The modelling of crack propagation for elastic-plastic materials is critical in various engineering applications, such as safety analysis of concrete structures and stability analysis of rock slopes. Combined with elastic-plastic theory and fracture mechanics, the local radial basis point Interpolation method (LRPIM)has the ability to analyse crack propagation in elastic-plastic materials. Crack propagation in elastic-plastic materials is compared using the LRPIM and Extended Finite Element method (XFEM). The comparative investigation indicates that: (1) The LRPIM results are close to the model test results, which indicates that it is feasible for analysing crack growth of elastic-plastic materials. (2) Compared with the LRPIM, the XFEM results are closer to the experimental results, showing that the XFEM has higher accuracy and computational efficiency. (3) Compared with the XFEM, when the LRPIM method is used to analyse crack propagation, the propagation path is not smooth enough, which can be explained that the crack tip stress and strain not being accurate enough.

The submitted folder includes six data files, the files numbered 1 and 2 are the data files of figs. 6, 7 and 8, the files numbered 3 and 4 are the data files of figs. 9, 10 and 11, and the files numbered 5 and 6 are the data files of figs. 12, 13 and 14. The data files numbered 1, 3 and 5 are displacement and stress information of model field nodes. Data files numbered 2, 4 and 6 include information about fracture surfaces.