Abstract The influence of a prefabricated crack on thermal-shock cracking during quenching is studied in real-time. The results show that after the thermal-shock crack extends to the prefabricated crack, the secondary crack may appear at the lower end of the prefabricated crack. The total vertical length of the crack and the probability of the secondary crack occurrence will gradually increase with the prefabricated crack angle. Besides, the influence of the prefabricated crack distance from the edge on thermal-shock crack growth is also considered. The simulation results of meso-damage mechanics are consistent with experimental observation. This article quantitatively investigates the effect of the prefabricated crack on the thermal-shock crack propagation in ceramics, expanding the research on the mechanism of thermal-shock failure.

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预制裂纹对淬火陶瓷裂纹扩展的影响

摘要 实时研究了预制裂纹对淬火热震裂纹的影响。结果表明，热冲击裂纹扩展到预制裂纹后，预制裂纹下端可能出现二次裂纹。随着预制裂纹角度的增加，裂纹的总垂直长度和二次裂纹发生的概率会逐渐增大。此外，还考虑了预制裂纹距边缘的距离对热冲击裂纹扩展的影响。细观损伤力学模拟结果与实验观察一致。本文定量研究了预制裂纹对陶瓷热震裂纹扩展的影响，拓展了热震破坏机理的研究。