Publicaties
Fracture mode analysis of cementitious mortars by simultaneous application of 4D-XCT and acoustic emission technique KU Leuven
Cementitious brittle construction materials are susceptible to fracturing due to their heterogeneous material composition and relatively weak bond between the aggregates and paste. Hence, enhanced methods of fracture analysis in these materials are an important subject of research. The acoustic emission technique (AET) is frequently used in the study of brittle construction materials, yet the random nature of cracking and the het erogeneity of ...
Defect detection in carbon fiber-reinforced plate by imaging of mechanical nonlinearity-induced sideband vibrations KU Leuven
Laser Doppler scanning vibrometry is used for imaging spectral vibration components in a carbon fiber-reinforced composite plate that contains a sub-surface delamination defect caused by hammer impact. The images reveal sideband generation at the location of the defect, reflecting mechanical nonlinearity-induced mixing between a high amplitude, low-frequency vibration that modulates the stress–strain behavior near the defect and a low amplitude, ...
Fatigue fracture quantification in brittle cementitious materials using acoustic emission testing and digital image correlation KU Leuven
Fatigue loading in brittle materials introduces damage at the micro-scale. These micro-fractures can accumulate and cause a significant reduction in material stiffness or even lead to structural failure. Deformation-based monitoring techniques can be inadequate when detecting damage at the micro-level. Hence, here is where advanced non-destructive testing (NDT) methods such as acoustic emission testing (AET) and digital image correlation (DIC) ...
Micromechanics-based variational phase-field modeling of Brazilian splitting tests KU Leuven
The simulation of the Brazilian splitting test can be challenging due to the presence of stress concentrations near the load points, which can lead to numerical problems and convergence issues. This paper aims to realistically model the Brazilian splitting test on mortar samples under monotonic loading, employing a micromechanics-based variational phase-field formulation. A micromechanics-based phase-field model connects the field variables at ...
Experimental Datasets and Model Uncertainty of Empirical Relations for Rebar Corrosion Assessment KU Leuven
Reinforcement corrosion in concrete structures entails numerous interacting parameters and processes. A general approach is to use corrosion-rate models to predict the corrosion level of existing structures, and subsequently update these predictions by means of on-site data. In this process, empirical models are often applied that relate the observed damage, such as corrosion-induced cracks, to the corrosion level. In this paper, an experimental ...
Resistive response of carbon-black-epoxy nanocomposites upon exposure to moisture KU Leuven
Water ingress in composite structures is an extremely costly problem, and its detection before related damage begins to appear is of utmost importance. Nanocomposites, based on epoxy matrices and Carbon Black fillers (CB), are promising humidity sensors that can be integrated in composite structures during production. Nevertheless, the effects of water uptake on the electrical properties of CB-epoxy films have scarcely been reported. Therefore, ...