Berechnung der Energieabsorption der Stahlstruktur von Schiffen bei Kollision und Grundberuehrung

SIGLEAvailable from TIB Hannover: RA 489(613) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Structural design methods and documentation

International audienc

Life-Cycle Design. Teilvorhaben D2A: Seitenkollision von Doppelhuellenschiffen Abschlussbericht

Collision and grounding of ships are often the cause of serious ship accidents. These problems are of practical importance due to the formidable environmental implications of an accident involving ships carrying dangerous cargoes. In appraising the safety aspects of ships, therefore, it is necessary to investigate the effectiveness of the ship's double side structure. The purpose of this project was to improve ship safety by developing computational methods based on proven numerical techniques and validated by experimental measurements of a realistic collision test with existing ships. The semi-analytical DAMAGE computer code and Finite element (LS-DYNA) calculations are used to closely approximate the entire energy absorption process of the ship's side structure during collision. In comparison our numerical computations to evaluate the energy absorption of the side-structure are showing that it is possible to develop an effective ship structure. To assure the proposed calculation methods further research is necessary for consideration of friction and strain-rate effects. An interesting aspect: stability (energy absorption capacity) of double-hull-structures is increasing while filled with foam. (orig.)SIGLEAvailable from TIB Hannover: F00B748 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

Life-Cycle Design. Teilvorhaben D2: Grundberuehrung von Doppelhuellentankern Abschlussbericht

Grounding of ships is often the cause of serious ship accidents. The problem is of practical importance due to the formidable environmental implications of an accident involving ships carrying dangerous cargoes. Just as controversial discussions after the disastrous grounding of the tanker EXXON VALDEZ ceased to be of public interest, other less spectacular ship groundings occured. In appraising the safety aspects of ships, therefore, it is necessary to investigate the effectiveness of the ship's double bottom structure. The purpose of this project was to improve ship safety by developing computational methods based on proven numerical techniques and validated by experimental measurements of two realistic grounding tests with existing ships. The semi-analytical DAMAGE computer code was used to closely approximate the entire energy absorption process of the ship's bottom structure during grounding. However, the accuracy of this method decreased when predicting forces. At the present time only finite element calculations, such as DYNA3D or other suitable codes, are able to compensate for this lack of accuracy. Numerical computations to evaluate ultimate strength (breaking strain) and to asses the influence of friction and strain rate on energy absorption need further examination. (orig.)SIGLEAvailable from TIB Hannover: F98B1080 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Characteristics of material, ship side structure response and ship survivability in ship collisions

Research on ship collision and grounding has taken giant steps during the last decade. One reason is that computer capacity has increased and therefore also the possibility to simulate various collision scenarios in a realistic way using more advanced and large models. As a result, it has been possible to investigate in more detail the understanding of structural integrity, characteristics and failure phenomena that interact during, for example, a collision. This article summarises research experiences from a research group that has been working with ship collision safety, using both experiments and numerical simulations by finite element (FE) analysis. Results are presented from tensile and forming limit tests, followed by FE analyses of these with the objective of predicting material rupture using appropriate constitutive material models and damage criteria. An example of an innovative design of a side-shell structure that is considered being more intrusion-tolerant than most side-shell structures used today is demonstrated. Finally, results from a research project which has a holistic approach on the assessment of survivability of a struck ship are presented. In the project, a methodology has been developed which combines structural analysis, damage stability analysis followed by risk analysis