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Aging-induced dynamics for statically indeterminate systems
Jr-Jiun Lin1, Chi-Chun Cheng1, Yu-Chuan Cheng1
1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China.
Abstract:
Statically indeterminate systems are experimentally demonstrated to be in fact dynamical. Take the classic problems of a beam with three supporting points, granules in a silo, and a ladder leaning against a wall, for instance; their reaction forces are found to vary logarithmically for over 10^{4}s with an increment or decrement of more than 10%. This seemingly contradictory mixture of dynamics for a static system is shown to derive from the evolution of microcontact area with the ground and/or wall due to the aging effect.
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