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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Dynamic Behavior of Materials VIII
Presentation Title Orientation Dependence of the Shock Response and Spall Fracture of Tantalum
Author(s) David R Jones, Saryu J Fensin, Carl P Trujillo, George T Gray
On-Site Speaker (Planned) David R Jones
Abstract Scope For ductile metals, the process of dynamic fracture occurs through nucleation, growth and coalescence of voids.  In order to understand the role of one type of heterogeneity, grain boundaries, on void nucleation it is important to work on controlled bi-and tri-crystal type samples.   In this work, we present experiments where extremely coarse-grained tantalum samples are shock-loaded and released such that both the compressive response and the resistance to spall fracture (dynamic tensile damage) can be measured.  The material was produced with a Sciaky Electron Beam Additive Manufacturing (EBAM) system.  The high temperatures and very slow cooling rates associated with this technique provide favorable conditions for grain growth.  Samples were selected and sectioned to allow shock loading along the [100], [110] and [111] directions in a single plate-impact experiment, ensuring the loading conditions were identical.  The Hugoniot elastic limit and spall strength was measured for each direction.  The resulting damage distribution and kinetics are discussed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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