On the Crashworthiness of Steel-Plated Structures in an Arctic Environment: An Experimental and Numerical Study

2010 ◽  
Author(s):  
Jeom Kee Paik ◽  
Bong Ju Kim ◽  
Sung Kuk Park ◽  
Do Kyun Kim ◽  
Chang Hee Park ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Numerical Study ◽  
Limit State ◽  
Arctic Region ◽  
Offshore Structures ◽  
The Arctic ◽  
Strength Performance ◽  
Arctic Environment ◽  
American Society ◽  
Crushing Behavior

The aim of this study is to investigate the crashworthiness characteristics of steel-plated structures subject to low temperatures that are equivalent to the Arctic environment. Structural crashworthiness with regard to crushing and fracture is a key element in the strength performance assessment of ship collisions in the Arctic, which provides the primary motivation for the study. This article is a sequel to the authors’ previous paper [1]. In contrast to the previous paper, which dealt with test structures made of American Society for Testing and Materials (ASTM) A500-type carbon steel with the wall slenderness coefficient (b/t) of 37.5, the present paper considers grade A steel with the wall slenderness coefficient (b/t) of 25. Crushing tests are undertaken on square tubes subject to a quasi-static crushing load at both room and low temperatures. The effect of low temperatures on the material properties is examined on the basis of tensile coupon test results. The crushing behavior of the square tubes in this test is compared with LS-DYNA computations. It is found that low temperatures have a significant effect on the crashworthiness of steel-plated structures in terms of mean crushing loads and brittle fracture. The use of grade A steel for ships and offshore structures in an Arctic environment is not relevant. The modeling techniques for the structural crashworthiness analysis presented in this paper are found to be pertinent by comparison with experimental results and nonlinear finite element method computations. It is suggested that the collision-accidental limit state design of ships intended to operate in the Arctic region be carried out by taking the effect of low temperatures into account.

On the Crashworthiness of Steel-Plated Structures in an Arctic Environment: An Experimental and Numerical Study

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Dae Kyeom Park ◽  
Do Kyun Kim ◽  
Chang-Hee Park ◽  
Dong Hee Park ◽  
Bong Suk Jang ◽  
...  
Keyword(s):  
Material Properties ◽  
Low Temperatures ◽  
Numerical Study ◽  
Limit State ◽  
Arctic Region ◽  
Tensile Tests ◽  
The Arctic ◽  
Strength Performance ◽  
Arctic Environment ◽  
Crushing Behavior

Structural crashworthiness with regard to crushing and fracture is a key element in the strength performance assessment of ship collisions in the Arctic. The aim of this study is to investigate the crashworthiness characteristics of steel-plated structures subject to low temperatures that are equivalent to the Arctic environment. The effect of low temperatures on the material properties is examined on the basis of tensile tests. Crushing tests are undertaken on steel-square tubes subject to a quasi-static crushing load at both room and low temperatures. The crushing behavior of the square tubes in this test is compared with ls-dyna computations. It is found that low temperatures have a significant effect on not only the material properties but also the crashworthiness of steel-plated structures in terms of mean crushing loads and brittle fracture. It is suggested that the collision-accidental limit state design of ships intended to operate in the Arctic region should be carried out by taking the effect of low temperatures into account.

Climatic variations in Arctic region in Cretaceous and Cenozoic

2019 ◽  
pp. 30-37
Author(s):  
R. R. Gabdullin ◽  
N. V. Badulina ◽  
Yu. I. Rostovtseva ◽  
A. V. Ivanov
Keyword(s):  
Low Temperatures ◽  
Marine Invertebrates ◽  
Membrane Lipids ◽  
Arctic Region ◽  
The Arctic ◽  
Climatic Variations ◽  
History Of ◽  
Climatic History ◽  
Dinosaur Teeth ◽  
The Arctic Region

As a result of the analysis of published sources, a database on paleotempertures for the Arctic and Subarctic regions was collected on the skeletons of marine invertebrates, marine palynomorphs, dinosaur teeth, analysis of the ability of reptiles to lay eggs at low temperatures, continental flora (CLAMP-analysis), on the presence of coal layers in continental sediments within Arctic region, on membrane lipids of glycerol and dialkylglycerol tetraether in marine sediments and glendonite. Based on it, a paleotemperature curve was constructed for the Arctic region for the Cretaceous-Cenozoic span of geological history, which has common trends with the global paleotemperature curve [Scotise, 2015] (with the exception of cooling in the Tortonian age due to local factors). In the climatic history of the Arctic 16 climatic cycles have been established, comprising 16 climatic minima (including the glaciation in the Northern Hemisphere) and 15 climatic maxima.

Man and the Arctic Environment: Parameters of Reciprocal Influence

2018 ◽  
Vol 9 (5) ◽  
pp. 955
Author(s):  
Marina L. BELONOZHKO ◽  
Oleg M. BARBAKOV ◽  
Lyudmila K. GABISHEVA
Keyword(s):  
Legal Status ◽  
Arctic Region ◽  
Environmental Crisis ◽  
The Arctic ◽  
Anthropogenic Effect ◽  
Arctic Environment ◽  
Reciprocal Influence ◽  
Environmental Development ◽  
Definition Of ◽  
The Arctic Region

The paper deals with the analysis of specific parameters of reciprocal influence between man and the Arctic environment, the formulation of the theoretic provisions, as well as the development of the scientific conclusions regarding the definition of the perspectives and peculiarities of the Arctic Region environmental development under conditions of globalization and the world environmental crisis. As the results of the conducted research, the authors revealed and generalized the scientific approaches towards the definition of the legal status of the Arctic; stated the legal contents and the meaning of the basic environmental standards and programs of the international legislation regarding the Arctic Region; considered the spheres of influence of the states on the Arctic territory and on the environmental situation of this region in general; characterized the environmental conditions for living of the Arctic population; and defined the nature of the adverse anthropogenic effect on the environment of the investigated region. The analysis of the literature helped to formulate the theoretical conclusions, to develop the practical recommendations and to forecast the long-run perspectives and peculiarities of the Arctic environmental development. It is substantiated that the reciprocal influence between man and the environment in the territory of the Arctic Region moves towards a qualitatively new stage, which forces the states to adopt the strategical decisions in the sphere of the reclamation of the Arctic Region only considering the preservation of the ecosystem, provision of the proper living quality of the Arctic population, as well as the environmentalization of all the kinds of economic activities in the region. The paper contains the scientific substantiation and proposes the development of the Concept of Sustainable Development and Preservation of the Ecosystem for the Arctic Region, which will also include the monitoring system for the condition of the Arctic.

Validation of Pack Ice Resistance in Oblique Condition by the Comparison With Ice Model Test Results

2019 ◽  
Author(s):  
HyunSoo Kim ◽  
Erinc Ozden ◽  
Jae-bin Lee
Keyword(s):  
Model Test ◽  
Construction Projects ◽  
Arctic Region ◽  
Resource Development ◽  
Offshore Structures ◽  
The Arctic ◽  
Pack Ice ◽  
Ice Model Test ◽  
Ice Resistance ◽  
The Arctic Region

Abstract Countries around the world are increasingly interested in resource development in the Arctic due to global warming. Recently, Arctic coastal states (Russia, USA, Canada, etc.) are pursuing infrastructure construction projects for resource development in the Arctic region. Because the offshore structures in the Arctic are exposed to the sea ice, in order to ensure the safety of the structures, the calculation of the ice resistance is of paramount importance for offshore structures. In general, studies on the ice resistance have been carried out for the breaking and clearing performance of icebreakers. However, in the case of fpu (floating production unit) for resource development in the Arctic region, it is necessary to estimate the ice resistance in the oblique condition to ensure safety. Thus, despite estimation of the ice resistance in the oblique condition is significant, there has not been enough research until recently. In this paper, we suggest algorithms for estimating the ice resistance in the oblique condition. For the estimation process, an in-house code software program is used and an ice resistance estimation module is implemented for the oblique condition using empirical formula. This paper shows results of the ice resistance which was calculated in the oblique condition, and the change of the ice resistance is shown according to various oblique angles in pack ice. In addition, the results are compared to the model test result of a fpu in pack ice of 80% concentration.

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