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Cambridge, United Kingdom

Walley S.M.,SMF Fracture and Shock Physics Group
Advances in Applied Ceramics | Year: 2010

A brief outline is given of how ceramics came to be considered as armour materials. The major developments in understanding what mechanical properties are relevant to their use in this application are summarised along with experimental techniques for measuring them. © 2010 Institute of Materials, Minerals and Mining Published by Maney on behalf of the Institute. Source

Walley S.M.,SMF Fracture and Shock Physics Group
Strain | Year: 2014

The purpose of this review is to introduce the interested reader to the literature on the use of silica glasses in ballistic applications. These applications include optically transparent windows (where their amorphous nature, appropriate band gap, and cheapness make them ideal window materials) as well as layers in opaque armours designed to be resistant to shaped charges. In the latter application, their increase in volume (bulking) on fracture disrupts the shaped charge jet. Other topics covered in this review include low-velocity damage by windborne debris, liquid and solid impact, dynamic methods of testing (Hopkinson pressure bar, Taylor impact, and plate impact shock loading), and constitutive models. The use of glass as a shaped charge is also discussed. © 2013 Wiley Publishing Ltd. Source

Dodd B.,Imperial College London | Walley S.M.,SMF Fracture and Shock Physics Group | Yang R.,CAS Institute of Mechanics | Nesterenko V.F.,University of California at San Diego
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2015

The standard story of the discovery of adiabatic shear bands is that it began with the American researchers Zener and Hollomon’s famous 1944 paper where the phenomenon was first reported and named. However, a recent discovery by one of us (SMW) in the Cambridge University Library has shown that the phenomenon was discovered and described by a Russian researcher, V.P. Kravz-Tarnavskii, in 1928. A follow-up paper was published by two of his colleagues in 1935. Translations of the 1928 and 1935 papers may be found at http://arxiv.org/abs/1410.1353. © 2015, The Minerals, Metals & Materials Society and ASM International. Source

Walley S.M.,SMF Fracture and Shock Physics Group | Field J.E.,SMF Fracture and Shock Physics Group | Proud W.G.,Imperial College London | Williamson D.M.,SMF Fracture and Shock Physics Group | Jardine A.P.,SMF Fracture and Shock Physics Group
Propellants, Explosives, Pyrotechnics | Year: 2015

Conventional impact sensitiveness machines (e.g. Rotter and BAM) do not provide detailed information about hot-spot ignition mechanisms in energetic materials. To gain further insight, a glass anvil technique was developed at Cambridge in the early 1950s, which allowed high-speed photographic studies to be performed during impact on energetic liquids, explosive powders and crystals. Herein we review such investigations which continue up to the present day. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Braithwaite C.H.,SMF Fracture and Shock Physics Group | Aydelotte B.,Georgia Institute of Technology | Jardine A.P.,SMF Fracture and Shock Physics Group
Journal of Physics: Conference Series | Year: 2014

A series of experiments were performed to probe the tensile behaviour of a cold sprayed reactive metal composite material containing a mixture of nickel and aluminium. Data were acquired at two different strain rates and were collected using high speed photography, strain gauges, force-extension measurements and were analysed using digital image correlation techniques. Comparisons were made with modelling on representative microstructural elements in the CTH code, supporting the conclusion that the material failed in shear rather than tension, in a manner dictated by the microstructure. Fairly high sample to sample variation was observed as well as minimal evidence of strain rate dependent behaviour. © Published under licence by IOP Publishing Ltd. Source

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