Issue 27

H. Liu et alii, Frattura ed Integrità Strutturale, 27 (2014) 53-65 ; DOI: 10.3221/IGF-ESIS.27.07 61 All results that contained the node, element, constraint, and boundary information were written in the relaxation file, which were prepared for the explicit analysis. Figure 10 : The equivalent stress distribution of the implicit analysis. Explicit analysis Boundary conditions, initial conditions, and contact parameters were redefined on the basis of the actual situation after the relaxation file was initialized. A terminal velocity of 1.85 m/s, which was calculated using the CFD method, was applied to define the initial velocity of the impacting body. An impacting body mass of 63 kg was used to define the inertia options. (a) First-principle stress (b) First-principle stress (c) Equivalent stress (d) Equivalent stress Figure 11: Typical stress distributions of the explicit analysis . (a) and (b) are first-principle stress distribution; (c) and (d) are equivalent stress distribution. The typical results of the explicit analysis are shown in Figs. 11(a–d). Figs. 11(a and b) and 11(c and d) show the first- principle and equivalent stress distributions at different times, respectively. In Fig. 11(a), the maximum first-principle