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RESEARCH PAPERS: Offshore Mechanics/Ocean Engineering/Arctic Engineering

Limit Analysis of Ice Sheet Indentation

[+] Author and Article Information
D. G. Karr

Martin Marietta Corporation, New Orleans, La. 70189

S. C. Das

Department of Civil Engineering, Tulane University, New Orleans, La.

J. Energy Resour. Technol 105(3), 352-355 (Sep 01, 1983) (4 pages) doi:10.1115/1.3230927 History: Received November 01, 1982; Revised May 06, 1983; Online October 22, 2009

Abstract

The methods of plastic limit analysis are used to determine the indentation pressures of a flat rectangular punch on an ice sheet. The ice sheet is idealized as a semi-infinite layer of elastic-perfectly plastic material. Lower bounds are computed by application of the lower bound limit theorem. The suitability of basic yield functions are assessed based on their ability to predict failure at demonstrated ice failure stress ratios. The particular yield functions that are employed include the generalized Mohr-Coulomb (or Drucker-Prager) criterion, a modified Drucker-Prager criterion, as well as a parabolic yield criterion used previously in literature on this topic. A study of the effects on indentation pressure of varying ice strength parameters is presented. Limit analysis solutions are obtained for plane stress conditions, and thus the applicability of a particular yield function can be evaluated for a range of ice strengths for indentation problems involving high aspect ratios.

Copyright © 1983 by ASME
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