Andrey P. Jivkov
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View article: The beneficial effect of agglomerations of inclusions on the fracture toughness of ceramic nanocomposites
The beneficial effect of agglomerations of inclusions on the fracture toughness of ceramic nanocomposites Open
Agglomerations of carbon‐based inclusions and the low adhesion of inclusion‐matrix interfaces are commonly viewed as detrimental to the strength and fracture toughness of ceramic composites. While large, high‐power agglomerations indeed pr…
View article: Transport Properties of Solutions in γ–FeOOH/CSH Pores of Steel Fiber-Reinforced Concrete (SFRC) Derived Using Molecular Dynamics
Transport Properties of Solutions in γ–FeOOH/CSH Pores of Steel Fiber-Reinforced Concrete (SFRC) Derived Using Molecular Dynamics Open
Steel fiber-reinforced concrete structures designed for marine environments can become compromised by the ingress of water and ions. Water and ion transport through the pores between steel fibers and concrete gels significantly affects the…
View article: Experimental study of marine ultra-high-performance concrete with coarse aggregate (UHPC-CA)
Experimental study of marine ultra-high-performance concrete with coarse aggregate (UHPC-CA) Open
Reported are the results of an investigation of the effects of coarse aggregate type and content on the workability, mechanical properties, and long-term durability of ultra-high-performance concrete (UHPC). UHPC specimens were prepared wi…
View article: Disorientation-based classification of mesostructures in severely deformed copper alloys
Disorientation-based classification of mesostructures in severely deformed copper alloys Open
Long-range interactions and correlations are distinctive attributes of non-equilibrium processes. A suitable tool for studying long-range interactions in polycrystalline materials is the orientation correlation function. It was introduced …
View article: Elevated temperature effects on swelling pressure of compacted bentonite
Elevated temperature effects on swelling pressure of compacted bentonite Open
Understanding the effects of temperature on the hydro‐mechanical behavior of compacted bentonite is important for performance assessments of bentonite‐based buffer, backfill, and sealing systems in deep geological disposal of high‐level ra…
View article: Calculus with combinatorial differential forms for fluid flow analysis in porous and fractured media
Calculus with combinatorial differential forms for fluid flow analysis in porous and fractured media Open
The fabric of porous and fractured media contains solid regions (grains) and voids. The space conducting fluids is a system of connected voids with variable geometries. Relative to the grain sizes, the voids can be voluminous with three co…
View article: Kinetic view on dynamic plasticity of crystalline solids
Kinetic view on dynamic plasticity of crystalline solids Open
Microstructural changes in solids, driven by energy flows, do not develop in a static continuous space, such as the space considered in conventional plasticity models. The applied forces create an evolving internal energy landscape, which …
View article: Gas migration at the granite–bentonite interface under semirigid boundary conditions in the context of high‐level radioactive waste disposal
Gas migration at the granite–bentonite interface under semirigid boundary conditions in the context of high‐level radioactive waste disposal Open
The corrosion of waste canisters in the deep geological disposal facilities (GDFs) for high‐level radioactive waste (HLRW) can generate gas, which escapes from the engineered barrier system through the interfaces between the bentonite buff…
View article: Semi-analytical predictive model for natural and artificial thawing of circular ground-ice walls
Semi-analytical predictive model for natural and artificial thawing of circular ground-ice walls Open
Artificial ground freezing (AGF) is a ground improvement technique enabling the construction of underground structures in challenging geological conditions. After constructing an underground structure within the ground-ice cofferdam, the s…
View article: Effect of dry-wet cycles on dynamic properties and microstructures of sandstone: Experiments and modelling
Effect of dry-wet cycles on dynamic properties and microstructures of sandstone: Experiments and modelling Open
Underground pumped storage power plant (UPSP) is an innovative concept for space recycling of abandoned mines. Its realization requires better understanding of the dynamic performance and durability of reservoir rock. This paper conducted …
View article: Discrete model for discontinuous dynamic recrystallisation applied to grain structure evolution inside adiabatic shear bands
Discrete model for discontinuous dynamic recrystallisation applied to grain structure evolution inside adiabatic shear bands Open
Discontinuous dynamic recrystallisation (DDRX) is a well-known phenomenon playing a significant role in the high-temperature processing of metals, including industrial forming and severe plastic deformations. The ongoing discussion on the …
View article: Modelling the piping-assisted erosion of clay barriers
Modelling the piping-assisted erosion of clay barriers Open
Recent laboratory and field experiments have provided evidence of the erosion and piping of clay-based barriers. Predicting these phenomena is essential for the performance assessment of bentonite barriers and containments. This paper pres…
View article: Peridynamic analysis of thermal behaviour of PCM composites for heat storage
Peridynamic analysis of thermal behaviour of PCM composites for heat storage Open
One possibility to utilise excess energy from electricity generation or other industrial processes is to use thermal energy storage systems based on phase change materials (PCM). These systems can accumulate and release significant amounts…
View article: A discrete model for force-based elasticity and plasticity
A discrete model for force-based elasticity and plasticity Open
The article presents a mathematical model that simulates the elastic and plastic behaviour of discrete systems representing isotropic materials. The systems consist of one lattice of nodes connected by edges and a second lattice with nodes…
View article: Discrete modelling of continuous dynamic recrystallisation by modified Metropolis algorithm
Discrete modelling of continuous dynamic recrystallisation by modified Metropolis algorithm Open
Continuous dynamic recrystallisation (CDRX) is often the primary mechanism for microstructure evolution during severe plastic deformation (SPD) of polycrystalline metals. Its physically realistic simulation remains challenging for the exis…
View article: Elevated temperature effects (T > 100 °C) on the interfacial water and microstructure swelling of Na-montmorillonite
Elevated temperature effects (T > 100 °C) on the interfacial water and microstructure swelling of Na-montmorillonite Open
Montmorillonite-based barriers are key elements of the engineered barrier systems (EBS) in geological disposal facilities (GDF). Their performance at temperatures above 100 °C is not sufficiently understood to assess the possibility of rai…