Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session U05: Damage and Spall IIRecordings Available
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Chair: Veronica Anghel, Los Alamos National Laboratory Room: Anaheim Marriott Platinum 3 |
Thursday, July 14, 2022 11:00AM - 11:15AM |
U05.00001: Quasi-Brittle Fracture of Beryllium: Model and Validation JeeYeon N Plohr, Thomas Canfield A brittle fracture model, QBrT describes ductile-brittle transition in metal without an initiation criterion. It is a mechanism-based, continuum-level model that uses the damage tensor and parameters to degrade the stiffness tensor under tensile loading. A viscoplasticity model is also incorporated in QBrT to fully account for the material behavior in a wide range of strain rates and temperatures. Quasi-brittle materials, beryllium and stainless-steel, 304L are considered as applications, and we show the simulation results of flyer plate and the experimental data, which are in good agreement. |
Thursday, July 14, 2022 11:15AM - 11:30AM |
U05.00002: Modelling ductile fracture at high strain rates in shear sensitive materials Nicola Bonora, Gabriel Testa, Sara Ricci, Gianluca Iannitti, Andrew Ruggiero Several ductile alloys show an equivalent fracture strain in pure shear significantly lower than the that for uniaxial tensile stress. This behavior as be ascribed, beside the reduced number of slip systems, to the concurring contribution to ductile fracture process of intervoid sheeting mechanism. Under high strain rate loading, this mechanism can be promoted further by temperature effect resulting from quasi-adiabatic condition. Recently, Bonora and Testa (2022) developed a plasticity damage self-consistent (PDSC) model, which incorporates stress triaxiality and Lode angle controlled fracture mechanisms, reconciling CDM theoretical framework with ductile fracture mechanisms and their sequential progression under general loading conditions. In this work, PDSC model has been used to model ductile fracture in Al2024-T351 under different stress state conditions at high strain rates including dynamic compression in hat-shaped specimen, Taylor cylinder impact and plate impact experiments. The ability of the proposed model to accurately predict the overall specimen response as well as ductile fracture initiation and propagation, and fracture mode is shown. |
Thursday, July 14, 2022 11:30AM - 11:45AM |
U05.00003: Statistical distribution of mechanical properties to initiate adiabatic shear banding in thick walled collapsing cylinders Mathieu Xavier, Cyril Bolis Adiabatic shear bands (ASB) are observed in the vast majority of ductile metals subjected to extreme loadings. They are characterized by narrow zones (few micro-meters) where a localization of shear deformation occurs, and are often associated with peaks of temperature as in highly dynamic cases, heat conduction does not smooth the temperature field. |
Thursday, July 14, 2022 11:45AM - 12:00PM |
U05.00004: Understanding void growth at grain boundaries Paul G Christodoulou, Miroslav Zecevic, Ricardo A Lebensohn, Irene J Beyerlein Void growth and coalescence during spall failure in shock-loaded materials are dependent on the microstructure and deformation of the material surrounding their nucleation sites. To understand the growth of voids under deformation, scientists have turned to 3D micromechanics modeling to ascertain the combined effects of microstructure and voids on mechanical properties. It is often observed that voids grow preferentially in certain regions of the microstructure, such as in certain grains and at grain boundaries. Yet, the role of these features on void growth is not well understood. In this presentation, we will use a large strain elastic-viscoplastic crystal plasticity model implementation in an FFT-based solver (LS-EVPFFT) to simulate void growth in relation to its surrounding material. The calculations are designed to elucidate the roles of crystallography, grain boundary inclination, and grain boundary misorientation on void growth at grain boundaries. In simulation, we consider an FCC metal as a model material but the approach can apply to metals of other crystal structures. The growth of these GB voids, focusing on both total growth and growth into each individual grain, are compared to the growth of intragranular voids in single crystals. |
Thursday, July 14, 2022 12:00PM - 12:15PM |
U05.00005: Shock compression and spall of additively manufactured Ti-5553 alloy William W Anderson, Brian J Jensen, Dennis A Miller, Veronica Anghel, John S Carpenter, Ben Brown The advent of additive manufacturing (AM) has opened a wide range of possibilities for producing materials and parts using AM techniques that require much less time and cost than traditional manufacturing techniques. One alloy of interest is Ti5553 (Ti-5Al-5Mo-5V-3Cr). We have recently conducted shock compression and spall experiments on Ti5553 produced by an AM process and subjected to a series of heat treatments to cause varying amounts of the as-manufactured β-phase to convert to the α-phase. The results of these experiments and accompanying ambient pressure measurements indicate significant anisotropy in the as-manufactured material that decreases with subsequent heat treatment. The results of our experiments will be discussed in the context of previously published studies on this alloy. |
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