Author(s): T. Takeuchi; S. Kioka
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Keywords: No Keywords
Abstract: There are high pressure zones (hpz) mainly inside a line-like contact zone at the interface between ice sheet and structure in the brittle condition, and these form and fade rapidly for a certain size and pressure. These zones were observed through pressure data obtained by a tactile sensor in medium scale field indentation tests of JOIA projects (Takeuchi et. al., 2004). High pressure zones play an important role in global force and relate to non-simultaneous stress transmission to structures in the brittle condition. A "abeling process" of image processing was newly applied to tactile sensor data, which allows us to find a zone that has adjacent grid pressures. Area, pressure and location of a high pressure zone were extracted at each frame (image) of tactile sensor data through a threshold that was mainly taken as a uni-axial compressive strength. In terms of each high pressure zone, area, force, distances in x- and y- direction, acting position and distance (dXL), between adjacent acting positions were estimated. Especially, the probability density function for an area normalized by the square of ice thickness and distance (dXL) normalized by ice thickness is log-normal type. In addition, these findings allow us to generate forces over the width of the structure.
Year: 2012