Bulletin of the American Physical Society
15th APS Topical Conference on Shock Compression of Condensed Matter
Volume 52, Number 8
Sunday–Friday, June 24–29, 2007; Kohala Coast, Hawaii
Session B2: Inelastic Deformation-Glass and Porous Media |
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Chair: Naresh Thadhani, Georgia Institute of Technology Room: Fairmont Orchid Hotel Amphitheater |
Monday, June 25, 2007 10:30AM - 10:45AM |
B2.00001: Dynamic Compaction of Sand Justin Brown, Tracy Vogler, Lalit Chhabildas Dynamic compaction of sand was investigated experimentally to stress states of approximately 2 GPa using a special target fixture for accurately measuring shock velocity in porous materials. Experiments were performed in the partial to nearly full compaction region. The Hugoniot state of the sand was determined using the measured velocity interferometer profiles and impedance matching techniques. The velocity interferometer probes located on the rear surface of a stepped target provide accurate measurements of shock velocity by correlating time difference for the four measurements. These results were used to fit parameters for the P-Alpha and P-Lambda models for porous materials for simulating the experiments with the CTH hydrocode. [Preview Abstract] |
Monday, June 25, 2007 10:45AM - 11:00AM |
B2.00002: Shock-Loading of Statically Compacted Sand David Chapman, Christopher Braithwaite, William Proud Herrmann's P-alpha model has recently been applied the behaviour of porous geological systems. The equation of state is broken into two distinct regions; un-compacted and a fully compacted. In an effort to improve understanding of the compaction process plate-impact experiments have been conducted on compacted sand. Sand is quasi-statically compacted prior to shock loading. The Hugoniot curve for the densified material is obtained and compared with that of the uncompacted material. [Preview Abstract] |
Monday, June 25, 2007 11:00AM - 11:30AM |
B2.00003: The Dynamic Compaction of Sand and Related Porous Systems Invited Speaker: Porous and granular materials are widely found in a number of environments. One of the most important groups both geographically and in the construction industry are the sands. A review of the response of sand (42{\%} porous) and a very low-density silica dust (95{\%} porous) will be presented as well as recent data. Strain rates will be from quasi-static to the shock regime, effects such as grain size, humidity, will be discussed. \newline \newline In collaboration with David Chapman and Kostas Tsembelis, Cavendish Laboratory, University of Cambridge; Philip Church and Ian Cullis, QinetiQ, Fort Halstead, UK; David Porter, Fanborogh, UK; Peter Gould, QinetiQ, Bristol; Anatoly Bragov and Andrey Lomunov, University of Nizhny Novogorod, Russia; John Borg, Marquette University, Wisconsin, USA; and John Cogar, Corvid Technology, USA. [Preview Abstract] |
Monday, June 25, 2007 11:30AM - 11:45AM |
B2.00004: On the shock response of soda lime glass Zvi Rosenberg, Neil Bourne The response of brittle materials to shock has attracted attention for the past thirty years. Yet there are still unexplained aspects to the observed behaviour. In particular it is agreed that a failure front propagates behind the shock, travelling at an approximately constant velocity. Over the past years we have used embedded sensors, remote imaging and surface velocity measurement to track these phenomena. In the present paper, lateral measurements of strain are used to track three dimensional flow occurring behind the failure front. This is related to observations of the various thresholds observed in behaviour commented upon previously. A review of the behaviour of soda lime glass under impact is presented to unify these data. [Preview Abstract] |
Monday, June 25, 2007 11:45AM - 12:00PM |
B2.00005: A study of pre-stress effect on the failure waves in glasses Andrey Savinykh, Gennady Kanel, Sergey Razorenov, A. Rajendran Results of shock-wave experiments with free and pre-stressed samples of K8 crown glass, K14 crown glass and fused quartz are presented. Controlled confinement pressure on the specimen in the range of 200 MPa to 300 MPa was provided by installing a shrink-fit metal sleeve on the lateral surface of the sample disk. The shock compression pulses of approximately triangular profile were created using thin aluminum impactors and PMMA base plates. The peak shock stresses in the range of 5.5 GPa to 8.5 GPa were sufficient to initiate the failure waves, whereas following unloading stopped the cracking. Results of measurements of the free surface velocity histories show that pre-stressing results in earlier braking of the failure wave. Thus, the compressive transversal stress increases the failure threshold that is in agreement with existing criteria of compressive fracture. The work was supported by the US Army Research Office through CRDF GAP grant number RUE2-1615-MO-06. [Preview Abstract] |
Monday, June 25, 2007 12:00PM - 12:30PM |
B2.00006: Dynamic Response of Soda-Lime Glass Invited Speaker: Soda-lime glass (SLG) is a highly available low cost glass formulation commonly used in window applications and it may have potential use in transparent ceramic armor. While there has been a great deal of work done to characterize the shock response of fused silica, the primary component of SLG, comparatively little is known about SLG itself. This paper will report the results of characterization experiments conducted at Sandia National Laboratories on a low iron content soda-lime glass commercially available from PPG Industries. Data have been collected over a wide range of stress levels from 4 to 65 GPa. Topics will include the Hugoniot response including non-linear elastic behavior, support for a high stress phase transition, material strength, and evidence for failure of the material under certain conditions. Further, the results will be compared and contrasted with related findings in fused silica as well as work on similar soda-lime glass formulations reported by other researchers. [Preview Abstract] |
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