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Author: Michael G. Katona Publisher: ISBN: Category : Languages : en Pages : 60
Book Description
The most efficient design, construction, and use of polar-ice-shelf facilities for operation and parking of aircraft, cargo storage, and other purposes depends on a thorough and correct engineering analysis of the structural integrity of the sea-ice layer. The viscoelastic finite element analysis technique and computer program developed in this investigation have proven to be an accurate, versatile, and powerful tool for solving a wide class of boundary value problems including ar-bitrary axisymmetric and plane strain geometries subjected to quasi-static, symmetric loading, and layered half-space systems resting on a fluid foundation with arbitrary surface loading. The viscoelastic model includes independent bulk and shear relaxation functions charac-terized by exponential series. The computer program was exercised on several sample problems and compares favorably with classical solutions and experimental data. (Author, modified-PL).
Author: Michael G. Katona Publisher: ISBN: Category : Languages : en Pages : 60
Book Description
The most efficient design, construction, and use of polar-ice-shelf facilities for operation and parking of aircraft, cargo storage, and other purposes depends on a thorough and correct engineering analysis of the structural integrity of the sea-ice layer. The viscoelastic finite element analysis technique and computer program developed in this investigation have proven to be an accurate, versatile, and powerful tool for solving a wide class of boundary value problems including ar-bitrary axisymmetric and plane strain geometries subjected to quasi-static, symmetric loading, and layered half-space systems resting on a fluid foundation with arbitrary surface loading. The viscoelastic model includes independent bulk and shear relaxation functions charac-terized by exponential series. The computer program was exercised on several sample problems and compares favorably with classical solutions and experimental data. (Author, modified-PL).
Author: M. G. Katona Publisher: ISBN: Category : Ice mechanics Languages : en Pages : 156
Book Description
Increasing operational use od ice areas in polar regions has heightened the requirement for improved knowledge and techniques to analyze the behavior of sea ice. Previous studies on elastic behavior are reviewed with emphasis placed on plate analysis. Classical plate theory and the finite element method are compared in analyzing ice plates, with special attention given to sea-ice airfields. Since elastic analysis is not totally representative of actual ice behavior, a general formulation is presented which gives the assumptions and procedures for both viscoelastic and nonlinear domains of sea-ice behavior. A laboratory program is being initiated to determine material properties that are necessary to extend sea-ice analysis into the inelastic range. (Author).
Author: D. E. Nevel Publisher: ISBN: Category : Ice Languages : en Pages : 122
Book Description
The problem investigated in this thesis is the prediction of the deflection and stresses in a floating ice sheet under loads which act over a long period of time. This problem is currently important for oil exploration offshore in the Arctic. A review of analytical methods for predicting the bearing capacity of an ice sheet is given. The problem is formulated by assuming the ice is isotropic with a constant Poisson's ratio. The shear modulus is assumed to obey a linear viscoelastic model. The specific model selected is a series of one Maxwell model and two Voigt models. One of the Voigt models has a negative spring constant which produces tertiary creep. The ice model exhibits a primary, secondary, and tertiary creep response, similar to that observed in uniaxial creep tests of ice. The material properties in the viscoelastic model may be a function of the vertical position in the ice sheet, but all these material properties must be proportional to the same function of position. Using the thin-plate theory for the floating ice sheet, the solution is obtained for the deflection and stresses in the ice sheet for primary, secondary, and tertiary creep regions. It is then shown that for a load that is not distributed over a large area, the time-dependent part of the deflection and stresses is relatively independent of the load's distribution. For the elastic case, the stress significantly depends upon the load's distribution. Results are given for the deflection and stresses as a function of time and distance from the load. The maximum deflection and stresses occur at the center of the load. At this point the deflection increases with time, while the stresses decrease; i.e., the stresses relax. (Author).
Author: Michael Wallace Praskievicz Publisher: ISBN: Category : Difference equations Languages : en Pages : 162
Book Description
This work reviews two models of ice sheet interaction with a particular structural shape, an isolated circular pile. A new model is developed using classical small element elastic theory. The ensuing equations are reduced by an adaptation of circular symmetry from a plane stress, two-dimensional representations to an infinite number of one-dimensional representations. The equations are then solved numerically by a finite difference technique and a finite number of solutions are recombined into an approximation of the true solution. The model is extended to a viscoelastic formulation with the Maxwell model. Some results and conclusions concerning areas of potential material failure and frictional effects are drawn. The computer code used is included and suggestions for further improvements are noted. (Author).
Author: Michael G. Katona
Author: Michael G. Katona
Author: Michael G. Katona
Author: M. G. Katona
Author: Shunsuke Takagi
Author: A. S. J. Swamidas
Author: Cold Regions Research and Engineering Laboratory (U.S.)
Author: 
Author: D. E. Nevel
Author: 
Author: Michael Wallace Praskievicz