13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- specimens from the BM well. This shows, both, exponential and trapezoid shaped traction- separation laws are able to predict the crack propagation in BM specimens. The cohesive model can also predict FCOD curves of C(T)-FZ specimens before the sudden rupture. When choosing the exponential traction-separation law, the cohesive model can predict good FCOD and JR curve for the C(T)-HAZ specimens. All in all, the investigations of the fracture behavior of S355 EBW joints with the cohesive model confirm that the cohesive model is able to predict the crack propagation of the homogenous BM and the inhomogeneous welded joints well. Acknowledgements The research has been financially supported by China Scholarship Council (CSC) and SFB 716. This financial support is gratefully acknowledged. The authors would like to thank Prof. V. Ploshikhin and Dr. Y. Rudnik from Neue Materialien Bayreuth GmbH, for providing some of the experimental results. Reference [1] A. L. Gurson. Continuum theory of ductile rupture by void nucleation and growth: Part I-Yield criteria and flow rules for porous ductile media. J Eng Mater Techno-Trans. ASME 99 (1977), pp. 2-15. [2] V. Tvergaard. Influence of void nucleation on ductile shear fracture at a free surface. J Mech Phys Solids 30 (1982), pp. 399-425. [3] V. Tvergaard, A. Needleman. Analysis of the cup-cone fracture in a round tensile bar. Acta Metall 32 (1984), pp. 157-169. [4] A. Needleman, V. Tvergaard. A micromechanical analysis of ductile-brittle transition at a weld. Engng Frac Mech 62 (1999), pp. 317-338. [5] V. Tvergaard, A. Needleman. Analysis of the Charpy V-notch test for welds. Engng Frac Mech 65 (2000), pp. 627-643. [6] V. Tvergaard, A. Needleman. 3D analyses of the effect of weld orientation in Charpy specimens. Engng Frac Mech 71 (2004), pp. 2179-2195. [7] P. Nègre, D. Steglich, W. Brocks. Crack extension in aluminium welds: a numerical approach using the Gurson-Tvergaard-Needleman model. Engng Fract Mech 71 (2004), pp. 2365-2383. [8] P. Nègre et al.. Numerical simulation of crack extension in aluminium welds. Comp Mater Sci 28 (2003), pp. 723-731. [9] A. Nonn, W. Dahl, W. Bleck. Numerical modelling of damage behaviour of laser-hybrid welds. Engng Fract Mech 75 (2008), pp. 3251-3263. [10] G. Rousselier. Ductile fracture models and their potential in local approach of fracture. Nucl Eng Design 105 (1987), pp. 97-111. [11] H. Y. Tu, S. Schmauder, U. Weber, Y. Rudnik, V. Ploshikhin. Numerical simulation and experimental investigation of the damage behavior on electron beam welded joints. Proc Engng 10 (2011), pp. 875-880. [12]H. Y. Tu, S. Schmauder, U. Weber, Y. Rudnik, V. Ploshikhin. Simulation of the damage behavior of electron beam welded joints with the Rousselier model. Engng Fract Mech (2012),
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