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.
Highlights
Additive manufacturing by digital 3-dimensional (3-D) printing allows for layer-by-layer fabrication of multidimensional assemblies with precise control of structural features.16 By assembling materials in this fashion, organization of strut and node topologies may be used to control the mesoscale deformation mechanisms activated under load
We illustrate for the first time how shockwave dynamics can be modulated and controlled at micron-length scales in Additive manufacturing (AM) periodic porous polymer structures using in situ, timeresolved x-ray phase contrast imaging at the Advanced Photon Source
3-D printed polymer architectures were prepared in simple cubic (SC) and face-centered tetragonal (FCT) layer symmetries from a polydimethylsiloxane adhesive elastomer using a direct ink write method (Fig. 1(a))
Summary
Additive manufacturing by digital 3-dimensional (3-D) printing allows for layer-by-layer fabrication of multidimensional assemblies with precise control of structural features.16 By assembling materials in this fashion, organization of strut and node topologies may be used to control the mesoscale deformation mechanisms activated under load. Multi-frame X-ray Phase Contrast Imaging (PCI) was used to observe the shock wave coupling with the AM foam architectures using the 24-bunch mode of the synchrotron.23 Plate impact experiments were performed on SC, FCT, and
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