Ice Engineering - study of Related Properties of Floating Sea-Ice Sheets and Summary of Elastic and Viscoelastic Analyses

Vaudrey, Kennon D.

doi:10.21236/ada051184

Cited by 33 publications

(28 citation statements)

References 3 publications

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“…It must be noted that different loading rates, test temperatures and loading geometries were used and that the previous specimens are probably sub-sized, yielding fracture-toughness values that are too large. The work reported in this study shows a much more pronounced brine-volume dependence than that of Vaudrey (1977), U rabe and others (1980) and Timco and Frederking (1983) on columnar ice. However, a significant aspect of the analysis is that the tests were performed on warm granular ice where the crack-propagation direction was vertical downwards, i.e.…”

Section: Discussioncontrasting

confidence: 46%

Fracture toughness and crack growth of brackish ice using chevron-notched specimens

Stehn

1994

J. Glaciol.

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ABSTRACT. Field-test equipment called FIFT (a Field Instrument for Fracture toughness Tests on ice) was used in both field and laboratory fracture-toughness tests on brackish sea ice from the Gulf of Bothnia. An experimental calibration was performed and a compliance expression was then derived for the Short Rod Chevron Notched (SRCN) specimen . Using the SRCN configuration, for which the initial crack growth is shown to be stable, and measured load-point displacements, preliminary crack-growth velocities are found. The obtained estimated crack velocity is, on average, lie = 20 m S-I, albeit with a large standard deviation. The results indicate that critical crack (crack-jumping) growth occurs. The apparent fracture toughness, KQ, was found to have a pronounced dependency on porosity in the form of brine volume. The results obtained are derived from a linearly elastic fracture mechanics (LEFM) theory. Consequently, the tests were designed to satisfy smallscale yielding requirements in terms of notch sensitivity and brittleness. The linearity of the load vs crack-opening displacement curves together with a size-effect study, showing that the specimen is notch-sensitive for grain-sizes ranging from 1.6 to nearly 100 mm, indicate that LEFM could be applicable.

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Section: Discussioncontrasting

confidence: 46%

Fracture toughness and crack growth of brackish ice using chevron-notched specimens

Stehn

1994

J. Glaciol.

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“…For a purely brittle solid, G is twice the surface energy (7') of the solid. To date, there have been a number of investigations of the fracture toughness of freshwater ice (Gold, 1963;Goodman and Tabor, 1978;Hamza and Muggeridge, 1979;Liu and Miller, 1979;Goodman, 1980;Miller, 1980) but only a few for sea ice (Vaudrey, 1977;Urabe et al, 1980;Yoshitake, 1981a, 1981b). The results of the freshwater ice tests indicate that the fracture toughness decreases with increasing loading rate, increasing temperature and decreasing grain size.…”

Section: Fracture Toughness Of the Icementioning

confidence: 99%

Flexural strength and fracture toughness of sea ice

Timco

Frederking

1983

Cold Regions Science and Technology

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur.Cold Regions Science and Technology, 8, 1, pp. 35-41, 1983-08 Flexural strength and fracture toughness of sea ice Timco, G. W.; Frederking, R. M. W. On a effectu'e au milieu de l'hiver des exp'eriences sur la rssistance 3 la flexion et 3 la rupture de la glace qui se trouvait dans des champs de dgbris autour de l'lle de Tarsiut dans la mer de Beaufort. Les essais comprenaient la d'etermination de la structure des cristaux, de la salinit'e et de la ABSTRACTA series of mid-winter experiments were carneed out on the ice in the rubble field around Tarsiut Island in the Beaufort Sea. The tests included grain structure deteminations, salinity and density of the ice, small beam flexural strength and fracture toughness. Qpical values for flexural strength and fracture toughness were 0.6-1.0 MPa and 100-140 kPa m1I2 respectively. Both properties were dependent on brine volume and depth in the ice sheet. In comparing these results with identical tests on finegrained freshwater ice it was found that for comparable loading conditions, the strength of the sea ice was significantly lower than the strength of the freshwater ice, whereas the fracture toughness of the sea ice was higher than the fiacture toughness of the freshwater ice.

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“…Although creep has been examined in bending and in uniaxial tension and compression using both in situ field and laboratory specimens of first-year sea ice [Tabata, 1958;Vaudrey, 1977;Sinha et al, 1992; RichterMenge and Cox, 1995], it is not thoroughly understood. Additionally, since many previous efforts were too extensive for detailed microstructural characterization of individual specimens, there is a paucity of experimental data for verifying physically based constirutire models that incorporate the effects of alignment.…”

Section: Introductionmentioning

confidence: 99%

Cyclic loading and creep response of aligned first‐year sea ice

Cole¹,

Johnson²,

Durell³

1998

J. Geophys. Res.

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Abstract. Characteristics such as brine and gas porosity and crystallographic features can have a profound impact on the mechanical properties of first-year sea ice. These characteristics vary spatially and temporally, and it is important in the development of constitutive models to address their variability in physically meaningful terms. A program of laboratory experiments on field cores of first-year sea ice has been conducted to aid in the development of such models. A thorough assessment of the bulk physical properties and microstructural characteristics of the ice has been carried out in conjunction with a detailed set of cyclic loading and creep experiments. Methodology was developed to calculate an orientation factor that determines the average shear stress resolved on the basal planes, given the background normal stress. Examination of the constitutive behavior using laboratory cyclic loading and constant load creep experiments revealed that the elastic, anelastic (time-dependent recoverable), and viscous strains varied systematically with the orientation factor. The observations also indicate significant brine porosity effects on the elastic, anelastic, and viscous components of strain. A recently developed constitutive model was expanded to include a frequency-and orientation-dependent viscous straining term, and the model predictions agreed well with the experimental observation.

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Ice Engineering - study of Related Properties of Floating Sea-Ice Sheets and Summary of Elastic and Viscoelastic Analyses

Cited by 33 publications

References 3 publications

Fracture toughness and crack growth of brackish ice using chevron-notched specimens

Fracture toughness and crack growth of brackish ice using chevron-notched specimens

Flexural strength and fracture toughness of sea ice

Cyclic loading and creep response of aligned first‐year sea ice

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