Download Advances in military textiles and personal equipment by E Sparks PDF

By E Sparks

ISBN-10: 0857095579

ISBN-13: 9780857095572

ISBN-10: 1845696999

ISBN-13: 9781845696993

Advances in army textiles and private gear summarises key study at the layout, manufacture and purposes of army textiles. half one explores anthropometric equipment, mental, color and camouflage matters on the topic of the profitable layout of army textiles. fabrics and layout concerns in army helmets, shoes and hand put on also are reviewed. half is going directly to reflect on functions of certain types of army garments and kit, together with optimisation of physique armour layout, excessive functionality ballistic security utilizing polymer nanocomposite expertise in addition to advances in fabrics and modelling of chemical, organic, radiological and nuclear protecting garments. eventually, Advances in army textiles and private gear seems in particular at designing load carriage and complex hydration structures for army group of workers.

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Sample text

Both waves propagate along the yarns they have struck (called the primary yarns) and also branch into the crossing yarns (called secondary yarns). The action of the transverse wave in the primary and secondary yarns is to form a pyramid of material, and it is the kinetic energy of the rearwards-moving pyramid (Fig. 4) which is the major dissipation mechanism during the early stage of impact. At later stages the elastic strain energy in the yarns starts to dominate the transfer process, but it should be noted that, as this is elastic strain, the energy is not being dissipated.

Numerous studies of fabric systems have been published, and understanding has slowly developed based on single fibre tests, meso material models and, recently, relatively complete numerical models of multilayer systems (Tabiei and Nilakantan, 2008). Analytical and empirical models have been developed (Cuniff, 1999; Roylance, 1977) which seek to indicate the key fibre and fabric properties required in armour. However, our understanding of the more subtle effects is still somewhat incomplete, with inter-yarn and inter-layer interactions remaining to be fully characterised and with models which are only validated across relatively narrow sets of conditions and materials.

Above some critical velocity the contact load is such that the yarns fail and only a small © Woodhead Publishing Limited, 2012 Key issues in body armour: threats, materials and design 9 amount of energy is extracted from the projectile. But the projectile is progressively decelerated and the ensuing layers accelerated until yarn failure does not occur. Assuming the yarns do not immediately fail, a tensile wave propagates along the yarns away from the impact point, and in this way some energy is absorbed from the projectile.

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