PSI - Issue 26

Panagiotis N. Lymperopoulos et al. / Procedia Structural Integrity 26 (2020) 263–268 Panagiotis N. Lymperopoulos, Efstathios E. Theotokoglou/ StructuralIntegrity Procedia 00 (2019) 000 – 000

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In the sequel, from the computational analysis the ratio of the shear strength of a pentamode G c over the shear strength of a typical isolator G r , (G c /G r ) is presented under small and large displacements finite element analyses for the two materials steel and polymer ( Figures 4, 5 ), where the plot in Figure 5 is logarithmic. It can be concluded that the use of large displacements analysis gives higher values for the steel, and lower values for the polymer.

Fig. 4 Calculation of G c /G r for the steel material

Fig. 5 Calculation of G c /G r for the polymer material

For the different diameters of pentamodes (D, d), with height (4 ∗ a), in the case of small displacements finite element analyses, the results for the forces in the nodes at the bottom of the pentamode and the calculation of the ratio G c /G r are given in Figures 6 and 7. The results in Figure 7 are presented in a logarithmic plot.