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Item type:Publication, Access status: with files , The ISSC 2022 committee III.1-Ultimate strength benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads(Elsevier, 2021-06-03); ; ; ; This paper presents a benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads, initiated and coordinated by the ISSC 2022 technical committee III.1-Ultimate Strength. The overall objective of the benchmark is to establish predictions of the buckling collapse and ultimate strength of stiffened plate structures subjected to compressive loads. Participants were asked to perform ultimate strength predictions for a full-scale reference experiment on a stiffened steel plate structure utilizing any combination of class rules, guidelines, numerical approaches and simulation procedures as they saw fit. The benchmark study was carried out blind and divided into three phases. In the first phase, only descriptions of the experimental setup, the geometry of the reference structure, and the nominal material specifications were distributed. In the second phase, the actual properties of the reference structure were included. In the third and final phase, all available information on the reference structure and measured properties were distributed, including the material properties and laser-scanned geometry. This paper presents the results obtained from seventeen submitted FE simulations as well as details on the experiment. It also presents comparisons of the force versus the displacement curve, failure modes and locations for each phase, among others, and a discussion on the participants’ ability to predict the characteristics of the reference experiment with the information that is available for the phase. The outcome of the study is a discussion and recommendations regarding the design of finite element models for the ultimate state analysis of stiffened plate structures, with emphasis on the prediction of the ultimate capacity, force-displacement curve, and failure mode and location related to access to data, uncertainties and modeling of the material properties, geometric imperfections and distortions, and residual stresses.Publicationtype: Journal ArticleScopus© Citations 27 96 208 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Experimental and numerical analysis of a membrane cargo containment system for liquefied natural gas(Taylor & Francis, 2016-11-03); ; ; ; Membrane cargo containment systems (MCCS) have been developed by GTT for liquefied natural gas (LNG) tanks and proved to be an efficient technology for transportation and storage of large volumes. In regard to LNG as fuel, the current aim is to introduce MCCS as fuel tanks for merchant ships. These ships will operate in areas of high traffic density. The risk of collision and grounding cannot be neglected. The latter is bound by the deformation capacity of the inner barrier of the MCCS prior to LNG leakage. In order to contribute to the understanding of the crashworthiness, a large-scale nearly four-by-four-metre mock-up was built and tested experimentally at the Hamburg University of Technology (TUHH). These experimental results serve as a validation basis for numerical crashworthiness analysis of membrane-based cargo containment systems for LNG. In both numerical analysis and experimental testing, DNV GL has been involved.Publicationtype: Journal Article164 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Membrane containment system behavior in case of collisionIn order to respond to the more stringent regulations of the Emission Control Areas (ECA), LNG as a fuel is today recognized as a valuable alternative to HFO. The membrane technologies developed by GTT have proved for decades their efficiency for large Liquefied Natural Gas (LNG) transportation and storage. In the immediate future, membrane technology should equip smaller tanks of the 'LNG as a fuel' ship chain such as LNG bunker ships / barges or LNG fueled ships. Since those ships will operate in frequented harbours or routes, the risk associated to ship collision has to be specifically addressed. In this paper, statistical results of a collision risk analysis are first discussed to evaluate what is the associated probability of a container ship suffering a collision during its lifetime. On one hand, Finite Element Analysis allows the calculation of the deformation of the ship structure during identified collision events. Numerical results are supported by an empirical approach based on energy dissipation. On the other hand, maximum allowable deformations of membrane systems are demonstrated by experiments and numerical calculations. A safety assessment based on the structural response of the containment system under inner hull deformation is explained and supported by experience at sea.Publicationtype: Conference Paper70