Dynamic Computational Analyses of Pentamodes Structures

Pentamodes metamaterials are lattice structures with peculiar properties. Their main characteristic is the low ratio of bulk to shear strength, which make them suitable for antiseismic design, bioengineering and aerospace applications. At first, analyses of pentamode structures under static conditions have been performed. Due to wave propagation in structures, an investigation taking into consideration the harmonical nature of waves should be made. In this study a computational analysis, via the finite element method takes place in order to analyze the shear strength of pentamodes under harmonical loading conditions. The frequency band of the harmonical loading is between 0Hz to 10 Hz, which is the band of seismic waves. Special investigation is also made for frequency bands between 0Hz and 2Hz where the more catastrophic phenomena occurred. Finally in our study, the shear and the bulk strengths of pentamode structures are numerically calculated under harmonical loading conditions for different frequency bands.