Fracture-permeability behavior of shale JW Carey, Z Lei, E Rougier, H Mori, H Viswanathan Journal of unconventional oil and gas resources 11, 27-43, 2015 | 108 | 2015 |

Investigation of impact fracture behavior of automobile laminated glass by 3D discrete element method MY Zang, Z Lei, SF Wang Computational Mechanics 41 (1), 73-83, 2007 | 94 | 2007 |

Understanding hydraulic fracturing: a multi-scale problem JD Hyman, J Jiménez-Martínez, HS Viswanathan, JW Carey, ML Porter, ... Philosophical Transactions of the Royal Society A: Mathematical, Physical …, 2016 | 83 | 2016 |

An approach to combining 3D discrete and finite element methods based on penalty function method Z Lei, M Zang Computational Mechanics 46 (4), 609-619, 2010 | 65 | 2010 |

A contact algorithm for 3D discrete and finite element contact problems based on penalty function method M Zang, W Gao, Z Lei Computational Mechanics 48 (5), 541-550, 2011 | 63 | 2011 |

High‐stress triaxial direct‐shear fracturing of Utica shale and in situ X‐ray microtomography with permeability measurement LP Frash, JW Carey, Z Lei, E Rougier, T Ickes, HS Viswanathan Journal of Geophysical Research: Solid Earth 121 (7), 5493-5508, 2016 | 52 | 2016 |

Earthquake damage patterns resolve complex rupture processes Y Klinger, K Okubo, A Vallage, J Champenois, A Delorme, E Rougier, ... Geophysical Research Letters 45 (19), 10,279-10,287, 2018 | 47 | 2018 |

Fracture and fragmentation of thin shells using the combined finite–discrete element method A Munjiza, Z Lei, V Divic, B Peros International journal for numerical methods in engineering 95 (6), 478-498, 2013 | 46 | 2013 |

A framework for grand scale parallelization of the combined finite discrete element method in 2d Z Lei, E Rougier, EE Knight, A Munjiza Computational Particle Mechanics 1 (3), 307-319, 2014 | 43 | 2014 |

Dynamics, radiation, and overall energy budget of earthquake rupture with coseismic off‐fault damage K Okubo, HS Bhat, E Rougier, S Marty, A Schubnel, Z Lei, EE Knight, ... Journal of Geophysical Research: Solid Earth 124 (11), 11771-11801, 2019 | 36 | 2019 |

A generalized anisotropic deformation formulation for geomaterials Z Lei, E Rougier, EE Knight, A Munjiza, H Viswanathan Computational Particle Mechanics 3 (2), 215-228, 2016 | 35 | 2016 |

Modeling of stick‐slip behavior in sheared granular fault gouge using the combined finite‐discrete element method K Gao, BJ Euser, E Rougier, RA Guyer, Z Lei, EE Knight, J Carmeliet, ... Journal of Geophysical Research: Solid Earth 123 (7), 5774-5792, 2018 | 30 | 2018 |

Simulation of fracture coalescence in granite via the combined finite–discrete element method B Euser, E Rougier, Z Lei, EE Knight, LP Frash, JW Carey, H Viswanathan, ... Rock Mechanics and Rock Engineering 52 (9), 3213-3227, 2019 | 28 | 2019 |

Hybrid optimization software suite (HOSS)-educational version EE Knight, E Rougier, Z Lei Technical Report LA-UR-15-27013, Los Alamos National Laboratory, 2015 | 25 | 2015 |

LC-Grid: a linear global contact search algorithm for finite element analysis H Chen, Z Lei, M Zang Computational Mechanics 54 (5), 1285-1301, 2014 | 23 | 2014 |

Experimental investigation of fracturing of shale with water JW Carey, E Rougier, Z Lei, H Viswanathan 49th US Rock Mechanics/Geomechanics Symposium, 2015 | 17 | 2015 |

Simulation of discrete cracks driven by nearly incompressible fluid via 2D combined finite‐discrete element method Z Lei, E Rougier, A Munjiza, H Viswanathan, EE Knight International Journal for Numerical and Analytical Methods in Geomechanics …, 2019 | 16 | 2019 |

A non-locking composite tetrahedron element for the combined finite discrete element method Z Lei, E Rougier, EE Knight, L Frash, JW Carey, H Viswanathan Engineering Computations, 2016 | 16 | 2016 |

Simulation of crack induced nonlinear elasticity using the combined finite-discrete element method K Gao, E Rougier, RA Guyer, Z Lei, PA Johnson Ultrasonics 98, 51-61, 2019 | 14 | 2019 |

HOSS: An integrated platform for discontinua simulations A Munjiza, E Rougier, EE Knight, Z Lei Frontiers of discontinuous numerical methods and practical simulations in …, 2013 | 14 | 2013 |