基于XFEM的含裂纹输氢管道疲劳断裂研究

Research on fatigue fracture of hydrogen pipeline with cracks based on XFEM

摘要

氢能是未来国家能源体系的重要组成部分,对“双碳”目标的实现具有支撑作用。管道输氢被认为是实现低成本、大规模输氢的最佳方式,然而在氢脆作用下输氢管道更容易发生疲劳失效。针对目前输氢管道疲劳裂纹扩展机制尚不明晰,裂纹扩展过程模拟困难且计算成本高的问题,基于断裂力学理论推导出基于能量释放率的Paris公式,采用扩展有限元法(XFEM)研究含裂纹输氢管道的疲劳失效模式,并对影响输氢管道疲劳寿命的因素进行分析。结果表明:输氢管道的疲劳失效行为由裂纹深度控制,而非能量释放率控制;输氢管道疲劳寿命随氢气压力增大和应力比减小而降低;初始裂纹尺寸也会影响输氢管道的疲劳寿命,其中裂纹深度变化对输氢管道疲劳寿命的影响更为显著。

Abstract

Hydrogen energy is a crucial component of the future national energy system and plays a supporting role in the realization of the carbon peaking and carbon neutrality goals. Pipeline transportation is considered as the best way to achieve low-cost and large-scale transportation. However, under the effect of hydrogen embrittlement, hydrogen pipeline is more prone to fatigue failure. In response to the current uncertainty regarding the mechanism of fatigue crack propagation in hydrogen pipelines, and the challenges associated with simulating the process and the high computational costs involved, this study derived the Paris formula based on energy release rate using fracture mechanics theory. The extended finite element method (XFEM) was then employed to investigate the fatigue failure mode of hydrogen pipeline with cracks, and an analysis of factors influencing the fatigue life of hydrogen pipeline was conducted. The results show that the fatigue failure behavior of hydrogen pipeline is controlled by the crack depth rather than the energy release rate. The fatigue life of hydrogen pipeline decreases with the increase of hydrogen pressure and the decrease of stress ratio. The initial crack size also affects the fatigue life of hydrogen pipeline, with the variation in crack depth having a more significant impact on the fatigue life of the pipeline.

关键词

输氢管道 / 扩展有限元 / 氢脆 / 裂纹扩展 / 疲劳 / 失效模式 / 数值模拟

Key words

hydrogen pipeline / extended finite element method / hydrogen embrittlement / crack growth / fatigue / failure mode / numerical simulation

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基金资助

国家自然科学基金项目(52171285)