Projectile Impact

High energy impact phenomena have been investigated by engineers of various backgrounds and disciplines. Structures often need to be designed against impact or potential attack and on the other hand the removal of decommissioned structures may be achieved by shaped charge impact, alternatively known as explosive cutting. The topic of ballistic impact is wide-ranging and encompasses various levels of kinetic energy input as well as a multitude of projectile-target materials and geometries. It has thus become the object of many experimental and analytical investigations resulting in numerous sparsely-spread articles in periodicals and conference proceedings as well as monographs narrowly focusing on specific types and ranges of impact scenarios. This volume describes a broad spectrum of analytical and experimental work in this area, thus providing considerable insight into the complexity and diversity of impact phenomena. By addressing a significant number of important issues it combines, rather uniquely, subject breadth and density with in-depth study of impact events of great engineering interest.

In this book, the authors present their theoretical, experimental and numerical investigations into concrete structures subjected to projectile and aircraft impacts in recent years. Innovative approaches to analyze the rigid, mass abrasive and eroding projectile penetration and perforation are proposed. Damage and failure analyses of nuclear power plant containments impacted by large commercial aircrafts are numerically and experimentally analyzed. Ultra-high performance concrete materials and structures against the projectile impact are developed and their capacities of resisting projectile impact are evaluated. This book is written for the researchers, engineers and graduate students in the fields of protective structures and terminal ballistics.

This book presents comprehensive experimental, numerical, and theoretical research on projectile impact analysis, such as the rigid projectile penetration/perforation of concrete and metallic targets, and shaped-charge-formed projectile and jet penetrations. Concrete and metal materials are widely used in protective structures in both civil engineering and armored vehicles, such as military fortifications, underground shelters, infantry fighting vehicles, and tanks, which are designed to withstand intentional or accidental impact loadings caused by projectiles and fragments, and the responses of these targets under projectile impact have been a topic of discussion for several decades. Written for researchers and engineers working in the fields of protective structures and high-speed penetration mechanics, the book is also a valuable reference for senior undergraduate and postgraduate students majoring in defense engineering, terminal ballistics and other related fields.

This book is intended to help the reader understand impact phenomena as a focused application of diverse topics such as rigid body dynamics, structural dynamics, contact and continuum mechanics, shock and vibration, wave propagation and material modelling. It emphasizes the need for a proper assessment of sophisticated experimental/computational tools promoted widely in contemporary design. A unique feature of the book is its presentation of several examples and exercises to aid further understanding of the physics and mathematics of impact process from first principles, in a way that is simple to follow.

Impact Wear of Materials is entirely devoted to quantitative treatment of various forms of wear occurring in impact-loaded mechanical components. Impact wear is classified under two headings, namely `erosive' and `percussive' wear. In erosive wear, particle streams and liquid jets are discussed. The subject is developed with emphasis on material relations, stress analysis and the historical progress of research. In percussive wear, a wide variety of wear mechanisms is described.The author's experimental/analytical work created the groundwork for a general procedure of impact wear-law formulation, combining impact analysis with the physical wear mechanism. Ballistic impact and pivotal hammering, compound impact, the optimal wearpath, lubrication, plasticity, and flexible media are some of the topics considered.The book develops a new conceptual approach to impact, impact-originated wear and wear in general. It describes and utilizes the modern tools of observation in wear science. In mechanical analysis it emphasizes quantitative treatment, using such tools as finite element stress analysis, APL programming language etc., each applied with classic simplicity. Numerous photographs, tables, figures and examples are used throughout the text and the mathematical treatment strives for simplicity and conceptual clarity. The book is of value to mechanical component designers, analysts and researchers. It is also useful in science and engineering curricula at senior and graduate level and, although its appeal is primarily in tribology, machine design and materials science, its interdisciplinary language makes it accessible to any branch of the physical sciences and engineering.