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Pascoe, J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)The concept of relating fatigue disbond growth to the strain energy release rate (SERR) is critically examined. It is highlighted that the common practise of using only the maximum SERR or only the SERR range is insufficient to correctly characterize a load cycle. As crack growth requires energy, it is argued that growth should be related to the...journal article 2014
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Liu, P. (author), Groves, R.M. (author), Benedictus, R. (author)Optical coherence elastography (OCE) has been applied to the study of microscopic deformation in biological tissue under compressive stress for more than a decade. In this paper, OCE has been extended for the first time, to the best of our knowledge, to deformation measurement in a glass fiber composite in the field of nondestructive testing. A...journal article 2014
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Pascoe, J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)Current prediction methods for growth of disbonds under fatigue loading are generally based on a correlation with either the maximum strain energy release rate (SERR) or the SERR range. This paper highlights some issues with this approach. In particular, it is argued that the maximum SERR or the SERR range alone do not give sufficient...journal article 2014
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Amaral, L. (author), Yao, L. (author), Alderliesten, R.C. (author), Benedictus, R. (author)This work proposes to treat quasi-static mode I delamination growth of CFRP as a low-cycle fatigue process. To this end, mode I quasi-static and fatigue delamination tests were performed. An average physical Strain Energy Release Rate (SERR), derived from an energy balance, is used to characterize the energy released in crack extension. The...conference paper 2015
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Miesen, N. (author), Sinke, J. (author), Groves, R.M. (author), Benedictus, R. (author)The novelty of the research is the detection of different types of flaws in the prepreg carbon fibre-reinforced fibres (CFRP) layup compared to in cured products. This paper presents the development of a new method for in situ detection of prepreg CFRP production flaws combining laser displacement sensors and analytical modelling. Experimental...journal article 2015
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Yao, L. (author), Alderliesten, R.C. (author), Benedictus, R. (author)This paper provides a study on mode I fatigue delamination growth in composite laminates using energy principles. Experimental data has been obtained from fatigue tests conducted on Double Cantilever Beam (DCB) specimens at various stress ratios. A concept of fatigue fracture toughness is proposed to interpret the stress ratio effect in crack...conference paper 2015
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Skandali, M. (author), Jansen, K.M.B. (author), Koussios, S. (author), Sinke, J. (author), Benedictus, R. (author)The purpose of this study is to simulate the two-dimensional, transient and continuous heat transfer during the thermoset Automated Tape Laying (ATL) process. The heat transfer analysis is coupled with a cure kinetics model of the thermoset prepreg tapes used for the process. Unlike most studies, the process is modelled in a Lagrangian framework...conference paper 2015
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Koutras, N. (author), Fernandez Villegas, I. (author), Benedictus, R. (author)In this work, the effect of temperature exposure on the strength of resistance welded joints is analysed. Glass fibre polyphenylene sulphide (GF/PPS) laminates were joined using the resistance welding technique and a stainless steel metal mesh as the heating element. Single lap shear tests at temperatures between 20°C and 150°C were performed to...conference paper 2015
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De Mooij, C. (author), Martinez, M. (author), Benedictus, R. (author)Existing shape sensing methods use individual sensor types, determining either strain or displacement well, but not both. More accurate shape sensing could improve load estimation, necessary for accurate life assessment of the structure.conference paper 2015
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Ochoa, P. (author), Groves, R.M. (author), Benedictus, R. (author)Ultrasonic Lamb wave techniques are described as one of the most encouraging developments for structural health monitoring of aerospace composite structures. The reliability of those techniques is highly dependent on the quality of signal processing algorithms capable of extracting useful information out of complex responses. When damage...conference paper 2015
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Martinez Bueno, P. (author), Martinez, M.J. (author), Rans, C.D. (author), Benedictus, R. (author)The primary objective of this research study was to evaluate the capabilities for measuring strain of a composite UAV wing with an embedded optical fiber connected to a Rayleigh backscattering distributed sensing system. This research paper summarizes the manufacturing procedure used during the instrumentation of the composite UAV wing. In...journal article 2016
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de Mooij, C. (author), Martinez, M.J. (author), Benedictus, R. (author)Computing global strain distributions in complex aerospace and wind energy structures in quasi-real time is an important challenge for the aerospace and wind energy industry. Shape sensing is being considered as a potential means for obtaining global strain fields of complex structures. This is achieved through the use of inverse finite element...poster 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. G<sub>max</sub>, (Δ√G)<sup>2</sup>, or ΔG. In all cases it is usually observed that keeping the similitude parameter...journal article 2016
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Ochôa, Pedro (author), Villegas, I.F. (author), Groves, R.M. (author), Benedictus, R. (author)Ultrasonic welding is a very promising technique for joining thermoplastic composite (TpC) components in aircraft primary structures [1, 2]. The potential introduction of new lightweight structures in civil aviation has been driving the change towards condition-based maintenance (CBM) as an alternative to the regular inspection interval approach...abstract 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
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Zhao, T. (author), Palardy, G. (author), Villegas, I.F. (author), Rans, C.D. (author), Martinez, M.J. (author), Benedictus, R. (author)The in-plane and out-of-plane mechanical behaviour of both ultrasonically spot-welded and mechanically fastened joints was investigated by double-lap shear and pull-through tests, respectively. Spot-welded specimens showed comparable onset failure load and significantly higher joint stiffness compared to mechanical fasteners when carrying shear...journal article 2016
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Zhao, T. (author), Palardy, G. (author), Rans, C.D. (author), Benedictus, R. (author)Ultrasonic welding is a promising assembly technique for thermoplastic composites and it is well-suited for spot welding. In this paper, the in-plane and out-of-plane mechanical behaviour of ultrasonically spot-welded and mechanically fastened joints are investigated by double-lap shear and pull-through tests, respectively. Special attention was...conference paper 2016
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Zhang, Z. (author), Wang, W. (author), Rans, C.D. (author), Benedictus, R. (author)This paper provides an experimental investigation into the pin loading effects on the crack growth behaviour in Fibre Metal Laminates. The pin loading effects and bypass loading effects are incorporated in two different tested joints. The analysis of the test results shows that pin loading dominates the crack growth only in the vicinity of the...journal article 2016
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Eleftheroglou, N. (author), Zarouchas, D. (author), Loutas, T.H. (author), Alderliesten, R.C. (author), Benedictus, R. (author)The present study utilizes a state-of-the-art stochastic modeling with structural health monitoring (SHM) data derived from strain measurements, in order to assess the remaining useful life (RUL) online in composite materials under fatigue loading. Non-Homogenous Hidden Semi Markov model (NHHSMM) is a suitable candidate with a rich mathematical...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