Motivation. Robust and lightweight materials and design for topside use in the arctic has been demanded by the industry. The density of aluminium is only one third of steel and may thus be an attractive alternative (to steel) to save weight. Examples of possible aluminium applications are helidecks, living quarters, stairs and gangways. Aluminium has also been extensively used as drilling pipes in regions with poor infrastructure and terrain making road transport difficult (e.g. Siberia). One other attractive functional property of aluminium is its high thermal conductivity which may be utilized to prevent icing or ice removal. Aluminium is also applied in LNG tanks, which demonstrates its excellent low temperature properties.

Objectives for 2013-2014.

  • Through a literature study of mechanical (and fracture) properties of Al and Al-alloys, and their weldments, at sub-zero temperatures – establish the knowledge gaps.
  • Perform experimental test series that will aim to cover the tensile, fracture and fatigue properties of welded 6082(T6) and 5083 plates at temperatures from -60 to 0 0C.
  • Based on experiments done, calibrate available material and fracture models and verify experiments with simulations.
  • Initiate work to start welding with Cold Metal Transfer technique.

Work description. The following tasks are included:

  • Effect of temperature on strength and ductility
  • Low temperature toughness/strength of weld
  • Low temperature fatigue behaviour
  • Numerical modelling
  • Welding trials with improved techniques

Published January 8, 2010