Simulation of crack patterns in quasi-brittle materials under thermal shock using phase field and cohesive zone models

• Published in: Engineering fracture mechanics Vol. 276; p. 108889
• Main Authors: Wang, Tao, Han, Haoyue, Wang, Yifan, Ye, Xuan, Huang, Guangyan, Liu, Zhanli, Zhuang, Zhuo
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2022
• Subjects: Ceramic quenching; Cohesive zone model; Crack patterns; Phase field model; Thermal shock; Phase field model; Crack patterns; Cohesive zone model; Ceramic quenching; Thermal shock
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2022.108889

•A phase field coupled cohesive zone model (PF-CZM) is proposed to simulate the complex crack patterns under thermal shock.•Inertial effects, convective heat transfer and transient heat conduction processes are considered in PF-CZM.•The fracture processes of 1D rods under uniaxial tension and cooling conditions are studied to verify the accuracy of PF-CZM.•The dominant role of the difference in thermal expansion coefficients between the matrix and glaze layers of ceramic bottles in the formation of complex cracking patterns is investigated. Complex crack patterns are usually formed on the surface of brittle and quasi-brittle solids under thermal shock. In this paper, the phase field coupled cohesive zone model is established to simulate the brittle and quasi-brittle fracture processes in three-dimensional solids, especially to reproduce the complex crack patterns under thermal shock. Several examples are given to illustrate the effectiveness of the model to complex fracture problems under thermal shock: from uniaxial tensile and thermal shrinkage fracture of a one-dimensional rod to nucleation, propagation, and crack pattern formation of thermal shock crack of a three-dimensional ceramic bottle. In addition, the formation mechanism of crack patterns in ceramic bottle is discussed, especially the dominant role of the difference in thermal expansion coefficients between the ceramic matrix layer and the glaze layer in the formation of crack patterns and the final crack density.