Multiaxial testing on the Hexapod test rig in cooperation with National University of Singapore

From May13th to 16th, two scientists from National University of Singapore (NUS) visited the TUHH to test newly designed oil risers on the DFG-funded multiaxial test rig of the TUHH. For the oil risers the envelope of the maximum tension and bending loads was determined in several experiments. The results are used to validate the detailed numerical simulation by the NUS of the high-strength oil risers made ​​of carbon fiber reinforced plastics (CFRP) and aluminum. The new design with an optimised load transfer between CFRP and aluminum and a high load capacity with low weight enables significantly longer risers for deepwater oil production. For the realistic application of the combined loading conditions, the multiaxial control system of the hexapod with its six independent translational and rotational degrees of freedom could ideally be used. 

The risers were developed at NUS and tested as part of the BMBF -funded project GeSACC for research cooperation between Prof. Krause, head of the Institute for Product Development and Mechanical Engineering, and the Department of Mechanical Engineering of the National University of Singapore in Hamburg. The test planning and development was carried out in a bilateral exchange of scientists from both universities with visits to Hamburg and Singapore. For the experiments, the Deputy Head of the Mechanical Engineering Department of NUS, Prof. Vincent Tan, and the scientist Dr. Chen Yu from Singapore traveled to Hamburg. In addition to the tests, the agenda of their visit contained a visit to the CFRP Valley in Stade as well as the DFG Workshop for multiaxial Simulation and Testing in Brunswick.