"MPF_FEM" is developed to facilitates the application of the phase-field method in multiscale and multiphysics geological conditions. 
This code is the first stage project to implement the micromechanics-based phase-field (MPF) model.

This MPF model is of several features, e.g., a new degradation function for the plastic free energy,
two distinct constitutive models for modeling tension-brittle fracture and compressive-shear failure, damage-plasticity coupling and line search technique.

The user please cite the following papers:
1. You, T., Waisman, H., & Zhu, Q. Z. (2020). Brittle-ductile failure transition in geomaterials
modeled by a modified phase-field method with a varying damage-driving energy coefficient.
International Journal of Plasticity, 136, 102836. https://doi.org/10.1016/j.ijplas.2020.102836
2.You, T., Waisman, H., Chen, W. Z., Shao, J. F. & Zhu Q. Z. (2021) A novel micromechanics-enhanced phase-field model for frictional damage and
fracture of quasi-brittle geomaterials. Computer Methods in Applied Mechanics and Engineering. 385, 114060. https://doi.org/10.1016/j.cma.2021.114060