PSI - Issue 47

Panagiotis N. Lymperopoulos et al. / Procedia Structural Integrity 47 (2023) 274–281 Panagiotis N. Lymperopoulos, Efstathios E. Theotokoglou/ Structural Integrity Procedia 00 (2022) 000–000

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According to Fig. 4 it is noted that as the height of the pentamode increases the G c appear to decrease (Fig. 4). Furthermore, for n z =4, some discrepancies of G c are observed. According to Fig. 5, E c has higher value for small pentamode heights. In the following Figs. 6 and 7, a comparison between the G c and E c values for pentamodes with different heights and with confinement plates is also made.

Fig. 6. G c for different pentamode heights

Fig. 7. E c for different pentamode heights

According to Fig. 6 as n z increases the G c decreases. In addition, for n z (=3,4) some discrepancies of G c are observed. It is also observed (Figs. 4-7) that pentamodes with confinement plates appear higher values of G c and E c . In the case of a thinner rod (D/a= 0.0209), a comparison of G c and E c for pentamodes without and with confinement plates, is also made in Figs. 8-11. At first the comparison of G c and E c for pentamodes without confinement plates is made (Figs. 8, 9).