| WU Jinbo,SUN Qi,JIANG Xiaoyu.Mechanical Behavior of Coating Cracks Based on Distributed Dislocation Method[J],53(7):171-179 |
| Mechanical Behavior of Coating Cracks Based on Distributed Dislocation Method |
| Received:April 11, 2023 Revised:August 10, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.07.018 |
| KeyWord:coating crack distributed dislocation stress intensity factor interfacial stress propagation direction |
| Author | Institution |
| WU Jinbo |
School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu , China |
| SUN Qi |
School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu , China |
| JIANG Xiaoyu |
School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| In the preparation of coating materials, defects such as pores and microcracks are often produced in the coating and the interface, and the propagation of cracks in the coating is a way of coating failure. In this paper, the mechanical properties and interaction of surface cracks and inner cracks in elastic coatings under uniaxial tensile load are solved theoretically. The method is also suitable for multiple cracks. According to the superposition principle, the problem becomes two sub-problems. The distributed dislocation principle was adopted for the crack problem. After superposition, the integral equation was solved by numerical solution method, and the dislocation density function was solved. The stress intensity factor (SIF) at the crack tip was calculated by interpolation method, and the propagation direction of the crack was calculated by maximum circumferential stress theory. The stress field of the model was obtained by substituting the dislocation density function back into the integral equation under global coordinates. The method was verified by setting the same modulus of the coating and the substrate and degrading the model to an infinite semi-planar sub-surface crack problem. |
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