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Numerical Simulation for Hydrogen-Assisted Cracking: An Explicit Phase-Field Formulation.

Di Wang1, Fangping Ma1, Hao Chen1

  • 1Department of Mechanical Engineering, Xinjiang University, Urumqi 830017, China.

Materials (Basel, Switzerland)
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new computational method to simulate hydrogen-assisted cracking in materials. The explicit phase-field formulation accurately models crack growth influenced by hydrogen, offering insights into material failure mechanisms.

Keywords:
FEMexplicit computationfailurehydrogen assisted crackingphase-field formulation

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Area of Science:

  • Materials Science
  • Computational Mechanics
  • Solid Mechanics

Background:

  • Hydrogen-assisted cracking is a critical failure mode in metal hydrogen-facing materials.
  • Existing research on numerical methods for hydrogen-assisted cracking is limited.
  • Understanding hydrogen embrittlement is crucial for material integrity.

Purpose of the Study:

  • To present a novel explicit phase-field formulation for modeling hydrogen embrittlement crack growth.
  • To develop a computational framework for simulating hydrogen-assisted cracking.
  • To investigate the influence of hydrogen on material failure under various conditions.

Main Methods:

  • Developed an explicit phase-field formulation integrating crack phase-field, Fick's diffusion law, and hydrogen-fracture energy relationships.
  • Utilized a self-developed Finite Element Method (FEM) software, DYNA-WD, for the computational framework.
  • Performed numerical simulations in 3-D coordinates for validation.

Main Results:

  • Validated the computational framework through simulations of diverse scenarios: square plate, CT specimen, plate with corrosives, and disk test.
  • Demonstrated the framework's effectiveness in capturing hydrogen embrittlement crack growth.
  • Investigated the interplay between Mises stress, hydrogen concentration, disc thickness, and loading rate.

Conclusions:

  • The proposed explicit phase-field formulation and computational framework provide a robust method for simulating hydrogen-assisted cracking.
  • The study offers valuable insights into the mechanisms of hydrogen embrittlement.
  • Numerical simulations confirm the framework's capability to predict material failure in hydrogenous environments.