13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 200 400 600 800 1000 1200 1400 1600 1800 S355 BM--notched round specimen Engineering axial stress (MPa) ΔD (mm) test: eng. axial stress el-pl FEM: eng. axial stress el-pl FEM: axial stress in the centre T0=1180 MPa Fig. 4: Determination of the cohesive stress T0: comparison of axial stress versus the diameter reduction curve from FE simulation and the experiments and the maximum true axial stress in the center of the specimen. Fig. 5: Finite element mesh and boundary conditions of the C(T) specimen. Fig. 6: Detailed finite element mesh around the initial crack position. Initial crack point Cohesive element layer Initial crack length Symmetry plane Loading direction Loading point
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