Tim Hageman
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View article: Corrosion of metal reinforcements within concrete and localisation of supporting reactions under natural conditions
Corrosion of metal reinforcements within concrete and localisation of supporting reactions under natural conditions Open
Corrosion in concrete prevents in-situ observation, necessitating models to provide insight into the local reaction currents. We present a computational method for predicting corrosion rates of reinforcements within concrete under natural …
View article: Corrosion of metal reinforcements within concrete and localisation of supporting reactions under natural conditions
Corrosion of metal reinforcements within concrete and localisation of supporting reactions under natural conditions Open
Corrosion in concrete prevents in-situ observation, necessitating models to provide insight into the local reaction currents. We present a computational method for predicting corrosion rates of reinforcements within concrete under natural …
View article: An ice-specific phase-field fracture model for predicting brittle and ductile failure
An ice-specific phase-field fracture model for predicting brittle and ductile failure Open
The material behaviour of ice is complex: At short time scales it behaves as a brittle solid in extension, or a plastic material under compression/shear, whereas at longer time scales the visco-elastic behaviour dominates in all deformatio…
View article: The influence of firn layer material properties on surface crevasse propagation in glaciers and ice shelves
The influence of firn layer material properties on surface crevasse propagation in glaciers and ice shelves Open
Linear elastic fracture mechanics (LEFM) models have been used to estimate crevasse depths in glaciers and to represent iceberg calving in ice sheet models. However, existing LEFM models assume glacier ice to be homogeneous and utilize the…
View article: Ice viscosity governs hydraulic fracture that causes rapid drainage of supraglacial lakes
Ice viscosity governs hydraulic fracture that causes rapid drainage of supraglacial lakes Open
Full-thickness crevasses can transport water from the glacier surface to the bedrock where high water pressures can open kilometre-long cracks along the basal interface, which can accelerate glacier flow. We present a first computational m…
View article: Comment on egusphere-2024-660
Comment on egusphere-2024-660 Open
Abstract. Linear elastic fracture mechanics (LEFM) models have been used to estimate crevasse depths in glaciers and to represent iceberg calving in ice sheet models. However, existing LEFM models assume glacier ice to be homogeneous and u…
View article: Comment on egusphere-2024-660
Comment on egusphere-2024-660 Open
Abstract. Linear elastic fracture mechanics (LEFM) models have been used to estimate crevasse depths in glaciers and to represent iceberg calving in ice sheet models. However, existing LEFM models assume glacier ice to be homogeneous and u…
View article: Comment on egusphere-2024-346
Comment on egusphere-2024-346 Open
Abstract. Full thickness crevasses can transport water from the glacier surface to the bedrock where high water pressures can open kilometre-long cracks along the basal interface, which can accelerate glacier flow. We present a first compu…
View article: The influence of firn-layer material properties on surface crevasse propagation in glaciers and ice shelves
The influence of firn-layer material properties on surface crevasse propagation in glaciers and ice shelves Open
Linear elastic fracture mechanics (LEFM) models have been used to estimate crevasse depths in glaciers and to represent iceberg calving in ice sheet models. However, existing LEFM models assume glacier ice to be homogeneous and utilise the…
View article: Ice viscosity governs hydraulic fracture causing rapid drainage of supraglacial lakes
Ice viscosity governs hydraulic fracture causing rapid drainage of supraglacial lakes Open
Full thickness crevasses can transport water from the glacier surface to the bedrock where high water pressures can open kilometre-long cracks along the basal interface, which can accelerate glacier flow. We present a first computational m…
View article: Hydrogen uptake kinetics of cathodic polarized metals in aqueous electrolytes
Hydrogen uptake kinetics of cathodic polarized metals in aqueous electrolytes Open
We use a unique combination of electrochemical techniques to elucidate the\ndependency of hydrogen evolution reaction (HER) and absorption on pH and\noverpotential for iron and nickel. Impedance spectroscopy shows the dominance\nof the Vol…
View article: A phase field-based framework for electro-chemo-mechanical fracture: Crack-contained electrolytes, chemical reactions and stabilisation
A phase field-based framework for electro-chemo-mechanical fracture: Crack-contained electrolytes, chemical reactions and stabilisation Open
We present a new theoretical and computational framework for modelling electro-chemo-mechanical fracture. The model combines a phase field description of fracture with a fully coupled characterisation of electrolyte behaviour, surface chem…
View article: A Comparison of Plasticity Regularization Approaches for Geodynamic Modeling
A Comparison of Plasticity Regularization Approaches for Geodynamic Modeling Open
The emergence, geometry and activation of faults are intrinsically linked to frictional rheology. The latter is thus a central element in geodynamic simulations which aim at modeling the generation and evolution of fault zones and plate bo…
View article: Stabilising Effects of Lumped Integration Schemes for the Simulation of Metal-Electrolyte Reactions
Stabilising Effects of Lumped Integration Schemes for the Simulation of Metal-Electrolyte Reactions Open
Computational modelling of metal-electrolyte reactions is central to the understanding and prediction of a wide range of physical phenomena, yet this is often challenging owing to the presence of numerical oscillations that arise due to di…
View article: An electro-chemo-mechanical framework for predicting hydrogen uptake in metals due to aqueous electrolytes
An electro-chemo-mechanical framework for predicting hydrogen uptake in metals due to aqueous electrolytes Open
We present a theoretical and numerical scheme that enables quantifying hydrogen ingress in metals for arbitrary environments and defect geometries. This is achieved by explicitly resolving the electrochemical behaviour of the electrolyte, …
View article: Numerical modelling of lithospheric deformations with frictional plasticity
Numerical modelling of lithospheric deformations with frictional plasticity Open
<div><strong><em>Strain localisation is a key process that allows for the emergence of tectonic plates and controls their long-term deformation. Upper crustal levels are relatively cold and their rheology is thus governed…
View article: Direct simulation vs subgrid scale modelling of fluid flow in fractured or fracturing porous media
Direct simulation vs subgrid scale modelling of fluid flow in fractured or fracturing porous media Open
The accuracy and the limits of validity of the discontinuous pressure model, which describes fluid flow inside a fracture using a subgrid scale approach, is assessed by comparing simulation results with those from direct simulation using S…
View article: Stick‐slip like behavior in shear fracture propagation including the effect of fluid flow
Stick‐slip like behavior in shear fracture propagation including the effect of fluid flow Open
Shear‐based fracture propagation in fluid‐saturated porous materials is investigated using a displacement–pressure formulation that includes acceleration and inertial effects of the fluid. Pressure‐dependent plasticity with a nonassociated…
View article: Unequal order T-spline meshes for fracture in poroelastic media
Unequal order T-spline meshes for fracture in poroelastic media Open
Spline-based meshes allow for a higher inter-element continuity. For coupled problems, e.g. poroelasticity, different meshes with different orders of interpolation are normally used for the various fields in order to avoid spurious oscilla…
View article: Convergence in non‐associated plasticity and fracture propagation for standard, rate‐dependent, and Cosserat continua
Convergence in non‐associated plasticity and fracture propagation for standard, rate‐dependent, and Cosserat continua Open
The use of pressure‐dependent plasticity models with a non‐associated flow rule causes a loss of the well‐posedness for sufficiently low hardening rates. Apart from a mesh dependence, this can result in poor convergence, or even divergence…
View article: Isogeometric analysis of fracture propagation in saturated porous media due to a pressurised non-Newtonian fluid
Isogeometric analysis of fracture propagation in saturated porous media due to a pressurised non-Newtonian fluid Open
A model has been developed to simulate fractures which are pressurised using a non-Newtonian (power-law) fluid. The flow in the surrounding, deformable porous medium is described with a non-Newtonian fluid as well. The resulting model can …
View article: Heat transfer in finite sized particles suspensions
Heat transfer in finite sized particles suspensions Open
Heat transfer is important in many applications. For instance, due to the decrease in size of electronics, itbecomes more necessary to have efficient and smaller cooling systems. In order to increase the effect of thecooling liquids used, …