Crack-fabrication techniques and their effects on the fracture toughness and CTOD for fresh-water columnar ice

Wei, Yingchang; DeFranco, Samuel J.; Dempsey, J. P.

doi:10.3189/s0022143000007280

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…The average fracture toughness, K Ic_ave , for pure ice in this study was 99.8 kPa m 1/2 . This value is close to those of freshwater ice obtained in previous studies at À10°C [Timco and Frederking, 1986;Nixon and Schulson, 1987;Wei et al, 1991] and serves as a validation of the procedure we used. As expected for a heterogeneous material, the values of K Ic for each silica ice vary more than the fracture toughness of pure ice, yet the data shows clearly that K Ic Figure 5.…”

Section: Peak Compressive Stresssupporting

confidence: 87%

Experimental studies on mechanical properties and ductile‐to‐brittle transition of ice‐silica mixtures: Young's modulus, compressive strength, and fracture toughness

2017

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We measured Young's modulus, fracture toughness, and compressive strength of ice and of ice‐0.25‐μm hard silica bead mixtures in controlled systematic experiments to determine the effect of silica on the ductile‐to‐brittle transition. Unconfined compressive strength was measured in a cold room at −10°C under a constant strain rate ranging from 10−5 to 6 × 10−1 s−1 of mixtures with silica volume fraction f of 0, 0.06, and 0.18. In the brittle regime, the compressive strength σpeak was a maximum at the transitional strain rate and then decreased with increasing strain rate. In the ductile regime, the σpeak increased exponentially with increasing strain rate trueε˙ as trueε˙=B∙σpeakn. The stress exponent n for f = 0.06 and 0.18 was ~6, twice as large as the value of pure ice, n ~ 3. The transitional strain rate increased with increasing silica volume fraction; 10−3–10−2 s−1 for pure ice, 10−2–10−1 s−1 for f = 0.06, and >6 × 10−1 s−1 for f = 0.18. Fracture toughness and Young's modulus were measured over the range 0 ≤ f ≤ 0.34. Fracture toughness scaled as f0.5, while Young's modulus increased linearly with f. Finally, a theoretical model of the transitional strain rate proposed by Schulson (1990) and Renshaw and Schulson (2001) was compared to the measured transitional strain rates. Model predictions were in accord with measured transitional strain rates for pure ice but somewhat higher than observed for ice‐silica mixtures. Large model uncertainty was due to high sensitivity of the transitional strain rate to the stress exponent n.

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Section: Peak Compressive Stresssupporting

confidence: 87%

Experimental studies on mechanical properties and ductile‐to‐brittle transition of ice‐silica mixtures: Young's modulus, compressive strength, and fracture toughness

2017

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“…Thus, it is experientially challenging to measure fracture toughness. There exist different techniques to measure the Mode I fracture toughness of a material such as three-and four-point loaded beams with a notch, for example see Goodman and Tabor (1978), Timco and Frederking (1982), Wei et al (1991), Weber and Nixon (1996a) and Weber and Nixon (1996b) for sea water and fresh water ice. Furthermore, different parameters, which have an influence on the critical fracture toughness are analysed in Nixon and Schulson (1987), Nixon (1988) and Nixon and Schulson (1988) for tensile bars with a circulatory notch.…”

Section: Introductionmentioning

confidence: 99%

Measurement of fracture toughness of an ice core from Antarctica

Christmann¹,

Müller²,

Webber³

et al. 2014

Preprint

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Abstract. The critical fracture toughness is a material parameter describing the resistance of a cracked body to further crack extension. It is an important parameter to simulate and predict the break-up behaviour of ice shelves from calving of single icebergs to the disintegration of entire ice shelves over a wide range of length scales. The fracture toughness values are calculated with equations that are derived from an elastic stress analysis. Additionally, an X-ray computer tomography (CT scanner) was used to identify the density as a function of depth. The critical fracture toughness of 91 Antarctic inland ice samples with densities between 840 to 870 kg m−3 has been determined by applying a four-point-bending technique on single edge v-notched beam samples. The examined ice core was drilled 70 m north of Kohnen Station, Dronnning Maud Land (75°00' S, 00°04' E, 2882 m). Supplementary data are available at doi:10.1594/PANGAEA.835321.

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Thickness-independent fracture in columnar freshwater ice: An experimental study

Gharamti,

Ahmad,

Puolakka

et al. 2024

Engineering Fracture Mechanics

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Crack-fabrication techniques and their effects on the fracture toughness and CTOD for fresh-water columnar ice

Cited by 5 publications

References 18 publications

Experimental studies on mechanical properties and ductile‐to‐brittle transition of ice‐silica mixtures: Young's modulus, compressive strength, and fracture toughness

Experimental studies on mechanical properties and ductile‐to‐brittle transition of ice‐silica mixtures: Young's modulus, compressive strength, and fracture toughness

Measurement of fracture toughness of an ice core from Antarctica

Thickness-independent fracture in columnar freshwater ice: An experimental study

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