It has been shown experimentally that under mixed tensile and compressive stress states, a corresponding mixed-mode fracture will occur. In this paper, the formation of mixed-mode fractures is investigated using the combined finite–discrete element method. A series of simulations with confining pressures ranging from 7.5 to 150 MPa generate a spectrum of mixed-mode failure conditions. These stress states at failure span the transition from the tensile to compressive failure. The models reproduce previous experiments on Carrara marble using a dog-bone geometry, and a comparison shows good qualitative agreement with the experimental observations. This paper demonstrates that mixed-mode fracture can be captured via numerical simulations and identifies areas where further research is required to better understand mixed-mode fracture processes.

实验表明，在拉伸和压缩应力混合状态下，将发生相应的混合模式断裂。在本文中，使用组合有限元法研究了混合模式裂缝的形成。围压范围从7.5到150 MPa的一系列模拟生成了一系列混合模式故障条件。这些破坏时的应力状态涵盖了从拉伸破坏到压缩破坏的过渡。这些模型使用狗骨头的几何形状复制了先前在卡拉拉大理石上进行的实验，并且比较结果显示出与实验观察的良好定性一致性。本文证明了可以通过数值模拟捕获混合模式裂缝，并确定了需要进一步研究以更好地理解混合模式裂缝过程的领域。