Spatial and temporal load variations in large-scale ice-structure interaction
Final Report Abstract
With the DFG project “Spatial and temporal load variations in large Scale Ice-Structure interaction - SoLStICE” a framework for ice-structure interaction tests in arctic conditions is developed. During the project several test facilities are constructed from scratch. Ice-structure interaction experiments and steal material tests under arctic conditions are conducted. Due to increasing activities in ice covered waters the research gain in importance. Our main results could be summarized as follows: Ice-structure interaction experiments in three different scales and a wide range of velocities are conducted. The developed test setups for medium and large scale experiments are suitable to perform tests against deformable and rigid structures. An extensive series of small scale and medium scale tests are performed. Similar results in different scales are observed. Tests with smaller strain rates have a ductile behaviour and at higher strain rates is the behaviour brittle. Ductile tests show an even pressure patch and much higher contact forces than brittle tests. The global behaviour is characterised by a line like behaviour of the tests. Ductile behaviour in medium scale is similar to the large experiment. - A process for the ice samples production in three different sizes is presented. In addition, all necessary machines are designed and constructed. A validation of the produced ice with compression experiments against literature values was successfully conducted. - Relevant effects of the pressure measurement system TekScan are evaluated. The calibration curve depends on the material compliance, the loading rate and the selected sensitivity of the system. A least square calibration for every specific test promises the best result in considering the complex material behaviour of ice. - Several material models for ice simulations are tested and different shortcomings of models are presented. A plan for the development of further ice models is presented. The framework of ice experiments in different scales and velocities gains a good basis for further material model development. - The large test frame for ice-structure interaction experiments has to be enhanced after two successfully conducted tests for further tests, to avoid further deformations at the confinement pipe. - Material tests for steal are conducted under Arctic conditions and different loading rates.
Publications
- Experimental investigation of an accidental ice impact on an aluminium high speed craft. In: Proceedings of the 6th International Conference on Marine Structures (MARSTRUCT 2017)
Herrnring, Hauke; Kubiczek, Jan Manuel; Ehlers, Sören; Niclasen, Niclas; Burman, Magnus
(See online at https://doi.org/10.1201/9781315157368-80)
