Controlling shockwave dynamics using architecture in periodic porous materials

Abstract

Additive manufacturing (AM) is an attractive approach for the design and fabrication of structures capable of achieving controlled mechanical response of the underlying deformation mechanisms. While there are numerous examples illustrating how the quasi-static mechanical responses of polymer foams have been tailored by additive manufacturing, there is limited understanding of the response of these materials under shockwave compression. Dynamic compression experiments coupled with time-resolved X-ray imaging were performed to obtain insights into the in situ evolution of shockwave coupling to porous, periodic polymer foams. We further demonstrate shock wave modulation or “spatially graded-flow” in shock-driven experiments via the spatial control of layer symmetries afforded by additive manufacturing techniques at the micron scale.

In situ dynamic compression wave behavior in additively manufactured lattice materials

“…This has been addressed to a degree in recent publications by Hawreliak et al, 22 Winter et al, 23 and Branch et al, 24 whereby the dynamic compression response of lattices or other long-range periodic structures was elucidated. Studying the dynamic compression of such heterogenous open structures requires a more spatially resolved targeted diagnostic.…”

A Review on Mechanical Models for Cellular Media: Investigation on Material Characterization and Numerical Simulation

“…Cruttmann [ 64 ] used finite element simulations to find that cellular media mainly absorbed impact loads through internal cell deformation and collapse to attenuate stress waves. Branch [ 65 , 66 ] found that the periodically arranged cell structure [ 67 ] can adjust the elastoplasticity of a cellular medium. Cellular media materials with simple cubic structures were prone to stress concentration, which induced emission flow and attenuated impact load energy.…”

Progress in Additive Manufacturing of Energetic Materials: Creating the Reactive Microstructures with High Potential of Applications

“…Dattelbaum et al [248,249] developed the idea of 3D printing neoprene-like structures made of explosives to enhance or suppress hotspot formation. Compared to the traditional approach of controlling the mechanical sensitivity or susceptibility to detonation by changing the chemical structure (e. g., replacement of RDX with FOX-7), the considered approach is based on the variations in density and void size made during 3D printing while the chemical composition is unaltered.…”