Download or read book Shock Induced Stress Wave Propagation in Sand written by Ernest Theodore Selig and published by . This book was released on 1964 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been made to determine the characteristics of shock induced stress wave propagation in horizontal columns of dry sand confined under constant lateral pressure. The results of experiments in which stress-time histories were measured at several positions along the column were compared to calculated values based upon a nonlinear, inelastic theory of wave propagation. The theoretical results depend primarily upon the assumed stress-stain characteristics for the soil. The stressstrain characteristics considered in the analysis were based upon static stress-strain measurement, taking into account the effects of repeated loading. The modification of the static response by viscous effects and lateral inertia was also considered. The most difficult part of the experimental program was the accurate measurement of stress in the sand column. To accomplish this objective a development effort was undertaken as part of this research to obtain suitable gages and techniques for their use.

Download or read book Blast induced Stress Wave Propagation in Unsaturated Sand written by Nathan A. Dowden and published by . This book was released on 1995 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Wave Propagation in Sand Medium Induced by Blast Load written by Kenichi Noguchi and published by . This book was released on 1968 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Wave Propagation in Sand Medium Induced by Blast Load microfilm written by K. Noguchi and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Blast Induced Stress Wave Propagation and Attenuation written by WA. Charlie and published by . This book was released on 2005 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents results of centrifuge model studies and full-scale field (prototype) studies designed to provide insights into the influence of water content and the degree of saturation during compaction and testing on high-strain rate loading response of medium dense sand. Objectives of the study were to determine the influence of moisture content at the time of compaction on blast-induced ground shock and stress wave propagation and to compare centrifuge model explosive tests with prototype explosive tests. Model testing was conducted using a geotechnical centrifuge to simulate prototype testing conducted at a field explosives test site. Centrifuge models were constructed at scales of 1/26.3 and 1/18.9 and tested at acceleration levels of 26.3 and 18.9 times earth's gravity. Explosives consisting of 3.50 × 10-4 kg (350 mg) and 1.031 × 10-3 kg (1031 mg) of PBX 9407 were buried at depths of 76 mm and 54 mm, respectively. These scaled model tests simulated prototype tests in which 7-kg TNT equivalent explosive charges were detonated at a depth of 1.4 m. Specimens were compacted to a dry density of 1635 kg/m3 at degrees of saturation ranging from 0 to 60 % (water contents from 0 to 14.4 %). Centrifuge model tests and the prototype tests showed similar results. Peak particle velocity, peak stress, and peak scaled acceleration were found to be a function of the degree of saturation with the lowest values at 0 % saturation. Lowest attenuation coefficients occurred in the sand compacted at degrees of saturation of 13 % for the centrifuge tests and 20 % for the prototype tests. Highest attenuation coefficients occurred in the sand compacted dry and at 60 % saturation for all the prototype tests and most of the centrifuge tests. Attenuation coefficients generally decreased with increasing seismic velocities.

Download or read book Measurements of Stress strain Peak Particle Velocity and Wave propagation in Three Sands written by W. L. Durbin and published by . This book was released on 1965 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Dynamic Stress strain and Wave propagation Characteristics of Soils written by W. L. Durbin and published by . This book was released on 1964 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Dynamic Stress strain Relation for a Sand as Deduced by Studying Its Shock wave Propagation Characteristics in a Laboratory Device written by Thomas Edward Kennedy and published by . This book was released on 1966 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Wave Propagation in Unsaturated Sands Volume 1 Centrifuge Modeling written by Andy J. Walsh and published by . This book was released on 1993 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explosive model testing was conducted using a geotechnical centrifuge in order to simulate prototype stresses and ground motions in a representative cohesionless backfill. Models were constructed of sand and compacted moist to a constant void ratio using a vibratory technique. Exploding detonators were used to simulate contained bombs in the backfill material. The objective of this study was to determine the influence of moisture content, at the time of backfill compact ion, on blast induced stress wave propagation. Models were constructed to 1/18.9 and 1/26.3 scales. Explosives consisted of 1031 mg and 350 mg of PBX 9407 and were buried to depths of 7.6 cm and 5.4 cm respectively. These scaled models simulated prototype charges of 6.9 kg and 6.4 kg (7.8 kg and 7.3 kg TNT equivalent) at a depth of burial of 1.4 meters. Attenuation coefficients (n) show some influence with respect to saturation. Peak stress and peak particle acceleration intercepts at a scaled distance of one are lowest at 0 and 53 percent saturations and are maximum at 35 percent saturation. Peak particle velocity intercepts are lowest at 0 and 70 percent saturations and again are maximum at 35 percent saturation.

Download or read book Granular Materials Under Shock and Blast Loading written by Padmanabha Vivek and published by Springer Nature. This book was released on 2019-10-31 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses the fundamental dynamic behaviour of granular materials, in particular cohesionless sand, when subjected to shock and blast wave loading. The contents of the book are mainly divided into three parts based on the type of loading imparted to the granular materials: Shock-wave loading (step pulse); Air-blast loading (Friedlander wave); Buried-blast loading. It provides a comprehensive review of the available testing methods, along with the necessary diagnostic measurements for material characterization, making it useful for researchers working in the area of blast protection and Impact engineering.

Download or read book Study of the Dynamic Stress strain and Wave propagation Characteristics of Soils written by and published by . This book was released on 1964 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Axisymmetric Stress Wave Propagation in Sand written by Richard Allen Wetzel and published by . This book was released on 1969 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Wave Propagation in Unsaturated Sands Volume 2 Field Explosive Tests written by Edward J. Villano and published by . This book was released on 1993 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explosive field tests were conducted in unsaturated Poudre Valley sand for the determination of peak ground shock parameters, propagation velocity and attenuation trends as a function of compactive saturation. The sand was compacted moist to a dry density of 1635 kg/cu.m at compactive saturation levels ranging from 0 to 70 percent. Three explosive masses of 6.22 kg, 7.0 kg and 0. 227 kg TNT equivalency were used at a depth of burial of 1.4 meters to provide scaled range (R/W(exp 1/3)) values ranging from 0.32 m/kg(exp 1/3) to 3.8 m/ kg(exp 1/3). Scaled peak particle acceleration, peak particle velocity, peak stress and propagation velocities are presented as a function of scaled range. Constants (Y-intercept at R/W(exp 1/3) = 1) taken from the developed empirical predictive equations for peak ground shock parameters are generally lower but follow the same trends as those of Tyndall Beach and Ottawa 20-30 sands obtained from centrifuge tests. Slope ( -n or n-1) values taken from the same predictive velocity intercepts are lowest at 0 and 13 percent compactive saturations.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1972 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foundations of Stress Waves written by Lili Wang and published by Elsevier. This book was released on 2011-08-26 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of Foundations of Stress Waves is to give the reader an understanding of stress wave behaviour while taking into account the dynamic constitutive equations of elastic-plastic solids. The author has combined a 'materials characteristics' approach with a 'singularity surface' approach in this work, which readers will find to be a novel and unique route to solving their problems. Helps engineers understand the effects and behavior of stress waves in various materials Aids in the process of engineering design, testing, and evaluation

Download or read book Fundamentals of Shock Wave Propagation in Solids written by Lee Davison and published by Springer Science & Business Media. This book was released on 2008-04-24 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: My intent in writing this book is to present an introduction to the thermo- chanical theory required to conduct research and pursue applications of shock physics in solid materials. Emphasis is on the range of moderate compression that can be produced by high-velocity impact or detonation of chemical exp- sives and in which elastoplastic responses are observed and simple equations of state are applicable. In the interest of simplicity, the presentation is restricted to plane waves producing uniaxial deformation. Although applications often - volve complex multidimensional deformation fields it is necessary to begin with the simpler case. This is also the most important case because it is the usual setting of experimental research. The presentation is also restricted to theories of material response that are simple enough to permit illustrative problems to be solved with minimal recourse to numerical analysis. The discussions are set in the context of established continuum-mechanical principles. I have endeavored to define the quantities encountered with some care and to provide equations in several convenient forms and in a way that lends itself to easy reference. Thermodynamic analysis plays an important role in continuum mechanics, and I have included a presentation of aspects of this subject that are particularly relevant to shock physics. The notation adopted is that conventional in expositions of modern continuum mechanics, insofar as possible, and variables are explained as they are encountered. Those experienced in shock physics may find some of the notation unconventional.