Issue 45

L. Zou et alii, Frattura ed Integrità Strutturale, 45 (2018) 53-66; DOI: 10.3221/IGF-ESIS.45.05 60 2 6 bh  = (9) Finite element model of T-joints Material properties used in the FE analysis are shown in Tab.7 and the finite element type is C3D8R. The size of the mesh refinement will not influence the calculation result of the nodal force based structural stress and the element size is not unified here. According to the size of the specimens of 5A06+5083 T-joint and 5A06+5A06 T-joint, the corresponding finite element model is established as shown in Fig. 5 and Fig. 6. Position of the fulcrum in the test is determined according to JBT 7716-1995. For the 5A06+5083 T-joints, the span of fulcrum is 60 mm, and for the 5A06+5A06 T- joints, the span of fulcrum is 100mm. The loading mode of the 5A06+5083 T-joint is shown in Fig. 7. Material Density (Kg/mm 3 ) Young modulus (MPa) Poisson ratio 5A06 2.7e-9 71000 0.33 5083 2.72e-9 71016 0.33 5183 2.66e-9 70327 0.33 Table 7: Material properties. Figure 5 : Finite element model of 5A06+5083 T-joint. Figure 6 : Finite element model of 5A06+5A06 T-joint. Figure 7 : Loading position of 5A06+5083 T-joint. Structural stress computation ABAQUS software is used to simulate the 5A06+5083 T-joint and the 5A06+5A06 T-joint so that the nodal force at weld toe is computed. The detailed calculation process of structural stress and equivalent structural stress could be found in reference [1,2]. For example, the nodal force computation result of 5A06+5083 T-joint when 70 max MPa  = and the nodal force computation result of 5A06+5083 T-joint when 80 max MPa  = are shown as in Fig. 8 and Fig. 9. The thickness of the 5A06+5083 T-joint shown as a in Fig. 3 is 8.6 mm and it is 14.9 mm for the 5A06+5A06 T- joint.