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XUN, L. (author), Mosleh, Yasmine (author), Sun, Baozhong (author), Pascoe, J.A. (author), Gu, Bohong (author)3-D braided composites are a promising material for manufacturing tubular structures. However, a thorough understanding of their damage mechanisms under torsion is required to maximize their potential applications. The present work constructed a multiscale equivalent model, integrating mesoscopic and homogeneous structures to reveal torsional...journal article 2024
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Biagini, D. (author), Pascoe, J.A. (author), Alderliesten, R.C. (author)Although several studies have been performed, the compression after impact (CAI) failure of CFRP is still not entirely understood. It is still unclear what sequence of events determines the onset of failure in CAI tests and how the different damage modes are involved in this process. To experimentally investigate this matter, the present work...journal article 2023
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Zheng, T. (author), Guo, Licheng (author), Sun, Ruijian (author), Wang, Tongtong (author), Hong, Changqing (author), Benedictus, R. (author), Pascoe, J.A. (author)In this paper, the effect of interface properties on the compressive failure behavior of 3D woven composites (3DWC) is investigated by incorporating a micromechanics-based multiscale damage model (MMDM). The correlation between the mesoscopic stress of yarns and microscopic stress of constituents is established by defining a stress...journal article 2023
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Biagini, D. (author), Pascoe, J.A. (author), Alderliesten, R.C. (author)In previous literature, a plateau phase in fatigue growth of impact delamination projected area in CFRP was found. Explaining this plateau phase still represents a knowledge gap. In the present work, echo-pulse and through thickness transmission ultrasonic scan inspections were combined with acoustic emission monitoring to explain this...journal article 2023
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Brunner, A.E. (author), Alderliesten, R.C. (author), Pascoe, J.A. (author)Quasi-static or cyclic loading of an artificial starter crack in unidirectionally fibre-reinforced composite test coupons yields fracture mechanics data—the toughness or strain-energy release rate (labelled G)—for characterising delamination initiation and propagation. Thus far, the reproducibility of these tests is typically between 10 and...journal article 2023
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Zheng, T. (author), Guo, Licheng (author), Benedictus, R. (author), Pascoe, J.A. (author)A novel micromechanics-based multiscale progressive damage model, employing minimal material parameters, is proposed in this paper to simulate the compressive failure behaviours of 3D woven composites (3DWC). The highly realistic constructions of microscopic and mesoscopic representative volume cells are accomplished, and a set of strain...journal article 2022
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Zheng, T. (author), Guo, Licheng (author), Wang, Zhenxin (author), Benedictus, R. (author), Pascoe, J.A. (author)In this paper, a reliable progressive fatigue damage model (PFDM) for predicting the fatigue life of composite laminates is proposed by combining the normalized fatigue life model, nonlinear residual degradation models and fatigue-improved Puck criterion. To balance the accuracy of life predictions and computational efficiency, an adaptive...journal article 2022
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Pascoe, J.A. (author)Using the slow-growth certification approach for damage tolerance of composite aircraft structures has the potential to reduce their weight. Applying this approach requires that damage growth is slow, stable, and predictable. However, currently available methods do not allow for sufficiently accurate predictions, due to knowledge gaps related...journal article 2021
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Keller, A. (author), Geissberger, R. (author), Studer, J. (author), Leone, F. (author), Stefaniak, D. (author), Pascoe, J.A. (author), Dransfeld, C.A. (author), Masania, K. (author)The effect of ply thickness on the notch sensitivity and bearing properties on carbon fibre reinforced polymer composites and their hybrid laminates with steel foils were studied. Laminates with ply thicknesses of 0.3 mm and 0.03 mm comprising of CFRP and hybrid laminates were manufactured and characterized using tension, open hole tension...journal article 2021
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Pascoe, J.A. (author), Zavatta, N. (author), Troiani, E. (author), Alderliesten, R.C. (author)The effect of adhesive thickness on fatigue crack growth in an epoxy film adhesive (FM94) was investigated, using a combination of experiments and numerical modelling. For the range of thicknesses investigated an increased thickness led to an increased crack growth rate. It was found that the energy required per unit of crack growth did not...journal article 2020
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Pascoe, J.A. (author)Impact damage in CFRP structures is currently managed using the ‘no-growth’ concept, meaning that damage is not allowed to grow under fatigue loading. This requires that stresses in the material are kept below the fatigue limit, imposing a significant weight penalty. A ‘slow-growth’ concept would allow more efficient structural designs, but...journal article 2020
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Pascoe, J.A. (author), Zarouchas, D. (author), Alderliesten, R.C. (author), Benedictus, R. (author)Current methods for prediction of fatigue crack growth are based on empirical correlations which do not take the crack growth behaviour within a single cycle into account. To improve these prediction methods, more understanding of the physical mechanisms of crack growth is required. In this research the acoustic emission technique was used to...journal article 2018
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Deutz, D.B. (author), Pascoe, J.A. (author), Schelen, J.B.J. (author), van der Zwaag, S. (author), de Leeuw, D.M. (author), Groen, W.A. (author)Piezoelectric energy harvesters are at the front of scientific research as enablers of renewable, sustainable energy for autonomous wireless sensor networks. Crucial for this disruptive technology is the achievable output power. Here we show, analytically, that the maximum output energy per unit volume, under a single sinusoidal excitation,...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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Alderliesten, R.C. (author), Brunner, A. J. (author), Pascoe, J.A. (author)Where for metallic materials fatigue fracture testing has contributed significantly to understanding macroscopic and microscopic fatigue failure, the understanding of fatigue fracture in fibre reinforced polymers (FRP) still seems limited. It appears that the research on fatigue in FRPs raises more questions, rather than providing a framework...journal article 2018
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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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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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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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Pascoe, J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)An overview is given of the development of methods for the prediction of fatigue driven delamination growth over the past 40 years. Four categories of methods are identified: stress/strain-based models, fracture mechanics based models, cohesive-zone models, and models using the extended finite element method. It is highlighted that most models...journal article 2013