Jan Henriksen

• Henriksen, Jan; Hansen, Michael Rygaard & Thrane, Fredrik Christopher (2017). Axial Load Capacity of Cold Formed Pipe Flange Connection. Journal of Pressure Vessel Technology. ISSN 0094-9930. 139(5). doi: 10.1115/1.4036853. Show summary

  In this paper, a cold forming process is used where the connection between a pipe and a flange is created by means of radially expanding tool segments inside the pipe. The method is investigated with two purposes, to set up a robust procedure for the process that allows for connections to be made on site, and to set up finite element (FE) simulations that can capture the forces and deformations when pulling the pipe axially out of the flange. Experimental data and FE simulations are used to describe and understand the forces and deformations during the connection process. The rapid increase in radial stiffness experienced when the pipe comes in full circumferential contact with the flange is identified as the best end-of-process indicator. Also, experimental data and FE simulations are used to predict the axial load capacity of a pipe flange connection, and the FE model is utilized in designing the appropriate ridge height of the tool segments.

• Henriksen, Jan; Nordhagen, Håkon Ottar; Hoang, Nguyen-Hieu; Hansen, Michael Rygaard & Thrane, Fredrik C. (2015). Numerical and experimental verification of new method for connecting pipe to flange by cold forming. Journal of Materials Processing Technology. ISSN 0924-0136. 220, p. 215–223. doi: 10.1016/j.jmatprotec.2015.01.018. Show summary

  In this paper a new method of connecting pipe to flange without welding is presented. This method is a cold forming process that is based on plastic expansion/deformation of the pipe into a modified standard flange by use of a cold forming tool. The method is patented by Quickflange Technology AS and represents a highly feasible alternative to welding. The successful use of the method requires the ability to predict dimensional and stress/strain characteristics of the pipe and flange after the connection process in order to evaluate the connectivity to the adjacent flange as well as the leak tightness. In addition the ability to predict the process force during the connection process is needed in order to control the process and design the hydraulically actuated cold forming tool. It is shown that it is possible to simulate this process using the finite element (FE) method and achieve a good accordance with experimental results. For this purpose a non-linear FE model of the flange, pipe and forming tool is developed and analyzed using Abaqus. Experimental work, including tensile material testing and Quickflange joining tests were carried out for material model calibration and Quickflange process model validation, respectively. The FE model results are in good accordance with experimental observations in terms of actuation force for the process, deformations and strains of pipe and flange during and after the process. It is concluded that the developed FE model is a useful tool for simulating the presented process within reasonable computational time as long as careful considerations are given to model complexity, material parameters, friction, and pipe geometry tolerances.

• Henriksen, Jan; Bak, Morten Kollerup & Hansen, Michael Rygaard (2011). A Method for Finite Element Based Modeling of Flexible Components in Time Domain Simulation in Knuckle Boom Crane. In Singh, Maneesh; Raj B. K. N., Rao & Liyanage, Jayantha Prasanna (Ed.), Proceedings of the 24th International Congress on Condition Monitoring and Diagnostics Engineering Management (COMADEM2011). COMADEM International. ISSN 0-9541307-2-3. p. 1215–1224. Show summary

  In this paper emphasis is on modeling of the flexibility of the different main structural components of an offshore knuckle boom crane. The modeling approach uses results from finite element analysis of the structural components to calibrate a multibody dynamic model of the crane. The calibration is a parameter identification that minimizes the deviation between the static and dynamic behavior of the finite element model of the beam like jibs of the crane with that of lumped beam models. The latter approach allows for an efficient simulation of tool point control schemes that takes into account all important structural deflections and vibrations.

View all works in Cristin

• Henriksen, Jan (2022). How agile teams make Objectives and Key Results (OKRs) work.
• Henriksen, Jan; Hansen, Michael Rygaard & Thrane, Fredrik Christopher (2018). Experimentally and Numerically Verified Analytical Model for Prediction of Process Force in Novel Method for Pipe-to-Flange Joining.
• Henriksen, Jan & Hansen, Michael Rygaard (2013). FEM simulation of cold deforming pipe into flange.
• Henriksen, Jan (2018). Model Based Design of Novel Cold Deformed Flange Connection Method. Universitetet i Agder. ISSN 978-82-7117-906-9.

View all works in Cristin