Volume 17 Issue 2
Apr.  2022
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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
Citation: 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

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

doi: 10.19693/j.issn.1673-3185.02237
  • Received Date: 2020-12-23
  • Rev Recd Date: 2021-04-11
  • Available Online: 2022-03-28
  • Publish Date: 2022-04-20
    © 2022 The Authors. Published by Editorial Office of Chinese Journal of Ship Research. Creative Commons License
    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.
  •   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.
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