Applied Mathematics and Mechanics (English Edition) ›› 2023, Vol. 44 ›› Issue (12): 2093-2108.doi: https://doi.org/10.1007/s10483-023-3061-7

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Fracture of films caused by uniaxial tensions: a numerical model

Chenxue JIA1,2, Zihao WANG3, Donghui ZHANG3, Taihua ZHANG3, Xianhong MENG4   

  1. 1. School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China;
    2. Key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094, China;
    3. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China;
    4. School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
  • Received:2023-08-26 Revised:2023-10-03 Published:2023-11-27
  • Contact: Xianhong MENG, E-mail: mxh@buaa.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (Nos. 12172027 and 11572022)

Abstract: Surface cracks are commonly observed in coatings and films. When structures with coatings are subject to stretching, opening mode cracks are likely to form on the surface, which may further lead to other forms of damage, such as interfacial delamination and substrate damage. Possible crack forms include cracks extending towards the interface and channeling across the film. In this paper, a two-dimensional numerical model is proposed to obtain the structural strain energy at arbitrary crack lengths for bilayer structures under uniaxial tension. The energy release rate and structural stress intensity factors can be obtained accordingly, and the effects of geometry and material features on fracture characteristics are investigated, with most crack patterns being confirmed as unstable. The proposed model can also facilitate the analysis of the stress distribution in periodic crack patterns of films. The results from the numerical model are compared with those obtained by the finite element method (FEM), and the accuracy of the theoretical results is demonstrated.

Key words: surface crack, numerical model, stress intensity factor, periodic crack, finite element method (FEM)

2010 MSC Number: 

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