Author(s): R. Gagnon; B. Quinton; J. Mackay
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Abstract: OCRE/NRC is planning on establishing a new capability in its Large Ice Tank. The new facility, known as the Heavy Impact Test Site (HITS), will enable studies of a large massive object colliding with a massive hybrid ice-structure target, similar to ocean-going vessel collisions with ice masses. Numerical simulations utilizing coupled explicit ALE/FEA were used to estimate loads that could be achieved in the new facility. The simulations were also intended to assist with the design of the apparatus. When fabricated, the actual equipment will consist of a heavy-mass flooded structure that serves as a mock ship hull, to which actual grillage structures can be attached, and a large flooded hybrid ice-structure that serves as a substantial impacted ‘ice mass’. Initially, three sets of striker-struck objects of differing sizes with approximate mass ratios of 1.00 (Large), 0.74 (Medium) and 0.55 (Small) were investigated for impact load generation capability. The simulations showed that the ‘Small’ impacting structure and impacted target objects could be used to generate sufficient impact loads to study collisions that involve grillage damage. This size is also the most feasible for practical handling purposes in the Ice Tank. Subsequently, two simulations were run using a naval vessel grillage, for an impact between stiffeners and an impact at a stiffener. The maximum plastic deflections of the plating were ~ 24 mm in the case where the impact occurred between stiffeners and ~ 11 mm when the ice impacted the plate in an area that had a stiffener behind it.
Year: 2018