Issue 49

A. Bendada et alii, Frattura ed Integrità Strutturale, 49 (2019) 655-665; DOI: 10.3221/IGF-ESIS.49.59 659 xy G xz G yz G 0 y  0.0 x U mm  0 z  0.0 x U mm  0 z  0.0 x U mm  0.0 y U mm  0.0 y U mm  0.0 y U mm  0.0 z U mm  0.0 z U mm  0.0 z U mm  y y L  1.0 x U mm  z z L  1.0 x U mm  z z L  0.0 x U mm  0.0 y U mm  0.0 y U mm  1.0 y U mm  0.0 z U mm  0.0 z U mm  0.0 z U mm  Table 5 : Shear boundary conditions. xy G xz G yz G Table 6 : RVE 0 undeformed shape, RVE 1 deformed shape in each case of shear simulation. Analytical and numerical results In Tab. 7, comparison between analytical and numerical results. It’s clearly seen that the obtained numerical equivalent parameters give a good agreement. Constant parameters Gibson ANSYS Error (%) x E ( MPa ) 2 5.989 10   2 5.99 10   0.016 y E ( MPa ) 2 5.989 10   2 5.96 10   0.484 z E ( MPa ) 575.006 594.167 3.33 xy G ( MPa ) 2 1.497 10   2 1.475 10   1.46 xz G ( MPa ) 107.277 113.223 5.54 yz G ( MPa ) 107.277 105.645 1.52 xy  1 1 0.00 yz  5 3.54 10   5 3.33 10   5.93 xz  5 3.54 10   5 3.36 10   5.08 Table 7 : Equivalent elastic properties of honeycomb core. N UMERICAL MODAL ANALYSIS o study the vibrational behavior of completely free honeycomb sandwich plate, 3-D model of panel is built and consists of thick core which is homogenized to orthotropic volume in the previous section, and thin face sheets joined with a core (Fig. 3). It is meshed using solid element (SOLID185, BRICK 8node185) and consisted of 4620 T