13th International Conference on Fracture June 16–21, 2013, Beijing, China -2- fracture behavior of a number of materials. Some typical traction-separation laws are shown in the following. The linear decreasing traction-separation law shown in Fig. 1(a) was introduced by Hillerborg [16] to describe the brittle fracture behavior of a concrete beam. The polynomial and the exponential traction-separation laws shown in Fig. 1(b-c) were provided by Needleman [17, 18] to describe the decohesion behavior. Tvergaard and Hutchinson [19] invented a trapezoid shape to study the ductile fracture of solid, this traction-separation law was later modified by Scheider [20] for the investigation of a laser welded joint. In this paper, the cohesive zone model is adopted to study fracture of S355 EBW joints. 0 Τ δ 0 δ Γ 0 b) Τ0 0 Τ δ 0 δ Γ 0 c) Τ0 0 Τ 0 δ δ 0 δ 1 Γ 0 d) Τ δ 2 0 Τ 0 δ δ 0 δ 1 Γ 0 e) Τ δ 2 Fig. 1: Shape of traction separation laws: a) from Hillerborg [16], b)+c) from Needleman [17, 18], d) from Tvergaard and Hutchinson [19] and e) from Scheider [20] where T0 is cohesive strength, δ0 is critical separation and Γ0 is cohesive energy. 0 Τ δ a) Γ 0 Τ 0 δ 0
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