Cracks with unstable paths will appear in the glass during quenching. For different quenching speeds and temperatures, there will be linear, oscillatory and bifurcated crack paths. In this work, the phase-field cohesive zone model (PF-CZM) is adopted as the prototype model to address the problem of crack path instabilities in a quenched glass plate. Substituting the temperature field model into the phase field model, the thermal-mechanical coupling fracture problem is solved. The model accurately predicts different crack patterns in the quenched glass under different thermal shock densities. The variation of the crack tip positions and the crack propagating velocity are obtained. Several typical crack morphologies are simulated and analyzed, including linear, sinusoidal, semicircular and bifurcated cracks. The thresholds for crack propagation morphological variations are distinguished. Comparison with experimental data shows the efficiency and accuracy of the used phase-field model applied to thermal shock problems.

玻璃在淬火过程中会出现路径不稳定的裂纹。对于不同的淬火速度和温度，会出现线性、振荡和分叉的裂纹路径。在这项工作中，采用相场内聚区模型（PF-CZM）作为原型模型来解决淬火玻璃板中的裂纹路径不稳定问题。将温度场模型代入相场模型，解决了热力耦合断裂问题。该模型准确预测了不同热冲击密度下淬火玻璃中的不同裂纹模式。获得裂纹尖端位置的变化和裂纹扩展速度。对几种典型的裂纹形貌进行了模拟和分析，包括线性裂纹、正弦裂纹、半圆形裂纹和分叉裂纹。裂纹扩展形态变化的阈值是不同的。与实验数据的比较显示了所用相场模型应用于热冲击问题的效率和准确性。