Stress measurements in drifting pack ice

Tucker, W. B.; Perovich, Donald K.

doi:10.1016/0165-232x(92)90012-j

Cited by 47 publications

(40 citation statements)

References 10 publications

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“…Consistent with this notion, at least for ice, is Sanderson's 4 observation that large fractures fail at lower stresses than small ones. Also consistent are recent measurements of stresses within floating covers, 71,75 which are usually within the kPa range as compared with the MPa range of lab measurements. The ductile flow of glaciers, on the other hand, reflects the power-law creep relationship of small test specimens, implying that dislocation-based processes are scale-independent.…”

Section: Ductile-brittle Transition Under Compressionsupporting

confidence: 83%

The structure and mechanical behavior of ice

Schulson

1999

JOM

266

175

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1983 through a development grant from Mobil Corporation. It was expanded in 1984 through an Army Research Office-URIP, expanded again in 1986 through an Office of Naval Research-URI, and expanded again in 1994 through a second Army Research Office-URIP. The IRL is a materials research facility housed within cold rooms. The laboratory currently consists of ten separate cold rooms, some capable of reaching below -40°C. Situated within are facilities for growing and characterizing ice of different kinds, preparing test specimens, and measuring mechanical and electrical properties.Since icebergs were first proposed as potential aircraft carriers in World War II, Erland M. Schulson research has led to a better understanding of the mechanical behavior of ice. While work remains, especially in relating fracture on the small scale to that on the larger scale and to the appropriate structural features, the groundwork in materials science has been laid. This paper presents an overview of the structure and mechanical behavior of polycrystalline terrestrial ice.

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Section: Ductile-brittle Transition Under Compressionsupporting

confidence: 83%

The structure and mechanical behavior of ice

Schulson

1999

JOM

266

175

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“…The modeled internal ice stress components s 11 and s 22 (s is the internal ice stress tensor [see Hunke and Dukowicz, 1997]) essentially oscillate at a semidiurnal rate, and Figure 9 provides the peak-to-peak amplitude of the internal ice stress ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi s 2 11 þ s 2 22 p oscillation at M 2 frequency, along with the thickness of the ice cover during March 2004. It is seen that the tidally induced ice stress is most important in Foxe Basin, with values of the same order of magnitude as semidiurnal fluctuations observed in the Barents Sea (25 to 50 kPa) [Tucker and Perovich, 1992].…”

Section: Effects Of the Tides Upon The Ice Coversupporting

confidence: 50%

On the modification of tides in a seasonally ice‐covered sea

2008

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[1] New observations from eight moorings located in Foxe Basin, Hudson Strait, and Hudson Bay are used to study the seasonal variability of the M 2 tide. Significant seasonal variations of the M 2 surface elevation are found in all these regions and at all seasons. The largest variations occur during winter while both elevation increase (Hudson Strait) and decrease (Hudson Bay, Foxe Basin) are observed. These variations are found recurrent at the stations where multiyear observations are available. Observations from a velocity profiler are consistent with a seasonal damping of the tides because of friction under ice. Numerical simulations with a sea ice-ocean coupled model and realistic forcing qualitatively reproduce most of the features of the observed variability. The simulations show that the winter M 2 variations are essentially caused by the under-ice friction, albeit with strong regional differences. Under-ice friction mostly occurs in a limited region (Foxe Basin) and can account for both increased and decreased M 2 elevations during winter.

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“…Similarly, if the comb-crack mechanism, also scale-independent, accounts for the large-scale features of Figure 27 [h/w ≈ 3; K c = 0.25 Mpa√m; µ = 0.5], then from Equation (17) those leads could have formed under in-field compressive stresses of ~3 kPa. Interestingly, these estimates are of the same order of magnitude as peak compressive stresses measured in pack ice, which typically range from 10 kPa to 100 kPa (Coon et al 1989;Tucker and Perovich 1992;Richter-Menge and Elder 1998). Unfortunately, unlike the laboratory, the field has not yet offered a direct comparison between the peak stresses and the underlying mechanical events.…”

Section: On the Formation Of "Leads" In The Arctic Sea Ice Covermentioning

confidence: 93%

Brittle Failure of Ice

Schulson

2002

Reviews in Mineralogy and Geochemistry

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Stress measurements in drifting pack ice

Cited by 47 publications

References 10 publications

The structure and mechanical behavior of ice

The structure and mechanical behavior of ice

On the modification of tides in a seasonally ice‐covered sea

Brittle Failure of Ice

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