Issue 51

A. Chikh, Frattura ed Integrità Strutturale, 51 (2020) 115-126; DOI: 10.3221/IGF-ESIS.51.09 123 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75  K p /  2 K w =0 K w =10 K w =20 K w =50 K w =100 Figure 4: Variation of the nondimensional fundamental frequency 4 2 4 c AL EI     of isotropic homogeneous beam with Pasternak parameter p K and Winkler parameter w K . 0,0 0,5 1,0 0 6 12 18 x/L Mode (m=1) K w =0 K w =10 2 K w =10 3 Figure 5: Mode shape of w at the base surface of the beam with various aspect ratios for the first mode frequency   2 1 , / 20 , / 2.5 p m L h K    