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Shock structure and spall behavior of porous aluminum

Lovinger, Zev and Czarnota, Christophe and Ravindran, Suraj and Kettenbeil, Christian and Molinari, Alain and Ravichandran, G. (2020) Shock structure and spall behavior of porous aluminum. In: Shock Compression of Condensed Matter - 2019. AIP Conference Proceedings. No.2272. American Institute of Physics , Melville, NY, Art. No. 120015. ISBN 978-0-7354-4000-5.

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Porous materials under shock and impact loading present significant potential for energy absorption and shock mitigation in various applications. Furthermore, additively manufactured materials which feature inherent levels of porosity due to the manufacturing process are increasingly used in shock applications. In this work, we have investigated porous 6061 aluminum samples with different levels of porosity, which were manufactured using a modified process of 3D printing. To achieve pores smaller than the 3D printing resolution (<50 µm), the printing parameters were altered to control the pore sizes, resulting in porosities between 2%-10%. Plate impact experiments were conducted on these materials at pressures in the range of 2 to11 GPa, for which the free surface velocity was measured using a photonic Doppler velocimeter (PDV). The experiments were designed to extract both the shock structure properties and spall behavior. The structure of the steady shock was characterized as a function of porosity and shown to confirm trends revealed by the analytical approach (Czarnota et al, 2017), highlighting the importance of micro-inertia effects. The spall behavior was found to change significantly for the porous materials with respect to what was observed in dense materials. Mesoscale modeling has been carried out, to reveal the possible mechanisms underlying the observed phenomena.

Item Type:Book Section
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URLURL TypeDescription
Lovinger, Zev0000-0002-9313-9495
Ravindran, Suraj0000-0003-2930-7906
Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2020 Published by AIP Publishing. Published Online: 04 November 2020. The authors would like to acknowledge the work of Jacob Nuechterlein and Adam J. Polizzi from Elementum 3D for the design and manufacturing of the AM materials used in this work. The authors would like to thank Dr. Branden Kappes and Professor Aaron Stebner from the Colorado School of Mines for conducting micro-tomography on the porous samples.
Series Name:AIP Conference Proceedings
Issue or Number:2272
Record Number:CaltechAUTHORS:20201104-142330057
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106433
Deposited By: Tony Diaz
Deposited On:05 Nov 2020 00:42
Last Modified:16 Nov 2021 18:54

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