13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- Figure 6. Deformed shape of the core when a relative displacement of 1 mm between the vertical sides is imposed The results presented in Figs. 6 and 7 show that ( ) 0.145 0.371 0.226 , = Δ = − − y I L mm, and ( ) 0.159 0.318 0.159 , = Δ = − − x II L mm. Taking into account that Δ =Δ = y II x I L L , , 1 mm and that L L a y x = = , from (1) resulted 0.371 =− xyν and 0.318 =− yx ν . These negative values show that the core which will be used to build the sandwich panel has auxetic properties. Figure 7. Deformed shape of the core when a relative displacement of 1 mm between the horizontal sides is imposed 4. Results of the FEA in the case of the panel under lateral pressure 4.1. Case of panel simply supported on the contour The applied loading is a lateral pressure of 0.07 MPa. The obtained results are given in Table 1 and in Figs. 8-13.
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