Effect of surface flaw on ductile fracture behavior of non-aligned multiple flaws in plate is studied numerically using Gurson’s constitutive equation. Based on experiments, two parallel non-aligned crack problems are simulated. From experimental and simulation data, crack coalescence, interaction between two cracks and crack penetration was observed. In all cases, ductile fracture processes are obtained and results are compared with experimental ones. Fracture patterns agree well with experimental results. Close qualitative match was obtained by comparing each load displacement curves that are normalized by maximum load. It shows that the mechanism of ductile fracture process is properly captured. By selecting one normalized experimental data as a base setup, maximum load from related simulation results can be predicted. Aligned rules are checked based on these simulations, and H / a criteria verified it’s availability when average crack depth is used as crack depth.

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