Abstract
The phase field method is a very effective method to simulate arbitrary crack propagation, branching, convergence and complex crack networks. However, most of the current phase-field models mainly focus on tensile fracture problems, which is not suitable for rock-like materials subjected to compression and shear loads. In this paper, we derive the driving force of phase field evolution based on Mohr–Coulomb criterion for rock and other materials with shear frictional characteristics and develop a three-dimensional explicit parallel phase field model. In spatial integration, the standard finite element method is used to discretize the displacement field and the phase field. For the time update, the explicit central difference scheme and the forward difference scheme are used to discretize the displacement field and the phase field respectively. These time integration methods are implemented in parallel, which can tackle the problem of the low computational efficiency of the phase field method to a certain extent. Then, three typical benchmark examples of dynamic crack propagation and branching are given to verify the correctness and efficiency of the explicit phase field model. At last, the failure processes of rock-like materials under quasi-static compression load are studied. The simulation results can well capture the compression-shear failure mode of rock-like materials.
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Acknowledgements
This work is supported by National Natural Science Foundation of China, under Grant No. 11532008, the Special Research Grant for Doctor Discipline by Ministry of Education, China under Grant No. 20120002110075.
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Appendix A Performance study
Appendix A Performance study
The phase-field method usually requires large-scale computation, and parallel computing is particularly important at this time. Explicit time integration scheme is very suitable for parallel computation. We use multi-CPU subregional computing to implement parallel computing. Here we take the example in Sect. 5.2 to study the efficiency of the parallel computing. To carry out parallel computation, we divide the whole model according to the number of CPUs used. Figure 27 gives the results of domain division of the model when using 8 CPUs and 12 CPUs, and then calculates each region with one CPU. The information on the common boundary of each domain is stored in the public variables, which are synchronized in multiple cpus via MPI function.
The wall time of the model with different number of CPUs is shown in Fig. 28a. The model has 7939500 DOFs and 53244 incremental steps. We can find that using multiple CPUs can greatly improve the efficiency of calculation, and the wall time is approximately inversely proportional to the number of CPUs used. Figure 28b shows the wall time consumed by the same model with the same number of CPUs (16) and different DOFs. It can be seen that the relationship between the wall time and the number of DOFs is basically linear, which is better than that of the implicit scheme.
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Wang, T., Ye, X., Liu, Z. et al. Modeling the dynamic and quasi-static compression-shear failure of brittle materials by explicit phase field method. Comput Mech 64, 1537–1556 (2019). https://doi.org/10.1007/s00466-019-01733-z
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DOI: https://doi.org/10.1007/s00466-019-01733-z