authorities currently require that composite structures in aircraft are designed such that any delamination will not grow. This usually leads to an overdesign of the structure, hampering weight reductions. In real structures, delaminations tend...
journal article 2017
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Yao, L. (author), Sun, Y. (author), Zhao, M (author), Alderliesten, R.C. (author), Benedictus, R. (author)
This paper aims to investigate stress ratio effect on fibre bridging significance in mode I fatigue delamination growth of composite materials. Fatigue resistance curves (R-curves) of different stress ratios are determined and compared with the quasi-static R-curve. The fatigue R-curve of a high stress ratio is similar to the quasi-static...
journal article 2017
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Yao, L. (author), Sun, Y. (author), Alderliesten, R.C. (author), Benedictus, R. (author), Zhao, M (author)
Fibre bridging can significantly enhance delamination resistance making the use of a single Paris resistance curve to determine fatigue crack growth insufficient. An empirical Paris-type relation has been developed in a previous study to take fibre bridging into account in fatigue delamination growth. This relation was developed by correlating...
journal article 2017
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Viegas Ochoa de Carvalho, Pedro (author), Groves, R.M. (author), Benedictus, R. (author)
Certification is the key step towards the implementation of structural health monitoring (SHM) as part of condition based maintenance programmes of aircraft fleets. That can only be accomplished by demonstration of system performance in multiple scenarios and in a statistically relevant way. This paper describes a fully computational approach...
conference paper 2017
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Anand, C. (author), Shroff, S. (author), Groves, R.M. (author), Benedictus, R. (author)
Ultrasonic arrays are used for non-destructive evaluation of structures for aerospace and other applications. With the increase in the usage of fibre-reinforced composites in aerospace structures, this evaluation becomes complex due to the effects of attenuation and reflection from the layer boundaries in composite laminates. Hence there is...
conference paper 2017
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Zhao, T. (author), Palardy, G. (author), Fernandez Villegas, I. (author), Benedictus, R. (author)
Ultrasonic welding is a promising assembly technique for thermoplastic composites and it is well-suited for spot welding. In this study, two typical welding process control strategies, i.e. displacement-controlled and energy-controlled welding, were selected to manufacture spot-welded joints. The influence of different boundary conditions,...
conference paper 2017
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Motta Dias, M.H. (author), Jansen, K.M.B. (author), Luinge, J.W. (author), Bersee, H.E.N. (author), Benedictus, R. (author)
The influence of fiber-matrix adhesion on the linear viscoelastic creep behavior of ‘as received’ and ‘surface modified’ carbon fibers (AR-CF and SM-CF, respectively) reinforced polyphenylene sulfide (PPS) composite materials was investigated. Short-term tensile creep tests were performed on ±45° specimens under six different isothermal...
journal article 2016
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garcia, C (author), Lotz, T (author), Martinez, M.J. (author), Artemev, A (author), Alderliesten, R.C. (author), Benedictus, R. (author)
journal article 2016
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Pascoe, J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)
The available models for the prediction of fatigue crack growth in adhesive bonds rely on the similitude principle. In most cases, one of three similitude parameters based on the strain energy release rate (SERR) is used; i.e. Gmax, (Δ√G)2, or ΔG. In all cases it is usually observed that keeping the similitude parameter...
journal article 2016
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Pascoe, J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)
Measurement of the energy dissipation during fatigue crack growth is used as a technique to gain more insight into the physics of the crack growth process. It is shown that the amount of energy dissipation required per unit of crack growth is determined by Gmax, whereas the total amount of energy available for crack growth in a single cycle is...
conference paper 2016
Searched for: author:"Benedictus, R."
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