Issue 30

D. Tumino et alii, Frattura ed Integrità Strutturale, 30 (2014) 317-326; DOI: 10.3221/IGF-ESIS.30.39 323 Figure 5 : Experimental results of the variable span TPB tests on x- and y-type sandwich beams. Figure 6 : Experimental setup for the TPB tests. x-type beam Span [mm] 620 570 520 470 x D [Nmm] Qx D [N/mm] ' x D [Nmm] 3.9E6 3.8E6 3.7E5 3.57E3 4.43E6 9.96E2 y-type beam Span [mm] 721 671 621 571 y D [Nmm] Qy D [N/mm] ' y D [Nmm] 5E6 4.9E6 4.7E5 4.66E3 5.76E6 8.42E2 Table 3 : Results of TPB tests on x- and y-type sandwich beams: apparent and corrected values of stiffness. Application to coupled mode cases In the cases studied so far, only uncoupled load configurations were analysed. Aim of this work is to give a versatile numerical tool able to simulate a complex case where coupling between flexural deformation in x and y direction and torsional deformation can occur. For this reason two cases have been simulated for which no closed form solution exist. Both loading schemes depicted in Fig. 8 are characterized by the presence of multiple terms in the matrix D. y = 4.70E-09x + 2.51E-04 0.0012 0.0013 0.0014 0.0015 0.0016 0.0017 0.0018 0.0019 0.002 0.0021 200000 250000 300000 350000 400000 w/PL [mm/N] L 2 [mm 2 ] x-type beam y = 3.61E-09x + 2.97E-04 0.0012 0.0014 0.0016 0.0018 0.002 0.0022 0.0024 300000 350000 400000 450000 500000 550000 w/PL [mm/N] L 2 [mm 2 ] y-type beam