講演者:Valentin Popov 氏(Berlin University of Technology) 日時:6月 11日(金) 午後4時30分から 場所: 青山学院大学 理工学部(相模原キャンパス)L棟6階 L603室 題目: 「Accelerating creep as a precursor of stick-slip-instabilities and prediction of "earthquakes" in a laboratory model」 要旨:  A simple tribological system consisting of a metallic specimen pulled by means of a soft spring on a metallic substrate has been studied experimentally. The position of the sliding body as a function of time has been measured with a high resolution of 8 nm. The motion of the sample has a pronounced stick-slip-character, however, during the entire “stick” phase, there is a slow creeping motion which quickly accelerates near the “slip” phase. We have shown that the entire movement of the specimen including both the accelerating creep and the rapid slip can be very good described using the rate and state dependent friction law by Dieterich. The last part of creeping motion immediately preceding the instability has a universal character and allows to predict with high precision the moment of the slip-instability. Generalizations to multi-body systems are discussed. ---------------------------------