Hydrophysics

Hydrophysics

Low velocity impact analysis of meta-sandwich panels with different cores

Document Type : Original Article

Authors
Mitra Ghavanloo 1
Ali Abdollahifar 2
1 Faculty of Naval Aviation, Malek- Ashtar University of Technology, Shiraz ,Iran
2 Faculty of Naval Aviation, Malek-Ashtar University of Technology, Shiraz, Iran
Abstract
The bottom of floats and flying boat should be strong against impact loads such as low velocity impact despite being light weight. In this article, we will investigate the dynamic behavior of the structure of meta-sandwich panels with different cores under low velocity impact loading using analytical and numerical methods. Four different core samples including honeycomb, auxetic, square and triangular made of polylactic acid under impact, a hemispherical steel projectile with a radius of 15 mm with fixed boundary conditions have been investigated. The interaction between the impactor and the meta-sandwich panel has been modeled using a two-degree-of-freedom mass and spring system using finite element software such as ANSYS Workbench. The maximum impact contact force is also analytically and numerically compared with each other and the results show a good match between these two methods. Considering the importance of the effective parameters in the dynamic response of the sandwich panel structure, the effect of some parameters, including the velocity and mass of the impactor, on the maximum contact force, the maximum displacement and the maximum Von Mises stress were numerically investigated and evaluated. The results show that impactor velocity effects are a more important factor in increasing and decreasing contact force, displacement, Von Mises stress and impact time compared to impactor mass. In the end, by comparing the different cores presented in this article, the auxetic core is introduced as the best core among other cores.
Keywords
Meta-sandwich panels
mechanical metamaterials
finite element method
low velocity impact
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  • Receive Date 10 December 2023
  • Revise Date 30 December 2023
  • Accept Date 21 January 2024