13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- It is to be noticed that the maximum von Mises equivalent stresses are lower than the allowable stress values in all the materials. The sandwich plate has a high stiffness as indicated by the maximum deflection (2.589 mm) and a high fundamental eigenfrequency (365 Hz). There is no risk to lose the stability of the plate as the coefficient of safety is 5.97 for the first local buckling mode. Fig. 13 shows a non-uniform distribution of the reactions along the supported contour, thus being explained the increased values of the stresses towards the middle sides of the sheet (Fig. 9). Figure 8. Deformed shape of the panel Figure 9. Equivalent stresses in the aluminum sheets Figure 10. Equivalent stresses into the core Figure 11. Equivalent stresses into the adhesive Figure 12. First mode of local buckling Figure 13. Distribution of the support reactions on the contour of the panel 4.2. Case of panel simply supported on the sides AB and CD (Fig. 4) The lateral pressure is 0.05 MPa. The obtained results are presented in Table 1 and in Figs. 14-17.
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