Application of improved cohesive zone length formula in ice mode I crack propagation

NI Baoyu; XU Ying; HUANG Qi; YOU Jia; XUE Yanzhuo

doi:10.19693/j.issn.1673-3185.02701

Volume 17 Issue 3

Jun. 2022

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Article Navigation > Chinese Journal of Ship Research > 2022 > 17(3): 58-66

NI B Y, XU Y, HUANG Q, et al. Application of improved cohesive zone length formula in ice mode I crack propagation[J]. Chinese Journal of Ship Research, 2022, 17(3): 58–66 doi: 10.19693/j.issn.1673-3185.02701

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Application of improved cohesive zone length formula in ice mode I crack propagation

doi: 10.19693/j.issn.1673-3185.02701

NI Baoyu^{1
,
,},
XU Ying²,
HUANG Qi^3
,,
YOU Jia^1
,,
XUE Yanzhuo^1
,

1.
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
2.
Marine Design and Research Institute of China, Shanghai 200011, China
3.
Jiangsu Branch of China Classification Society, Nanjing 210011, China

Received Date: 2021-12-14
Rev Recd Date: 2022-04-07

Available Online: 2022-05-24

Publish Date: 2022-06-30

Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objectives The cohesive zone length is the sum of the cohesive element length at the failure edge and the lengths of the other cohesive elements connected to it. The cohesive zone length determines the maximum size of the mesh. Therefore, the accurate estimation of cohesive zone length and reasonable mesh division are important factors affecting calculation accuracy. Methods Based on several J-integral assumptions and existing research results, a modified function on length thickness ratio value is added to the original formula. The modified formula is then applied to an ice mechanics model. Based on the finite element method, a model of a double cantilever beam is established to verify the accuracy of the formula through comparison with the experimental results. Results The results show that there must be at least four cohesive elements in a cohesive zone length to describe the fracture process accurately. This conclusion is also applied to the numerical simulation of a three-point bending experiment. The error of the limit load is 2.9%, and that of the fracture point is within a reasonable range. Conclusion It is concluded that the modified cohesive zone length formula is more suitable for ice materials.
- ice mechanics,
- cohesive element method (CEM),
- cohesive zone length,
- mesh division,
- three-point bending experiment

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