Author(s): S. Tozawa; T. Kawasaki; Y. . Taguchi
Linked Author(s):
Keywords: No Keywords
Abstract: Laboratory indentation tests against an ice sheet were carried out aiming at understanding of the size effect which ice pressures present as the remarkable characteristics. The experiments were performed by using the cylindrical models which differ in diameter and the rectangular indenter where load measuring panels are filled in. From these experiments the data set in the range of contact area 10-3 to 10-1 m2 were obtained, and the size effect that local ice pressures decrease with increase in the area was recognized even within the limits of this experiment in the small area range. Moreover, a simple mechanical argument based on non-simultaneous failure concept derived by Ashby and others appears to be promising to explain the size effect. However, it is found that no single phenomenon can account for local ice pressure reduction over a wide range of contact area, because various failure modes may occur depending on some effects of width or aspect ratio. The pressure-area curve needs to be established for the corresponding failure mode.
Year: 1990