Static Friction of Agar Gels : Formation of Contact Junctions at Frictional Interface(Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics and Fluid Mechanics)

概要

論文の詳細を見る
We measure the static friction F_c of agar gels on glass substrates immersed in water. F_c is independent of the nominal contact area, and increases with the normal load and the duration t_w of contact prior to sliding. Using a confocal laser-scanning microscope, many fine dark spots are clearly visible in the optical reflection distribution images on the glass interface in contact with the gel. The total area of the dark spots increases with t_w, corresponding qualitatively to that of F_c. These observations indicate that F_c originates from the formation of the contacting spots at the interface, which is not due to asperities of the gel surface alone but related to the drainage of water trapped by the gel polymer network at the frictional interface.
社団法人日本物理学会の論文
2005-11-15