8 Matching Results

Search Results

Advanced search parameters have been applied.

An Experimental Method to Determine Equation of State Data for Solids by Shock Wave Measurements

Description: The following report describes and experimental method used to determine equation of state of materials under strong shock. The method was devised of simultaneously measuring the velocity of the shock through a plate, and the velocity of the free surface after the shock has traversed the plate. Further analysis is presented.
Date: 1953
Creator: Christian, Russell H. & Walsh, John M.
Partner: UNT Libraries Government Documents Department

Response of Pressure Gauges to Dust-Laden Shock Waves

Description: "A series of shock tube studies demonstrate that two types of pressure gauges respond to dust carried with shock waves by indicating an increase in dynamic pressure. This contribution to the dynamic pressure is approximately the product of the dust density and the square of the dust velocity under the experimental conditions. Besides this information studies give insight into the interaction of a square shock wave with dust when that dust is placed in a plane before and parallel to the shock front. It is found that the shape of the pressure wave is little changed except for a rounding of the front. The dust, after accelerating, is carried as a pulse with the mass flow velocity of the air."
Date: 1954-05-21?
Creator: Banister, John Robert & Broyles, C. D.
Partner: UNT Libraries Government Documents Department

Seismic Waves from an Underground Explosion in a Salt Bed: Preliminary Report

Description: From abstract: Seismic waves resulting from a 5 kiloton nuclear detonation 1200 feet deep in a salt bed near Carlsbad, New Mexico were measured by strong-motion seismographs operated by the Coast and Geodetic Survey on the surface in the distance range from 0.5 to 8.8 miles and underground in a potash mine 8.7 to 11.2 miles distant.
Date: April 12, 1962
Creator: Carder, Dean S.; Mickey, W. V.; Murphy, L. M.; Cloud, W. K.; Jordan, J. N. & Gordon, D. W.
Partner: UNT Libraries Government Documents Department

High energy-density water: density functional theory calculations of structure and electrical conductivity.

Description: Knowledge of the properties of water is essential for correctly describing the physics of shock waves in water as well as the behavior of giant planets. By using finite temperature density functional theory (DFT), we have investigated the structure and electronic conductivity of water across three phase transitions (molecular liquid/ ionic liquid/super-ionic/electronic liquid). There is a rapid transition to ionic conduction at 2000 K and 2 g/cm{sup 3} while electronic conduction dominates at temperatures above 6000 K. We predict that the fluid bordering the super-ionic phase is conducting above 4000 K and 100 GPa. Earlier work instead has the super-ionic phase bordering an insulating fluid, with a transition to metallic fluid not until 7000 K and 250 GPa. The tools and expertise developed during the project can be applied to other molecular systems, for example, methane, ammonia, and CH foam. We are now well positioned to treat also complex molecular systems in the HEDP regime of phase-space.
Date: March 1, 2006
Creator: Desjarlais, Michael Paul & Mattsson, Thomas Kjell Rene
Partner: UNT Libraries Government Documents Department

Shock analysis using the multi point velocimeter (VISAR).

Description: The velocity of short duration high-amplitude shock waves and high-speed motion created by sources such as explosives, high energy plasmas and other rapid-acceleration devices are difficult to measure due to their fast reaction times. One measurement tool frequently used is VISAR (Velocity Interferometer System for Any Reflector). VISAR is an optical-based system that utilizes Doppler interferometry techniques to measure the complete time-history of the motion of a surface. This technique is gaining worldwide acceptance as the tool of choice for measurement of shock phenomena. However, one limitation of the single point VISAR is that it measures only one point on a surface. The new Multi Point VISAR remedies the single point VISAR's limitation by using multiple fiber optics and sensors to send and receive information. Upcoming programs that need analysis of large diameter flyers prompted the concept and design of a single cavity-multiple fiber optic Multi Point VISAR (MPV). Preliminary designs and the testing of a single cavity prototype in 1996 supported the theory of compact fiber optic bundle systems for development into the Multi Point VISAR. The new MPV was used to evaluate the performance of two components; a piezo-driven plane wave generating isolator, and a slim-loop ferroelectric (SFE)-type fireset.
Date: October 1, 2003
Creator: Fleming, Kevin James & Broyles, Theresa A.
Partner: UNT Libraries Government Documents Department

The Sandia MEMS passive shock sensor : FY08 design summary.

Description: This report summarizes design and modeling activities for the MEMS passive shock sensor. It provides a description of past design revisions, including the purposes and major differences between design revisions but with a focus on Revisions 4 through 7 and the work performed in fiscal year 2008 (FY08). This report is a reference for comparing different designs; it summarizes design parameters and analysis results, and identifies test structures. It also highlights some of the changes and or additions to models previously documented [Mitchell et al. 2006, Mitchell et al. 2008] such as the way uncertainty thresholds are analyzed and reported. It also includes dynamic simulation results used to investigate how positioning of hard stops may reduce vibration sensitivity.
Date: November 1, 2008
Creator: Walraven, Jeremy Allen; Baker, Michael Sean; Clemens, Rebecca C.; Mitchell, John Anthony; Brake, Matthew Robert; Epp, David S. et al.
Partner: UNT Libraries Government Documents Department