ORCID Profile
0000-0002-3979-769X
Current Organisations
University of Sheffield
,
University of Adelaide
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Publisher: Elsevier BV
Date: 04-2019
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.393
Abstract: Carbon Sequestration by CO2 storage into deep geological formations is a short to mid-term component for mitigatingclimate change while maintaining the stability of the world’s energy systems. This storage procedure will result in a seriesof coupled physical and chemical processes within the geological formation, which may critically affect its integrityas a storage medium. This work presents the development of a finite element model, which is to collaboratively aiddesign, monitoring and risk assessment. The current emphasis of the model development is on ensuring that the inducedgeomechanical behaviour is acceptable within a given reservoir-caprock system. It is a Biot-type model, whereby theinteractions of the flow of the fluids and the mechanical behaviour of the porous media are fully coupled. The governingequations are outlined and solved using numerical methods. For assessment, a simplified benchmark storage scenario ismodelled with realistic parametrisation.
Publisher: Elsevier BV
Date: 2012
Publisher: Thomas Telford Ltd.
Date: 09-2021
Abstract: The coupling of chemically induced degradation and mechanical damage is fundamental to investigate the durability of load-bearing cement-based materials subject to aggressive environments. This study is devoted to the incorporation of a reactive transport model and non-local damage model to integrate the complete process of chemical degradation and appropriate propagation of mechanical damage in the framework of coupled chemo-mechanical degradation. The chemical degradation of cement-based materials subject to leaching solution is principally concluded as the dissolution of portlandite and decalcification of C–S–H, and the reduction of Young's modulus is evaluated based on the microstructure of cement-based materials by the Mori–Tanaka scheme. The displacement-based non-local damage model is incorporated to capture the post-peak behaviour of the leached mortar beam in three-point bending test. The significance of coupling chemical and mechanical damage for the degraded beam is demonstrated by comparing the fully coupled damage with outcomes of the non-coupled case.
Publisher: Springer Science and Business Media LLC
Date: 25-06-2015
Publisher: Springer Science and Business Media LLC
Date: 13-07-2006
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2016
Publisher: Elsevier BV
Date: 03-2017
Publisher: Thomas Telford Ltd.
Date: 09-2013
Abstract: Empirical prediction methods are often used in the early stages of design to quantify the blast load acting on a structure. While these methods are reasonably accurate for geometrically simple scenarios, they may not be accurate for situations where the target does not form a reflecting surface of effectively infinite lateral extent. In this case, the blast wave will diffract around the target edge, leading to the propagation of a relief wave inwards from the edge of the structure, reducing the late-time development of pressure in a process known as ‘clearing'. This paper presents results from a study undertaken to determine the influence of clearing on the response of simple targets. Experiments were conducted in which deflection–time histories were recorded for target plates subjected to cleared and non-cleared blast loads. These were compared with predictions from explicit dynamic finite-element and single-degree-of-freedom models, in which the blast loading was derived by applying a simple correction to the empirical blast prediction method. The results presented show that neglecting clearing may result in highly conservative predictions of target response and that analyses using loading derived from simple corrections to the ConWep predictions match the experimentally observed results very closely.
Publisher: SAGE Publications
Date: 09-2014
DOI: 10.1260/2041-4196.5.3.253
Abstract: When a blast wave strikes a finite target, diffraction of the blast wave around the free edge causes a rarefaction clearing wave to propagate along the loaded face and relieve the pressure acting at any point it passes over. For small targets, the time taken for this clearing wave to traverse the loaded face will be small in relation to the duration of loading. Previous studies have not shown what happens in the late-time stages of clearing relief, nor the mechanism by which the cleared reflected pressure decays to approach the incident pressure. Current design guidance assumes a series of interacting clearing waves propagate over the target face – this assumption is tested in this article by using numerical analysis to evaluate the blast pressure acting on small targets subjected to blast loads. It is shown that repeat propagations of the rarefaction waves do not occur and new model is proposed, based on an over-expanded region of air in front of the loaded face of the target.
Publisher: Wiley
Date: 22-07-2013
DOI: 10.1111/FFE.12066
Publisher: Trans Tech Publications, Ltd.
Date: 07-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.82.81
Abstract: Cardboard honeycomb energy dissipating material (EDM) is used extensively forprotection of cargo that is air dropped. Whilst air dropped containers are deployed withparachutes, a significant amount of energy still requires dissipating on impact with the ground.The specification of cardboard EDM in dynamic applications has tended to be ad-hoc withno thorough understanding of the energy absorbing characteristics of the material. This paperseeks to address this gap in knowledge.
Publisher: Wiley
Date: 06-09-2006
DOI: 10.1002/NAG.551
Publisher: Elsevier BV
Date: 02-2019
Publisher: Informa UK Limited
Date: 03-07-2018
Publisher: Elsevier BV
Date: 11-2018
Publisher: SAGE Publications
Date: 03-2014
Abstract: Following the positive phase of a blast comes a period where the pressure falls below atmospheric pressure known as the negative phase. Whilst the positive phase of the blast is well understood, validation of the negative phase is rare in the literature, and as such it is often incorrectly treated or neglected altogether. Herein, existing methods of approximating the negative phase are summarised and recommendations of which form to use are made based on experimental validation. Also, through numerical simulations, the impact of incorrectly modelling the negative phase has been shown and its implications discussed.
Publisher: Elsevier BV
Date: 12-2014
Publisher: Wiley
Date: 2007
DOI: 10.1002/NME.2017
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 03-2022
Publisher: Trans Tech Publications, Ltd.
Date: 07-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.82.669
Abstract: The total impulse imparted to a target by an impinging blast wave is a key loading parameter for the design of blast-resistant structures and façades. Simple, semi-empirical approaches for the prediction of blast impulse on a structure are well established and are accurate in cases where the lateral dimensions of the structure are sufficiently large. However, if the lateral dimensions of the target are relatively small in comparison to the length of the incoming blast wave, air flow around the edges of the structure will lead to the propagation of rarefaction or clearing waves across the face of the target, resulting in a premature reduction of load and hence, a reduction in the total impulse imparted to the structure. This effect is well-known semi-empirical models for the prediction of clearing exist, but several recent numerical and experimental studies have cast doubt on their accuracy and physical basis. In fact, this issue was addressed over half a century ago in a little known technical report at the Sandia Laboratory, USA. This paper presents the basis of this overlooked method along with predictions of the clearing effect. These predictions, which are very simple to incorporate in predictions of blast loading, have been carefully validated by the current authors, by experimental testing and numerical modelling. The paper presents a discussion of the limits of the method, concluding that it is accurate for relatively long stand-off blast loading events, and giving some indication of improvements that are necessary if the method is to be applicable to shorter stand-off cases.
Publisher: Springer Science and Business Media LLC
Date: 26-02-2011
Publisher: Springer Science and Business Media LLC
Date: 11-2007
Publisher: Elsevier BV
Date: 05-2017
Publisher: Springer Netherlands
Date: 2007
Publisher: Elsevier BV
Date: 12-2010
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 06-2022
Publisher: SAGE Publications
Date: 12-2014
DOI: 10.1260/2041-4196.5.4.367
Abstract: Due to the threat of terrorist activities worldwide, research on the protection of building structures from the effects of explosions is critical in order to avoid catastrophic damage to buildings. Protecting our infrastructures means protecting lives. Metallic foam is an economical, light-weight and recyclable material used as a sacrificial cladding to protect structures. Its efficient energy absorption enables metallic foam to mitigate the blast energy acting on the protected structure. This paper describes our numerical investigation of the protective performance of metallic foam cladding on reinforced concrete (RC) structural members using LS-DYNA. In the numerical model, Modified Honeycomb (Material 126) from the LS-DYNA material library was used to represent the aluminium foam while Continuous Surface Cap Model (Material 159) was selected to model the behaviour of concrete. The numerical model was validated by field blast testing results. Using the validated numerical model, parametric studies were conducted to assess the influence of different foam properties on the pressure-impulse (P-I) diagrams of the foam-protected RC slabs. The influence of the thickness of the RC members was also investigated. The derived P-I diagrams will prove useful in the preliminary design of the foam cladding on RC members.
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2020
Publisher: Springer Science and Business Media LLC
Date: 21-11-2008
Publisher: Elsevier BV
Date: 07-2008
Publisher: SAGE Publications
Date: 17-08-2017
Abstract: Aluminium foam is widely known as an energy absorptive material which can be used as a protective cladding on structures to enhance blast resistance of the protected structures. Previous studies show that higher density provides larger energy absorption capacity of aluminium foam, but results in a larger transmitted pressure to the protected structure. To lower the transmitted pressure without sacrificing the maximum energy absorption, graded density foam has been examined in this study. An analytical model is developed in this article to investigate the protective effect of linear density foam on response of a structure under blast loading. The model is able to simulate structural deformation with reasonable accuracy compared with experimental data. The sensitivity of density gradient of foam cladding on reinforced concrete structure is tested in the article.
Publisher: Elsevier BV
Date: 04-2014
Publisher: Editorial CSIC
Date: 22-03-2017
Abstract: Fracture of steel-fibre-reinforced-concrete occurs mostly in the form of a smeared crack band undergoing progressive microcracking. For FE modelling and design purposes, this crack band could be characterised by a stress-strain (σ-ε) relationship. For industrially-produced steel fibres, existing methodologies such as RILEM TC 162-TDF (2003) propose empirical equations to predict a trilinear σ-ε relationship directly from bending test results. This paper evaluates the accuracy of these methodologies and their applicability for roller-compacted-concrete and concrete incorporating steel fibres recycled from post-consumer tyres. It is shown that the energy absorption capacity is generally overestimated by these methodologies, sometimes up to 60%, for both conventional and roller-compacted concrete. Tensile behaviour of fibre-reinforced-concrete is estimated in this paper by inverse analysis of bending test results, examining a variety of concrete mixes and steel fibres. A multilinear relationship is proposed which largely eliminates the overestimation problem and can lead to safer designs.
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 04-2018
Publisher: Thomas Telford Ltd.
Date: 03-2012
DOI: 10.1680/EACM.2012.165.1.41
Abstract: Wave dispersion is a widely recognised phenomenon that occurs when elastic waves propagate through a heterogeneous microstructured material reflection and refraction of higher frequencies leads to an apparent reduction of the wave speed with frequency. Enhanced continua are frequently employed to capture this phenomenon efficiently. Numerical experiments are performed in this paper to establish a procedure for the determination of the length scale parameters used in dynamic gradient elasticity using spectral analysis. Suitable values of the length scale parameters are determined and verified for a one-dimensional laminated bar and for a two-dimensional chequerboard plate.
Publisher: Elsevier BV
Date: 05-2011
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Terry Bennett.