Bulletin of the American Physical Society
20th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 62, Number 9
Sunday–Friday, July 9–14, 2017; St. Louis, Missouri
Session P7: Materials IV: Processing |
Hide Abstracts |
Chair: Jeremy Millet, AWE Room: Regency Ballroom F |
Wednesday, July 12, 2017 11:15AM - 11:30AM |
P7.00001: Shock Wave Propagation in Functionally Graded Mineralized Tissue Matthew Nelms, Wayne Hodo, Ken Livi, Alyssa Browning, Bryan Crawford, A.M. Rajendran In this investigation, the effects of shock wave propagation in bone-like biomineralized tissue was investigated. The Alligator gar \textit{(Atractosteus spatula)} exoskeleton is comprised of many disparate scales that provide a biological analog for potential design of flexible protective material systems. The gar scale is identified as a two-phase, (1) hydroxyapatite mineral and (2) collagen protein, biological composite with two distinct layers where a stiff, ceramic-like ganoine overlays a soft, highly ductile ganoid bone. Previous experimentations has shown significant softening under compressive loading and an asymmetrical stress-strain response for analogous mineralized tissues. The structural features, porosity, and elastic modulus were determined from high-resolution scanning electron microscopy, 3D micro-tomography, and dynamic nanoindentation experiments to develop an idealized computational model for FE simulations. The numerical analysis employed Gurson's yield criterion to determine the influence of porosity and pressure on material strength. Functional gradation of elastic moduli and certain structural features, such as the sawtooth interface, are explicitly modeled to study the plate impact shock profile for a full 3-D analysis using ABAQUS finite element software. [Preview Abstract] |
Wednesday, July 12, 2017 11:30AM - 11:45AM |
P7.00002: Dynamic damage evolution in Lean Duplex Stainless Steel 2101 Juan Pablo Escobedo, Ali Ameri, Andrew Brown, Mahmud Ashraf, Paul Hazell, Md. Zakaria Quadir The dynamic tensile response and associated microstructural evolution of lean duplex stainless steel 2101 (LDSS 2101) have been investigated. Plate impact experiments to peak compressive stresses in the 2-6 GPa range were conducted on annealed as well as previously quasi-statically deformed LDSS 2101 specimens. The post-impact microstructural characterization was investigated by optical microscopy, X-ray diffraction (XRD) and electron-backscattered diffraction (EBSD). Correlations between features in free surface measurements, e.g. spall strength, and dynamic damage development (void nucleation, growth and coalescence) for specimens with varying amounts of plastic deformation will be presented. [Preview Abstract] |
Wednesday, July 12, 2017 11:45AM - 12:00PM |
P7.00003: Material strength measured by flyer-impact perturbation method Xiaojuan Ma, Paul Asimow, Oleg Fatyanov, FuSheng Liu Yield strength is one of the most important physical properties of a solid material, especially far from its melting line. The flyer-impact perturbation method measures material yield strength on the basis of correlation between the yield strength under shock compression and the damping of oscillatory perturbations in the shape of a shock front passing through the material. We used flyer-plate impacts experiments on targets with machined grooves on the impact surface to shock aluminum to between 32 and 71 GPa and recorded the evolution of the shock front perturbation amplitude in the sample with electric pins and fibers. Simulations using the elastic-plastic model can be matched to the experiments, explaining well the form of the perturbation decay and constraining the yield strength of aluminum to be 1.3-3.1 GPa. These results are in agreement with values obtained from reshock and release wave profiles as well as the result deduced from the SCG model. We conclude that the flyer-impact perturbation method is indeed a reliable means to measure material strength. [Preview Abstract] |
Wednesday, July 12, 2017 12:00PM - 12:15PM |
P7.00004: Electrical response of KNN lead free ferroelectric ceramics under shock compression. Fuping Zhang, Yusheng Liu, Hongliang He PZT 95/5 ferroelectric ceramics has been utilized for the use in shock driven pulsed power supplies for many years. Considering KaNaNbO3 (KNN) has the almost same phase in phase diagram as PZT, KNN is the candidate material for the use in shock driven pulsed power supplies. Comparing with PZT 95/5, KNN is a green environment friendship material with a low density. The electrical response of KNN under shock compression had been studied. Results show that the shock stress is below 3.0 GPa, the depoled current have two platforms, the first platform has the high value, the second platform has the low value and the depoled charge is lower than the total charge of KNN, which means uncompleted discharge of KNN. When the shock stress increased above 3.0 GPa, the depoled current has one platform and the depoled charge is almost the same as the total charge of KNN. The two platforms in current may be formed by two phase transitions under shock compression, the detailed phase transition need further researches. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700