Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 110
Book Description
Beam Bending and Fracture Behaviour of Iceberg Ice
Author: Time-dependent Aspects of Fracture in Ice
Author: Mark Bradley KavanaghPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
An important aspect of ice fracture that is yet to be fully resolved in determining the loads and pressures during an interaction with ice is the presence and growth of fractures. Practical applications include icebreakers ramming into ice pack or structures operating in ice-prone regions. Existing models often use a simplified view of ice mechanics, often based on only the elastic properties, which tend to overestimate the strength of the ice. It has long been known that ice exhibits time-dependent properties, including its strength. This is known from ship ramming experience as well as field and laboratory experiments. Accounting for these time-dependent aspects of ice behaviour would allow for a more analytical approach to interaction modelling and complement the empirical data that is used currently in design practice. The aim of this thesis is to provide a better understanding of ice fracture that occurs during an interaction. To better understand the viscoelastic properties of ice, an extensive review of the literature was performed. In particular, an in-depth review of linear elastic fracture mechanics was performed, as it it critical to the foundations of the viscoelastic fracture theory. To guide the development of a new viscoelastic fracture model, three sets of experiments were performed. The first was an indentation series, scaled down from similar field experiments, that displayed several fracture properties of ice. These properties were rate-dependent fracture, delayed fracture, and scale effects. The next two series, designed to study a single crack, used ice samples under 4- point bending. The first of these were constant loading rate test to further study the rate-dependent fracture properties of ice, resulting in ice that is weaker under faster loading in a decreasing power law relationship. The second of these applied constant loads just below the breaking point to show that ice undergoes delayed fracture. The data suggests a decreasing power law between applied load and time to failure for these samples. Building on previous works in viscoelastic fracture theory, and making use of the insights gained from the experiments, a new model has been developed to predict the fracture properties of ice. The model accounts for the delayed fracture of ice and provides insights into the time-dependent fracture properties of ice, as was seen in the laboratory and field experiments. The model, based on viscoelastic theory, was shown to reasonably model time to failure for ice beams under constant load, as well as the fracture strength of ice beams under different loading rates. The model, besides expanding the old theories to beam bending geometries, was also shown to work for compact tension specimens with a few minor changes.
Iceberg Utilization
Author: A. A. HusseinyPublisher: Elsevier
ISBN: 1483159175
Category : Business & Economics
Languages : en
Pages : 782
Book Description
Iceberg Utilization covers the proceedings of the First International Conference and Workshops on Iceberg Utilization for Fresh Water Production, Weather Modification and Other Applications, held at Iowa State University, Ames, Iowa, USA on October 2-6, 1977. The book focuses on the efforts to consider the feasibility of using icebergs as alternative water and energy resources relative to the growing concern on global water and energy shortage. The compilation first offers information on the patterns of cooperation in international science and technology and evaluation of subsidiary effects and concomitant issues and challenges in iceberg utilization. The text also looks at the consideration of icebergs as potential water resource, including arctic drifting stations, remote sensing, and transport of icebergs. The book discusses elements of iceberg technology and remote sensing of thickness of icebergs, as well as sources and properties of tabular icebergs and towing, handling, processing, and selection of icebergs. The text also considers the international law problems in the acquisition and transportation of Antarctic icebergs; ecological considerations of iceberg transport from Antarctic waters; and energy and freshwater production from icebergs. The selection is a dependable reference for readers wanting to explore the potential of icebergs as energy and water resource.
Proceedings of the Conference on Use of Icebergs, Scientific and Practical Feasibility, Cambridge, UK, 1-3 April 1980
Author: Publisher:
ISBN:
Category : Science
Languages : en
Pages : 148
Book Description
This conference considered the feasibility of using icebergs from the Arctic and Antarctic for water supply for arid areas. Topics include iceberg characteristics, ocean circulation, drift of icebergs, melting and preservation, transport and handling, and environmental aspects.
Creep and Fracture of Ice
Author: Erland M. SchulsonPublisher: Cambridge University Press
ISBN: 0521806208
Category : Science
Languages : en
Pages : 403
Book Description
The first complete account of the physics of the creep and fracture of ice, for graduates, engineers and scientists.
Applied mechanics reviews
Author: A S T I S Current Awareness Bulletin
Author: Arctic Science and Technology Information SystemPublisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 560
Book Description
Ships and Offshore Structures XIX
Author: Carlos Guedes SoaresPublisher: CRC Press
ISBN: 1315647192
Category : Technology & Engineering
Languages : en
Pages : 976
Book Description
This three-volume work presents the proceedings from the 19th International Ship and Offshore Structures Congress held in Cascais, Portugal on 7th to 10th September 2015. The International Ship and Offshore Structures Congress (ISSC) is a forum for the exchange of information by experts undertaking and applying marine structural research.The aim of
Isostasy and Flexure of the Lithosphere
Author: A. B. WattsPublisher: Cambridge University Press
ISBN: 1009278924
Category : Science
Languages : en
Pages : 605
Book Description
A unique overview of isostasy featuring recent advances in spectral data analysis and understanding of variations in lithospheric strength.
The Mechanical Properties of Sea Ice
Author: W. F. WeeksPublisher:
ISBN:
Category : Ice mechanics
Languages : en
Pages : 100
Book Description
The review discusses the state of thinking of each of the main national groups investigating sea ice and gives an overall appraisal of the field as a whole. Emphasis is placed on (1) the physical basis for interpreting sea ice strength (phase relations, air volume, and structural considerations), (2) theoretical considerations (strength models, air bubbles and salt reinforcement, and interrelations between growth conditions and strength), (3) experimental results (tensile, flexural, shear, and compressive strength, elastic modulus, shear modulus and Poisson's ratio, time dependent effects, and creep), and (4) plate characteristics. The paper includes a review of problems in sea ice investigations, relates the chemical, crystallographic, mechanical, and physical aspects involved, and concludes by showing how to utilize this knowledge to solve practical problems. (Author).