Publications
A novel calibration procedure of Johnson-Cook damage model parameters for simulation of scratch abrasion Ghent University
Numerical simulation of scratch abrasion requires the use of a material damage model to simulate material degradation and removal. From our previous research, the stress state during scratch was found to show negative values of stress triaxiality and Lode angle parameter. However, models are “classically” calibrated using experiments with positive triaxiality and Lode angle parameter. In this work, a novel “scratch-based” calibration procedure ...
Investigation of the dynamic strain aging effect in austenitic weld metals by 3D-DIC Ghent University
Austenitic stainless steels similar to type AISI 316L are widely used structural materials in current and future nuclear reactors. Careful development and characterization of these materials and their welds is needed to verify the structural integrity of large-scale multicomponent structures. Understanding the local deformation behavior in heterogeneous materials and the mechanisms involved is key to further improve the performance and ...
Front face strain compliance for quantification of short crack growth in fatigue testing Ghent University
Short fatigue crack growth investigation is of considerable scientific interest as it comprises a significant portion of the total fatigue life of a structure. It is very challenging to accurately quantify this stage of fatigue crack growth experimentally. In this article, a novel front face strain compliance technique for single-edge notched specimens subjected to four-point bending is proposed. Finite element analysis is performed to determine ...
Modeling of hydrogen-charged notched tensile tests of an X70 pipeline steel with a hydrogen-informed Gurson model Ghent University
Hydrogen can degrade the mechanical properties of steel components, which is commonly referred to as “hydrogen embrittlement” (HE). Quantifying the effect of HE on the structural integrity of components and structures remains challenging. The authors investigated an X70 pipeline steel through uncharged and hydrogen-charged (notched) tensile tests. This paper presents a combination of experimental results and numerical simulations using a ...
Effect of stress triaxiality on the hydrogen embrittlement micromechanisms in a pipeline steel evaluated by fractographic analysis Ghent University
Hydrogen gas, as an energy carrier, is expected to play an important role in the storage and transport of energy produced by renewable sources. The transport of hydrogen gas can be managed through the use of existing pipeline networks. However, the uptake of hydrogen in steel structures is known to cause a degradation of mechanical properties, a phenomenon called hydrogen embrittlement (HE). In this study, the hydrogen-assisted ductility loss of ...
Confirming debonding of non-metallic inclusions as an important factor in damage initiation in bearing steel Ghent University
Damage in bearings is closely associated with the presence of microstructural alterations, known as white etching areas (WEAs) and white etching cracks (WECs). One of the main reasons for the creation of these microstructural alterations is the presence of defects in the material, such as non-metallic inclusions. Manganese sulfides and aluminum oxides are widely reported in the literature as the most common types of non-metallic inclusions found ...
Influence of stress triaxiality on hydrogen assisted ductile damage in an X70 pipeline steel Ghent University
The presence of hydrogen in steel components affects their structural integrity through a phenomenon called hydrogen embrittlement. While it is known that hydrogen affects the mechanical damage development upon loading, the specific mechanisms are still unclear. An experimental study is presented that investigates the plastic anisotropy and ductile fracture behavior of API 5L X70 pipeline steel with and without hydrogen charging at multiple ...
Fractographic study of quasi-static tensile tested, electrochemically hydrogen charged X70 pipeline steels Ghent University
Fractography evaluates surface features of failed materials to understand causes of failure and subsequently enhance material performance. This work discusses different features identified on quasistatic tensile tested, electrochemically hydrogen charged X70 pipeline steel. Ex-situ quasi-static tensile testing is performed on smooth round bars at two conditions: in air as the reference condition and after electrochemical hydrogen charging in ...
Smart S-N curve for fatigue lifetime predictions of offshore wind turbine support structures affected by corrosion Ghent University
The lifetime of steel support structures for offshore wind turbines is affected by fatigue and corrosion damage. Due to the time-variant uncertainties associated with environmental conditions and mechanical stresses, numerical models that can accurately predict corrosion and fatigue deterioration are needed for a reliable assessment of structural integrity. One of the main ambitions of the project MAXWind is to develop a numerical framework for ...