Issue 51

A. Falk et alii, Frattura ed Integrità Strutturale, 51 (2020) 541-551; DOI: 10.3221/IGF-ESIS.51.41 546 Figure 5 : Finite Element Mesh. Figure 6 : FEA results for maximum principal strains: a) Loading case 1 - FR4 experimental determined; b) Loading case 1 - FR4 Ansys database; c) Loading case 2- FR4 experimental determined; d) Loading case 2 - FR4 Ansys database. The influence of material properties of FR4 (experimental and from ANSYS database) has low effect on the results. It could be observed higher values of maximum principal strains on the path A1-A2 for the Loading case 2, respectively Lode case 1 for D1-D2 path. On this path, the maximum principal strains exceeded the 700 microstrain limit for Loading case 1 through the path, and on part of the path (between 0 to 7 mm) for Loading case 2.