Mechanics

Download Moving Loads on Ice Plates by Vernon A. Squire, Roger J. Hosking, Arnold D. Kerr, Patricia PDF

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By Vernon A. Squire, Roger J. Hosking, Arnold D. Kerr, Patricia J. Langhorne (auth.)

Moving lots on Ice Plates is a different examine into the influence of cars and plane traveling throughout floating ice sheets. It synthesizes in one quantity, with a coherent topic and nomenclature, the varied literature at the subject, hitherto on hand purely as examine magazine articles. Chapters at the nature of clean water ice and sea ice, and on utilized continuum mechanics are integrated, as is a bankruptcy at the subject's venerable background in similar parts of engineering and technological know-how. the latest theories and knowledge are mentioned in nice intensity, demonstrating the complicated country of the modelling and experimental box programmes that experience taken position. ultimately, effects are interpreted within the context of engineering questions confronted by way of firms working within the polar and subpolar areas.
even if the booklet unavoidably includes a few graduate point utilized arithmetic, it really is written to permit engineers, physicists and mathematicians to extract the knowledge they wish with out turning into preoccupied with information. Structural, environmental, civil, and offshore engineers, and teams who help those industries, rather in the Arctic and Antarctic, will locate the ebook well timed and relevant.

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Models based on thermodynamic and micromechanical princi- 36 CHAPTER 2 pIes, such as those by Sji::ilind (1987), Shyam Sunder and Wu (1989, 1990), Premachandran and Horii (1994), are more difficult to compare with the results of experiment, typically requiring finite element packages for their evaluation. Microcracking is included in the models of Santaoja (1989), Choi and Karr (1989), and Zhan et al. (1994). , 1994). We choose to describe a phenomenological, non-linear creep equation for unidirectionally frozen, orthotropic, columnar ice.

The reader may be forgiven for questioning the relevance of a constant load creep test to the problem of a moving load on an ice plate. The rationale is this. A huge portion of the study of the mechanical properties of ice has been concerned with the response of ice to constant stress or to a constant strain rate. Naturally rheological models will reflect this prejudice. In the absence of a complete picture of the cyclic response of ice we tend to consider the moving load problem in terms of strain rate.

In cyclic loading experiments, Cole and coworkers have noted that the first cycle modulus differs from values for subsequent cycles. 19. We may draw the following conclusions regarding the modulus. At low temperatures and high strain rates the partially relaxed modulus is roughly STRUCTURE AND PROPERTIES OF ICE PLATES 45 equal to the unrelaxed or true Young's modulus. 19. More details on partially relaxed (effective) moduli are given in Mellor (1983) and Cox and Weeks (1988). 1. Introduction This chapter introduces the equations of continuum mechanics used in the book to describe the action of a load moving over a continuously supported plate.

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