Phase field modelling of elastic-plastic fatigue fracture of oil and gas pipeline

IF 1.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Zhen Wang, Wei He, Xin Li, Tao Lu, Shengguo Chen, Dingyu Li and Hengwei Zheng
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Abstract

This paper established a fatigue fracture phase-field model (PFM) to evaluate fatigue damage evolution and crack propagation in oil and gas pipeline. To address inaccuracies in damage evolution, a threshold of the elastic-plastic fracture energy was introduced in the proposed PFM. Using the finite element method, the PFM was applied to simulate fatigue crack growth. Results from compact tension (CT) specimen of the X56 gas pipeline steel demonstrated that the da/dN-ΔK curve from the current PFM, accounting for plasticity, aligned more closely with experimental results than the elastic PFM. The fatigue crack propagation and fatigue life of the X80 gas pipeline with different defects of the same depth were also analyzed. The results indicated that triangular defects significantly impacted the fatigue life of the X80 gas pipeline. Finally, a model of X60 pipeline with various initial defects was developed to validate the effectiveness of the proposed PFM for full-scale pipeline fatigue fracture by comparing it to experimental a-N curves. The simulation results indicated that the distance and angle between two initial defects in the pipeline significantly influenced the propagation of fatigue cracks and the pipeline’s service life. These findings of this paper can serve as a reference for estimating the service life of gas and oil pipelines.
油气管道弹塑性疲劳断裂的相场建模
本文建立了疲劳断裂相场模型(PFM),用于评估油气管道的疲劳损伤演化和裂纹扩展。为了解决损伤演化过程中的不准确性,在所提出的 PFM 中引入了弹塑性断裂能量阈值。利用有限元方法,PFM 被用于模拟疲劳裂纹的生长。X56 煤气管道钢紧凑拉伸 (CT) 试样的结果表明,考虑到塑性,当前 PFM 得出的 da/dN-ΔK 曲线比弹性 PFM 更接近实验结果。此外,还分析了具有相同深度的不同缺陷的 X80 输气管道的疲劳裂纹扩展和疲劳寿命。结果表明,三角形缺陷严重影响了 X80 输气管道的疲劳寿命。最后,建立了具有各种初始缺陷的 X60 输气管道模型,通过与实验 a-N 曲线进行比较,验证了所提出的 PFM 对全尺寸管道疲劳断裂的有效性。模拟结果表明,管道中两个初始缺陷之间的距离和角度极大地影响了疲劳裂纹的扩展和管道的使用寿命。本文的研究结果可作为估算天然气和石油管道使用寿命的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials Research Express
Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
4.50
自引率
4.30%
发文量
640
审稿时长
12 weeks
期刊介绍: A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.
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