Richard Butler
University of Bath
Composite numberUltimate tensile strengthAeroelasticityEngineeringFinite element methodComposite laminatesComposite materialAerospaceCompression (physics)Materials scienceDamage toleranceStiffnessMinimum massCompressive strengthMaterial propertiesStackingComputer scienceStructural engineeringDelaminationShear (sheet metal)BucklingWing
162Publications
21H-index
1,375Citations
Publications 152
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#1Anton Köllner (Imperial College London)H-Index: 5
#2Mark Nielsen (University of Bath)H-Index: 2
Last. Richard Butler (University of Bath)H-Index: 21
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Abstract Two state-of-the-art analytical compression after impact (CAI) modelling approaches are presented and evaluated for the problem of thin-film buckle-driven propagation of a delamination in composite laminates. Characteristic phenomena are investigated by evaluating the behaviour of the energy release rate of an anisotropic sublaminate above a 2D embedded delamination. These characteristics include extension-bend, shear-bend and bend-twist coupling as well as contact of sublaminate and ba...
2 CitationsSource
#1T.R.C. Chuaqui (University of Bath)H-Index: 1
#1T.R.C. Chuaqui (University of Bath)H-Index: 1
Last. Andrew Rhead (University of Bath)H-Index: 10
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Abstract The failure strength of carbon-fibre reinforced plastic laminates under open-hole tension varies considerably with ply angle, ply blocking and loading direction. Here, laminates with various standard-angle and non-standard angle stacking sequences are subjected to both on- and off-axis loading in a comprehensive experimental and progressive damage finite element analysis testing campaign. It is found that interlaminar and intralaminar matrix damage can be beneficial when accumulated sub...
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#1Timothy Dodwell (University of Exeter)H-Index: 13
#1T.J. Dodwell (The Turing Institute)
Last. Robert Scheichl (University of Bath)H-Index: 27
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Abstract By adopting a Multilevel Monte Carlo (MLMC) framework, this paper shows that only a handful of costly fine scale computations are needed to accurately estimate statistics of the failure of a composite structure, as opposed to the many thousands typically needed in classical Monte Carlo analyses. The paper introduces the MLMC method and provides an extension called MLMC with selective refinement to efficiently calculated structural failure probabilities. Simple-to-implement, self-adaptiv...
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#1T.R.C. Chuaqui (University of Bath)H-Index: 1
#1T.R.C. Chuaqui (University of Bath)H-Index: 1
Last. Richard Butler (University of Bath)H-Index: 21
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Abstract The certification and quality control of large aerostructures relies on testing of small-scale coupons, which may be unrepresentative of the final product. Edge effects, which are either non-existent or less significant in large aerospace components, cause coupon failure and often lead to considerable strength underpredictions. In this work, a resin treatment is applied to the edges of short beam specimens, resulting in a net strength improvement of 16% and 36% in laminates using two ca...
1 CitationsSource
#1Zsombor Sápi (University of Bath)H-Index: 2
#2Richard Butler (University of Bath)H-Index: 21
Abstract This paper reviews the literature published since 1994 related to the behaviour of composite materials at low and cryogenic temperatures. The material properties addressed are: tensile, compressive and shear strength, elastic modulus and stress-strain behaviour; mechanical and thermal fatigue response; fracture toughness; impact resistance; thermal expansion and thermal conductivity; tribology and wear; permeability. The underlying physical principles responsible for the behaviour at co...
2 CitationsSource
#1Richard Butler (University of Bath)H-Index: 21
#2Timothy Dodwell (University of Exeter)H-Index: 13
Last. Linus Seelinger (Heidelberg University)H-Index: 2
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Abstract The key innovation in this paper is an open-source, high-performance iterative solver for high contrast, strongly anisotropic elliptic partial differential equations implemented within dune-pdelab . The iterative solver exploits a robust, scalable two-level additive Schwarz preconditioner, GenEO (Spillane et al., 2014). The development of this solver has been motivated by the need to overcome the limitations of commercially available modeling tools for solving structural analysis simula...
2 CitationsSource
#1Lucie Culliford (University of Bath)H-Index: 1
#2R.S. Choudhry (University of Derby)H-Index: 6
Last. Andrew Rhead (University of Bath)H-Index: 10
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Abstract Continuous variation of stiffness across flat plates has been shown, theoretically, to improve buckling performance by up to 60%. However, steered fibre manufacturing methods cannot achieve the minimum radius of curvature required for improvement whilst maintaining a high deposition rate. An alternative concept, Discrete Stiffness Tailoring (DST), which varies stiffness within a ply through discrete changes of angle, is compatible with high rate deposition methods such as Advanced Tape ...
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#1Zsombor Sápi (University of Bath)H-Index: 2
#2Sam Hutchins (GKN)H-Index: 1
Last. Andrew Rhead (University of Bath)H-Index: 10
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Abstract In the manufacture of the out-of-plane joints of composite stiffened panels, such as the connection between skin and T, I, omega shaped stiffeners, a filler material is needed to fill the void between the flanges, web and skin. The most common filler is a rolled unidirectional prepreg tape (“noodle”), which is not only expensive to manufacture, but also has low strength that can lead to premature failure of the loaded joint. In this work, eight novel filler concepts are introduced and e...
1 CitationsSource
#1Zsombor Sápi (University of Bath)H-Index: 2
#2Richard Butler (University of Bath)H-Index: 21
Last. Andrew Rhead (University of Bath)H-Index: 10
view all 3 authors...
Abstract Composite T-joints and similar skin-stiffener joints have a central role in aerospace structures. However, their accurate numerical analysis is still a great challenge due to their complex geometry and stress state during loading. In this work, an experimentally validated high-fidelity finite element model is developed to simulate the failure of a T-joint subjected to tensile loading. For the first time in literature, the model accounts for the shape of the manufactured filler, ply thic...
3 CitationsSource