Strain gradient plasticity modeling of hydrogen diffusion to the crack tip

被引：84
|
作者：
Martinez-Paneda, E. [1 ]
del Busto, S. [1 ]
Niordson, C. F. [2 ]
Betegon, C. [1 ]
机构：
[1] Univ Oviedo, Dept Construct & Mfg Engn, Gijon 33203, Spain
[2] Tech Univ Denmark, Dept Mech Engn, Solid Mech, DK-2800 Lyngby, Denmark
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2016年 / 41卷 / 24期
关键词：
Strain gradient plasticity; Hydrogen embrittlement; Fracture mechanics; Hydrogen diffusion; Finite element analysis; ENVIRONMENT-ASSISTED CRACKING; HEAT-AFFECTED ZONE; PIPELINE STEEL; EMBRITTLEMENT; FRACTURE; DEFORMATION; STRESS; SIMULATION; TRANSPORT; GROWTH;
D O I：
10.1016/j.ijhydene.2016.05.014
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work hydrogen diffusion towards the fracture process zone is examined accounting for local hardening due to geometrically necessary dislocations (GNDs) by means of strain gradient plasticity (SGP). Finite element computations are performed within the finite deformation theory to characterize the gradient-enhanced stress elevation and subsequent diffusion of hydrogen towards the crack tip. Results reveal that GNDs, absent in conventional plasticity predictions, play a fundamental role on hydrogen transport ahead of a crack. SGP estimations provide a good agreement with experimental measurements of crack tip deformation and high levels of lattice hydrogen concentration are predicted within microns to the crack tip. The important implications of the results in the understanding of hydrogen embrittlement mechanisms are thoroughly discussed. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：10265 / 10274
页数：10
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