Abstract A model of a SiC ceramic containing a single pre-existing flaw was established based on the discrete element method. The effects of the flaw inclination angles, which ranged from 0° to 75°, on the mechanical properties of the specimen under uniaxial compression were studied. The evolution of the force-chain field, displacement field and stress field around the pre-existing flaw in the process from the load to failure was also analysed. The results showed that the flaw inclination angle affected the mechanical properties of the specimen as well as the initiation and propagation of the first crack. Based on the investigation of the force chain field, it was found that the distribution curve of the normal force carried by the parallel bond in the specimen with the corresponding angles under compression is similar to the “peanut” rose diagram, while the shear force distribution curve is similar to the "butterfly wings" rose diagram. In addition, in the analysis of the displacement field and the stress field, the displacement field around the flaw can be divided into four types in the process from specimen loading to its failure. Meanwhile, it was found that initiation of the first crack was affected by tensile stress. With the propagation of the first crack, the tensile stress concentration region at the flaw tip moved and dissipated correspondingly.

中文翻译：

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单轴压缩下含单个预存缺陷的 SiC 陶瓷的离散元模拟

摘要 基于离散元法建立了含单个预存缺陷的碳化硅陶瓷模型。研究了0°~75°的缺陷倾角对试件单轴压缩力学性能的影响。还分析了从加载到失效过程中预先存在的缺陷周围的力链场、位移场和应力场的演变。结果表明，缺陷倾角影响试件的力学性能以及第一裂纹的萌生和扩展。通过对力链场的考察，发现受压试样中相应角度的平行键所承载的法向力分布曲线类似于“花生”玫瑰图，而剪切力分布曲线类似于“蝴蝶翅膀”玫瑰图。此外，在位移场和应力场的分析中，从试样加载到破坏的过程中，缺陷周围的位移场可分为四种类型。同时，发现第一次裂纹的萌生受拉应力的影响。随着第一个裂纹的扩展，裂纹尖端的拉应力集中区相应地移动和消散。发现第一次裂纹的萌生受拉应力的影响。随着第一个裂纹的扩展，裂纹尖端的拉应力集中区相应地移动和消散。发现第一次裂纹的萌生受拉应力的影响。随着第一个裂纹的扩展，裂纹尖端的拉应力集中区相应地移动和消散。