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Author: Praveen Kumar Baba Siddabattuni Publisher: ISBN: Category : Languages : en Pages : 46
Book Description
In the recent wars of Iraq and Afghanistan, many soldiers sustained bTBI (blast-induced traumatic brain injury). The blasts are created by extensive use of improvised explosive devices (IED’s). Whether pure blast-shock waves cause TBI or what is the mechanism of injury are not fully known. Research efforts are underway to find answers to these questions. The primary objective of this project is to understand how the shockwave interacts with a fluid-filled cylinder of different thicknesses. Here, the cylinder is idealized as head and the fluid filled inside it as the brain material. The primary interest here is, how the pure shockwave behaves when a cylinder is exposed to different incident blast over-pressures. The question raised in this work is whether primary blast wave causes for TBI? The pressure response inside the cylinder and the deformations for different thicknesses exposing at different blast loadings are taken into account in answering this question. Polycarbonate is chosen to simulate human skull. De-ionized water is used as the fluid as its mechanical property is close to that of brain. As the human head varies in thickness from 4mm in the temporal region to 8mm in the occipital region of the skull, two different thickness polycarbonate cylinders have been used to mimic that variation. All the experiments are done in the blast tube where the shockwaves are produced in the test section. Pure shock wave due to explosives in free field conditions will have a Friedlander wave form which will be artificially generated in 9 inch shock tube. High speed cameras are used for capturing motion of the cylinder during shock loading. Two different pressures 20 psi (140 kPa) and 30 psi (210 kPa) are used as the peak blast overpressures with two different thickness 1.9 and 3.3mm and diameter of the cylinder is 50mm. Pressure in the fluid is measured at three different locations whereas strain gages measure deformations at three sites. Analysis of data indicate that the pressure in the fluid is affected by not only the external pressure but also thickness of the cylinder. Thus, the pressure is affected by both direct transmission as well as cylinder deformation.
Author: Praveen Kumar Baba Siddabattuni Publisher: ISBN: Category : Languages : en Pages : 46
Book Description
In the recent wars of Iraq and Afghanistan, many soldiers sustained bTBI (blast-induced traumatic brain injury). The blasts are created by extensive use of improvised explosive devices (IED’s). Whether pure blast-shock waves cause TBI or what is the mechanism of injury are not fully known. Research efforts are underway to find answers to these questions. The primary objective of this project is to understand how the shockwave interacts with a fluid-filled cylinder of different thicknesses. Here, the cylinder is idealized as head and the fluid filled inside it as the brain material. The primary interest here is, how the pure shockwave behaves when a cylinder is exposed to different incident blast over-pressures. The question raised in this work is whether primary blast wave causes for TBI? The pressure response inside the cylinder and the deformations for different thicknesses exposing at different blast loadings are taken into account in answering this question. Polycarbonate is chosen to simulate human skull. De-ionized water is used as the fluid as its mechanical property is close to that of brain. As the human head varies in thickness from 4mm in the temporal region to 8mm in the occipital region of the skull, two different thickness polycarbonate cylinders have been used to mimic that variation. All the experiments are done in the blast tube where the shockwaves are produced in the test section. Pure shock wave due to explosives in free field conditions will have a Friedlander wave form which will be artificially generated in 9 inch shock tube. High speed cameras are used for capturing motion of the cylinder during shock loading. Two different pressures 20 psi (140 kPa) and 30 psi (210 kPa) are used as the peak blast overpressures with two different thickness 1.9 and 3.3mm and diameter of the cylinder is 50mm. Pressure in the fluid is measured at three different locations whereas strain gages measure deformations at three sites. Analysis of data indicate that the pressure in the fluid is affected by not only the external pressure but also thickness of the cylinder. Thus, the pressure is affected by both direct transmission as well as cylinder deformation.
Author: Z. Han Publisher: Springer Science & Business Media ISBN: 9401729956 Category : Technology & Engineering Languages : en Pages : 331
Book Description
This book was written as a graduate student course--Shock Dynamics. Up to now, the first author has taught this course to the graduate students in the field of Fluid Mechanics, Department of Modern Mechanics, University of Science and Technology of China for seven times. In the spring semester 1989, during his visit to the United States, the first author taught this course to the graduate students of Department of Mathemat ics, University of Colorado at Denver. At the same time, he gave a series of four lectures on Shock Dynamics to the graduate students of Department of Aerospace Engineering Sciences, University of Colorado at Boulder. In 1991, during the first author's visit to Japan, he gave some lectures on Shock Dynamics in Tohoku University, University of Tokyo and Kyushu Uni versity. The dynamic phenomena of shock waves such as propagation, diffraction, reflection, refraction and interaction of shock waves may be studied by using experimental methods, numerical calculations and theoretical analyses. Although the detailed flow patterns of phenomena of shock motion can be obtained by using experimental methods and numerical calculations of solving Euler Equation or Navier-Stokes Equation, for example, the diffractions of shock waves by wedges form various phenomena of reflection--RR, SMR, CMR and DMR, we also need to analyse the process of the formation of shock waves in various phenomena of diffraction, reflection and interaction by using theoretical methods.
Author: Ozer Igra Publisher: Springer ISBN: 3319237454 Category : Technology & Engineering Languages : en Pages : 480
Book Description
This comprehensive and carefully edited volume presents a variety of experimental methods used in Shock Waves research. In 14 self contained chapters this 9th volume of the “Shock Wave Science and Technology Reference Library” presents the experimental methods used in Shock Tubes, Shock Tunnels and Expansion Tubes facilities. Also described is their set-up and operation. The uses of an arc heated wind tunnel and a gun tunnel are also contained in this volume. Whenever possible, in addition to the technical description some typical scientific results obtained using such facilities are described. Additionally, this authoritative book includes techniques for measuring physical properties of blast waves and laser generated shock waves. Information about active shock wave laboratories at different locations around the world that are not described in the chapters herein is given in the Appendix, making this book useful for every researcher involved in shock/blast wave phenomena.
Author: R. S. Srivastava Publisher: Springer Science & Business Media ISBN: 9401110867 Category : Technology & Engineering Languages : en Pages : 329
Book Description
One of the great twentieth-century achievements in the mechanics of fluids was the full elucidation of the physics of shock waves and the later comprehensive development of understanding of how shock waves propagate (i) through otherwise undisturbed fluid and (ii) in interaction either with solid bodies or with independently generated fluid flows. The interaction problems (ii) were soon found to raise some very special difficulties (beginning with the common formation of "Mach stems" in shock-wave reflection) yet they also turned out to possess enormous scientific interest as well as being highly important in practical applications. For all these reasons the appearance of this book on "Interaction of Shock Waves" by one of the world's major contributors to knowledge in that field is most particularly to be welcomed. It covers all those approaches to the subject which have been found fruitful, and most satisfactorily goes into comprehensive detail about each. At last the important achievements of the leading research workers, experimental as well as theoretical, on shockwave interaction problems are brought together in a single convenient and well written volume. I warmly congratulate the author and the publisher on having performed, for the benefit of everyone interested in the mechanics of fluids, this immensely valuable service.
Author: Holger Babinsky Publisher: Cambridge University Press ISBN: 1139498649 Category : Technology & Engineering Languages : en Pages : 481
Book Description
Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
Author: Piotr Doerffer Publisher: Springer Science & Business Media ISBN: 3642030041 Category : Technology & Engineering Languages : en Pages : 350
Book Description
This volume contains description of experimental and numerical results obtained in the UFAST project. The goal of the project was to generate experiment data bank providing unsteady characteristics of the shock boundary layer interaction. The experiments concerned basic-reference cases and the cases with application of flow control devices. Obtained new data bank have been used for the comparison with available simulation techniques, starting from RANS, through URANS, LES and hybrid RANS-LES methods. New understanding of flow physics as well as ability of different numerical methods in the prediction of such unsteady flow phenomena will be discussed.
Author: Seán Prunty Publisher: Springer Nature ISBN: 3030636062 Category : Science Languages : en Pages : 356
Book Description
This book provides an elementary introduction to one-dimensional fluid flow problems involving shock waves in air. The differential equations of fluid flow are approximated by finite difference equations and these in turn are numerically integrated in a stepwise manner, with artificial viscosity introduced into the numerical calculations in order to deal with shocks. This treatment of the subject is focused on the finite-difference approach to solve the coupled differential equations of fluid flow and presents the results arising from the numerical solution using Mathcad programming. Both plane and spherical shock waves are discussed with particular emphasis on very strong explosive shocks in air. This expanded second edition features substantial new material on sound wave parameters, Riemann's method for numerical integration of the equations of motion, approximate analytical expressions for weak shock waves, short duration piston motion, numerical results for shock wave interactions, and new appendices on the piston withdrawal problem and numerical results for a closed shock tube. This text will appeal to students, researchers, and professionals in shock wave research and related fields. Students in particular will appreciate the benefits of numerical methods in fluid mechanics and the level of presentation.
Author: Konstantinos Kontis Publisher: Springer ISBN: 3319731807 Category : Technology & Engineering Languages : en Pages : 408
Book Description
This edited monograph contains the proceedings of the International Shock Interaction Symposium, which emerged as an heir to both the Mach Reflection and Shock Vortex Interaction Symposia. These scientific biannual meetings provide an ideal platform to expose new developments and discuss recent challenges in the field of shock wave interaction phenomena. The goal of the symposia is to offer a forum for international interaction between young and established scientists in the field of shock and blast wave interaction phenomena. The target audience of this book comprises primarily researchers and experts in the field of shock waves, but the book may also be beneficial for young scientists and graduate students alike.
Author: Gabi Ben-Dor Publisher: Elsevier ISBN: 0080533728 Category : Science Languages : en Pages : 2188
Book Description
The Handbook of Shock Waves contains a comprehensive, structured coverage of research topics related to shock wave phenomena including shock waves in gases, liquids, solids, and space. Shock waves represent an extremely important physical phenomena which appears to be of special practical importance in three major fields: compressible flow (aerodynamics), materials science, and astrophysics. Shock waves comprise a phenomenon that occurs when pressure builds to force a reaction, i.e. sonic boom that occurs when a jet breaks the speed of sound.This Handbook contains experimental, theoretical, and numerical results which never before appeared under one cover; the first handbook of its kind.The Handbook of Shock Waves is intended for researchers and engineers active in shock wave related fields. Additionally, R&D establishments, applied science & research laboratories and scientific and engineering libraries both in universities and government institutions. As well as, undergraduate and graduate students in fluid mechanics, gas dynamics, and physics. Key Features* Ben-Dor is known as one of the founders of the field of shock waves* Covers a broad spectrum of shock wave research topics* Provides a comprehensive description of various shock wave related subjects* First handbook ever to include under one separate cover: experimental, theoretical, and numerical results
Author: Praveen Kumar Baba Siddabattuni
Author: Praveen Kumar Baba Siddabattuni
Author: Praveen Kumar Baba Siddabattuni
Author: Z. Han
Author: Ozer Igra
Author: R. S. Srivastava
Author: Holger Babinsky
Author: Piotr Doerffer
Author: Seán Prunty
Author: Konstantinos Kontis
Author: Gabi Ben-Dor