Corrosion and Surface Technology Research Group       

Materials and Surface Engineering

Department of Mechanical Engineering

Technical University of Denmark     


Understanding of fatigue properties of flexible pipes materials used in oil and gas industry


Industrial PhD project with National Oilwell Varco, Denmark


Project focus on detailed investigation of the corrosion fatigue behavior of materials (mainly steels) used for flexible pipes under exposure conditions, thus containing CO2 and H2S, which are usually experienced in applications. The aim of the work is to develop mechanistic understanding and systematic test procedures.  The impact of exposure conditions, such as chemical content and temperature of the test solution as well as the partial pressure of the CO2 and H2S gases, on the corrosion rate, electrochemical nature of materials, and fatigue resistance will be investigated and correlated with surface morphology, microstructure and stress state including residual stresses in the component. In order to do so, samples will be exposed to different corrosive environments (Table 1) typical for annulus conditions.



For more information contact: Rajan Ambat, Associate Professor, Email:


Building 425, Section of Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark, DK 2800 Lyngby, Denmark