王江超, 卓子超. 基于GTN损伤模型的Q690钢及其对接接头断裂性能评估[J]. 中国舰船研究, 2022, 17(2): 142–147. doi: 10.19693/j.issn.1673-3185.02237
引用本文: 王江超, 卓子超. 基于GTN损伤模型的Q690钢及其对接接头断裂性能评估[J]. 中国舰船研究, 2022, 17(2): 142–147. doi: 10.19693/j.issn.1673-3185.02237
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

基于GTN损伤模型的Q690钢及其对接接头断裂性能评估

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

  • 摘要:
      目的  Q690高强度钢作为半潜式起重拆解平台的特殊部位用钢,评估其焊接接头的断裂强度,是研究平台结构断裂力学行为及运营寿命的基础。
      方法  首先,对Q690高强度钢及其对接接头进行轴向拉伸试验,获得对应的应力−应变曲线;然后,基于GTN模型,构建Q690高强度钢及其焊接接头的拉伸断裂曲线方程,其中GTN损伤模型的计算参数通过穷举法及粒子群法获得。
      结果  结果显示,优化的GTN损伤模型计算参数可以较为精确地评估Q690高强度钢及其焊接接头的断裂性能;基于粒子群的启发式搜索算法在保证精度的同时能有效提升计算效率。
      结论  焊接产生的微观缺陷及残余应力可以用于阐述Q690高强度钢断裂性能与其对接接头断裂性能的区别,将影响到GTN模型参数的变化趋势。

     

    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.

     

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