PSI - Issue 33

Panagiotis N. Lymperopoulos et al. / Procedia Structural Integrity 33 (2021) 818–823 Panagiotis Lymperopoulos, Efstathios Theotokoglou/ StructuralIntegrity Procedia 00 (2021) 000–000

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nature is imperfected considering an homogenous material, thus starting points for crack propagation. The aim of this study is a first investigation of crack propagation in pentamodes structures.

Nomenclature F

Force at the crack tip Applied displacement

δ a d

The main dimension of pentamodes structure, which is related to porosity

Small diameter Large Diameter

D

2. Theoretical Consideration In this study, a typical pentamodes structure is used, as the one that can be seen in Fig. 1.

Fig. 1. Typical pentamodes structure

A typical mode I crack propagation testing is taken place. A typical testing specimen was considered by the work of (Hedayati et al. (2017)).

Fig. 2. Testing specimen

The specimen (Fig. 2) is filled with pentamodes all over the volume. Three different cases were tested (Table 1).