An improved cellular automaton based on physical energy distribution for microcrack evolution analysis

2nd International Conference on Frontiers of Materials Synthesis and Processing

Zhao, Hengrui^1 ; Cheng, Guangxu^1

School of Chemical Engineering and Technology, Xian Jiaotong University, Xian, China^1

关键词: Cellular Automata method;    Energy competition;    Energy distributions;    Evolution analysis;    Failure thresholds;    Reliability Evaluation;    Sensitivity parameters;    Voronoi algorithm;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/493/1/012152/pdf
DOI  :  10.1088/1757-899X/493/1/012152

来源: IOP

【 摘 要 】

Microcracks are important factor in the early stage of structural material failure. The cellular automata method was improved in this paper to simulate microcracks evolution process for material failure analysis. Basic rules based on generalized energy were defined including cells status, failure thresholds and energy input. The Voronoi algorithm was used to construct a random grid to simulate the influence of grain boundaries. Combining overall and local stress status, a sensitivity parameter was introduced to decide the energy distribution, and the new energy distribution rule could accurately reflect the energy competition mechanism between microcracks. Numerical results are in reasonable agreement with experimental results in related literature. The relation between input energy and cracks numerical density could be used in reliability evaluation.