Bulletin of the American Physical Society
17th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 56, Number 6
Sunday–Friday, June 26–July 1 2011; Chicago, Illinois
Session Z3: Particulate/Porous Materials IV: Experimental |
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Chair: Kit Neel, Air Force Research Laboratory Room: Renaissance Ballroom AB |
Friday, July 1, 2011 11:00AM - 11:15AM |
Z3.00001: On predicting the shock densification response of heterogeneous powder mixtures Naresh Thadhani, Anthony Fredenburg Predicting the dynamic crush-up response of heterogeneous powder mixtures is vital to the design of high-strain-rate experiments. A methodology has been developed which utilizes an experimentally obtained stress-density response in the low-strain-rate (quasi-static) regime to predict the dynamic densification response of heterogeneous powder mixtures. Specifically, the compaction behavior of an equivolumetric Ta + Fe2O3 mixture is investigated. Experimental data is analyzed within the scope of existing continuum level compaction models, where the present combination and manipulation thereof allows for an accurate prediction of the dynamic crush-up response of Ta + Fe2O3 powder mixtures. Discussion is also given regarding model extension to alternate systems. [Preview Abstract] |
Friday, July 1, 2011 11:15AM - 11:30AM |
Z3.00002: One-Dimensional Strain Initiated by Rapid Compaction of a Heterogenous Mixture Cullen Braun, John Borg The aviation industry manufactures brake-pads from a multi-component mixture of copper, iron, silica, graphite, molybdenum-disulfide and tin. The work presented here investigates the possibility of utilizing dynamic compaction in this manufacturing process and compares the end state morphological differences and damage mechanisms between samples prepared by static pressing and sintering or dynamic compaction without sintering. Statically compressed and sintered samples were obtained from a commercial vendor, whereas green samples were prepared at Marquette University in a hydraulic press up to pressures of 0.03 GPa. Dynamically compressed samples were prepared in the one-inch gas gun at Marquette University up to pressures of 0.5 GPa. The end state morphology of all of the samples was investigated using a scanning electron microscope and electron dispersive spectroscopy. From the dynamics experiments a bulk Hugoniot was obtained and used in a numeric investigation of the compaction process. Both bulk and mesoscale simulations were used to not only reproduce the bulk Hugoniot but also to investigate damage mechanisms. It was found that the dynamically compressed samples had large regions of sintered grains with lateral fractures resulting from release. [Preview Abstract] |
Friday, July 1, 2011 11:30AM - 11:45AM |
Z3.00003: Dynamic Crush-up Response of CeO$_{2}$ Anthony Fredenburg, Darcie Dennis-Koller, Dana Dattelbaum The shock consolidation and dynamic response of varying morphology (10$^{-1}$ to 10$^{1}$ $\mu$m) CeO$_{2}$ is investigated through a series of parallel plate impact experiments. At pressures below those required to reach full density, the effect of morphology on the compaction response is examined for samples with similar initial densities. Shock velocity is measured directly, from which the pressure-volume response in the specimen is calculated; experimental results are discussed within the context of existing compaction models. Further, an embedded gauge technique is used to obtain several measurements of the sound speed at pressure for a single morphology at an alternate initial density. Measurements of the sound speed at pressure are used in conjunction with Hugoniot measurements to estimate the Gruneisen parameter for CeO$_{2}$. [Preview Abstract] |
Friday, July 1, 2011 11:45AM - 12:00PM |
Z3.00004: ABSTRACT WITHDRAWN |
Friday, July 1, 2011 12:00PM - 12:15PM |
Z3.00005: The influence of particle morphology on the dynamic densification of metal powders Daniel Eakins, David Chapman Powders are well known for their dispersive properties, which derive from the many dissipative processes that occur during densification. While numerous studies have been devoted to understand these processes over a wide range of initial densities, far fewer have considered the influence of particle morphology. In this talk, we will discuss ongoing research to further investigate the role of starting configuration on the dynamic densification of metal powders. Crush-up curves for Cu, Ni, and 316L stainless steel powders of equiaxed, flake, and needle-shaped morphology have been constructed through plate-impact experiments. Results suggest a strong relationship between particle morphology and the stress required to reach full density. We apply a modified contact-point model to relate the differences in crush-up behavior on the basis of physical parameters, such as particle shape and surface area. [Preview Abstract] |
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