Latest Discoveries

Results 16 to 20 of 20.

  • Dynamic deformation

    Energy absorption in lattice structures in dynamics: Experiments

    Authors: Z. Ozdemir, E. Hernandez-Nava, A. Tyas, J.A. Warren, S.D. Fay, R. Goodall, I. Todd, H. Askes. 

    Lattice structures offer the potential to relatively easily engineer specific (meso-scale properties (cell level)), to produce desirable macro-scale material properties for a wide variety of engineering applications including wave filters, blast and impact protection systems, thermal insulation, structural aircraft and vehicle components, and body implants. The work presented here focuses on characterising the quasi-static and, in particular, the dynamic load-deformation behaviour of lattice samples.

    This article is located on a different website.

  • CoBL

    On backward dispersion correction of Hopkinson pressure bar signals

    Authors: A. Tyas, Z. Ozdemir

    This paper aims to characterise the quasi-static and dynamic behaviour of lattices under high-strain rates using quasi-static compression and Hopkinson Pressure Bar (HPB) tests. To the best of authors knowledge, this is the first research to experimentally investigate the dynamic response of re-entrant and diamond lattices.

    In addition, existing experimental studies on the dynamic response of lattices mainly measures a response parameter at a specific time, whereas this study provides crucial information on the dynamic response of lattices over the impact duration.

    This article is located on a different website.

  • POTM

    Limit analysis of reinforced embankments on soft soil

    Authors: C.C. Smith, A. Tatari.

    The paper presents the first comprehensive computational limit analysis parametric study of reinforced embankments on soft soil, identifying a new failure mode and significantly extending previous studies that examined single failure modes only. The results are presented in a new concise form of design chart that should allow more efficient design. 

    This article is located on a different website.

  • Mulit

    Benchmarking a multiresolution discontinuous Galerkin shallow water model

    Authors: D. Caviedes-Voullième, G. Kesserwani.

    This paper aims to validate a new interdisciplinary theory in the flood modelling context, to address contemporary problems in computational hydraulics.

    It has built upon the collaborative work undertaken with mathematician RWTH Aachen (during a DAAD visiting fellowship A-13-72-005), and was preceded by two computational journal paper (J. Comput. Phys., 301, 265–288; Comput. Methods Appl. Mech. Engrg., 294, 56–71).

    It provides a leap forward to jointly address the inevitable trade-off between modelling accuracy and efficiency, while comprehensively accommodating the multiplicity, variability and inter-connectivity of the physical-length scales involved in flooding across large domains.

    This article is located on a different website.

  • Leaky pipes

    Experimental Quantification of Contaminant Ingress into a Buried Leaking Pipe during Transient Event

    Authors: S. Fox, W. Shepherd, R. Collins, J. Boxall.

    It has been hypothesized that negative pressures caused by transients within water distribution systems may result in ingress of contaminated groundwater through leaks and hence pose a risk to public health.

    This paper presents results of contaminant ingress experiments from a novel laboratory facility at The University of Sheffield. An engineered leak surrounded by porous media was subjected to pressure transients resulting from the rapid closure of an upstream valve. It has been shown that a pollutant originating externally was drawn in and transported to the end of the pipe loop. This paper thus presents the first fully representative results proving the occurrence and hence, risk to potable water quality of contaminant ingress. 

    This paper was picked up widely by the mainstream media and helped to bring to wider public attention the risks of contamination in water supply systems.

    This article is located on a different website.