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Publishing Language: Chinese

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

Baoyu NI1( ), Ying XU2, Qi HUANG3, Jia YOU1, Yanzhuo XUE1
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
Marine Design and Research Institute of China, Shanghai 200011, China
Jiangsu Branch of China Classification Society, Nanjing 210011, China
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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.

Keywords

ice mechanicscohesive element method (CEM)cohesive zone lengthmesh divisionthree-point bending experiment
CLC number: U661.1 Document code: A

References

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Chinese Journal of Ship Research
Volume 17 Issue 3,
June 2022
Pages 58-66
DOI: 10.19693/j.issn.1673-3185.02701

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

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Received: 14 December 2021
Revised: 07 April 2022
Published: 24 May 2022
© 2022 Chinese Journal of Ship Research.