13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- Table 2 : Young's modulus, Poisson's ratio and visco-plastic coefficients for 16MND5 steel Figure 2 : Tensile curves at different temperature for 16MND5 steel. Open symbols correspond to the experimental data, solid lines to the modeling. Inset: Applied force vs. diameter reduction for AE notched specimens (notch radius 0.6mm, initial diameter φ0=6mm). All the mechanical tests correspond to a strain rate of ε = 5.10-4s-1. All the analysis were performed using the finite element software Cast3m [10] using the elasto-visco-plastic constitutive equations described above. CT specimens are modeled with 2D plane strain, quadratic, full integration elements. Two different LAF models were used to predict the probabilities of cleavage fracture. The first one is the seminal Beremin model [11] modified to account for non-monotonic loadings [12]. The second is a simplified version of the model proposed by Bordet [6,13] which has the particularity to account explicitly for the necessity of active plasticity to trigger cleavage. The fracture probability for both models can be written as:
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