Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
An estimate of the size of the damage zone beneath an indenter on ice
AbstractA Vickers indenter loaded with a range of loads from 88 to 1189 N was used on fine grained columnar freshwater ice at −15°C. The length of the resulting cracks, contact diagonal, and the size of the smallest crushed pieces were recorded. The size of the microcrack damaged zone was estimated using these experimental results and a previously obtained arrest stress intensity factor of ice. The microcracked damaged zone is shown to be much smaller than a plastically damaged zone. The range of the lower limit to the piece size was consistent with calculated values. This is taken as evidence that an inelastic energy absorption mechanism other than pressure melting may be activated. Plasticity in the microcrack damaged zone is activated only in very small fragments. The extensive microcracking is the reason for the much smaller damage zone. This mechanism of plastic flow in only small fragments may be involved in the scale dependence of fragmentation processes indicated by a non-constant fractal ice capacity dimension.
An estimate of the size of the damage zone beneath an indenter on ice
AbstractA Vickers indenter loaded with a range of loads from 88 to 1189 N was used on fine grained columnar freshwater ice at −15°C. The length of the resulting cracks, contact diagonal, and the size of the smallest crushed pieces were recorded. The size of the microcrack damaged zone was estimated using these experimental results and a previously obtained arrest stress intensity factor of ice. The microcracked damaged zone is shown to be much smaller than a plastically damaged zone. The range of the lower limit to the piece size was consistent with calculated values. This is taken as evidence that an inelastic energy absorption mechanism other than pressure melting may be activated. Plasticity in the microcrack damaged zone is activated only in very small fragments. The extensive microcracking is the reason for the much smaller damage zone. This mechanism of plastic flow in only small fragments may be involved in the scale dependence of fragmentation processes indicated by a non-constant fractal ice capacity dimension.
An estimate of the size of the damage zone beneath an indenter on ice
Parsons, B.L. (Autor:in)
Cold Regions, Science and Technology ; 21 ; 371-380
20.09.1992
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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