Shock compression behavior of stainless steel 316L octet-truss lattice structures

Weeks, John S.; Gandhi, Vatsa; Ravichandran, G.

doi:10.1016/j.ijimpeng.2022.104324

Cited by 16 publications

(2 citation statements)

References 40 publications

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“…As shown in impact explorations on metallic foams, the propagation of a 1D compaction shock takes place in cellular materials even at moderate impact velocities below 300 m/s ( 28 , 29 , 33 , 41 , 54 ). Studies have also shown that quasi-static uniaxial compression properties are useful in predicting characteristics of dynamic uniaxial compression ( 28 , 29 ), such as quasi-static yield strength

as an appropriate approximation for the stress ahead of the compaction front.…”

Section: Decoupling Dissipation Mechanismsmentioning

confidence: 93%

“…In the moderate dynamics regime, spanning strain rates from 10 1 to 10 3 s −1 and enabled by Kolsky-bar or direct-impact setups, studies have identified additional deformation mechanisms via compaction fronts or tailored geometries, which ultimately lead to enhanced energy dissipation metrics ( 28 , 29 , 32 ). Recent studies on impact in architected materials have further investigated how compaction shocks in periodic-truss architectures ( 33 , 34 ), plate-based architectures ( 35 , 36 ), and triply periodic minimal surfaces ( 37 ) further enhance impact resistance. At strain rates spanning 10 3 to 10 5 s −1 , direct-impact experiments using powder and gas guns have explored shock hardening and coupled phenomena such as adiabatic heating under these extreme conditions ( 37 – 40 ).…”

mentioning

confidence: 99%

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Decoupling particle-impact dissipation mechanisms in 3D architected materials

Butruille,

Crone,

Portela

2024

Proc. Natl. Acad. Sci. U.S.A.

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Ultralight architected materials enabled by advanced manufacturing processes have achieved density-normalized strength and stiffness properties that are inaccessible to bulk materials. However, the majority of this work has focused on static loading and elastic-wave propagation. Fundamental understanding of the mechanical behavior of architected materials under large-deformation dynamic conditions remains limited, due to the complexity of mechanical responses and shortcomings of characterization methods. Here, we present a microscale suspended-plate impact testing framework for three-dimensional micro-architected materials, where supersonic microparticles to velocities of up to 850 m/s are accelerated against a substrate-decoupled architected material to quantify its energy dissipation characteristics. Using ultra-high-speed imaging, we perform in situ quantification of the impact energetics on two types of architected materials as well as their constituent nonarchitected monolithic polymer, indicating a 47% or greater increase in mass-normalized energy dissipation under a given impact condition through use of architecture. Post-mortem characterization, supported by a series of quasi-static experiments and high-fidelity simulations, shed light on two coupled mechanisms of energy dissipation: material compaction and particle-induced fracture. Together, experiments and simulations indicate that architecture-specific resistance to compaction and fracture can explain a difference in dynamic impact response across architectures. We complement our experimental and numerical efforts with dimensional analysis which provides a predictive framework for kinetic-energy absorption as a function of material parameters and impact conditions. We envision that enhanced understanding of energy dissipation mechanisms in architected materials will serve to define design considerations toward the creation of lightweight impact-mitigating materials for protective applications.

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