Fractographic examinations of fracture in polycrystalline S2 ice

Wei, Yingchang; Dempsey, J. P.

doi:10.1007/bf01130109

Cited by 11 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because this implies some nonelastic deformation, the elastic nature of the rising part of the stress-strain curve was verified by placing strain transducers directly on the ice surface which produced a measured elastic modulus of 8.9 GPa, very close to the dynamic elastic modulus for ice. 7 The macroscopic fracture surfaces were typical of those for cleavage fracture in brittle polycrystalline materials such as ice: 8 stepped cleavage surfaces forming a radiating pattern indicative of the nucleation center of the fracture. A large number of small "feather" fractures, over 10 mm long in places and just visible in Figure 1a, formed at right angles to the main X Abstract published in AdVance ACS Abstracts, August 1, 1997. basal plane fracture.…”

Section: Single-crystal Fracturementioning

confidence: 94%

“…It was not possible to distinguish a third cleavage direction on pyramidal planes as observed elsewhere. 8,9 For test 3 small traces of recrystallization, visible under cross-polarized light, were associated with lines of fine gouge and cracking. However, in the case of test 9, almost the entire surface of one of the fracture faces displayed extensive recrystallization, not associated with gouge or other visible damage, penetrating some 2-3 mm into the fractured surface in places.…”

Section: Single-crystal Fracturementioning

confidence: 99%

See 1 more Smart Citation

High-Stress Ice Fracture and Friction

Rist

1997

J. Phys. Chem. B

View full text Add to dashboard Cite

The fracture and friction of ice have been examined under triaxial compression at rates and temperatures for which the deformation behavior is predominantly brittle−elastic. Strength is limited by rapid, unstable fracture which occurs along cleavage planes that experience the highest resolved shear stress in the case of single crystals and in the direction of maximum bulk shear stress for polycrystals. Fracture propagation is possibly associated with the onset of plastic slip or yielding in both cases. Polycrystalline ice frictional sliding at high rates and/or low temperatures appears to be the result of elastically deforming asperities that undergo shear failure. A well-defined frictional law is apparent in which (shear stress) ∝ (normal stress)2/3, independent of temperature, surface roughness, and sliding rate, provided deformation remains elastic.

show abstract

Section: Single-crystal Fracturementioning

confidence: 94%

Section: Single-crystal Fracturementioning

confidence: 99%

High-Stress Ice Fracture and Friction

Rist

1997

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

“…The surface was fairly smooth with lines, perpendicular to the crack propagation direction, extending over the whole width of the notch. These lines represent crack arrest/initiation lines and by correlating the marks on the specimen surface [29]. Fractographic examinations were then conducted on the replica where the crack arrest/initiation lines could be identified by a distinct line from where river patterns extended.…”

Section: Methodsmentioning

confidence: 99%

Fracture resistance determination of freshwater ice using a chevron notched tension specimen

Stehn

DeFranco²,

Dempsey

1994

Int J Fract

Self Cite

View full text Add to dashboard Cite

Crack growth resistance (R-curve behavior) measurements on large grained S 1 type freshwater ice were conducted in the Ice Mechanics Research Laboratory at Clarkson University. To overcome previous difficulties in obtaining stable cracking in freshwater ice, a new crack geometry was developed. The short rod Chevron Notched Tension (CNT) specimen was found to be extremely favorable in the sense of promoting stable, stick-slip, crack growth over a large portion of the uncracked ligament. A negative fracture resistance KR-curve was evaluated for this ice at -16°C.

show abstract

“…They are: internal energy sources, surface energy of grain boundaries, intragranular lattice defect energy and elastic energy due to external loading. Meglis et al (1999), Passchier and Trouw (2005) and Wei and Dempsey (1991) have further investigated the influence of dynamic recrystallization with the influence of the creeping effect, pressure melting and kinking mechanisms.…”

Section: Dynamic Recrystallizationmentioning

confidence: 99%