Bulletin of the American Physical Society
18th Biennial Intl. Conference of the APS Topical Group on Shock Compression of Condensed Matter held in conjunction with the 24th Biennial Intl. Conference of the Intl. Association for the Advancement of High Pressure Science and Technology (AIRAPT)
Volume 58, Number 7
Sunday–Friday, July 7–12, 2013; Seattle, Washington
Session O1: ME.3 Inelastic Deformation, Fracture, and Spall IV |
Hide Abstracts |
Chair: Dawn Flicker, Sandia National Laboratories Room: Grand Ballroom I |
Wednesday, July 10, 2013 9:15AM - 9:45AM |
O1.00001: High rate deformation mechanisms and dynamic failure, experiment and theory overview Invited Speaker: K.T. Ramesh |
Wednesday, July 10, 2013 9:45AM - 10:00AM |
O1.00002: The Role of Defect Kinetics on Spall Failure Justin Wilkerson, K.T. Ramesh Spall failure is a complex multiscale, multirate process. During the shock compression, the material undergoes a myriad of shock stress magnitude and pulse duration dependent microscopic processes that may include dislocation multiplication, nucleation, trapping, pile-up, annihilation, recovery, cell evolution, as well as vacancy generation and clustering. In addition to shock hardening the material, this new shock induced defect structure seeds the material with new potential void nucleation sites that may be activated during the proceeding period of dynamic tensile loading. Upon nucleation, the voids undergo dynamic growth to coalescence, constrained by inertia and viscoplastic resistance to deformation. A predictive micromechanical model is developed to analyze the role of these time-dependent processes in the experimentally observed spall strength dependence on initial microstructure, preheat temperature, tensile loading rate, and shock stress magnitude. In addition, simple spall strength scaling laws that capture the essential physics and microstructure dependence will be presented. [Preview Abstract] |
Wednesday, July 10, 2013 10:00AM - 10:15AM |
O1.00003: ABSTRACT WITHDRAWN |
Wednesday, July 10, 2013 10:15AM - 10:30AM |
O1.00004: Experimental investigation of shock-wave processes in solid and liquid paraffin Alexander Utkin, Vasiliy Sosikov Paraffin response to shock-wave stressing at transition through melting temperature have been researched. The homogenized paraffin and docosane (C$_{22}$H$_{46})$ were investigated at initial temperature of 20 and 70 $^{\circ}$C. Compression pulse amplitude was changed from 0.2 to 2 GPa. Registration of free surface velocity was made with VISAR laser interferometer. It was shown that phase transition of paraffin from solid to liquid state does not lead to appearance of any features on wave profiles. Spall strength remains constant an it is equals to about 25 MPa independent to state of sample. Significantly different results were achieved in experiments with docosane. In liquid phase velocity profiles are similar to paraffin but the spall strength is higher and equals to 40 MPa. In solid state the spall strength halves, and dramatic change of compression pulse structure is observed. If in liquid phase shock jump forms, then in solid state two wave configuration is recorded. Moreover the front of compression pulse expands during propagation. It means that solid docosane has an elastic property which leads to formation of forerunner and its compressibility is anomalous at low pressures. [Preview Abstract] |
Wednesday, July 10, 2013 10:30AM - 10:45AM |
O1.00005: Study on Dynamic Fragmentation of Multiple Metal Rings under High Explosive Loading Tiegang Tang, Guowu Ren, Zhaoliang Guo, Qingzhong Li An experimental platform for metal expanding ring incorporating with exploding wire technique is set up to improve the instability of high explosive laoding. The experimental designs including the circuit control and test performance are illustrated in great detail. Furthermore, on the basis of this technique we investigate dynamic fragmentation of multiple rings stacked on a metal driver. The statistical distribution of recovered fragments is discussed. [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