The engineered cementitious composite (ECC) cracking process involves discontinuities. To solve this difficulty, a semi-discrete model for ECC based on peridynamics (PD) is established. In this paper, the pairwise force function is modified by using an improved damage coefficient. This model is established by modeling the matrix and the interactions between the fiber and matrix. The interactions between the fiber and matrix are applied to the material point in the form of forces. A reasonable horizon size and grid spacing ratio are obtained by analyzing the convergence of the ECC plate’s crack propagation. The validity of the PD model in this paper is demonstrated by comparing the uniaxial tensile simulation results of ECC plates with the relevant experimental results. Finally, the effects of pre-crack position and fiber volume fraction on dynamic fracture under an impact load are studied. This work helps to predict the crack propagation path of ECC structures which is important to guide engineering practice.

工程胶结复合材料（ECC）的开裂过程涉及不连续性。为了解决这一难题，建立了基于周动力学（PD）的ECC半离散模型。在本文中，通过使用改进的损伤系数来修改成对的力函数。通过对基质以及纤维与基质之间的相互作用进行建模来建立该模型。纤维和基体之间的相互作用以力的形式应用于材料点。通过分析ECC板裂纹扩展的收敛性，可以获得合理的层级尺寸和网格间距比。通过将ECC板的单轴拉伸模拟结果与相关实验结果进行比较，证明了PD模型的有效性。最后，研究了裂纹前位置和纤维体积分数对冲击载荷下动态断裂的影响。这项工作有助于预测ECC结构的裂纹扩展路径，这对指导工程实践非常重要。