A5018596431- Hydrogen embrittlement and corrosion behaviors in metals
- Material Properties and Failure Mechanisms
- Fatigue and fracture mechanics
- Corrosion Behavior and Inhibition
- Mechanical stress and fatigue analysis
- Engineering Diagnostics and Reliability
- Nuclear Materials and Properties
- Metal Forming Simulation Techniques
- Structural Load-Bearing Analysis
- High Temperature Alloys and Creep
- Concrete Corrosion and Durability
- Microstructure and Mechanical Properties of Steels
- Non-Destructive Testing Techniques
- High-Velocity Impact and Material Behavior
- Mechanical Failure Analysis and Simulation
- Mechanical Behavior of Composites
- Welding Techniques and Residual Stresses
- Metallurgy and Material Forming
- Numerical methods in engineering
- Gear and Bearing Dynamics Analysis
- Structural Response to Dynamic Loads
- Composite Material Mechanics
- Drilling and Well Engineering
- Fusion materials and technologies
- Metal and Thin Film Mechanics
Universidad de Salamanca
2011-2023
S.P.E.C.I.E.S.
2003-2009
Pidstryhach Institute for Applied Problems of Mechanics and Mathematics
1997-2006
Institute of Blood Pathology and Transfusion Medicine of the National Academy of Medical Sciences of Ukraine
2006
Universidade da Coruña
1997-2001
G.V. Karpenko Physical-Mechanical Institute
1982-1993
Physico-Technical Institute
1984
Continuum modelling of hydrogen diffusion in metals, which accounts for both trapping and an imposed force field, is revisited. A generalised model developed as a continuous interpretation the discrete random-walk theory. system nonlinear equations describing phenomenon with multiple types traps derived without assumption local equilibrium among populations dissimilar positions. Lattice-trap interchange kinetics can degenerate into limit case. Moreover, certain terms general may be...
Abstract— This paper analyses the validity of fracture mechanics approach to hydrogen assisted cracking in metals on basis K ‐dominance over both stress‐strain state and accumulation process zone. Stress‐strain diffusion is considered as rate controlling factor under sustained or quasi‐static loading conditions. The discrepancy crack tip zone between far‐field affected asymptotically driven ( ‐controlled) elucidated. far field (i.e., which not ‐dominated) shown have a minor effect near‐tip...
The present work is based on previous research the one-dimensional (1D) analysis of hydrogen diffusion process, and proposes a numerical approach same phenomenon in two-dimensional (2D) situations, e.g. notches. weighted residual method was used to solve numerically differential equations set out when geometry discretized through application finite element method. Three-node triangular elements were discretization, due its simplicity, algorithm implemented obtain concentration distribution...
Prestressing steel wires usually undergo cyclic loading in service. Therefore, it is of interest to analyse certain features their mechanical behaviour under this type loading, such as the Bauschinger effect (BE) or hardening rule, that fit real appropriately. In study, different samples high strength pearlitic were subjected tension-compression load exceeding material yield strength, thus generating plastic strains. From experimental results, various parameters obtained revealing analysed...
Abstract Hydrogen degradation represents a problem of major technological concern in the structural integrity prestressed concrete structures which cold-drawn wires are main component and can suffer deleterious effect hydrogen, with subsequent risk catastrophic failure. This paper presents an innovative numerical analysis hydrogen prestressing steel wires, focused on two relevant variables influencing phenomenon transport by diffusion metal: residual stresses generated manufacture plastic...
Cold drawn wires of eutectoid pearlitic steel are widely used for prestressing concrete structures that usually work in harsh environments, so stress corrosion cracking is a problem major technological concern. In this paper previous model developed by the authors applied to analyse influence residual stress-and-strain profiles after cold drawing on hydrogen embrittlement susceptibility wires. Numerical results show relevant role both and strain field diffusion material
The calculation model is developed to evaluate the residual lifetime of a pipe with crack considering in-service degradation pipeline steel and effect soil corrosion. based on first law thermodynamics. problem determination period subcritical growth in reduced differential equation subjected definite initial final conditions. Obtained together boundary conditions are used for prediction made X52 steel. contains external surface semi-elliptical crack. task consists time propagation through...
This paper analyzes the evolution of Vickers micro-hardness in progressively drawn eutectoid steels focussing study on characteristic sections wires. The average value was calculated for each section according to its symmetry, thus studying variation these values with cold drawing. indentation marks after tests demonstrate anisotropy caused by drawing process itself steel, and a finite element modelling allows one finish material characterization.
In hydrogen assisted cracking, hydrogenation and crack growth are coupled processes. Consequently, particular histories of stress intensity factor K size evolutions influence rate v that can occur at the same instantaneous in a given material. Thus, curve = v(K) general does not possess uniqueness as intrinsic material's property. This paper provides an analytical treatment problem by stress-strain diffusion.