Quasi-static assessment of response to slamming impact on free fall lifeboats
Paper in proceedings, 2015

Design against impact loads (slamming) can be challenging and time consuming and can involve complex calculations. Application of simplified, quasi-static calculation approaches will make the design process much easier. In this paper, such simplified methods are discussed using free fall lifeboats as a case. Results from non-linear FE-analysis show that the response is non-linear due to large deformations. The impact pressure is then mainly carried by membrane stress and the dynamic response is small. A non-linear beam theory approach for hand calculation is established. As the non-linear calculation model is the most realistic, it is recommended that this is used in an initial design assessment. Although the results are on the conservative side, simple hand calculations including non-linear geometry can be used to predict the maximum strain. Linear methods are also investigated. However, these methods should be used with more rigid structures such as stiffened steel and aluminium panels.

free fall lifeboats


Quasi-static response


Svein Erling Heggelund


Zhiyuan Li

Chalmers, Shipping and Marine Technology, Marine Technology

Beom-Seon Jang

Seoul National University

Jonas Ringsberg

Chalmers, Shipping and Marine Technology, Marine Technology

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE

Vol. 3 1-10 OMAE2015-41810

The ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2015)
St John's, NL, Canada,

Chalmers Area of Advance Transport – funding 2015

Chalmers, 2015-01-01 -- 2015-12-31.

Subject Categories

Materials Engineering

Vehicle Engineering

Areas of Advance


Materials Science


Basic sciences



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