Fracture performance assessment of Q690 steel and its butt welded joint based on GTN damage model

Jiangchao WANG; Zichao ZHUO

doi:10.19693/j.issn.1673-3185.02237

Volume 17 Issue 2

Apr. 2022

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Article Navigation > Chinese Journal of Ship Research > 2022 > 17(2): 142-147

WANG J C, ZHUO Z C. Fracture performance assessment of Q690 steel and its butt welded joint based on GTN damage model[J]. Chinese Journal of Ship Research, 2022, 17(2): 142–147 doi: 10.19693/j.issn.1673-3185.02237

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Fracture performance assessment of Q690 steel and its butt welded joint based on GTN damage model

doi: 10.19693/j.issn.1673-3185.02237

Jiangchao WANG^,,
Zichao ZHUO

School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Received Date: 2020-12-23
Rev Recd Date: 2021-04-11

Available Online: 2022-03-28

Publish Date: 2022-04-20

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 Q690 high strength steel (HSS) is usually employed in the fabrication of special parts for semi-submersible lifting and dismantling platforms. As such, the fracture strength assessment of its welded joints is essential to an investigation of the fracture mechanics behavior and service life of offshore structures. Methods First, the base material and butt-welding joints of Q690 HSS are taken as the research objects and subjected to uniaxial tension tests to obtain the corresponding stress-strain curves. Next, based on the GTN damage model, the tensile fracture curve equations of Q690 HSS and its butt-welded joints are established, while the corresponding calculation parameters of the GTN model are obtained through the exhaustive and particle swarm methods. Results The results show that the optimized values of the GTN model parameters can generally evaluate the fracture performance of Q690 HSS and its butt-welded joints, while a heuristic search algorithm based on the particle swarm method can effectively improve search efficiency with sufficiently accurate GTN model parameters. Conclusion Welding induced micro-defects and residual stress are eventually proposed to illustrate the difference in fracture performance between Q690 HSS and its butt-welded joints, which also influences the variation tendency of the GTN model parameters.
- high-strength steel (HSS),
- welding specification,
- stress-strain curve,
- GTN model,
- welded joint,
- fracture performance

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References

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