Issue 53

A. Chatzigeorgiou et alii, Frattura ed Integrità Strutturale, 53 (2020) 306-324; DOI: 10.3221/IGF-ESIS.53.24 318 considered to be in plane strain condition, and the material was a commercial Plexiglas (cyro acrylic FF Plexiglas MC). The equivalent dimensions in the international system of units (SI), as well as the material properties (in SI also), are shown in Fig.16. Contours Number of elements K I ( MPa mm ) % error Κ ΙΙ ( MPa mm ) % error 1 15068 151.5 0.90 53.2 5,03 2 10553 151.9 1.21 53.1 4,92 3 7750 152.0 1.27 53.2 5,01 4 5984 152.1 1.28 53.2 5,00 5 4763 152.0 1.28 53.2 5,01 Table 5: Results between FEMAP and Analytical method by changing the number of contours. Figure 16: Specimens from the experimental procedure [30]. In Fig.17 is presented the path of the first specimen, that produced by the proposed code into FEMAP, and the comparison with the experimental path. For the FEA, about 5450 plane elements (6 node triangular, and 8 node quadrilateral) with global mesh size 0.2 mm have been used. It appears that the results are very close. In Fig.18 is shown the second specimen and the comparison of the results. In the second specimen, about 6560 plane elements with global mesh size 0.1mm have been used, and the trajectories are almost identical.