A phase field formulation for dissolution-driven stress corrosion cracking
نویسندگان
چکیده
We present a new theoretical and numerical framework for modelling mechanically-assisted corrosion in elastic-plastic solids. Both pitting stress cracking (SCC) can be captured, as well the pit-to-crack transition. Localised is assumed to dissolution-driven formulation grounded upon film rupture-dissolution-repassivation mechanism presented incorporate influence of passivation. The model incorporates, first time, role mechanical straining electrochemical driving force, accelerating kinetics. computational complexities associated with tracking evolving metal-electrolyte interface are resolved by making use phase field paradigm, enabling an accurate approximation complex SCC morphologies. coupled electro-chemo-mechanical numerically implemented using finite element method implicit time integration scheme; displacements, order parameter concentration primary variables. Five case studies particular interest addressed showcase predictive capabilities model, revealing excellent agreement analytical solutions experimental measurements. By these paradigmatic 2D 3D boundary value problems we show that our capture: (i) transition from activation-controlled diffusion-controlled corrosion, (ii) sensitivity kinetics stresses strains, (iii) passivation reducing rates, (iv) dependence stability passive local strain rates. factors shape change defects, including transition, natural outcome laying foundations mechanistic assessment engineering materials structures.
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ژورنال
عنوان ژورنال: Journal of The Mechanics and Physics of Solids
سال: 2021
ISSN: ['0022-5096', '1873-4782']
DOI: https://doi.org/10.1016/j.jmps.2020.104254