Development of a safety concept based on crack initiation philosophy for ship steels

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Development of a safety concept based on crack initiation philosophy for ship steels

Mannsfeld, A. / Langenberg, P. / Dahl, W.

There is still a need of a safe ship design because ship catastrophes due to brittle fracture still occur nowadays. The development of safety concepts is one possibility to minimize the probability of ship accidents in consideration of material selection, stresses and design temperature. A safety concept based on fracture mechanics which has been implemented successfully as a European Standard for Steel Bridges (Eurocode 3, Annex C) is adopted to several low strength and high strength ship steel grades in different delivery conditions (as rolled, normalized and thermomechanically controlled rolled). Also the existence of welds has been considered. As data input characteristic strength and toughness values were necessary. For this tensile tests and both Charpy- and fracture mechanics testing have been carried out. The fracture mechanics data was investigated statistically applying the Mastercurve concept. In addition a transition temperature correlation between the toughness values T(27J) and T(K100) was carried out. Large scale tests were performed to validate the concept based on a crack initiation philosophy. A quite good conformity could be found but there is still a need for a further investigation to optimize and adjust the concept for ships.