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<p>This study investigates hydrogen-assisted cracking in API X80 pipeline steel using an electro-chemo-mechanical phase-field fracture framework combined with structured parametric and surrogate-assisted analysis. Hydrogen transport, trapping, surface adsorption, and mechanical loading are examined through a five-dimensional design space explored using a Taguchi design of experiments. Gaussian Process Regression is used to capture nonlinear parameter effects, Sobol indices quantify global sensitivity, and Bayesian optimization identifies parameter regions associated with reduced hydrogen uptake and crack tip stress. The results show that trap concentration and binding energy primarily govern lattice hydrogen concentration, whereas lattice diffusivity and imposed displacement dominate crack tip hydrostatic stress. A two-trap extension further shows that shallow and deep traps strongly affect hydrogen magnitude and spatial distribution, although the dominant trends in stress response remain unchanged. Comparison with published permeation, TDS, and SSRT data for API X80 supports the mechanistic consistency of the model under controlled NaOH-based charging conditions.</p>

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Identifying Dominant Drivers of Hydrogen-Assisted Failure in API X80 Steel Using Phase-Field Simulation and Surrogate Analysis

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • S. Dhanish,
  • Jerzy Szpunar

摘要

This study investigates hydrogen-assisted cracking in API X80 pipeline steel using an electro-chemo-mechanical phase-field fracture framework combined with structured parametric and surrogate-assisted analysis. Hydrogen transport, trapping, surface adsorption, and mechanical loading are examined through a five-dimensional design space explored using a Taguchi design of experiments. Gaussian Process Regression is used to capture nonlinear parameter effects, Sobol indices quantify global sensitivity, and Bayesian optimization identifies parameter regions associated with reduced hydrogen uptake and crack tip stress. The results show that trap concentration and binding energy primarily govern lattice hydrogen concentration, whereas lattice diffusivity and imposed displacement dominate crack tip hydrostatic stress. A two-trap extension further shows that shallow and deep traps strongly affect hydrogen magnitude and spatial distribution, although the dominant trends in stress response remain unchanged. Comparison with published permeation, TDS, and SSRT data for API X80 supports the mechanistic consistency of the model under controlled NaOH-based charging conditions.