SPS Technology was retained to design an impact resistant deck to protect an existing floor from damage due to a falling object. The protection deck is intended to resist penetration and to absorb and distribute the impact load of a 1.6 tonne object dropped from a height of 50m at an impact velocity of 31.3 m/s with 810 kJ of kinetic energy. Three design variations were developed and presented for consideration through a process of 3D modelling, finite element analysis and physical testing.

All versions of the SPS impact resistant deck consisted of an SPS panel to resist penetration of the impact object; collapsible elements to convert kinetic energy to plastic strain energy; and a base to distribute the remaining force to the floor. The three arrangements were assessed and optimised: a two-layer system using wide flange shapes, a three-layer system using channels and wide flange shapes, and a uniform honeycomb system.

Of the proposed options, the honeycomb protection deck system was the most effective in reducing the load on the floor and therefore became the preferred alternative.


Project Denison is the latest in SPS Technology’s investigations into Dropped Object Projection in the Maritime and Offshore industries.  Read more about our Rock Drop Tests showing how boulders — ranging from 200 kgs up to 2,100 kgs — were used to test the strength of SPS in 2004, and see our Rock Drop Test video on YouTube, as well as our Vehicle Barrier Pendulum Impact Test.

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