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.
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