ORCID Profile
0000-0003-3883-7757
Current Organisation
Deakin University
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Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 12-2008
Publisher: Springer Science and Business Media LLC
Date: 25-06-2015
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 08-2016
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 10-2010
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 2013
Publisher: Springer US
Date: 2009
Publisher: Elsevier BV
Date: 2008
Publisher: Elsevier BV
Date: 07-2009
Publisher: Elsevier BV
Date: 12-2008
Publisher: Elsevier
Date: 2017
Publisher: American Society of Mechanical Engineers
Date: 14-04-2019
DOI: 10.1115/HVIS2019-040
Abstract: A high hardness armour steel (HHA) has been subjected to mechanical characterization under tension, compression, and shear loading at quasi-static and dynamic rates incorporating ambient and elevated temperatures. The resulting data has been used to derive constants for four plasticity constitutive models: Johnson-Cook (JC), Zerilli-Armstrong (ZA), modified Johnson-Cook (MJC), and a generalized J2-J3 yield surface (GYS). The resulting models have been used to predict the response of the HHA material during Taylor rod-on-anvil experiments. High speed photography and digital image correlation was used during the rod-on-anvil experiments to capture both transient deformation profiles and maximum principal strain along the surface of the rod (i.e. compression along the length of the rod). The JC, MJC, and GYS models were found to provide the best prediction of the shape of the rod (nose diameter and length), within 2% of the experimental measurement in all four rod-on-anvil experiments which did not result in fracture. The JC and GYS models, furthermore, were found to provide the best agreement with the measured transient surface strain profiles, predicting the experimental measurement to within 10% at all measurement locations and time steps for the experiment resulting in maximum deformation (impact velocity = 208 m/s). The results suggest that the added complexity of models such as the MJC and GYS, which incorporate strain hardening saturation, two-part strain rate dependency, and J3 plasticity effects, are unnecessary for HHA under the loading conditions experienced during rod-on-anvil experiments.
Publisher: Elsevier BV
Date: 09-2021
Publisher: American Society of Mechanical Engineers
Date: 14-04-2019
DOI: 10.1115/HVIS2019-041
Abstract: A series of Taylor rod-on-anvil experiments have been performed to validate the predicted impact velocity fracture threshold and fracture mode of a high hardness armour steel (HHA) obtained through explicit finite element simulations. Experimentally, the rods exhibited principal shear failure, a condition that can be closely linked to adiabatic shear band (ASB) formation in high strength steel. Using a stress triaxiality and Lode angle dependent failure strain criterion (Basaran 3D fracture locus), calibrated from quasi-static mechanical characterisation tests, the simulations were unable to predict the onset of fracture observed in experiments. As such, a strength-fading criterion is proposed using a phenomenological description to capture the loss of load-carrying capacity resulting from ASB formation. The ASB criterion is based on an exponential fit to experimentally-observed instability strains measured at different average stress triaxialities in a series of tests on inclined cylindrical and modified flat-hat specimens. With the prediction of ASB formation the material strength is reduced to model the thermal softening experienced in the shear band, and fracture of the material (in the form of element erosion) remains controlled by the Basaran fracture model. Incorporating the ASB-based criterion, the numerical models were found to accurately predict both the impact velocity fracture threshold, as well as the general appearance of the observed principal shear fracture. The proposed criterion enables the effects of ASB formation to be captured in an impact simulation with little increase in computational cost.
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 12-2008
Publisher: Elsevier BV
Date: 12-2008
Publisher: American Society of Mechanical Engineers
Date: 14-04-2019
DOI: 10.1115/HVIS2019-046
Abstract: Ultra-high molecular weight polyethylene (UHMW-PE) composite has been shown to be an effective material for ballistic protection against blunt penetrators [1]. The material exhibits multiple stages of penetration, typically characterised by an initial local penetration phase followed by large bulge deformation of the back face [2]. The location at which transition occurs between the localised penetration stage and non-localised bulging stage is an important property of UHMW-PE composite armour. However, the conditions required to induce transition are poorly understood with a range of different mechanisms proposed to explain the behaviour [2,3], none of which can be used to predict the transition location within the target.
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 02-2013
Publisher: Elsevier
Date: 2017
Publisher: Elsevier BV
Date: 06-2013
Publisher: Elsevier BV
Date: 09-2011
Publisher: ASME International
Date: 12-04-2019
DOI: 10.1115/1.4043258
Abstract: Water-filled containers placed externally on an armored vehicle offer a potentially low cost, light-weight, and simple technique to mitigate near-field explosive blast, although the use of a gap or standoff between the container and target has not been studied. This paper uses experimental testing and numerical simulations to characterize the influence of this container standoff on the mitigation of near-field blast effects. The addition of the container standoff was not found to generally increase the blast mitigation effect provided by water-filled containers on the deformation caused to a steel target plate. While the container standoff was found to enhance the spreading and shadowing blast mitigation mechanisms provided by the water-filled container, this was offset by an increase in blast loading due to the container being closer to the explosive charge. A new mitigation mechanism was identified as the time delay between the initial loading of the steel plate by the blast wave and the subsequent impact of water ejected from the container. The results from this work provide engineers guidance into the design of water-filled containers for near-field blast protection of armored vehicles.
Publisher: AIP
Date: 2009
DOI: 10.1063/1.3295076
Publisher: Elsevier BV
Date: 2015
No related grants have been discovered for Shannon Ryan.