Kunal Kapoor - Academia.edu (original) (raw)
Related Authors
Norwegian University of Science and Technology
Uploads
Papers by Kunal Kapoor
Vortex induced vibrations (VIV) prediction is of interest for subsea jumpers or spools that are e... more Vortex induced vibrations (VIV) prediction is of interest for subsea jumpers or spools that are exposed to significant current/wave conditions near the seabed. The VIV induces cyclic flexural and torsional stresses in jumper/spool which leads to fatigue damage. Due to jumper/spool's topology characteristics, multi-axial stress states may exist. The recommended practices for such fatigue damage assessment by DNVGL-RP-F105 (2017 edition) [11] uses the first principal stress method together with the S-N curves. However, the S-N curves are normally based on uniaxial test data and do not represent the real stress state of the system.
Volume 5B: Pipelines, Risers, and Subsea Systems, 2019
Prediction of vortex induced vibration (VIV) and estimation of fatigue damage for subsea multi pl... more Prediction of vortex induced vibration (VIV) and estimation of fatigue damage for subsea multi planar structures exposed to significant current condition is an important topic for subsea engineering. Due to the multi-planar characteristics of structure, the VIV induced stress states of subsea jumper are normally with the combination of flexural and bending stresses. Consequently, the associated fatigue is a multi-axial fatigue problem. In this study a novel energy-critical plane method by Farahani [1][2] has been used for fatigue assessment instead of the traditional method with utilizing the stress range and SN curve, for example the 1st principle stress method as recommended by DNVGL-RP-F105 (2017) [3]. By using this method, the phase change of the stress from different modes is considered. A case study based on previous jumper experiments by ExxonMobil is included. Fatigue results have been compared with DNVGL-RP-F105 (2017) [3] approach. Advantages of energy-critical plane appro...
Vortex induced vibrations (VIV) prediction is of interest for subsea jumpers or spools that are e... more Vortex induced vibrations (VIV) prediction is of interest for subsea jumpers or spools that are exposed to significant current/wave conditions near the seabed. The VIV induces cyclic flexural and torsional stresses in jumper/spool which leads to fatigue damage. Due to jumper/spool's topology characteristics, multi-axial stress states may exist. The recommended practices for such fatigue damage assessment by DNVGL-RP-F105 (2017 edition) [11] uses the first principal stress method together with the S-N curves. However, the S-N curves are normally based on uniaxial test data and do not represent the real stress state of the system.
Volume 5B: Pipelines, Risers, and Subsea Systems, 2019
Prediction of vortex induced vibration (VIV) and estimation of fatigue damage for subsea multi pl... more Prediction of vortex induced vibration (VIV) and estimation of fatigue damage for subsea multi planar structures exposed to significant current condition is an important topic for subsea engineering. Due to the multi-planar characteristics of structure, the VIV induced stress states of subsea jumper are normally with the combination of flexural and bending stresses. Consequently, the associated fatigue is a multi-axial fatigue problem. In this study a novel energy-critical plane method by Farahani [1][2] has been used for fatigue assessment instead of the traditional method with utilizing the stress range and SN curve, for example the 1st principle stress method as recommended by DNVGL-RP-F105 (2017) [3]. By using this method, the phase change of the stress from different modes is considered. A case study based on previous jumper experiments by ExxonMobil is included. Fatigue results have been compared with DNVGL-RP-F105 (2017) [3] approach. Advantages of energy-critical plane appro...