Impacting metamaterials: the threshold for wave propagation in holey columns

Sophie Monnery, Shresht Jain, Christopher Johnson, Draga Pihler-Puzovic, Finn Box

Research output: Contribution to journalArticlepeer-review

Abstract

We study the dynamic deformation of columns containing a periodic array of holes subject to impact loading. When compressed slowly, holey columns buckle beyond a critical compressive strain and global pattern switching (from circular holes to orthogonal ellipses) occurs instantaneously. In contrast, the dynamic deformation of holey columns is driven by wave propagation; impact induces a compressive wave which buckles the ligaments surrounding a hole, nucleating a sequential pattern switching process. Subsequent void collapse, which ultimately leads to self-contact and topological modification, is driven by the moving boundary. Here, we identify the critical impact velocity above which the compression can no longer be considered quasi-static and show it depends on system size. For dynamic deformations, we show that internal displacements are independent of impact velocity and propagate at the material sound speed, whereas the topological transition wave propagates at a speed which depends on the impact velocity.

Original languageEnglish
Article number075605
JournalPhysical Review Materials
Volume8
DOIs
Publication statusPublished - 16 Jul 2024

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