New viscoelastic circular cell honeycombs for controlling shear and compressive responses in oblique impacts

Fady F. Abayazid, Diagarajen Carpanen, Mazdak Ghajari

International Journal of Mechanical Sciences, 2022

Abstract

Cellular structures such as honeycombs are used to manage impact loads in many engineering applications, where often the impact load is oblique (non-axial). Although these structures have been extensively studied under axial impacts, a key question remains largely unaddressed: How may their axial and shear responses be independently tailored for oblique impacts? Here we test whether incorporating curvature in the form of axisymmetric shape changes in the cell walls of viscoelastic circular cell honeycombs enables independent control over their shear and compressive responses during oblique impacts. We developed detailed finite element models of the circular cell honeycombs made of the 3D printable viscoelastic material Agilus. Using a new rig, we validated the predictions of the finite element models under oblique impacts. We performed a full-factorial computational design-of-experiments, varying the cell shape from concave to convex with different amplitudes and impact velocities from 2.5 to 7.5 m/s in order to determine their effects on the shear and compressive responses of the honeycombs under oblique impacts. The finite element models demonstrate remarkable agreement with…

Cite as (BibTeX)

@article{abayazid-2022-new-viscoelastic-circular-cell,
  title={New viscoelastic circular cell honeycombs for controlling shear and compressive responses in oblique impacts},
  author={Fady F. Abayazid and Diagarajen Carpanen and Mazdak Ghajari},
  journal={International Journal of Mechanical Sciences},
  year={2022},
  doi={10.1016/j.ijmecsci.2022.107262}
}