0
RESEARCH PAPERS: Arctic Engineering

Criteria for Crack Nucleation in Polycrystalline Ice

[+] Author and Article Information
M. S. Wu

Department of Engineering Mechanics, University of Nebraska-Lincoln, Lincoln, NE 68588

S. Shyam Sunder

Department of Civil Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Offshore Mech. Arct. Eng 113(3), 266-273 (Aug 01, 1991) (8 pages) doi:10.1115/1.2919930 History: Received January 15, 1991

Abstract

A theoretical analysis of crack nucleation in isotropic polycrystalline ice due to the elastic anisotropy of the constituent crystals has recently been presented by Shyam Sunder and Wu [1]. Subsequently, Shyam Sunder and Nanthikesan [2] have analyzed crack nucleation in polycrystalline ice that is isotropic but porous. The singularity of the stress concentrations near a grain boundary facet junction provides the mechanism for inducing microcrack precursors, if similar nuclei do not already exist. The total stress field is obtained by linearly superposing the microstructural stress field created by the elastic anisotropy mechanism on the applied stress field. Assuming plane stress conditions, the analysis of the nucleation stress is based on a solution to the problem of an extending precursor in a combined stress field including the effects of Coulombic frictional resistance. In the earlier papers, the local material resistance is characterized in terms of a critical value for the maximum principal tensile stress, MPTS, (Erdogan and Sih [3]). This paper compares the nucleation stresses for uniaxial and biaxial loading conditions obtained previously with those obtained from the use of a critical strain energy density, SED, factor (Sih [4]) to characterize the local material resistance. The results, synthesized into biaxial nucleation surfaces, are compared with the limiting tensile strain, LTS, criterion of Shyam Sunder and Ting [5]. The critical precursor orientation and the incipient growth direction for the two models are also compared.

Copyright © 1991 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In