Call number:
ZSP-201-83/14
In:
CRREL Report, 83-14
Description / Table of Contents:
An analysis of ice fracture that incorporates dislocation mechanics and linear elastic fracture mechanics is discussed. The derived relationships predict a brittle to ductile transition in polycrystalline ice under tension with a Hall-Petch type dependence of brittle fracture strength on grain size. A uniaxial tensile testing technique, including specimen preparation and loading system design was developed and employed to verify the model. The tensile strength of ice in purely brittle fracture was found to vary with the square root of the reciprocal of grain size, supporting the relationship that the theory suggests. The inherent strength of the ice lattice and the Hall-Petch slope are evaluated and findings discussed in relation to previous results. Monitoring of acoustic emissions was incorporated in the tests, providing insights into the process of microfracture during ice deformation.
Type of Medium:
Series available for loan
Pages:
43 Seiten
,
Illustrationen
Series Statement:
CRREL Report 83-14
URL:
https://apps.dtic.mil/docs/citations/ADA134889
URL:
https://hdl.handle.net/11681/9340
Language:
English
Note:
CONTENTS
Abstract
Preface
Introduction
Background
Development of testing technique
Test specimens
Tensile testing
Compression testing
Experimental results
Tensile tests
Compression tests
Discussion
Conclusions
Suggestions for further work
Literature cited
Appendix A: Additional information on seed grains
Appendix B: Thin-sectioning procedure
Appendix C: Displacement transducer calibration
Location:
AWI Archive
Branch Library:
AWI Library
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