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Wiesław Barnat and Dariusz Sokołowski

References 1. Barauskas R. (2007), Multi-Scale Modelling of Textile Structures in Terminal Ballistics, 6th European LS-DYNA Users’ Conference, 4.141-4.154. 2. Ha-Minh C., Imad A., Kanit T., Boussu F. (2013), Numerical analysis of a ballistic impact on textile fabric, International Journal of Mechanical Sciences, 32-39. 3. Horsfall I. (2000), Stab Resistant Body Armour, Cranfield University, Engineering Systems Department Submitted For The Award Of PhD. 4. Johnson A., Bingham A., G., Majewski E. C

Open access

Anne-Caroline Le Coultre

Abstract

Le Jeu de la Hache displays a fighting-system with the pollaxe in armour, but the weapon is never described with precision, which leads to debates regarding its typology – cutting edge or hammer/raven’s beak? Through a semi-quantitative survey, we tried to offer an overview of current HEMA practice around this specific source, with special emphasis on the typological question. Despite the rather narrow scope of the inquiry, some trends emerge. Besides the various choices regarding terminology and sources, we can underline the variety of materials used for the simulators: rubber components («hammer» typology) are leading, but wood and metal are also used, for both typologies. Advantages and disadvantages of each rely on the articulation of safety and realism dimensions, and the dangerousness inherent to this kind of weapon is largely highlighted. Even if most respondents declare not to be familiar with the typological debates amongst historians, it was usually mentioned to them during their practice. Only a minority has taken part in experiments in order to bring some elements of answer, but seldom in a systematic way. Therefore, a praxeological experimental approach could bring up new data, but is not devoid of difficulties, for instance the necessity of wearing armour.

Open access

Piotr Gospodarczyk

Abstract

This paper presents a methodology for modeling work of a coal shearer work in low longwall coal seams where the wall height does not exceed 1.5 m. In such conditions, an important issue is the process of loading the ore from shearer cutting drum on an armored face conveyor and selection of appropriate kinematic parameters to avoid choking. Discrete element method was used to model coal seam. This method allows for efficient simulation of physical systems composed of many separate components. Methods and algorithms based on existing theoretical models were developed to imitate coal cutting process. Main focus of analysis was put on coal stream movement for different variants of the shearer construction and kinematic parameters.

Open access

W. Barnat

Abstract

This paper presents experimental and numerical studies on influence of an incidence angle of the shock wave on a steel plate. The problem of interaction between the wave front and a barrier is important from the point of view of protection the crew of armored vehicles. One way of remedying the harmful effects of impacts of the shock wave is the reflection wave of the barrier set at an angle to the face of the wave. The article presents the numerical and experimental approach to the subject. The numerical part presents four models in which the plate was set at angles 0◦, 15◦, 30◦, 45◦. In each case, the plate was loaded by a wave formed after the explosion 2 kg of TNT. In the experimental part the results are presented from an experiment in which the wave was formed from 2 kg TNT detonation at a distance of 0.4 m in parallel to the steel plate.

Open access

Jiří Matějíček, Barbara Nevrlá, Monika Vilémová and Hanna Boldyryeva

Abstract

Tungsten is a prime candidate material for the plasma-facing components in future fusion devices, e.g. ITER and DEMO. Because of the harsh and complex loading conditions and the differences in material properties, joining of the tungsten armor to the underlying construction and/or cooling parts is a complicated issue. To alleviate the thermal stresses at the joint, a sharp interface may be replaced by a gradual one with a smoothly varying composition. In this paper, several techniques for the formation of tungsten-steel composites and graded layers are reviewed. These include plasma spraying, laser cladding, hot pressing and spark plasma sintering. Structure, composition and selected thermal and mechanical properties of representative layers produced by each of these techniques are presented. A summary of advantages and disadvantages of the techniques and an assessment of their suitability for the production of plasma-facing components is provided.

Open access

Jan H. Orkisz

). Oakeshott, Ewart, European Weapons and Armour: From the Renaissance to the Industrial Revolution (Oxford: Boydell Press, 2012). Petersen, Jan G.T. De Norske Vikingesverd, (Kristiania: Dybwad i Komm., 1919). Short, William R., Viking Age Arms and Armor: Viking Shields, <http://www.hurstwic.com/history/articles/manufacturing/text/viking_shields.htm>, accessed 3 March 2016. Short, William R., Viking Age Arms and Armor: Viking Spear, <http://www.hurstwic.com/history/articles/manufacturing/text/viking_spear.htm >, accessed 3

Open access

Gheorghe Bogdan Pulpea

Abstract

During the last decades, the military combat vehicles and trucks were equipped with various weapon systems and laser rangefinders, optical devices and sighting equipment. The military vehicles were thus upgraded, so they become a more attractive target for enemy fire. Since ballistic armour cannot and will never completely protect vehicles against kinetic or explosive ammunitions, various pyrotechnic countermeasure systems such as smoke screening, were designed and implemented. Generating smoke screens or flares in the desired area (around the combat armoured vehicles) is a concern of many manufacturers of pyrotechnic protection systems, aiming to protect against detection in the visual (VIS) and infrared (IR) spectrum. The goal of this article is to present a brief state-of-the-art regarding the development of pyrotechnic smoke camouflage systems and flares used to ensure countermeasures in the visible and infrared electromagnetic spectrum. Types of pyrotechnic systems and structures for the protection of military vehicles will be described briefly.

Open access

Raquel Castaño, Mita Sujan, Manish Kacker and Harish Sujan

References Hoeffler, Steve (2003): “Measuring Preferences for Really New Products”, Journal of Marketing Research, 40 (4), pp. 406 - 421. Taylor, Shelley E., Lien B. Pham, Inna D. Rivkin, and David A. Armor (1998): “Harnessing the Imagination, Mental simulation, Self-regulation, and Coping”, American Psychologist, 53 (4), pp. 429 - 439. Thompson, Debora V., Rebecca W. Hamilton, and Roland T. Rust (2005): “Feature Fatigue: When Product Capabilities Become Too Much of a Good Thing”, Journal of Marketing Research

Open access

Alin-Marian Puncioiu, Ioan Vedinaş and Valentin Vînturiş

References [1] Frăţilă, Gh., Mărculescu, Gh., The braking systems of motor vehicles , Bucharest, Technical Publishing House, 1986. [2] Limpert, R., Brake design and safety, third ed. , SAE International, Warrendale, 2011. [3] Marinescu, M., Modern Solutions in Vehicle Manufacturing. , Bucharest, Military Technical Academy Publishing House, 2002. [4] Marinescu, M., Theory, calculation and construction of armored personnel carrier. Bucharest, Military Technical Academy Publishing House, 2006. [5] Puncioiu, A., Truţă, M

Open access

Paweł Bogusz, Roman Gieleta, Marcin Konarzewski and Michał Stankiewicz

of PVC foam under cyclic loading, J Mat Sci , 48(19), 6786-6796. 7. Cook W. ( 2008), Designing body armour for today’s police, Technical Textiles , 3/4, 50-53. 8. Department of Defence Test Method Standard, MIL-STD-622F (1997), V50 ballistic test for armor , Department of Defence, U.S. 9. Gdoutos E.E., Daniel I.M., Wang K-A. (2001), Multiaxial characterization and modeling of a PVC cellular foam, J Thermoplast Compos Mater , 14(5), 365–373. 10. Hoo Fatt M.S., Chen L. (2015), A viscoelastic damage model for hysteresis in PVC H100