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J. Korean Ceram. Soc. > Volume 61(2); 2024 > Article
Journal of the Korean Ceramic Society 2024;61(2): 286-297.
doi: https://doi.org/10.1007/s43207-023-00339-9
Interface debonding by growth of interface defect ahead of main crack approaching with oblique paths in layered systems
Woong Lee
Department of Materials Convergence and System Engineering, School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon-si, Gyeongsangnam-do, 51140, Republic of Korea
Correspondence  Woong Lee ,Email: woonglee@changwon.ac.kr
Received: August 28, 2023; Revised: October 3, 2023   Accepted: October 29, 2023.  Published online: February 20, 2024.
Deflection of a crack at interfaces in laminated systems was considered for the case where a main crack terminates ahead of an interface defect with obliquity under mixed mode loading, assuming the interaction between the main crack and the interface defect occurs within the stress-dominant field of the main crack. Stress intensity factors at the tips of the interface defect were calculated numerically by a weight function method for various combinations of obliquity and mode mixity of the main crack, applying Buckner’s superposition principle. It was predicted that the crack driving forces in terms of the stress intensity factors at these two tips develop in asymmetric manner and therefore crack would be deflected singly by the growth of debond crack from only one side of the defect. The energetic conditions for single crack deflection become more favorable with increasing obliquity if the main crack is in opening mode, but less favorable when increased obliquity is in combination with shear-dominant mixed mode loading. It is desirable that engineering structures or components employing layered systems be in conditions where the main crack approaches the interface with small or zero oblique angle, and it is under an opening mode loading.
Key words: Crack deflection · Laminated systems · Interface · Mixed mode fracture
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