期刊
ENGINEERING FRACTURE MECHANICS
卷 276, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2022.108920
关键词
Mode-adjustable; Phase-field model; Crack driving energy; Weight parameter; Mixed-mode fracture
类别
资金
- National Natural Science Foundation of China (NSFC)
- Open Projects of State Key Laboratory for Strength and Vibration of Mechanical Structures (Xi?an Jiaotong University)
- Heilongjiang Touyan Innovation Team Program
- [12172103]
- [11972134]
- [12020101001]
- [12002106]
- [SV2021-KF-07]
A mode-adjustable phase-field model is proposed to regulate the relative contribution of crack driving energy and change the cracking mode. The model shows better simulations than the classical phase-field model in fracture experiments for polymethylmethacrylate and Al 7075-T651 aluminum. Simulating a shear test, it is found that the weight parameter affects the failure pattern during crack propagation, while the initial crack deflection angle remains unchanged in a specific spectral decomposition split method.
A mode-adjustable phase-field model is proposed by introducing a weight parameter to regulate the relative contribution of the volumetric and distortional crack driving energy. Altering the weight parameter results in the change of cracking mode. The weight parameter can be considered as a material parameter and determined through the comparison of experimental and simulated results. The proposed phase-field model is employed to simulate the fracture experiments for polymethylmethacrylate and Al 7075-T651 aluminum. Applying the experimentally determined parameter, the mode-adjustable phase-field model provides better simulations than the classical phase-field model for both materials. Afterwards, a shear test of a single edge notched plate is simulated and the results show that for the volumetric-deviatoric split method, as the weight parameter increases, the failure pattern during crack propagation exhibits a transition from the mode-I dominant failure to the mode-II dominant failure gradually. On the contrary, a mode-I dominant cracking always occurs with the initial crack deflection angle of about 70.5 degrees, regardless of the value of weight parameter for the spectral decomposition split method. To summarize, the proposed mode-adjustable phase-field model can reflect the difference of crack driving mechanism, which is helpful for capturing and understanding the fracture characteristics of diverse materials.
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