Journal: Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics

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Publisher

Telford

Journal Volumes

ISSN

1755-0777
1755-0785

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2018 - 201912020 - 20211
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Publications1 - 2 of 2
  • High-fidelity non-linear analysis of metal sandwich panels
    Item type: Journal Article
    Nordas, Alexandros; Santos, Luis; Izzuddin, Bassam A.; et al. (2018)
    Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics
    The considerably superior specific strength and stiffness of sandwich panels in relation to conventional structural components makes their employment for two-way spanning structural applications a highly attractive option. An effective high-fidelity numerical modelling strategy for large-scale metal sandwich panels is presented in this paper, which enables the capturing of the various forms of local buckling and its progression over the panel domain, alongside the effects of material non-linearity and the spread of plasticity. The modelling strategy is further enhanced with a novel domain-partitioning methodology, allowing for scalable parallel processing on high-performance computing distributed memory systems. Partitioned modelling achieves a substantial reduction of the wall-clock time and computing memory demand for extensive non-linear static and dynamic analyses, while further overcoming potential memory bottlenecks encountered when conventional modelling and solution procedures are employed. A comparative evaluation of the speed-up achieved using partitioned modelling, in relation to monolithic models, is conducted for different levels of partitioning. Finally, practical guidance is proposed for establishing the optimal number of partitions offering maximum speed-up, beyond which further partitioning leads to excesses both in the non-linear solution procedure and the communication overhead between parallel processors, with a consequent increase in computing time.
  • Understanding the rigid-block equilibrium method by way of mathematical programming
    Item type: Journal Article
    Kao, Gene Ting-Chun; Iannuzzo, Antonino; Coros, Stelian; et al. (2021)
    Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics
    This paper discusses and extends some main features of the rigid-block equilibrium (RBE) method. RBE is a numerical approach that frames the equilibrium problem of rigid-block assemblies as an optimisation problem to compute possible internal and equilibrated singular stress states. The contact between blocks is considered having a finite friction capacity and the unilateral behaviour is modelled through a penalty formulation. In particular, the penalty formulation widens the standard admissible solution space of compressive-only forces by allowing for tensile forces appearing on potentially unstable regions. The RBE objective function minimises the interface forces whereas the constraints are linear functions enforcing the static equilibrium of the whole assembly. In this paper, along with the original quadratic objective function, the authors propose a linear function to illustrate and explore the role played by both the nodal forces and the interface resultants. Moreover, the authors show how RBE can be used to explore different admissible internal stress states - for example, due to increasing, static, horizontal actions.
Publications1 - 2 of 2