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• Conference paper
  Behzadi-Sofiani B, Gardner L, Wadee MA, 2022,

  Numerical simulation and design of steel equal-leg angle section beams

  , 8th International Conference on Structural Engineering, Mechanics and Computation (SEMC), Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 327-328
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• Journal article
  Bai L, Wadee MA, Köllner A, Yang Jet al., 2021,

  Variational modelling of local-global mode interaction in long rectangular hollow section struts with Ramberg-Osgood type material nonlinearity

  , International Journal of Mechanical Sciences, Vol: 209, ISSN: 0020-7403

  A variational model describing the nonlinear mode interaction in thin-walled box-section struts under pure axial compression made from a nonlinear material obeying the Ramberg–Osgood law is presented. The formulation combines continuous displacement functions and generalized coordinates, leading to the derivation of a system of differential and integral equations that describe the static equilibrium response of the strut. Solving the system of equations using numerical continuation techniques reveals the strongly unstable post-buckling response arising from combined geometrical and material nonlinearities during the interactive buckling of the global and local buckling modes—the resulting behaviour being more unstable with decreasing material hardening. A finite element (FE) model is also devised and reveals very similar post-buckling behaviour as highlighted in the variational model. The results compare very well in terms of the mechanical destabilization and the post-buckling deformation, which verifies the analytical model.

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• Journal article
  Kyvelou P, Slack H, Daskalaki Mountanou D, Wadee MA, Britton T, Buchanan C, Gardner Let al., 2020,

  Mechanical and microstructural testing of wire and arc additively manufactured sheet material

  , Materials and Design, Vol: 192, ISSN: 0264-1275

  Wire and arc additive manufacturing (WAAM) is a method of 3D printing that enables large elements to be built, with reasonable printing times and costs. There are, however, uncertainties relating to the structural performance of WAAM material, including the basic mechanical properties, the degree of anisotropy, the influence of the as-built geometry and the variability in response. Towards addressing this knowledge gap, a comprehensive series of tensile tests on WAAM stainless steel was conducted; the results are presented herein. As-built and machined coupons were tested to investigate the influence of the geometrical irregularity on the stress-strain characteristics, while material anisotropy was explored by testing coupons produced at different angles to the printing orientation. Non-contact measurement techniques were employed to determine the geometric properties and deformation fields of the specimens, while sophisticated analysis methods were used for post processing the test data. The material response revealed a significant degree of anisotropy, explained by the existence of a strong crystallographic texture, uncovered by means of electron backscatter diffraction. Finally, the effective mechanical properties of the as-built material were shown to be strongly dependent on the geometric variability; simple geometric measures were therefore developed to characterise the key aspects of the observed behaviour.

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• Journal article
  Champneys AR, Dodwell TJ, Groh RMJ, Hunt GW, Neville RM, Pirrera A, Sakhaei AH, Schenk M, Wadee MAet al., 2019,

  Happy catastrophe: Recent progress in analysis and exploitation of elastic instability

  , Frontiers in Applied Mathematics and Statistics, Vol: 5, Pages: 1-30, ISSN: 2297-4687

  A synthesis of recent progress is presented on a topic that lies at the heart of both structural engineering and nonlinear science. The emphasis is on thin elastic structures that lose stability subcritically — without a nearby stable post-buckled state — a canonical example being a uniformly axially-loaded cylindrical shell. Such structures are hard to design and certify because imperfections or shocks trigger buckling at loads well below the threshold of linear stability. A resurgence of interest in structural instability phenomena suggests practical stability assessment require stochastic approaches and imperfection maps. This article surveys a different philosophy; the buckling process and ultimate post-buckled state are well described by the perfect problem. The significance of the Maxwell load is emphasised, where energy of the unbuckled and fully developed buckle patterns are equal, as is the energetic preference of localised states, stable and unstable versions of which connect in a snaking load-deflection path. The state of the art is presented on analytical, numerical and experimental methods. Pseudo15 arclength continuation (path-following) of a finite-element approximation computes families of complex localised states. Numerical implementation of a mountain-pass energy method then predicts the energy barrier through which the buckling process occurs. Recent developments also indicate how such procedures can be replicated experimentally; unstable states being accessed by careful control of constraints, and stability margins assessed by shock sensitivity experiments. Finally, the fact that subcritical instabilities can be robust, not being undone by reversal of the loading path, opens up potential for technological exploitation. Several examples at different length scales are discussed; a cable-stayed prestressed column, two examples of adaptive structures inspired by morphing aeroelastic surfaces, and a model for a functional auxetic material.

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• Journal article
  Gibson D, Anand V, Dehlinger J, Dierbach C, Emmersen T, Phillips Aet al., 2019,

  Accredited Undergraduate Cybersecurity Degrees: Four Approaches

  , COMPUTER, Vol: 52, Pages: 38-47, ISSN: 0018-9162
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  • Citations: 2
• Conference paper
  Raj RK, Anand V, Gibson D, Kaza S, Phillips Aet al., 2019,

  Cybersecurity Program Accreditation: Benefits and Challenges

  , 50th ACM-SIGCSE Technical Symposium on Computer Science Education (SIGCSE), Publisher: ASSOC COMPUTING MACHINERY, Pages: 173-174
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  • Citations: 2
• Conference paper
  Spaccasassi C, Yordanov B, Phillips A, Dalchau Net al., 2019,

  Fast Enumeration of Non-isomorphic Chemical Reaction Networks

  , 17th International Conference on Computational Methods in Systems Biology (CMSB), Publisher: SPRINGER INTERNATIONAL PUBLISHING AG, Pages: 224-247, ISSN: 0302-9743
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  • Citations: 1
• Journal article
  Dalchau N, Szep G, Hernansaiz-Ballesteros R, Barnes CP, Cardelli L, Phillips A, Csikasz-Nagy Aet al., 2018,

  Computing with biological switches and clocks

  , NATURAL COMPUTING, Vol: 17, Pages: 761-779, ISSN: 1567-7818
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  • Citations: 33
• Journal article
  Lakin MR, Phillips A, 2018,

  Automated analysis of tethered DNA nanostructures using constraint solving

  , NATURAL COMPUTING, Vol: 17, Pages: 709-722, ISSN: 1567-7818
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  • Citations: 4
• Journal article
  Bai L, Yang J, Wadee MA, 2018,

  Cellular buckling from nonlinear mode interaction in unequal-leg angle struts

  , Thin-Walled Structures, Vol: 132, Pages: 316-331, ISSN: 0263-8231

  A variational model based on total potential energy principles that describes the nonlinear mode interaction in thin-walled unequal-leg angle struts under pure axial compression is presented. The formulation, which combines continuous displacement functions and generalized coordinates, leads to the derivation of a system of differential and integral equations that describe the static equilibrium response of the strut. Solving the system of equations using numerical continuation techniques reveals, for the first time, progressive cellular buckling (or snaking) represented by a sequence of snap-back instabilities arising from the nonlinear interaction of the weak-axis flexural, strong-axis flexural and torsional buckling modes—the resulting behaviour being highly unstable. For verification purposes, a finite element (FE) model is also devised and the sequential snap-back instabilities are also captured within its framework. Moreover, once an initial geometric perturbation is incorporated within the variational model it compares very well with the FE model.

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