祝贺喻渴来的论文《A mesoscale modelling approach coupling SBFEM, continuous damage phase-field model and discrete cohesive crack model for concrete fracture》被期刊EFM接受发表！

论文链接：https://doi.org/10.1016/j.engfracmech.2022.109030

A mesoscale modelling approach coupling SBFEM, continuous damage phase-field model and discrete cohesive crack model for concrete fracture

Kelai Yu, Zhenjun Yang^*, Hui Li, Ean Tat Ooi, Shangming Li^*, GuoHua Liu

This study develops an innovative numerical approach for simulating complex mesoscale fracture in concrete. This new approach thus takes full advantages of different methods, including the semi-analytical accuracy and high flexibility in mesh generation and transition of SBFEM, the mesh and length-scale independence of PF-CZM, and the ease-of-use of CIEs in modelling discrete interfacial fracture. Using one SBFEM polygon or polyhedron to model one aggregate without internal nodal discretization saves considerable DOFs compared with pure finite element models. The mortar material is simulated by finite elements with the mesh and length-scale independent continuous PF-CZM as the constitutive law, so that no remeshing or pre-insertion of cohesive elements are needed to accommodate complicated crack propagation in the mortar; The develop approach is thus capable of simulating both continuous damage evolution and discrete crack propagation, but with damage in the mortar and interfaces calculated separately to elucidate failure mechanisms clearly.

本研究提出了一种新颖的数值方法用于模拟混凝土复杂细观断裂过程。该方法充分利用了比例边界有限元发(SBFEM)的半解析精度和在网格生成和过渡方便的灵活，统一相场模型(PF-CZM)在损伤断裂模拟中的低网格敏感性以及粘结单元模拟离散界面开裂的便捷性等优势。模拟结果表明，使用单个SBFEM多边形或多面体单元模拟单颗骨料，相比传统有限元方法，可显著减少模型自由度数量。采用PF-CZM模型可有效模拟砂浆的复杂开裂过程，同时避免了网格重画分以及网格依赖性。所提出的方法具有同时模拟连续损伤和离散裂缝扩展的能力，通过单独分析砂浆和界面失效过程可有效探究其各自失效机理。

Fig. 1. The concept of the developed modelling approach

Fig. 2. A 2D mesh for the three-point bending beam (Model-1).

Fig. 3. Damage evolution in the mortar for the 2D mode-I fracture beam (Model-1).

Fig. 4. A 3D mesh for the Type-I beam (Model-1).

Fig. 5. Damage evolution in the mortar of 3D model for the Type-I beam (scale factor: 50.0).

Acknowledgements：This study is funded by National Natural Science Foundation of China (No. 51974202, No. 52173300 and No. 51979244), Sino-German Center for Research Promotion (Mobility Programme No. M-0172), and Key Research and Development Programme of Hubei Province (No. 2020BAB052).