A5010802213- Structural Response to Dynamic Loads
- High-Velocity Impact and Material Behavior
- Combustion and Detonation Processes
- Energetic Materials and Combustion
- Topology Optimization in Engineering
- Transportation Safety and Impact Analysis
- Geophysical Methods and Applications
- Structural Analysis and Optimization
- Engineering and Material Science Research
- Structural Engineering and Vibration Analysis
- Fire effects on concrete materials
- Composite Structure Analysis and Optimization
- Structural Load-Bearing Analysis
- Fluid Dynamics Simulations and Interactions
- Structural Behavior of Reinforced Concrete
- Innovative concrete reinforcement materials
- BIM and Construction Integration
- Electromagnetic Launch and Propulsion Technology
- Laser-Plasma Interactions and Diagnostics
- Ultrasonics and Acoustic Wave Propagation
- High-pressure geophysics and materials
- Architecture and Computational Design
- Earthquake Detection and Analysis
- Advanced Multi-Objective Optimization Algorithms
- Design Education and Practice
Blastech (United Kingdom)
2013-2024
University of Sheffield
2015-2024
Royal Academy of Engineering
2016
Qinetiq (United Kingdom)
2013
Defence Science and Technology Laboratory
2013
Royal Society
2013
University of Cambridge
2013
Abstract Rapid, accurate assessment of the yield a large-scale urban explosion will assist in implementing emergency response plans, facilitate better estimates areas at risk high damage and casualties, provide policy makers public with more information about event. On 4 August 2020, an occurred Port Beirut, Lebanon. Shortly afterwards, number videos were posted to social media showing moment detonation propagation resulting blast wave. In this article, we present method rapidly calculate...
Following the positive phase of a blast comes period where pressure falls below atmospheric known as negative phase. Whilst is well understood, validation rare in literature, and such it often incorrectly treated or neglected altogether. Herein, existing methods approximating are summarised recommendations which form to use made based on experimental validation. Also, through numerical simulations, impact modelling has been shown its implications discussed.
Computerized layout (or “topology”) optimization was pioneered almost four decades back. However, despite dramatic increases in available computer power and the application of increasingly efficient algorithms, even now only relatively modest sized problems can be tackled using traditional “ground structure” approach. This is because need, general, for latter to contain every conceivable member connecting together nodes a problem. A simple, but effective solution method capable tackling with...
It is self-evident that a crucial step in analysing the performance of protective structures to be able accurately quantify blast load arising from high explosive detonation. For located near source detonation, resulting pressure extremely magnitude and highly non-uniform over face target. There exists very little direct measurement parameters near-field, mainly attributed lack instrumentation sufficiently robust survive extreme loading events yet sensitive enough capture salient features...
The blast overpressure acting on a rigid target is known to vary between the normally reflected and incident as function of angle direction travel wave. Literature guidance for determining exact effects incidence are unclear, particularly when considering negative phase. This paper presents results from series well controlled experiments where pressure transducers used record pressure-time history face large, at various angles varying sizes hemispherical PE4 charge stand-off distances. test...
When a blast wave strikes finite target, diffraction of the around free edge causes rarefaction clearing to propagate along loaded face and relieve pressure acting at any point it passes over. For small targets, time taken for this traverse will be in relation duration loading. Previous studies have not shown what happens late-time stages relief, nor mechanism by which cleared reflected decays approach incident pressure. Current design guidance assumes series interacting waves over target –...
A large scale experimental approach to the direct measurement of spatial and temporal variation in loading resulting from an explosive event has been developed. The utilises a fixed target plate through which Hopkinson pressure bars are inserted. This technique allows pressure-time histories for array be generated, giving data over area interest. numerical interpolation also developed allow full history any point on estimated hence total imparted impulse calculated. principles underlying...
The shock wave generated from a high explosive detonation can cause significant damage to any objects that it encounters, particularly those located close the source of explosion. Understanding blast development and accurately quantifying its effect on structural systems remains considerable challenge scientific community. This paper presents comprehensive experimental study into loading acting on, subsequent deformation of, targets subjected near-field detonations. Two test series were...
Abstract Background: The design and analysis of protective systems requires a detailed understanding of, the ability to accurately predict, distribution pressure loads acting on an obstacle following explosive detonation. In particular, there is pressing need for accurate characterisation blast in region very close detonation, where even small improvised devices can produce serious structural or material damage. Objective: Accurate experimental measurement these near-field events, using...
Truss layout optimization problems with global stability constraints are nonlinear and nonconvex hence very challenging to solve, particularly when become large. In this paper, a relaxation of the problem is modelled as (linear) semidefinite programming for which we describe an efficient primal-dual interior point method capable solving scale that would be prohibitively expensive solve using standard methods. The proposed exploits sparse structure low-rank property stiffness matrices...