TY - JOUR
T1 - Impacting metamaterials: the threshold for wave propagation in holey columns
AU - Monnery, Sophie
AU - Jain, Shresht
AU - Johnson, Christopher
AU - Pihler-Puzovic, Draga
AU - Box, Finn
PY - 2024/7/16
Y1 - 2024/7/16
N2 - 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.
AB - 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.
U2 - 10.1103/physrevmaterials.8.075605
DO - 10.1103/physrevmaterials.8.075605
M3 - Article
SN - 2475-9953
VL - 8
JO - Physical Review Materials
JF - Physical Review Materials
M1 - 075605
ER -